Well Replacement Project
Bid No. B14-01
***Specifications***
Bid Questions Due:
Tuesday, June 26, 2013 3:00PM
Gale Stevens, Buyer
gasteven@cabrillo.edu
Bid Documents: Gale Stevens, Buyer 831-477-5613
Cabrillo College: Joe Nugent, Director Facilities Planning & Plant Operations
Project Manager: Jon Salisbury, ICS, Innovative Construction Services, Inc.
Consulting Hydrogeologist: Martin B. Feeney PG, CEG CHg
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Technical Provisions
Cabrillo College
Replacement Well No. 4
CABRILLO COLLEGE
REPLACEMENT WELL NO. 4
TECHNICAL PROVISIONS
Section 100 -
Intent of Contract Documents
Section 101 -
Purpose
Section 102 -
Location
Section 103 -
Local Conditions and Geology
Section 104 -
Qualifications of Contractor
Section 105 -
Construction Schedule
Section 106 -
Overview of Work to be Done
Section 107 -
Other Work Required
Section 108 -
Services Provided to Contractor
Section 109 -
Water Supply for Construction
Technical Provisions
Cabrillo College
Replacement Well No. 4
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SECTION 100 - INTENT OF CONTRACT DOCUMENTS
It is the intent of the Contract Documents to provide Cabrillo College (hereinafter
referred to as College) with a complete and fully operational water well as specified.
The proposed well is designated as Replacement Well No. 4.
SECTION 101 - PURPOSE
The purpose of this project is to provide a replacement well for the existing Cabrillo
College Well No. 1 located at the same location. The design capacity of the well is
200 gallons per minute (gpm).
SECTION 102 - LOCATION
The site is located on the College campus in the City of Aptos in Santa Cruz County.
Cabrillo College Replacement Well No. 4 will be located approximately 50 feet
southeast of the existing well. The location of the site is shown on Figure 1 – Site
Location Map. Figure 2- Site Plan, shows a possible site layout for construction
operations.
It will be the responsibility of the Contractor to have inspected the drilling site and to
make provisions for physically moving onto and off each site with personnel,
equipment and supplies, and materials.
SECTION 103 - LOCAL CONDITIONS AND GEOLOGY
The new well is a replacement well. Data from the College's existing wells provides
for an understanding of the site hydrostratigraphy. The well bore, as specified will
encounter inter-bedded sandstone and claystone assigned to the Purissima
Formation.
The anticipated static water level in the new well is approximately 220 feet.
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Technical Provisions
Cabrillo College
Replacement Well No. 4
Figure 1 – Site Location Map
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Technical Provisions
Cabrillo College
Replacement Well No. 4
Figure 2- Site Plan
Technical Provisions
Cabrillo College
Replacement Well No. 4
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SECTION 104 – Equipment Specifications
Contractor shall provide drilling equipment of sufficient capacity to drill the hole
required by these specifications to a depth of approximately 1000 feet. All drilling
equipment including mast and drawworks, air compressors, drilling fluid pumps, drill
pipe, etc., must be of requisite size, sufficient capacity, and suitable condition to drill
and set casing to the anticipated depths.
The drill rig utilized must have the ability to fully lift and land the anticipated casing
loads without the use of float plugs or other similar methods. All drill pipe must
utilize threaded flush or upset tool joints, or flanged pipe, or equal, as approved by
the Owner's Technical Representative or Project Manager here after co-notated as
“OTR” or “PM”.
The contractor shall take all measures to reduce noise impacts. It is assumed that all
equipment will have working mufflers and/or other noise suppression devices and
complies with all applicable State of California Highway and Santa Cruz County noise
ordinances.
SECTION 105 - CONSTRUCTION SCHEDULE
The project's construction time is estimated to be 43 calendar days. It is understood
that the Contractor will anticipate any adverse weather conditions and will take the
necessary measures to ensure that work will progress to the completion of the
project.
