MERITHEW, INC.
INSPECTION SERVICES
P.O. BOX 177
RAYNHAM CENTER, MASSACHUSETTS 02768
POTABLE WATER AND OIL STORAGE TANK INSPECTION
DRY / WET / REMOTE EVALUATIONS
CLEANING / PAINTING INSPECTION – CODE COMPLIANCE
THE LOCKE RD
250,000 GALLON ELEVATED TANK
CHELMSFORD, MASSACHUSETTS
DECEMBER 2, 2008
INFO@MERITHEWINC.COM
TELEPHONE (508) 279-9965
FAX (508) 279-9948
WWW.MERITHEWINC.COM
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TABLE OF CONTENTS
QUALITY OF SERVICES....................................................................................................................... 3
TANK DATA ............................................................................................................................................. 4
SUMMARY................................................................................................................................................ 5
EXTERIOR SURFACES ........................................................................................................................ 5
INTERIOR SURFACES ......................................................................................................................... 6
STRUCTURAL....................................................................................................................................... 7
SITE ........................................................................................................................................................ 9
RECOMMENDATIONS ........................................................................................................................ 10
INSPECTION DATA - EXTERIOR ..................................................................................................... 11
EXTERIOR ROOF................................................................................................................................ 11
EXTERIOR SHELL & BALCONY...................................................................................................... 16
EXTERIOR BOWL & RISER .............................................................................................................. 21
EXTERIOR SUPPORT STRUCTURE ................................................................................................ 25
EXTERIOR FOUNDATION & ATTACHMENTS ............................................................................. 28
INSPECTION DATA - INTERIOR ...................................................................................................... 30
INTERIOR ROOF................................................................................................................................. 30
INTERIOR SHELL ............................................................................................................................... 33
INTERIOR BOWL & RISER ............................................................................................................... 35
APPENDICES ......................................................................................................................................... 38
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QUALITY OF SERVICES
April 15, 2009
Dear Mr Delaney,
Enclosed is the inspection report for the above referenced project. This report contains summary data
for the tank, a description of the project background, procedures used, the detailed findings of the
inspection and the recommendations associated with those findings. In addition, detailed measurement
data, additional photographs and narrated video of the inspection are included, if applicable. The report
is comprised of the visual observations made during an inspection as well as information obtained from
utility personnel, the tank information plate as well as any additional reports, diagrams or other materials
provided.
The information contained herein is as accurate as could be obtained by Merithew, Inc personnel at the
time of the inspection. No other assurance or warranty is expressed or implied. We assume no
responsibility for any errors or omissions in this report, but will attempt to resolve concerns with the
content of this report upon request.
Any estimates or opinions with respect to tank rehabilitation provided by Merithew, Inc in this report are
based on Merithew’s experience and qualifications as a consultant and represent its best judgment as an
experienced and qualified consultant familiar with the construction industry. Since Merithew, Inc. has
no control over costs of labor, materials, equipment or services furnished by others or over competitive
bidding or market conditions, it cannot guarantee that proposals, bids or actual project costs or
construction costs will not vary from any estimates or opinions of costs prepared by Merithew, Inc.
Since the condition of the storage facility will change over time, the accuracy of the condition of the
storage facility described herein will decrease with time. This report can no longer be considered
accurate when the date for re-evaluation specified in the recommendations has been reached. The
storage facility should be re-inspected to determine the current conditions at that time.
Thank you for your attention in this matter.
Sincerely,
Merithew, Inc.
David L. Merithew, President
DLM/elm
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TANK DATA
TANK NAME: The Locke Rd 250,000 Gallon Elevated Tank
DATE: December 2, 2008
INSPECTED BY: Ken Lunetta & Chad Merithew
PREPARED FOR:
Mr. Bob Delaney
Chelmsford Water District
20 Watershed Lane
Chelmsford, MA 01824-4884
TANK LOCATION:
Street: Locke Rd
City: Chelmsford
State: MA
TANK SIZE:
Diameter: 40’±
Shell Height: 20’±
Capacity: 250,000 gallons
Height to Bottom: 40’±
Height to Overflow: 70’±
CONSTRUCTION:
Type of Tank: Riveted elevated w/ partially welded riser
Columns: Six boxed lattice leg columns.
Number of Tower Panels: Two.
Type of Bottom: Ellipsoidal.
Type of Roof: Cone.
Type of Foundation: Concrete footings.
Cathodic Protection: None.
Grounded: No separate grounding straps evident.
FAA Lights: No obstruction lighting present or required.
DATE CONSTRUCTED: 1940
DATE LAST PAINTED:
BY: Horton Tank/CBI
Exterior: N/A
Interior: N/A
DATE LAST INSPECTED: Interior: 2003
Aerial Photograph from MS Virtual Earth
CONTRACT NO:
Paint System: Alkyd
Paint System: Vinyl
Exterior: 2003
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SUMMARY
EXTERIOR SURFACES
The coatings on the exterior roof are in fair condition, with the exception of widespread delamination of
the top coats throughout 8-10% of the observed surfaces. The majority of the observed delamination
extends to an intact primer coat of paint, but exposed substrate was also noted along 3% of the roof plate
surfaces and has resulted in medium to heavy corrosion. In addition, coating failure was observed along
the majority of all roof plate lap seams resulting in medium to heavy corrosion and some rust scale
build-up emanating from the lap seam junctions. Rust build-up has also resulted in deformation of the
roof plates between rivets and the formation of gaps along the seams in localized areas. Extensive
corrosion has also resulted in metal fatigue along the outer roof to shell perimeter bolted connections,
with penetrations through the roof plates also found in these areas.
The protective coatings on the upper shell rings appear to be in fair to good condition, with the exception
of scattered cracking and localized delamination of the top coats. The most extensive failure beyond the
top coats was noted adjacent to the antenna mounting brackets, likely due to improper surface
preparation following their installation. Evidence of slightly greater coating breakdown to the substrate
was also evident along scattered sections of the top shell rim angle, lap seams and rivet heads. These
areas are now exhibiting medium to heavy corrosion, but no significant metal loss was noted.
The protective coatings along the balcony and handrail system are in fair to poor condition, with the
majority of the coatings only providing minimal protection to the underlying substrate surfaces.
Extensive checking and cracking of the existing coatings throughout the top face of the balcony walkway
has resulted in failure to the primer or substrate along at least 30-40% of the observed surfaces.
Localized areas of complete coating failure, often associated with areas of prolonged water retention, are
now experiencing medium to heavy corrosion and an aggressive surface profile. The coatings on the
inner shell to walkway rim angle as well as the outer walkway support beam are in poor to fair condition,
with widespread coating failure and medium surface corrosion throughout. The underside of the
walkway surface is in better condition, but checking of the coating was evident and light rust bloom is
breaking through the coatings in some areas. The balcony handrail system is also exhibiting widespread
cracking and delamination of the existing coatings, particularly along the top horizontal face of the
handrail as well as leading edges of the vertical stanchions and cross-bracing. Areas of heavy rust
formation were also noted along the localized areas of the kick plate junction with the walkway surface
as well as connections between the cross-bracing and the vertical face of the kick plate.
The coatings on the underside of the bowl are in fair condition, with the exception of scattered cracking,
peeling and delamination of the coatings primarily along the rivet heads and lap seams. Seam junctions
and exposed substrate surfaces are now experiencing medium to heavy rust along an estimated 15% of
the lap seams and rivet heads, while much less light to medium rust was observed along the bowl plates
themselves.
The protective coatings on the exterior riser are in poor to fair condition, with widespread checking and
cracking to the substrate resulting in light to medium corrosion. More significant corrosion was noted
along the one set of rivet heads connecting the second to third cylinder sections of the riser pipe. This
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area has experienced leakage in the past and was subsequently repaired, with no active leakage occurring
at this time.
The coatings along the exterior faces of the leg columns and horizontal struts are in generally very good
condition with less than 2% of the referenced surfaces exhibiting failure to the steel substrate. The
inboard surfaces of the leg columns as well as localized areas of the struts were exhibiting a significantly
greater degree of coating failure primarily in the form of localized areas of cracking and delamination,
both of which extend back to base coat of primer and/or the steel substrate. This deterioration has
resulted in medium to heavy rust formation as well as the exposure of mill scale. The presence of mill
scale would suggest that not all surfaces have been abrasive blast cleaned to bare metal since the subject
tank was built. Furthermore, there was evidence of past coating applications suggesting that not
previous coatings were removed during the last several maintenance operations. The coatings along the
sway rods are in fair to poor condition with at least 25-30% of the referenced surfaces already exhibiting
failure to the substrate and medium to heavy rusting. The coatings along the sway rod turnbuckles,
yokes and retention pins are also exhibiting scattered coating failure however to a much lesser degree
than what was observed along the rods themselves. The radial rods spanning from the leg columns to
the riser pipe were found to be in poor condition with at least 60% of these surfaces exhibiting failure to
the substrate and subsequent rust formation.
The coatings along the remaining exterior attachments are exhibiting varying degrees of degradation and
rust formation as further detailed within this report.