The Contractor shall conduct construction operations on a continuous 24-hour per day
basis until initial development (airlifting and swabbing) is completed. The College
recognizes that drilling efficiency and rapid advance rates both for the pilot hole and
reamed borehole are critical to the successful completion of each well. The contractor
shall be expected to drill the well from commencement of drilling below the surface
conductor casing, reaming the pilot borehole, setting casing, gravel packing,
cementing, and initial development without significant delays. A construction
schedule must be submitted at the preconstruction meeting for review by the OTR or
PM.
SECTION 106 -1 OVERVIEW OF WORK TO BE DONE
The well can be drilled with either direct or reverse rotary methods,
however, due to discharge requirements, bentonite-based drilling fluid will
not be allowed. Contractor shall submit, at the Preconstruction Meeting,
proposed drilling methods and fluid program.
Technical Provisions
Cabrillo College
Replacement Well No. 4
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SECTION 106-2 - REQUIREMENTS OF WORK
Work includes the furnishing of all materials, labor, equipment, fuel, tools,
transportation, and services for drilling, construction, development, testing, and
completion of the well as described in these specifications. While the final design of
the well may change based on information from the pilot hole, the general work
required applicable to the project include:
1. Move equipment on (and off) of the site. Establish tankage for storage of
displaced fluids and treatment of development water.
2. Drill the top 50 feet of hole approximately 24 inches in diameter, install 20inch diameter, carbon steel conductor (surface) casing to a depth of 50 feet
below ground surface (bgs), and grout the annular space between the casing
and the wall of the hole from the bottom of the conductor to ground surface.
3. Drill a pilot borehole to a depth of 825 feet, collect drill cuttings, and maintain
a detailed drilling time log, drilling fluid properties log, and drill cuttings log.
4. Provide for, and assist with, conducting geophysical borehole logs using
spontaneous potential (SP), natural gamma and resistivity surveys of the pilot
hole.
5. Ream the pilot hole to a diameter of 18-inch inches.
6. Install approximately 265 feet of 2-inch diameter, mild steel permanent gravel
feed tube.
7. Install approximately: 1) 270 feet of 8-inch diameter, PVC blank casing; 2)
450 feet of 8-inch diameter PVC perforated casing; 3) Several lengths of 8inch diameter PVC blank between perforated intervals; and 4) 10 feet of 8inch diameter PVC blank with end cap as cellar.
8. Install 8-16 gradation gravel pack in the annulus between a depth of 250 feet
and the bottom of the reamed borehole.
9. Install a cement grout annular seal to a depth of 250 feet.
10. Develop the well through both swabbing and air-lifting.
11. Install and remove test pump for final development and well performance
aquifer testing.
12. Perform Acceptance Video
13. Disinfect the well.
14. Clean up the site.
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Technical Provisions
Cabrillo College
Replacement Well No. 4
The tentative design of the well is as follows:
Depth Interval
(feet)
0 to 50
0 to 270
270 to 815
(intermittent
multiple
zones)
Between screens
815 to 825
0 to 265
0 to 250
250 to 825
Casing/Annular Material
20-inch O.D., ¼-inch wall thickness carbon steel
conductor casing
8-inch diameter, SDR 17 PVC blank well casing
8-inch diameter., SDR 21 PVC perforated well casing 0.050 inch slots
8-inch diameter., SDR 21 PVC blank well
8-inch diameter., SDR 17 PVC blank well casing blank
well cellar w/ cap.
2-inch diameter, mild steel gravel feed tube, schedule
40.
Cement grout annular seal.
Select gravel pack, 8-16 gradation.
The Contractor is advised that the proposed design of the well presented above is
based on knowledge at the time of writing of these specifications. Although no
significant changes are anticipated, the final design of the well may be altered based
on the current conditions at the site as determined from the pilot hole drilling and the
new geophysical survey.
SECTION 107 - OTHER WORK REQUIRED
In addition to the work described in Section 106, the Contractor will be responsible
for other work that will be required during the construction of the well. The
Contractor shall prepare the site in a manner as to provide adequate work space, safe
working conditions, and sufficient containment and storage of drilling cuttings and
fluids.
Fluids displaced during casing installation, gravel packing, and sealing
operations shall be contained and removed from the site along with the
initial development fluids. Water produced during subsequent development
operations and during testing shall be routed to baffled settling tanks for the settling
of solids. After the solids have settled, the water may be discharged. The OTR will
notify the Contractor of the discharge point during the preconstruction meeting.
Technical Provisions
Cabrillo College
Replacement Well No. 4
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The Contractor shall convey all water produced from the well during the final stages
of development and during the production testing through closed pipe to the point of
discharge. The point of discharge is approximately 100 feet from the location of the
new well. A possible site layout is presented on Figure 2.
SECTION 108 - SERVICES FURNISHED BY COLLEGE
Upon completion of the geophysical survey, the OTR shall confirm the final well
design to the Contractor. This shall include total casing depth and well screen
placement, gravel pack design, and the depth of cement seal.
SECTION 109 - WATER SUPPLY FOR CONSTRUCTION
Water supply for well drilling and construction will be made available at no cost by
College. The source of water is from the College’s system near the site of the old
well. The Contractor is responsible for connection to the system and conveyance of
water to point of use.
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Technical Provisions
Cabrillo College
Replacement Well No. 4
CABRILLO COLLEGE
REPLACEMENT WELL NO. 4
CONSTRUCTION MATERIALS AND METHODS
Section 200 - Mobilization
Section 201 - Conductor (Surface) Casing
Section 202 - Pilot Bore Drilling
Section 203 - Geophysical Logging
Section 204 - Reaming Pilot Bore
Section 205 - Caliper Survey
Section 206 - Well Casings and Screens
Section 207 - Gravel Pack
Section 208 - Cement Grout
Section 209 - Standby Time
Section 210 - Mechanical Well Development
Section 211 - Furnish and Install/Remove Pump
Section 212 - Pumping Well Development
Section 213 - Production Testing
Section 214 - Acceptance Video
Section 215 - Disinfection
Section 216 - Site Cleanup
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Technical Provisions
Cabrillo College
Replacement Well No. 4
SECTION 200
MOBILIZATION
Bid Item No. 1
SECTION 200-1 - SCOPE
This item shall include: the transportation of personnel, equipment, and operating
supplies to and from the site; site preparation; establishment of portable sanitary
facilities; provision for the installation and removal of fluid and cutting storage and
containment, construction of discharge lines; and other preparatory work at the site
for work required by the Contractor. Mobilization will also include acquisition of
permit to construct well from County of Santa Cruz Environmental Health
Department.
The Contractor shall provide a complete drilling unit, all tools, accessories, power,
fuel, materials, supplies, lighting, and other equipment and experienced personnel
necessary to conduct efficient drilling operations. The drilling unit shall be in good
condition and of such capacity as to drill the hole and complete a well as required by
these Specifications to a depth of approximately 1000 feet.
SECTION 200-2 - MEASUREMENT AND PAYMENT
Total payment for mobilization will be regardless of actual cost to the Contractor.
Payment will not be made under this item for the purchase cost of materials having a
residual value, or the purchase costs of operating supplies.
Payment for Bid Item No. 1 "Mobilization" will constitute full compensation for all
labor, materials, permits, equipment, and all other items necessary and incidental to
completion of the work.
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Technical Provisions
Cabrillo College
Replacement Well No. 4
SECTION 201
CONDUCTOR (SURFACE) CASING
Bid Item No. 2
SECTION 201-1 - SCOPE
Prior to actual drilling of the pilot hole, the contractor shall bore a minimum 24-inch
diameter hole from ground surface to a depth of 50 feet, or as directed by the OTR,
in which a surface conductor casing shall be installed. The conductor casing will
serve as sanitary seal, provide near surface hole stability, and convey drilling fluids
and cuttings safely to the surface.
SECTION 201-2 - MATERIAL REQUIREMENTS
The conductor casing shall be a 20-inches O.D. steel pipe having a wall thickness of
not less than 1/4-inch and a length of not less than 50 feet (from ground surface).
Conductor casing shall be manufactured in accordance with ASTM Designation A-139,
Grade B, without copper. All joints in the conductor casing shall be securely welded
and shall be watertight. Field joints (if required) shall be either collared or butt
welded. Centering guides shall be welded to the conductor casing with a minimum of
two sets of guides (one near the bottom and one near the top). Each set will consist
of three guides equally spread circumferentially.