Analysis of lead content in samples of the exterior coating revealed a measurement as high as 280,000
mg/Kg indicating the coatings are lead bearing and appropriate containment and disposal methodologies
will be required.
INTERIOR SURFACES
The coatings along the interior surfaces of the subject are in generally poor condition with extensive
failure observed along the underside of the roof, roof to shell rim angle, bottom shell ring, bowl and riser
as further detailed within this report. This failure has resulted in extensive corrosion and evidence of
significant metal loss at least along roof lap seams, roof to shell angle, bowl and riser. In fact the extent
of both past and current metal loss would suggest the possibility of replacing the entire riser if the
subject tank was to be rehabilitated.
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STRUCTURAL
The structural integrity of the subject tank and its attachments is questionable, furthermore there are
significant compromises in the roof, the finial vent and overflow pipe which could jeopardize the
sanitary condition of the water chamber. In order to ensure the continued sanitary condition of the tank
and maintain the safety structural integrity of the tank for more than an additional year or two
consideration should be given to performing the following repairs.
Exterior:
1. Heavy corrosion and rust scale formation has resulted in localized areas of deformation between
rivets along the roof plate lap seams. This deterioration has caused gaps to form between roof
plates and contributed to severe metal fatigue or complete loss of scattered lap seam rivets.
Overall, it is estimated that 14 rivets are missing and (3) linear feet of open gap, each at least 2”
in length, are present along the roof plate lap seams. At least 37 of the roof perimeter bolted
connections are experiencing a 25% or more reduction in dimensional size of the retention nut
and one bolt is missing. At least (6) penetrations were identified through the roof plates at the
roof to shell junction, with other areas of potential breakthrough also noted. These areas will
require plating or weld repairs during any future maintenance operations. The remaining roof lap
seams have been severely compromised along a number of areas due to the build-up of stratified
rust and loss of rivets as previously referenced. It is currently estimated that at least 70-90 linear
feet of roof seam would also have to be cleaned of all stratified rust, re-fit and welded with
additional areas caulked to ensure the seams will not allow rain runoff to enter the water
chamber.
2. The finial ball at the center of the roof appears to be intact and structurally sound; however there
are no screens in the openings and the base of the stub and the bolted connections are exhibiting
heavy corrosion and some structural fatigue. During the next scheduled maintenance operations,
consideration should be given to permanently affixing the access ladder to the roof surface and
replacing the finial ball with a more effective venting assembly.
3. The overflow pipe stub in the top shell ring appears to be functional at this time, but two of the
bolted connections that secure the assembly in place are beginning to protrude along the exterior.
Furthermore inspection of the inside face of the overflow connection suggests that the interior
overflow funnel is pulling away from the shell, most likely the result of failure of the bolted
connections. This item should be repaired by either installing new retention bolts or welding the
(2) pieces into place. Consideration should also be given to extending the overflow pipe to
within 18” of ground level then fitting the opening with a bolting flange in which screening and a
flapper assembly can be installed.
4. There are a series of L-angle brackets bolted to the balcony walkway surface which were used at
one time to secure antenna cables. The majority of these cable brackets are no longer in use and
should be removed for safety reasons.
5. There are (5) anchor bolt retention nuts are exhibiting up to a 30% + reduction in size and should
be replaced as soon as feasible to do so.
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6. (3) of the leg column footings as well as 50% of the riser footing are experiencing substantial soil
and vegetation encroachment. The surrounding vegetation and soil should be excavated back
sufficiently so as to expose at least the top 3-4” of the footings. This will help promote drainage
away from the base of the leg columns and riser and help retard any aggressive degradation of the
leg column base plates, base of the riser and/or the top of the footings.
Interior:
1. There is evidence of substantial stratified rust formation along localized areas of the roof to shell
rim angle suggesting the probability of extensive metal loss of affected surfaces. It is anticipated
that significant welding repairs if not sectional replacement would be required along this area if
the tank was to be rehabilitated.
2. The roof support structure appears to be intact and structurally sound at this time however, there
is evidence of slight metal loss taking place along the rafter ends and shell support brackets.
There is also significant metal loss along as many as (12) retention nuts with as much as 75% of
the nuts completely corroded away. All brackets and/or retention nuts exhibiting a 35% or
greater reduction in size should be replaced or welded into place.
3. The spider center hub and rods appear to be intact at this time however; there is evidence of both
past and current metal loss taking place along the majority of all surfaces. The spider assembly
should be considered unsafe for access and/or rigging and consideration given to replacing the
assembly in its entirety.
4. The shell and bowl surfaces are exhibiting scattered medium to large rust tubercles which
suggest the potential for pitting. There is also evidence of a significant degree of past metal loss
primarily in the form of a generalized pitting along all shell surfaces. If the subject tank is to
remain in active service for any extended period of time then consideration should be given to fill
welding all pits representing a 35% of greater degree of metal loss of the corresponding plate
thickness and seal welding any rivets exhibiting greater than a 50% loss of head dimension or
exposure of the shank or rivet hole. Any pitting less than the designated 35% but more than 20%
loss should be filler with a 100% solids epoxy material to help ensure the continuity of the
coatings to be applied. All rivets and lap seams from the high water level down should also be
sealed with an NSF approved modified polyurethane material after all interior surfaces have been
abrasive blast cleaned and coated.
5. Due to the extensive metal loss from both past and current corrosion consideration should be
given to replacing the entire riser assembly with a new welded steel pipe riser if it is determined
that the tank is to remain in active service for an extended period of time.
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SITE
The subject tank is located in a residential neighborhood, with numerous homes within 150’ of the tank
site. Additional homes are also located beyond a tree line behind the tank, and may also be impacted
during any future maintenance operations. Access to the tank is gained from a short horseshoe-shaped
gravel access road with a small parking area present between the tank security fence and a small utility
building on site.
The immediate tank site is enclosed within a chain-link fence topped by barbed wire. There is a single
gate opening to the access road allowing for entry of most equipment and small vehicles.
The security fence passes within 5’ of each of the leg columns; therefore it may need to be removed in
order to accommodate specific types of containment. In addition to the previously mentioned security
building, there is also a telecommunications building and equipment immediately outside the security
fence as well as an additional fenced enclosure, small utility building and propane tank adjacent to the
riser beneath the tank. The small fenced enclosure protects three utility boxes connected or adjacent to
the base of the riser.
Other miscellaneous cables and wires connect to the leg columns and span along the underside of the
tank, which will need to be removed during any future maintenance operations.
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RECOMMENDATIONS
The subject tank is in dire need of complete rehabilitation which would include complete abrasive blast
cleaning of all exterior and interior surfaces, full encapsulation of the entire structure during this process
to capture all lead based paint and abrasive blasting debris, as well as extensive modifications and
welding repairs as outlined in the “Structural” section of this report. The estimated cost for this work as
outlined would be Five Hundred Thirty-Six Thousand ($536,000.00). However be advised that abrasive
blast cleaning of the interior and exterior surfaces of the subject tank may reveal a greater degree of
structural repairs than is currently anticipated, which could have a significant impact to the overall cost
of rehabilitation. Furthermore, the cost for rehabilitation should be weighed heavily against the cost for
a new tank which would allow for a much greater service life as well as the ability to address any and all
concerns regarding additional capacity and/or pressure needs. A new tank would also allow for the
design of a substantially more maintenance friendly design which would allow increased service of the
applied coatings, increased maintenance cycle and overall reduction in future maintenance costs.
If you elect to proceed with the rehabilitation of the subject tank we can provide a more comprehensive
scope of work for the rehabilitation of the tank.
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INSPECTION DATA - EXTERIOR
EXTERIOR ROOF
Roof plates:
General condition of coating: The coatings on the
exterior roof are in fair condition, with the exception of
widespread delamination of the top coats throughout 8-10%
of the observed surfaces. The majority of the observed
delamination extends to an intact primer coat of paint, but
exposed steel substrate was noted along 3% of the roof
plate surfaces and has resulted in medium to heavy
corrosion and rust staining, as shown in photograph #1. In
addition, coating failure was observed along the majority of
all roof plate lap seams resulting in medium to heavy
corrosion and some rust scale build-up emanating from the
lap seam junctions. Rust build-up has also resulted in
deformation of the roof plates between rivets and the
formation of gaps along the seams in localized areas.
Extensive corrosion has also resulted in metal fatigue along
the outer roof to shell perimeter bolted connections, with
penetrations through the roof plates also found in these
areas.
Degree of rusting: Medium to heavy corrosion was
scattered along 3% of the roof plates and observed along
the majority of all roof plate lap seams. Rust scale build-up
has resulted in structural fatigue in localized areas of the lap
seams, as illustrated in photograph #2. Additional heavy
corrosion is also affecting scattered rivet heads and roof
perimeter bolted connections.