After the conductor has been installed, it shall be sealed by filling the annular space
between the hole and the conductor with standard pumping mix concrete that meets
permit conditions. The Contractor must use a construction tremie or tube placed to
bottom of the sealing zone. Upon completion of cementing, concrete shall be visible
above the surface of the ground outside the conductor casing. After cementing
operations has been completed, the concrete shall be left undisturbed for a period of
not less than 12 hours, or as directed by the OTR, before drilling is resumed. It is the
responsibility of the contractor to notify the permitting authority for inspection of the
annular seal, if required.
All field welding shall be performed in accordance with American Welding Society
Standards.
SECTION 201-3 - MEASUREMENT AND PAYMENT
The 20-inch minimum diameter surface conductor casing will be paid for on a per
linear foot basis, constructed in-place.
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Cabrillo College
Replacement Well No. 4
SECTION 202
PILOT BORE DRILLING
Bid Item No. 3
SECTION 202-1 - SCOPE
This item includes the drilling of a pilot bore at the site to a depth of approximately
830 feet. The final depth of the pilot bore will be determined by the OTR. The pilot
bore shall be drilled using the either direct or reverse rotary methods.
SECTION 202-2 - CONSTRUCTION MATERIALS
The Contractor must provide a description of the drilling method and fluids to be
submitted at the request of the OTR. The contractor must meet drilling fluid
requirements at all times during drilling. Drilling with clear water only will not
be allowed. The proposed drilling fluid program must include information regarding
the types of fluid to be used, intended drilling fluid weights, viscosities, sand and
solids contents, water loss control, and the name of the drilling fluid supplier.
Only fresh water shall be used in the drilling fluid. All water used during drilling shall
meet California State Department of Public Health standards for safe drinking water.
The drilling fluid shall possess such characteristics as are required to adequately
maintain the walls of the hole to prevent caving of the wall as drilling progresses and
to permit recovery of representative samples of cuttings. The drilling fluid shall
possess such characteristics that it can be readily removed from the hole during the
placement of the gravel pack and during development of the well.
The drilling fluid shall be a polymer system such as, but not limited to, Easy-Mud,
HEC, Drispack, Duel-Vis, Poly-Bore, AquaPak, or Wyo-Ben G-150, etc. A clay-based
bentonite system will not be allowed. The properties specified below must be
maintained to the satisfaction of the OTR. The Contractor is advised that excessive
water loss in clay zones can lead to swelling, loss of shear strength, substantial
caving, and hole stability problems. The drilling fluid to be utilized should contain
properties to inhibit this possibility.
The drill rig must be provided at all times with the following Standard API drilling fluid
devices to measure the following properties:
A.
B.
C.
D.
Drilling fluid weight;
Drilling fluid viscosity; and,
Drilling fluid sand content.
Water Loss
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Cabrillo College
Replacement Well No. 4
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The drilling fluid shall have the following properties in accordance with API Code RP13B (or recent modification) "Recommended Standard Procedure for Testing Drilling
Fluids." In the event the Contractor cannot attain these properties, the mud shall be
modified or replaced.
The following properties for polymer based fluid systems shall be maintained.

Weight - a maximum of 9.0 pounds per gallon during all aspects of drilling.

Marsh Funnel Viscosity – a minimum of 32 seconds during all aspects of drilling.

Sand Content - a maximum of one percent by volume during all aspects of drilling
(special note: this testing procedure shall include the addition of sodium
hypochlorite to the test sample in order to destroy polymers).

Water Loss – less than 20 cc.
Proper control of the drilling fluid must be maintained to the satisfaction of the OTR,
and the Contractor may be required, at the Contractor's expense, to retain or employ
an experienced, qualified Mud Engineer on the job to supervise and maintain drilling
fluid characteristics to the satisfaction of the OTR. A Mud Engineer will be required
should the mud properties described above not be met.