Photograph #1
Photograph #2
Condition of metal: Heavy corrosion and rust scale
formation has resulted in localized areas of deformation
between rivets along the roof plate lap seams. This
deterioration has caused gaps to form between roof plates
and contributed to severe metal fatigue or complete loss of
scattered lap seam rivets. Overall, it is estimated that 14
rivets are missing and 3 linear feet of significant gap, each
at least 2” in length, are present along the roof plate lap
seams. Minimal correction would require at least 60 linear
feet of caulking to be applied to seal separations in the lap
seams. At least 37 of the roof perimeter bolted connections
are experiencing a 25% or more reduction in dimensional
Photograph #3
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size of the retention nut, as indicated in photograph #3, and
one bolt is missing. At least 6 penetrations were identified
through the roof plates at the roof to shell junction, with
other areas of potential breakthrough also noted. These
areas will require plating or weld repairs during any future
maintenance operations.
Adhesion of coatings: Widespread top coat delamination
along three quarters of the roof, as indicated in photograph
#4, suggests reduced interfacial adhesion along the roof
plate surfaces that has progressed beyond the point of being
simply recoated. Primer to substrate adhesion remains
good along the majority of the roof, and continues to
provide minimal protection from additional rust formation.
Photograph #4
DFT of coatings: 2.2 to 15.4 mils, with an average of 6.17
mils for the readings taken along the exterior roof. Refer to
the attached printout for individual readings.
Roof vent(s):
Type: One center roof finial ball approximately 19” in
overall height, with an approximately 6ӯ stub pipe and
12ӯ base plate bolted to the roof. The ball is equipped
with five 1¾”Ø penetrations, with no screens present. The
base of the finial ball serves as the pivot point for the
revolving roof ladder.
Photograph #5
General condition of coating: The coatings along the
exterior surfaces of the finial ball are in fair to poor
condition, with widespread cracking and areas of
delamination noted as illustrated in photographs #5 and #6.
Breakdown to the primer and steel substrate has resulted in
medium rust formation along 5-8% of the visible surfaces.
Failure of the coating was also noted along the junction of
the finial ball with the roof center cone plates and the stub
pipe where it has been abraded by the roof ladder collar.
The interior of the finial ball does not appear to be coated,
and is exhibiting uniform corrosion throughout the interior.
Extensive rust staining is weeping from the base of the
finial stub indicating progressive rusting along the
underlying surfaces. The bolted connections securing the
base of the finial to the roof plates are also exhibiting
coating delamination to intact primer and areas of
significant rust formation.
Photograph #6
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Degree of rusting: Medium to heavy corrosion was
observed along 5-8% of the exterior finial ball and the
majority of the finial base to roof plate junctions.
Condition of metal: The finial ball itself appears to be
intact and structurally sound, but the base of the stub and
the bolted connections are exhibiting heavy corrosion and
some structural fatigue, as demonstrated in photograph #7.
During the next scheduled maintenance operations,
consideration should be given to permanently affixing the
access ladder to the roof surface and replacing the finial
ball with a more effective venting assembly.
Photograph #7
Condition of screen: No screens are present on the finial
ball penetrations allowing for a potentially unsanitary
condition within the water chamber although pleased be
advised there is no evidence of any compromise at this
time.
Are any repairs required? The penetrations in the finial
ball should be protected as soon as feasible to do so in
order to ensure the sanitary condition of the tank.
Roof ladder and/or handrail:
Is ladder equipped with a cage? No.
Safety climb device: None.
General condition of coating: The coatings on the roof
ladder were found to be in fair to poor condition, with
widespread checking and top coat delamination to intact
primer or exposed steel substrate. Light to medium
corrosion was also observed along 10-15% of the ladder
surfaces, primarily along the ladder rungs and top leading
edges of the side rails as indicated in photograph #8. The
wheel assemblies and pivot collar appear to be in fair
condition, but the presence of numerous cellular antenna
mounts and fixed points at the balcony level prevent any
movement of the revolving ladder.
Photograph #8
Degree of rusting: Light to medium corrosion was noted
along 10-15% of the ladder surfaces.
Condition of metal: Areas of corrosion do not appear to
be resulting in any significant metal loss at this time. As
the assembly can no longer function as a revolving ladder,
it is recommended that the ladder be permanently affixed to
Photograph #9
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the roof plates to improve its structural integrity. The
bolted connections securing the shell ladder to the end of
the roof ladder appear to be intact and structurally sound, as
shown in photograph #9.
Roof access manhole(s):
Type: One 19”×27” tombstone-style roof hatch opening
equipped with a ¾ drip edge and secured by a hinged cover
with downward lap and locking assembly, as shown in
photograph #10.
General condition of coating: The coatings along the
exterior roof hatch are in fair to good condition, with the
same degree of top coat checking and minor top coat
delamination noted. Additional deterioration was noted
along the roof rain guard enclosed within the hatch cover as
well as the hinge assembly. The interior hatch surfaces are
also exhibiting scattered checking and coating
delamination, particularly along the leading edge of the
downward lap.
Photograph #10
Degree of rusting: Minor areas of coating failure have
given way to light to medium corrosion along less than
10% of the total hatch area.
Condition of metal: The roof hatch assembly appears to
be intact and structurally sound, with no significant metal
fatigue observed.
Photograph #11
Are manholes equipped with hasps and padlocks? The
roof hatch was locked at the time of the inspection.
Coaxial cables/Cellular antenna array(s):
Type: A large array anchored by 6 poles that pass through
the roof perimeter overhang and secure to the upper shell
serve as the attachment points for 6 cellular antennas. Two
additional antennas are mounted to another pole that also
passes through the roof overhang and secures to the shell.
An additional 8 whip antennas are mounted on a tripod
tower or an adjacent pole, as indicated in photograph #12,
both extending from the balcony level, or attached to
additional framework on the roof ladder adjacent to the
finial ball.
Photograph #12
15
Cabling: The cables for the cellular antennas extend from
the bases of the mounting poles to the outside of the
balcony. They continue along the outer base of the balcony
to a common leg column, where they are secured with
clamps to a cable tray extending down the full vertical
length. The cables extend from the base of the leg column
to an adjacent utility building via a cable bridge. The whip
antenna cables are bundled together and secured to the side
of the leg column access ladder by wire ties.
General Condition: Holes have been cut in the roof
overhang in order to attach the mounting poles for the roof
framework to the upper shell. The poles themselves are
clamped to bracket assemblies full welded to the top shell
ring, as shown in photograph #13. Coatings on and
adjacent to the bracket assemblies are in poor condition,
with widespread cracking and delamination in progress.
Exposed bracket surfaces appear to be corrosion free, but
the surrounding shell surfaces are experiencing light to
medium rust formation.
Photograph #13
The bracket assemblies and roof framework appear to be
sufficiently offset from the roof and shell surfaces to allow
for affective rehabilitation of the underlying surfaces. The
cables are attached to the outer balcony and the leg
columns, with no clearance between the cables themselves
and the tank surfaces, as demonstrated in photograph #14.
When this tank is next maintained, it will be necessary to
remove all cabling from the balcony and leg columns in
order to properly clean and paint the underlying surfaces.
Rigging attachments: The roof is not equipped with any
rigging attachments other than the center finial ball.
Photograph #14
16
EXTERIOR SHELL & BALCONY
Shell plates:
General condition of coating: The protective coatings on
the upper shell rings appear to be in fair to good condition,
with the exception of scattered cracking and localized
delamination of the top coats. In most areas, this failure
appears to extend to a previous finish coat of paint, as
illustrated in photograph #15. The most extensive failure
beyond the top coats was noted adjacent to the antenna
mounting brackets, likely due to improper surface
preparation following their installation.
Evidence of
slightly greater coating breakdown to the substrate was also
evident along scattered sections of the top shell rim angle,
lap seams and rivet heads as demonstrated in photograph
#16. These areas are now exhibiting medium to heavy
corrosion, but no significant metal loss was noted. The
surfaces are lightly chalked throughout the shell, and the
lower bottom rings have been marked with tape and graffiti,
as indicated in photograph #17.
Photograph #15
Degree of rusting: Medium to heavy corrosion was
scattered throughout less than 3% of the shell plates and
5% of the lap seams and riveted junctions. Additional rust
staining is emanating from corrosion points, particularly
along the roof to shell junction.
Condition of metal: The shell appears to be intact and
structurally sound at this time. Scattered corrosion along
the exterior shell does not appear to be resulting in any
significant metal loss.
Photograph #16
Adhesion of coatings: Scattered areas of cracking and
delamination of the top coat indicates reduced adhesion to
the underlying finish coat of paint. This condition in
combination with the advanced stage of deterioration along
other areas of the tank suggests these surfaces should also
be cleaned to bare metal prior to any future coating
operations.
DFT of coatings: 3.2 to 10.1 mils, with an average of 5.31
mils for the readings taken along the exterior shell. Refer
to the attached printout for individual readings.
Photograph #17
17
Roof to shell eaves:
General condition of coating: The coatings on the top
shell rim angle and underside of the roof overhang are in
fair to poor condition, with the majority of all seams only
minimally protected by the remainder of the existing
coating, as illustrated in photograph #18. The flat plates
that make up the roof overhang are in fair to good
condition, with only scattered breakdown and rust staining
observed. Medium to heavy corrosion was observed along
both the upper and lower legs of the top shell rim angle as
well as the bolted connections for the interior spider rod
assembly that extend through this junction, as shown in
photograph #19. Additional corrosion was also associated
with the lap seams of the overhang and the outer edge of
the overhang at the junction with the vertical drip edge.
Photograph #18
Penetrations cut in the overhang, as well as bolted
connections securing antenna equipment along the roof
perimeter, have resulted in additional areas of coating
failure and medium to heavy rust formation. In some cases,
the attached antenna equipment appears to have resulted in
some structural weakness, particularly where a triangular
mounting tower is attached to the outer edge adjacent to the
shell access ladder, as demonstrated in photograph #20.
Degree of rusting: Scattered medium to heavy rusting is
present along the majority of the top shell rim angle and
roof overhang lap seams and junctions.
Additional
corrosion is associated with the bolted connections of the
internal spider rod assembly as well as the outer drip edge
of the roof perimeter.
Photograph #19
Condition of metal: Overall, the top shell rim angle
appears to be structurally sound, but areas of heavy
corrosion and extensive weeping of rust stain suggest some
metal fatigue that will be further discussed in the Interior
section of this report.
Balcony and handrail:
General condition of coating: Overall, the protective
coatings along the balcony and handrail system are in fair to
poor condition, with the majority of the coatings only
providing minimal protection to the underlying substrate
surfaces. Extensive checking and cracking of the existing
coatings throughout the top face of the balcony walkway
Photograph #20
18
has resulted in failure to the primer or substrate along at
least 30-40% of the observed surfaces. Localized areas of
complete coating failure, often associated with areas of
prolonged water retention, are now experiencing medium to
heavy corrosion and an aggressive surface profile, as
illustrated in photograph #21. The addition of new
drainage holes along areas of past water retention may help
to reduce accelerated failure in these areas.
The coatings on the inner shell to walkway rim angle as
well as the outer walkway support beam are in poor to fair
condition, with widespread coating failure and medium
surface corrosion throughout as indicated in photograph
#22. The underside of the walkway surface is in better
condition, but checking of the coating was evident and light
rust bloom is breaking through the coatings in some areas.
The observed corrosion in these areas appears to be a
surface condition, with no significant metal fatigue
observed.
The balcony handrail system is also exhibiting widespread
cracking and delamination of the existing coatings,
particularly along the top horizontal face of the handrail as
well as leading edges of the vertical stanchions and crossbracing, as shown in photograph #23. Areas of heavy rust
formation were also noted along the localized areas of the
kick plate junction with the walkway surface as well as
connections between the cross-bracing and the vertical face
of the kick plate.
Photograph #21
Photograph #22
Degree of rusting: Medium to heavy corrosion was
observed along at least 15-20% of the balcony and handrail
surfaces.
Condition of metal: The balcony and handrail appear to
be intact and structural sound, with the majority of all
corrosion confined to a surface condition. No significant
metal loss was associated with the majority of all rivets and
bolted connections of the walkway and handrail system
beyond a rough surface profile.
Adhesion of coatings:
Adhesion of the top coats
throughout the balcony is poor, with localized areas of
complete failure to the substrate noted throughout both the
walkway and handrail. The extent of failure noted suggests
the service life of the coatings in these areas has expired.
Photograph #23
19
Overflow system:
Type: The overflow system is comprised of a ~4ӯ stub
pipe extending ~6”-8” from the upper shell surface. The
pipe opening has been protected by a wide-mesh wire
screen secured in place with a banding clamp.
General condition of coating: The protective coatings on
the overflow stub are in fair to good condition, with the
exception of scattered cracking and light rust observed.
Additional rust stain emanating from the pipe opening was
also observed along the interior and exterior pipe. The
bolted connections securing the overflow are beginning to
protrude from the shell wall, and the exposed bolts are
showing uniform medium corrosion along all uncoated
surfaces, as shown in photograph #24.
Photograph #24
Degree of rusting: Light to medium rusting was noted
along 3-5% of the visible overflow surfaces.
Condition of metal: The overflow stub appears to be
functional at this time, but two of the bolted connections
that secure the assembly in place are beginning to protrude
along the exterior. The extent of failure associated with
these connections could not be determined as the pipe was
not readily accessible.
Condition of screen/flapper: The stainless steel wire
mesh screen is intact and effectively protecting the opening,
as indicated in photograph #25.
Photograph #25
Is there a weir box? The overflow is not equipped with a
weir box assembly.
Shell ladder(s):
Is ladder equipped with a cage? No.
Safety climb device: None.
General condition of coating: The coatings on the shell
access ladder from the balcony level to the roof are in poor
to fair condition, with widespread failure observed. Areas
of cracking, peeling and delamination to the substrate were
noted along at least 20% of the observed surfaces, primarily
associated with the side rails and top faces of the ladder
rungs, as shown in photograph #26.
Photograph #26
20
Degree of rusting: Medium to heavy corrosion is
occurring along 15-20% of the shell ladder.
Condition of metal: The shell ladder appears to be intact
and sound, with the bolted connections securing it the roof
ladder in good structural condition. The base of the shell
ladder section has been secured to the outer face of the
balcony handrail by two uncoated U-bolt assemblies.
Rigging attachments: The exterior shell is not equipped
with any rigging attachments.
Additional shell and balcony attachments:
Type: There are a series of L-angle brackets bolted to the
balcony walkway surface, as indicated in photograph #27,
which were used at one time to secure antenna cables. The
majority of these cable brackets are no longer in use and
they should all be removed for safety reasons, relocating
any remaining cables to the outside of the balcony.
Photograph #27
21
EXTERIOR BOWL & RISER
Bowl plates:
General condition of coating: The coatings on the
underside of the bowl are in fair condition, with scattered
cracking, peeling and delamination of the coatings noted
primarily along the rivet heads and lap seams. Seam
junctions and exposed substrate surfaces are now
experiencing medium to heavy rust, with no obvious metal
loss noted, as illustrated in photograph #28. It is estimated
that 15% of the lap seams and rivet heads are affected with
some corrosion, while much less light to medium rust was
observed along the bowl plates themselves. The upper
bowl plates are in good condition, as demonstrated in
photograph #29, with only minor areas of corrosion
associated with scattered lap seams.
Photograph #28
The coating has a slightly different appearance along the
upper bowl surfaces compared with the lower bowl, as
shown in photograph #30, likely the result of chalking or
weathering.
While the condition affects the overall
appearance of the tank, it does not appear to be detrimental
to the remaining coating.
Degree of rusting: Medium to heavy corrosion was
observed along 15% of the lap seams and rivets. Light to
medium rust bloom was observed along less than 2% of the
bowl plates.
Condition of metal: The bowl appears to be structurally
sound, with primarily surface corrosion observed that has
not progressed to any significant metal fatigue at this time.
No significant metal loss along the rivet heads was
observed from the access ladder or ground level.
Photograph #29
Adhesion of coatings: Adhesion of the coatings along the
bowl plates appears to be fair to good, with only scattered
checking and cracking noted. More significant adhesion
failure was associated with lap seams and rivet heads
resulting in delamination to the substrate.
Cylinder to tank bottom connection: The junction of the
bowl with the top of the riser is plumb and appears to be
sound as viewed from ground level.
Photograph #30
22
Cylinder riser:
General condition of coating: The protective coatings on
the exterior riser are in poor to fair condition, with
widespread checking and cracking to the substrate resulting
in light to medium corrosion, as demonstrated in
photograph #31. More significant corrosion was noted
along the one set of rivet heads connecting the second to
third cylinder sections of the riser pipe, as indicated in
photograph #32. This area has experienced leakage in the
past and was subsequently repaired, with no active leakage
occurring at this time. There is a significant amount of
coating failure noted in this area, with evidence of medium
to heavy rust and rust staining also noted. The majority of
all riser pipe surfaces were also moderately stained and
soiled, with the most extensive soiling along the bottom
cylinder section, as shown in photograph #33.
Photograph #31
Degree of rusting: Light to medium corrosion is breaking
out through the coatings throughout the riser cylinder.
Localized areas of medium to heavy corrosion are
associated with the one riveted seam along the riser as well
as scattered areas of the weld seams.
Condition of metal: The riser cylinder appears to be intact
and structurally sound, with the exception of the single
riveted seam between the second and third cylinder
sections. Heavy corrosion and evidence of past leakage
that has since been repaired suggests significant metal loss
is occurring along this junction. Additional welding repairs
or replacement of this riser section should be anticipated
during the next maintenance operations.
Photograph #32
Adhesion of coatings: Adhesion of the coating on the riser
is poor to fair as observed along the majority of the exterior
tank surfaces. Widespread checking and cracking of the
coatings extending to the substrate suggests the service life
of the paint system has expired.
DFT of coatings: 2.0 to 7.3 mils, with an average of 3.27
mils for the readings taken along the exterior riser bottom
ring. Refer to the attached printout for individual readings.