For reverse-rotary drilling, in the absence of mechanical separation such as shakers
and desanders, the contractor must possess and maintain at all times during the
process, sufficient surface volume to effectively separate cuttings and keep sand and
solids contents below the specified limits. Excavation of on-site pits for drilling
fluids will not be allowed. If drilling fluid conditions as outlined above are
exceeded, the Contractor will be required to immediately suspend further drilling until
corrected. Contractor is advised that cuttings from shaker or those removed from pit
will need to be stored and contained in the staging area for eventual removal.
Contractor may choose to utilize “low-boy” bins for cuttings.
Upon completion of drilling operations and well construction and initial development,
all fluids shall be contained and removed from the site and legally disposed of at the
Contractor's expense. Cuttings can be stockpiled at a location designated by the OTR
and left on-site.
SECTION 202-3 - CONSTRUCTION RECORDS
Contractor must keep records providing the following information:

A log of drilling bit types and depths of changes.
Technical Provisions
Cabrillo College
Replacement Well No. 4

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A record of drilling fluid properties at 4-hour intervals. The record shall show
mud weights, Marsh funnel viscosity, sand content, solids content, water
additions, and any drilling fluid additives used.
During drilling of the pilot bore, at 10-foot or less intervals, or as directed by the
OTR, the Contractor shall take representative samples of drill cuttings from the
interval and shall place cuttings in suitably labeled sample containers supplied by the
Contractor. All sample containers shall be labeled to indicate the depth interval,
date, and well number of the collected sample. The samples shall be properly stored
by the Contractor in a manner as to prevent breakage or loss until they are accepted
by the OTR.
Upon completion of the pilot bore for the well, geophysical logging of the hole shall be
conducted for the purpose of providing information for the final design of the well.
The geophysical logging is described in Section 203. Determination of the final depth
of the reamed pilot borehole shall be made after completion of the geophysical
logging.
SECTION 202-4 - MEASUREMENT AND PAYMENT
Payment for the pilot bore drilling will be made on a linear foot basis at the unit price
bid. Pilot bore footage will begin at the base of the conductor casing. Such payment
will be considered full compensation for furnishing all labor, materials, tools and
equipment necessary and incidental to complete each pilot bore.
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Cabrillo College
Replacement Well No. 4
SECTION 203
GEOPHYSICAL LOGGING
Bid Item No. 4
SECTION 203-1
-
SCOPE
This item shall include the performance of a geophysical log of the pilot bore. The
geophysical log shall include spontaneous potential and resistivity surveys.
SECTION 203-2
-
CONSTRUCTION METHODS
The Contractor shall furnish and provide assistance for geophysical logging of the
pilot hole. The geophysical log shall include SP, natural gamma and resistivity
surveys, and shall be performed as directed by the OTR. If the logging probe fails to
descend to the desired depth, the Contractor, at his own expense, shall condition the
hole to permit the logging probe to descend to the bottom of the hole. Standby time
will not be paid for additional cleaning and conditioning of the hole to enable logging
operations to proceed. A record copy of the geophysical log shall be delivered to the
OTR immediately upon completion.
SECTION 203-3
-
MEASUREMENT AND PAYMENT
Geophysical logging of the pilot bore shall be paid on a lump sum basis. Payment
shall be considered full compensation for all labor, tools, equipment and insurance
and doing all work necessary and incidental to completion of the task, including
standby time. If the OTR requests in writing additional logging, the Contractor shall
be paid for the additional logging at subcontractor cost plus 10 percent, and hourly
standby at the same hourly standby rate as bid.
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Cabrillo College
Replacement Well No. 4
SECTION 204
REAMING PILOT BORE
Bid Item No. 5
SECTION 204-1
-
SCOPE
This item shall include the reaming of the pilot bore, as specified.
SECTION 204-2
-
CONSTRUCTION METHODS
After completion, the pilot bore will be reamed with an 18-inch diameter bit to a
depth of 825 feet, or as determined by the OTR. Drilling fluid properties during the
pilot hole ream must conform to those specified in Section 202-2.
SECTION 204-3
-
MEASUREMENTS AND PAYMENT
Payment for reaming the pilot hole to the specified diameter shall be made on a per
linear foot basis. Payment shall be considered full compensation for furnishing all
labor, materials, tools, and equipment necessary and incidental to completion of the
work.