Photograph #33
23
Riser access manhole(s):
Type: One 12”×18” oval manhole secured by two
retention bolt and clamp assemblies.
General condition of coating: The coatings on the riser
manhole are in poor to fair condition as observed along the
other riser surfaces. General coating failure and scattered
areas of medium to heavy rust were noted throughout 1520% of the observed surfaces, as indicated in photograph
#34. The threaded bolts and securing nuts appear to be
relatively new and were touched up with a different color
than the remainder of the tank. The new nuts in the cover
inserts were not coated and are exhibiting uniform medium
corrosion along the visible surfaces.
Degree of rusting: Medium to heavy corrosion was noted
along 15-20% of the manhole surfaces.
Photograph #34
Condition of metal: The manhole appears to be intact and
structurally sound, with new nut and bolt assemblies
securing the cover in place.
Are manholes leaking? There is no evidence of any
leakage from the manhole at this time.
Rigging attachments:
Type: There is a series of clips along the upper portion of
the riser cylinder, likely used to anchor a series of radial
rods that are no longer present.
General condition of coating: The riser brackets are in
the same general condition as the remainder of the riser
surfaces, with scattered top coat failure not along surfaces
visible from ground level and the access ladder, as shown
in photograph #35.
Degree of rusting: Minor light to medium corrosion was
noted along scattered bracket leading edges.
Condition of metal: The bracket assemblies appear to be
intact and structurally sound, but should be further
inspected by the contractor prior to any use for rigging
purposes.
Photograph #35
24
Additional bowl or riser attachments:
Type: There are a series of utility boxes and conduits
attached to the base of the riser, as illustrated in photograph
#36. The junction surfaces between the utility boxes and
conduits with the riser surface are experiencing significant
top coat delamination, scattered corrosion and heavy
soiling.
It will likely be necessary to remove these items from the
rise surfaces in order to properly clean and paint the
underlying surfaces during the next maintenance
operations.
Photograph #36
There is a valve stem extending from the base of the riser
cylinder. The valve stem appears to be intact, although the
coatings are heavily abraded and uniform corrosion is now
evident, as demonstrated in photograph #37. It is unknown
if the valve assembly is functional at this time.
Photograph #37
25
EXTERIOR SUPPORT STRUCTURE
Columns and struts:
General condition of coating: The coatings along the
exterior faces of the leg columns and horizontal struts are in
generally very good condition, as indicated in photograph
#38, with less than 2% of the referenced surfaces exhibiting
failure to the steel substrate. The majority of this
deterioration appeared to be restricted to the very top of the
leg columns as well as the bottom 5-6’.
The inboard surfaces of the leg columns as well as localized
areas of the struts were exhibiting a significantly greater
degree of coating failure primarily in the form of localized
areas of cracking and delamination, both of which extend
back to base coat of primer and/or the steel substrate. This
deterioration has resulted in medium to heavy rust
formation as well as the exposure of mill scale, as shown in
photograph #39. The presence of mill scale would suggest
that not all surfaces have been abrasive blast cleaned to
bare metal since the subject tank was built. Furthermore,
there was evidence of past coating applications suggesting
that not previous coatings were removed during the last
several maintenance operations.
Degree of rusting: Medium to heavy rusting was observed
along less than 2% of the exterior surfaces and as much as
15% of the interior surfaces, with the majority of the
rusting found along the backside of the lattice work, as
demonstrated in photograph #40.
Photograph #38
Photograph #39
Condition of metal: There is evidence of localized areas
of past metal loss however there was no evidence of any
appreciable new metal loss currently taking place.
Adhesion of coatings: Adhesion was only fair to poor
along the exterior surfaces of the leg columns and generally
poor along the inboard surfaces of the columns, at least
along areas checked.
DFT of coatings: 3.9 to 15.4 mils, with an average of 7.59
mils for the readings taken along the exterior lower leg
column surfaces. Refer to the attached printout for
individual readings.
Photograph #40
26
Tower rods, cylinder rods and pins:
General condition of coating: The coatings along the
sway rods are in fair to poor condition with at least 25-30%
of the referenced surfaces already exhibiting failure to the
substrate and medium to heavy rusting as shown in
photograph #41.
The coatings along the sway rod turnbuckles, yokes and
retention pins are also exhibiting scattered coating failure as
shown in photograph #42, however to a much lesser degree
than what was observed along the rods themselves.
The radial rods were found to be in poor condition with at
least 60% of these surfaces exhibiting failure to the
substrate and subsequent rust formation.
Photograph #41
Degree of rusting: Medium to heavy rusting with a few
localized areas of light rust was noted along the items
referenced above.
Isolated areas of stratified rust
formations were also observed along several of the radial
rods as well as the connection brackets along the riser.
Condition of metal: The majority of the rusting observed
was of a surface grade. However localized of stratified rust
would suggest at least a slight to moderate degree of metal
loss along the affected surfaces.
Adhesion of coatings: Adhesion appears to be only fair to
poor as evidenced by the cracked and delaminating coating
observed.
Photograph #42
Adjusted correctly?
The sway rods appear to be
adequately tensioned with no evidence of any excessive
slack observed.
Are nuts in place and tight? All observed nuts and
washers along the retention pins looked good
Base plates and column shoes:
General condition of coating: The coatings along the
base of the leg columns are in generally good condition
with the exception of scattered areas of complete failure
and subsequent rust formation along less than 10% of the
referenced surfaces. The majority of this coating failure
and rust formation was taking place along the leading edges
Photograph #43
27
of the base plate as shown in photograph #44, as well as the
reinforcement plates located just below the anchor bolt
retention nuts within the confines of the column shoes.
Degree of rusting: Rusting is of a medium to heavy grade
and is present along as much as 10% of the referenced
surfaces.
Condition of metal: The column shoes and base plate are
in generally good condition with no significant metal loss
present except in behind the name plaque present along the
ladder leg. Heavy stratified rust behind the plaque suggests
that at least slight to moderate metal loss may be occurring.
Photograph #44
Adhesion of coatings: Fair to good with the exception of
the immediate areas of failure.
Leg column ladder:
Is ladder equipped with a cage? No.
Is there a ladder gate? No.
Are there rest stop platforms? No.
How far from ground level? 4’±.
Safety climb device: None present. In order to ensure
compliance with current OSHA requirements a fall
prevention device such as a flexible cable system should be
installed as soon as possible.
General condition of coating: The coatings along the
ladder assembly are in only fair condition with extensive
degradation and complete failure already taking place along
40% of the ladder rung surfaces as well as 10-15% of the
ladder side rails and support brackets.
Photograph #45
Degree of rusting: Rusting is of a medium to heavy grade
as indicated in photograph #46 and is affecting 30-35% of
the ladder rungs as well as 10% of the side rails and support
brackets.
Condition of metal: All observed rusting appears to
affecting only a surface condition with no appreciable metal
loss currently taking place. However it was noted that there
is no fall prevention device installed along any of the
ladders as referenced above and there is no protective
shrouding or ladder gate to prevent unauthorized access.
Photograph #46
28
EXTERIOR FOUNDATION & ATTACHMENTS
Anchor bolts:
General condition of coating: The coatings along (5) out
of (6) anchor bolt retention nuts has completely failed
resulting in extensive corrosion of the referenced items as
indicated in photograph #47. Only (1) anchor bolt was
found to be in generally fair to good condition.
Degree of rusting: Heavy rust and stratified rust formation
was observed along at least 90% of the (5) referenced
anchor bolt retention nuts
Condition of metal: (5) anchor bolt retention nuts are
exhibiting up to a 30% + reduction in size as shown in
photograph #48 and should be replaced as soon as feasible
to do so.
Photograph #47
Foundation:
Concrete chipped or cracked: The visible concrete
surfaces of the leg column footings looked very good with
only minor surface degradation evident as indicated in
photograph #49. It was noted however that (3) of the
footings are experiencing substantial soil and vegetation
encroachment.
The surrounding vegetation and soil should be excavated
back sufficiently so as to expose at least the top 3-4” of the
footings. This will help promote drainage away from the
base of the leg columns and help retard any aggressive
degradation of the leg column base plates and the top of the
footings.
Photograph #48
A very similar situation also exists along the footing of the
center riser of the tank as shown in the attached
photographs and enclosed video. The visible concrete
surfaces look generally good however approximately 50%
of the concrete footing is cover with soil and vegetation.
Grout chipped or cracked: There was no evidence of
grout between the leg columns and footing, however there
was concrete grout between the base of the riser and the
footing. This grout was found to be in generally very good
Photograph #49
29
condition with only minor surface degradation observed as
shown in photograph #50.
Indication of settlement: There is no evidence of any
significant shifting or settlement damage associated with
the tank support structure.
Undermining of foundation: There are no signs of any
significant undermining of the leg column concrete footings
or base of the riser.
Indication of leakage: There is no evidence of any active
leakage from the base of the riser.
Condition of valve vault: No valve vault was inspected
during the course of the evaluation.
Site drainage conditions: Fair to poor. Substantial soil
and vegetation encroachment have affected several of the
leg columns and riser as previously referenced.
Photograph #50
30
INSPECTION DATA - INTERIOR
INTERIOR ROOF
Was tank empty? The interior water chamber was
inspected by ROV method.
If not, how far down from overflow? 8’±.
Underside of roof plates:
General condition of coating: The coatings along the
underside of the roof are exhibiting localized areas of
complete failure and rust formation along at least 12% of
the roof plate surfaces. In addition there is extensive rust
and stratified rust formation along at least 45% of the roof
lap seams.
Photograph #51
Degree of rusting: Light to medium rusting along the roof
plate surfaces with heavy rust and stratified rust along lap
seams.
Condition of metal: There is evidence of significant metal
loss along lap seams as well as substantial separation of the
seams due to the build-up of stratified rust as shown in
photograph #52. The build-up of stratified rust has also
resulted in failure of scattered rivets which it turns has
resulted in scattered areas of holes and open seams.
Adhesion of coatings: The coating along the majority of
the roof plates is still exhibiting generally good adhesion at
all interfaces.
Photograph #52
DFT of coatings: 1.3 to 3.7 mils, with an average of 2.56
mils for the readings taken along the interior roof. Refer to
the attached printout for individual readings.
Condition of laps and rivets: The roof lap seams have
been severely compromised along a number of areas due to
the build-up of stratified rust and loss of rivets as
previously referenced. At this time it is estimated that there
is as many as (24) separate locations along the seams which
have already opened up as shown in photograph #53. It is
currently estimated that at least 70-90 linear feet of roof
seam would have to be cleaned of all stratified rust, re-fit
Photograph #53
31
and welded with additional areas caulked as referenced in
the exterior portion of this report.
Roof to shell connection:
General condition of coating: The coatings along the roof
to shell angle are exhibiting complete failure to the steel
substrate along at least 75% of the entire perimeter of the
referenced surfaces.
Degree of rusting: Heavy rust and extensive stratified rust
formation was noted along at least 75% of the referenced
area.
Condition of metal: There is evidence of substantial
stratified rust formation along localized areas suggesting
the probability of extensive metal loss of affected surfaces.
It is anticipated that significant welding repairs, if not
sectional replacement, would be required along this area if
the tank was to be rehabilitated.
Photograph #54
Roof framing:
Type: The roof support structure is comprised of 15 Cchannel rafters bolted to a center compression ring as
shown in photograph #55, and to bracket the assemblies at
the roof to shell junction. Additional lateral bracing is
riveted to adjacent rafters and bolted through the plates
above at the roof midpoint. Additional flat stock crossbracing is present within the center compression ring.
General condition of coating: The coatings along the roof
support structure is in generally fair to good condition with
the exception of scattered coating failure and subsequent
rust formation primarily along the top and bottom faces of
the bottom rafter flanges, rafter ends and shell support
brackets, bolted and riveted connections, top and bottom
flanges of lateral supports as well as isolated areas of rafter
webs as shown in adjacent photographs.
Photograph #55
Degree of rusting: Rusting ranges from light to heavy and
is affecting as much as 10-12% of the referenced surfaces.
Condition of metal: The support structure appears to be
intact and structurally sound at this time however, there is
evidence of slight metal loss taking place along the rafter
ends and shell support brackets. There is also significant
Photograph #56
32
metal loss along as many as (12) retention nuts with as
much as 75% of the nuts completely corroded away
Rigging attachments: The interior roof is not equipped
with any rigging attachments other than the center finial
vent opening.
Cathodic protection:
Type: The interior water chamber appears to be equipped
with the remnants of a suspended anode cathodic protection
system.
Photograph #57
Working? The current state of the cathodic equipment
suggests the system is no longer functional or even intact.
33
INTERIOR SHELL
Shell plates:
General condition of coating: The coatings along the
bottom shell ring surfaces are in poor condition with
extensive light to medium rusting evident along at least
65% of the referenced surfaces. Additional areas of heavy
rust and rust tubercle formations were also observed to be
scattered along an additional 3-5% of the bottom ring
surfaces, the majority of which were along rivet heads.
The 2nd (middle) shell ring was found to be in much better
condition however as much as 25% of the surfaces were
exhibiting failure to the substrate and subsequent rust
formation. The greatest degree of this rusting was along
areas which had been previously damaged by welding of
antennas to the shell exterior. These areas were touch-up
after the damage however the touch-up coating is failing as
shown in photograph #59.
Photograph #58
The coatings along the top shell ring are in generally very
good condition with less than 12% of these surfaces
exhibiting to the substrate. This failure is primarily along
areas previously damaged and patched as well as surfaces
just above the top ring to 2nd ring lap seam.
Degree of rusting: Light to medium rusting with scattered
rusting was observed along 65% of the bottom shell ring.
Light to medium rusting was observed along as much as
25% of the 2nd shell ring.
Photograph #59
Condition of metal: Generally good. However, there is
evidence of scattered rust tubercles which would suggest
the potential for pitting. There is also evidence of a
significant degree of past metal loss primarily in the form
of a generalized pitting along all shell surfaces,
Adhesion of coatings: Adhesion of the coatings still
appears to be good with the exception of the patched
surfaces which were exhibiting cracked and delaminated
coating.
DFT of coatings: 3.1 to 11.1 mils, with an average of 5.68
mils for the readings taken along the interior shell. Refer to
the attached printout for individual readings.
Photograph #60
34
Condition of laps and rivets: The lap seams are
exhibiting evidence of pitting however at least 90% of the
rivets appear to still be retaining 95% of grater head
dimension. Only scattered rivets appear to be exhibiting as
much as a 59% reduction in size.
Interior weir box:
General condition of coating: The interior overflow is
equipped with a small funnel and elbow assembly. The
coatings along the referenced item appear to be in fair to
good condition with the exception of the connection to the
shell and scattered retention bolts.
Photograph #61
Degree of rusting: Medium to heavy rusting and stratified
rust was observed along scattered bolted connections as
well as the junction between the flange of the elbow and the
shell wall. The stratified rust appears to have resulted in a
significant separation between the wall of the shell and the
flange of the elbow through which light can be observed.
Condition of metal: The integrity of the bolted assemblies
is questionable based on the size of the gap between the
elbow and shell wall as well as the fact the exterior face of
the bolts appears to be backed off from the shell as noted in
the “exterior” portion of this report.
Tank ladder: The interior water chamber is not equipped
with an access ladder.
Photograph #62
Rigging attachments:
Type: The tank is equipped with a spider rod assembly.
General condition of coating: The coating along the
spider assembly is in an advanced stage of failure with at
least 65% of the coating already failed back to the steel
substrate surfaces as shown in photographs #62 and #63.
Degree of rusting: Medium to heavy rusting was observed
along at least 65% of the spider assembly.
Condition of metal: The spider center hub and rods
appear to be intact at this time however; there is evidence
of both past and current metal loss taking place along the
majority of all surfaces. The spider assembly should be
considered unsafe for access and/or rigging.
Photograph #63
35
INTERIOR BOWL & RISER
Bowl plates:
General condition of coating: The coatings along the
bowl surfaces are in poor condition with as much as 35% of
the referenced surfaces exhibiting failure to the substrate
and subsequent rust formation. The majority of the rusting
found along the main plate surfaces was of a light to
medium grade however scattered areas of medium to large
rust tubercles were noted to be emanating through the silt
along the lower surfaces.
Degree of rusting: Light to heavy rusting with at least
scattered rust tubercles were observed along as much as
35% of the bowl surfaces.
Photograph #64
Condition of metal: The presence of medium to large rust
tubercles would suggest the possibility of a least slight to
moderate metal loss in the form of pitting along the main
bowl plate surfaces. At this time there appears to be less
than (300) rust tubercles which would suggest the strong
possibility of significant pitting. There is also evidence of a
significant degree of past metal loss throughout the entire
bowl.
Adhesion of coatings: The adhesion of the coatings
appears to be highly questionable particularly along areas
where there appears to be small but dense blistering.
Condition of laps and rivets: The majority of the heaviest
rust and rust tubercle formations were observed along the
lower bowl rivets, but not limited to these surfaces. This
corrosion appears to have resulted in as much as a 10-15%
reduction in the size of the affected rivet heads as indicated
in photograph #65. However, at this time it is estimated
that at least 80% of the rivets still appear to be retaining at
least 90% of greater head dimension.
Photograph #65
Cylinder riser:
General condition of coating: The coatings along the
interior surfaces of the riser are in extremely poor condition
with at least 45% of the coating already failed to the degree
in which the steel substrate has been exposed and is
exhibiting extensive corrosive activity. The remaining
Photograph #66
36
coating also appears to be exhibiting extensive blistering.
This blistering appears to be small in size and dense in
areas.
Degree of rusting: Rusting is of a medium to heavy
degree with at least 40% of the surfaces affected. There is
also substantial rust tubercle formations present throughout
the entire riser with the frequency of these rust tubercles as
high as 15-20 per square foot. However the overall average
appears to be more in the 5-10 per square foot range as
indicated in photograph #67.
Condition of metal: The presence of extensive medium to
large rust tubercle formations would suggest the potential
for extensive metal loss in the form of pitting. In addition,
several years ago leaks developed in the riser at the lower
riveted junction. These leaks were a result of scattered
pitting completely penetrating the riser wall. These areas
were welded closed along the interior face as was the
majority of the interior face of the junction. However no
further repairs were performed at that time.
Photograph #67
Adhesion of coatings: The adhesion of the remaining
coatings appears to be questionable.
Condition of laps and rivets: The majority of the seams
are of welded construction. However the splice connection
between the (2) main riser sections are riveted and this is
the area which was previously repaired by welding multiple
passes along nearly the entire girth seam. There is currently
extensive rusting taking place along this junction which
impeded a good visual examination of the surfaces as
shown in photograph #68. The presence of large rust
tubercles along the areas however would suggest the
potential for significant metal loss.
Riser floor:
General condition of coating: The interior floor was not
visible during the inspection due to the high water turbidity
and dark staining present along the riser cylinder. In
addition, there appeared to be 1-2” of silt along this area
which further impeded visual assessment of the surfaces.
Riser ladder: The interior riser is not equipped with an
access ladder.
Photograph #68
37
Interior inlet/outlet line(s):
Type: The pipe appears to be approximately 6” in diameter
and extends up into the riser approximately 18”±
General condition of coating: There is evidence of
extensive corrosion and rust tubercle formations along the
majority of the visible surfaces as shown in photograph
#69.
Degree of rusting: Medium to heavy with moderate to
large sized rust tubercles.
Condition of metal: The extent of rust tubercle formation
would suggest significant metal loss in the form of pitting
may be taking place.
Photograph #69
Rigging attachments:
Type: No rigging attachments were present within the riser
Additional bowl or riser attachments:
Type: There is a valve assembly located in the base of the
riser cylinder. Overall condition is unknown due to limited
visibility of surfaces
Photograph #70
38
APPENDICES
APPENDICES FOR THIS REPORT INCLUDE:
Individual DFT Measurements for:
Exterior Roof Surfaces
Exterior Shell Surfaces
Exterior Riser Bottom Ring Surfaces
Exterior Lower Leg Column Surfaces
Interior Roof Surfaces
Lead Test Results for:
Exterior Coating System
Additional Materials that Accompany this Report:
Exterior Inspection Video with narration
Interior Inspection Video with narration
Additional Digital Photographs in a pdf gallery
Locke Rd Elevated Chelmsford, MA 12/02/08 DFT Readings
Readings - Interior Roof
1
1:34:07 PM
2
1:34:09 PM
3
1:34:11 PM
4
1:34:13 PM
5
1:34:15 PM
6
1:34:18 PM
7
1:34:20 PM
8
1:34:22 PM
9
1:34:24 PM
10
1:34:26 PM
11
1:34:28 PM
12
1:34:30 PM
13
1:34:35 PM
14
1:34:39 PM
15
1:34:41 PM
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
Summary - Interior Roof
Max
Min
Mean
StdDev.
Annotations - Interior Roof
Gage Model: 6000F3
Gage S/N: 66013
Probe Model: F
Probe S/N: 43253
User:
Part:
Substrate:
1.75
2.4
3.7
2.6
2.1
2.1
3.4
2.3
2.8
3.5
3.1
3.2
2.0
2.1
1.30
3.70
1.30
2.56
0.70
Locke Rd Elevated Chelmsford, MA 12/02/08 DFT Readings
Readings - Interior Shell
1
1:35:01 PM
2
1:35:03 PM
3
1:35:05 PM
4
1:35:07 PM
5
1:35:09 PM
6
1:35:11 PM
7
1:35:14 PM
8
1:35:16 PM
9
1:35:18 PM
10
1:35:20 PM
11
1:35:23 PM
12
1:35:25 PM
13
1:35:27 PM
14
1:35:29 PM
15
1:35:31 PM
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
Summary - Interior Shell
Max
Min
Mean
StdDev.
Annotations - Interior Shell
Gage Model: 6000F3
Gage S/N: 66013
Probe Model: F
Probe S/N: 43253
User:
Part:
Substrate:
3.6
3.8
4.2
3.6
3.1
7.2
6.4
6.7
6.6
4.8
4.8
7.5
11.1
5.7
6.1
11.10
3.10
5.68
2.07
Locke Rd Elevated Chelmsford, MA 12/02/08 DFT Readings
Readings - Exterior Roof
1
1:35:58 PM
2
1:36:00 PM
3
1:36:03 PM
4
1:36:05 PM
5
1:36:08 PM
6
1:36:10 PM
7
1:36:12 PM
8
1:36:14 PM
9
1:36:17 PM
10
1:36:19 PM
11
1:36:21 PM
12
1:36:24 PM
13
1:36:26 PM
14
1:36:29 PM
15
1:36:31 PM
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
Summary - Exterior Roof
Max
Min
Mean
StdDev.
Annotations - Exterior Roof
Gage Model: 6000F3
Gage S/N: 66013
Probe Model: F
Probe S/N: 43253
User:
Part:
Substrate:
5.1
4.1
6.5
5.7
7.5
15.4
9.0
4.6
2.2
4.3
7.3
5.8
4.1
4.8
6.1
15.40
2.20
6.17
3.05
Locke Rd Elevated Chelmsford, MA 12/02/08 DFT Readings
Readings - Exterior Shell
1
4:16:40 PM
2
4:16:42 PM
3
4:16:44 PM
4
4:16:46 PM
5
4:16:48 PM
6
4:16:50 PM
7
4:16:52 PM
8
4:16:54 PM
9
4:16:56 PM
10
4:17:00 PM
11
4:17:02 PM
12
4:17:04 PM
13
4:17:06 PM
14
4:17:08 PM
15
4:17:10 PM
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
Summary - Exterior Shell
Max
Min
Mean
StdDev.
Annotations - Exterior Shell
Gage Model: 6000F3
Gage S/N: 66013
Probe Model: F
Probe S/N: 43253
User:
Part:
Substrate:
5.5
4.7
3.2
10.1
5.6
5.5
6.3
4.2
4.0
6.4
5.0
4.0
4.1
7.1
3.9
10.10
3.20
5.31
1.72
Locke Rd Elevated Chelmsford, MA 12/02/08 DFT Readings
Readings - Exterior Riser
1
4:31:01 PM
2
4:31:06 PM
3
4:31:08 PM
4
4:31:10 PM
5
4:31:13 PM
6
4:31:15 PM
7
4:31:17 PM
8
4:31:19 PM
9
4:31:21 PM
10
4:31:23 PM
11
4:31:25 PM
12
4:31:28 PM
13
4:31:30 PM
14
4:31:32 PM
15
4:31:34 PM
Bottom Ring
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
12/2/2008
3.3
2.6
3.5
2.5
7.3
2.5
2.4
4.3
3.9
2.1
2.6
2.0
3.2
3.3
3.6
Summary - Exterior Riser Bottom Ring
Max
Min
Mean
StdDev.
Annotations - Exterior Riser Bottom Ring
Gage Model: 6000F3
Gage S/N: 66013
Probe Model: F
Probe S/N: 43253
User:
Part:
Substrate:
7.30
2.00
3.27
1.30
Locke Rd Elevated Chelmsford, MA 12/02/08 DFT Readings
Readings - Exterior Bottoms of Leg Columns
1
4:33:07 PM 12/2/2008
5.8
2
4:33:09 PM 12/2/2008
6.0
3
4:33:11 PM 12/2/2008
9.0
4
4:33:13 PM 12/2/2008
4.7
5
4:33:16 PM 12/2/2008
5.8
6
4:33:18 PM 12/2/2008
4.9
7
4:33:20 PM 12/2/2008
9.7
8
4:33:26 PM 12/2/2008
13.8
9
4:33:28 PM 12/2/2008
10.4
10
4:33:31 PM 12/2/2008
9.9
11
4:33:33 PM 12/2/2008
3.9
12
4:33:39 PM 12/2/2008
15.4
13
4:33:42 PM 12/2/2008
4.3
14
4:33:44 PM 12/2/2008
6.1
15
4:33:46 PM 12/2/2008
4.1
Summary - Exterior Bottoms of Leg Columns
Max
15.40
Min
3.90
Mean
7.59
StdDev.
3.61
Annotations - Exterior Bottoms of Leg Columns
Gage Model: 6000F3
Gage S/N: 66013
Probe Model: F
Probe S/N: 43253
User:
Part:
Substrate:
Groundwater Analytical, Inc.
P.O. Box 1200
228 Main Street
Buzzards Bay, MA 02532
Telephone (508) 759-4441
FAX (508) 759-4475
www.groundwateranalytical.com
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Page 13 of 13
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior tank 1
Exterior tank 2
Exterior tank 3
Exterior tank 4
Exterior tank 5
Exterior antenna equipment 1
1 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior antenna equipment 2
Exterior antenna equipment 3
Exterior antenna equipment 4
Exterior antenna equipment 5
Exterior antenna equipment 6
Exterior antenna equipment 7
2 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior antenna equipment 8
Exterior antenna equipment 9
Exterior antenna equipment 10
Exterior antenna equipment 11
Exterior antenna equipment 12
Exterior antenna equipment 13
3 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior antenna equipment 14
Exterior antenna equipment 15
Exterior antenna equipment 16
Exterior antenna equipment 17
Exterior antenna equipment 18
Exterior balcony 1
4 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior balcony 2
Exterior balcony 3
Exterior balcony 4
Exterior balcony 5
Exterior balcony 6
Exterior balcony 7
5 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior balcony 8
Exterior balcony 9
Exterior balcony 10
Exterior balcony 11
Exterior balcony 12
Exterior balcony 13
6 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior balcony 14
Exterior balcony 15
Exterior balcony 16
Exterior balcony 17
Exterior balcony 18
Exterior balcony 19
7 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior balcony 20
Exterior balcony 21
Exterior balcony 22
Exterior balcony 23
Exterior balcony 24
Exterior balcony 25
8 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior balcony 26
Exterior balcony 27
Exterior balcony 28
Exterior bowl 1
Exterior bowl 2
Exterior bowl 3
9 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior bowl 4
Exterior bowl 5
Exterior bowl 6
Exterior bowl 7
Exterior bowl 8
Exterior bowl 9
10 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior bowl 10
Exterior bowl 11
Exterior bowl 12
Exterior bowl 13
Exterior bowl 14
Exterior ladder 1
11 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior ladder 2
Exterior ladder 3
Exterior ladder 4
Exterior ladder 5
Exterior ladder 6
Exterior ladder 7
12 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior ladder 8
Exterior ladder 9
Exterior ladder 10
Exterior ladder 11
Exterior leg column 1
Exterior leg column 2
13 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior leg column 3
Exterior leg column 4
Exterior leg column 5
Exterior leg column 6
Exterior leg column 7
Exterior leg column 8
14 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior leg column 9
Exterior leg column 10
Exterior leg column 11
Exterior leg column 12
Exterior leg column 13
Exterior leg column 14
15 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior leg column 15
Exterior leg column 16
Exterior leg column 17
Exterior leg column 18
Exterior leg column 19
Exterior leg column 20
16 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior leg column 21
Exterior leg column 22
Exterior leg column 23
Exterior leg column 24
Exterior leg column 25
Exterior leg column 26
17 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior leg column footing 1
Exterior leg column footing 2
Exterior leg column footing 3
Exterior leg column footing 4
Exterior leg column footing 5
Exterior leg column footing 6
18 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior leg column footing 7
Exterior leg column footing 8
Exterior leg column footing 9
Exterior leg column footing 10
Exterior leg column footing 11
Exterior leg column footing 12
19 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior leg column footing 13
Exterior leg column footing 14
Exterior leg column footing 15
Exterior leg column footing 16
Exterior leg column footing 17
Exterior leg column footing 18
20 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior leg column footing 19
Exterior leg column insert 1
Exterior leg column insert 2
Exterior leg column insert 3
Exterior leg column insert 4
Exterior leg column insert 5
21 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior leg column insert 6
Exterior leg column insert 7
Exterior leg column insert 8
Exterior overflow 1
Exterior overflow 2
Exterior overflow 3
22 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior riser 1
Exterior riser 2
Exterior riser 3
Exterior riser 4
Exterior riser 5
Exterior riser 6
23 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior riser 7
Exterior riser 8
Exterior riser 9
Exterior riser 10
Exterior riser 11
Exterior riser 12
24 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior riser 13
Exterior riser 14
Exterior riser 15
Exterior riser 16
Exterior riser 17
Exterior riser attachments 1
25 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior riser attachments 2
Exterior riser attachments 3
Exterior riser attachments 4
Exterior riser attachments 5
Exterior riser manhole 1
Exterior riser manhole 2
26 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior roof 1
Exterior roof 2
Exterior roof 3
Exterior roof 4
Exterior roof 5
Exterior roof 6
27 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior roof 7
Exterior roof 8
Exterior roof 9
Exterior roof 10
Exterior roof 11
Exterior roof 12
28 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior roof 13
Exterior roof 14
Exterior roof 15
Exterior roof 16
Exterior roof 17
Exterior roof 18
29 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior roof 19
Exterior roof 20
Exterior roof 21
Exterior roof 22
Exterior roof 23
Exterior roof 24
30 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior roof finial ball 1
Exterior roof finial ball 2
Exterior roof finial ball 3
Exterior roof finial ball 4
Exterior roof finial ball 5
Exterior roof hatch 1
31 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior roof hatch 2
Exterior roof hatch 3
Exterior roof hatch 4
Exterior roof hatch 5
Exterior roof hatch 6
Exterior roof hatch 7
32 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior roof hatch 8
Exterior roof ladder 1
Exterior roof ladder 2
Exterior roof ladder 3
Exterior roof ladder 4
Exterior roof ladder 5
33 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior roof ladder 6
Exterior roof overhang 1
Exterior roof overhang 2
Exterior roof overhang 3
Exterior roof overhang 4
Exterior roof overhang 5
34 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior roof overhang 6
Exterior roof overhang 7
Exterior shell 1
Exterior shell 2
Exterior shell 3
Exterior shell 4
35 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior shell 5
Exterior shell 6
Exterior shell 7
Exterior shell 8
Exterior shell 9
Exterior shell 10
36 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior shell 11
Exterior shell 12
Exterior shell 13
Exterior shell 14
Exterior shell 15
Exterior shell 16
37 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior site 1
Exterior site 2
Exterior site 3
Exterior site 4
Exterior site 5
Exterior site 6
38 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior site 7
Exterior site 8
Exterior site 9
Exterior site 10
Exterior struts 1
Exterior struts 2
39 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior struts 3
Exterior struts 4
Exterior struts 5
Exterior struts 6
Exterior struts 7
Exterior struts 8
40 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior struts 9
Exterior struts 10
Exterior struts 11
Exterior struts 12
Exterior support structure 1
Exterior support structure 2
41 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior support structure 3
Exterior support structure 4
Exterior support structure 5
Exterior support structure 6
Exterior support structure 7
Exterior support structure 8
42 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior support structure 9
Exterior support structure 10
Exterior support structure 11
Exterior support structure 12
Exterior support structure 13
Exterior support structure 14
43 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Exterior support structure 15
Exterior support structure 16
Interior bowl 1
Interior bowl 2
Interior bowl 3
Interior bowl 4
44 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Interior bowl 5
Interior bowl 6
Interior bowl 7
Interior bowl 8
Interior bowl 9
Interior bowl 10
45 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Interior riser 1
Interior riser 2
Interior riser 3
Interior riser 4
Interior riser 5
Interior riser 6
46 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Interior riser 7
Interior riser 8
Interior riser 9
Interior riser 10
Interior riser 11
Interior riser 12
47 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Interior riser 13
Interior riser 14
Interior riser 15
Interior riser 16
Interior riser fill pipe 1
Interior riser fill pipe 2
48 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Interior riser manhole 1
Interior riser manhole 2
Interior riser valve assembly 1
Interior riser valve assembly 2
Interior roof 1
Interior roof 2
49 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Interior roof 3
Interior roof 4
Interior roof 5
Interior roof 6
Interior roof 7
Interior roof 8
50 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Interior roof 9
Interior roof 10
Interior roof 11
Interior roof 12
Interior roof 13
Interior roof 14
51 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Interior roof 15
Interior roof 16
Interior roof framing 1
Interior roof framing 2
Interior roof framing 3
Interior roof framing 4
52 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Interior roof framing 5
Interior roof framing 6
Interior roof framing 7
Interior roof framing 8
Interior roof framing 9
Interior roof framing 10
53 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Interior roof to shell junction 1
Interior roof to shell junction 2
Interior roof to shell junction 3
Interior roof to shell junction 4
Interior roof to shell junction 5
Interior shell 1
54 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Interior shell 2
Interior shell 3
Interior shell 4
Interior shell 5
Interior shell 6
Interior shell 7
55 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Interior shell 8
Interior shell 9
Interior shell 10
Interior shell 11
Interior shell 12
Interior shell 13
56 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Interior shell 14
Interior shell 15
Interior shell 16
Interior shell 17
Interior shell 18
Interior shell 19
57 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Interior shell 20
Interior shell 21
Interior shell 22
Interior shell 23
Interior shell 24
Interior shell 25
58 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Interior spider rod assembly 1
Interior spider rod assembly 2
Interior spider rod assembly 3
Interior spider rod assembly 4
Interior spider rod assembly 5
Interior spider rod assembly 6
59 of 60
Locke Rd 250,000 Gallon Elevated Tank Chelmsford, MA
Inspected December 2, 2008
Interior spider rod assembly 7
Interior spider rod assembly 8
Interior spider rod assembly 9
Interior spider rod assembly 10
Interior spider rod assembly 11
60 of 60