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Cabrillo College
Replacement Well No. 4
SECTION 205
CALIPER SURVEY
Bid Item No. 6
SECTION 205-1
-
SCOPE
If upon completion of final ream, a caliper survey shall be performed to assess the
condition of the borehole and estimate the volumes of cement and gravel pack
required.
SECTION 205-2
-
CONSTRUCTION METHODS
The Contractor shall furnish professional logging services for the caliper survey of the
borehole. The caliper tool shall have the ability to measure borehole diameters to 48
inches. A record copy of the Caliper Survey shall be delivered to the OTR upon
completion of the log.
SECTION 205-3
-
MEASUREMENT AND PAYMENT
Caliper surveying of the reamed borehole shall be paid on a lump sum basis. Payment
shall be considered full compensation for all labor, tools, equipment, insurance, and
doing all work necessary and incidental to completion of the task including standby
time.
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Cabrillo College
Replacement Well No. 4
SECTION 206
WELL CASINGS AND SCREENS
Bid Item Nos. 7 through 11
Quantity
(Linear
Feet).
270
270
90
90
450
450
10
10
265
Item
8-inch Dia. SDR 17 PVC BLANK CASING Bell/Spigot
8-inch Dia. SDR 17 PVC BLANK CASING Certainteed
8-inch Dia. SDR 22 PVC BLANK CASING Bell/Spigot
8-inch Dia. SDR 22 PVC BLANK CASING Certainteed
8-inch Dia. SDR 22 PVC WELL SCREEN WITH 0.050inch SLOTS Bell/Spigot
8-inch Dia. SDR 22 PVC WELL SCREEN WITH 0.050inch SLOTS Certainteed
8-inch Dia. SDR 22 PVC BLANK CELLAR AND CAP
Bell/Spigot
8-inch Dia. SDR 22 PVC BLANK CELLAR AND CAP
Certainteed
2- INCH-DIAMETER, MILD STEEL GRAVEL TUBE
SECTION 206-1
-
Bid
Item
No
7a
7b
8a
8b
9a
9b
10a
10b
11
SCOPE
This item shall consist of providing and installing casing, screen, cellar pipe and cap,
and tremie pipe in the well as specified. Two variants on well design are to be bid one of conventional bell and spigot glued joints (Alternative A - Bid Items 7a-10a) the
other "Certainteed" type mechanical joints (Alternative B - Bid Items 7b-10b).
Alternate A- 8-inch Dia. SDR 17 PVC BLANK CASING Bell/Spigot
- 8-inch Dia. SDR 22 PVC BLANK CASING Bell/Spigot
- 8-inch Dia. SDR 22 PVC WELL SCREEN WITH 0.050-inch SLOTS Bell/Spigot
- 8-inch Dia. SDR 22 PVC BLANK CELLAR AND CAP Bell/Spigot
Alternate
-
B8-inch
8-inch
8-inch
8-inch
Dia.
Dia.
Dia.
Dia.
SDR
SDR
SDR
SDR
17
22
22
22
PVC
PVC
PVC
PVC
BLANK CASING Certainteed
BLANK CASING Certainteed
WELL SCREEN WITH 0.050-inch SLOTS Certainteed
BLANK CELLAR AND CAP Certainteed
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Replacement Well No. 4
SECTION 206-2
-
CONSTRUCTION MATERIALS
Casing material is PVC. All plastic casing shall meet the provisions of National
Sanitation Foundation Standard No. 14, Plastic Piping Components and related
Materials and any revision thereof. The casing shall be marked or labeled following
requirements in NSF Standard No. 14. Standard No. 14 includes the requirements of
ASTM F480. All casing materials shall be new.
Plastic casing may be joined by solvent welding or mechanically joined by threads or
other means, depending on the type of material and its fabrication. Solvent cement
used for solvent welding shall meet specifications for the type of plastic casing used.
Solvent cement shall be applied in accordance with solvent and casing manufacturer
instructions. Particular attention shall be given to instructions pertaining to required
setting time for joints to develop strength.
The following specifications for solvent cements and joints for PVC casing shall be
met, including the latest revisions thereof:
a. ASTM D2564, Standard Specification for Solvent Cements for Poly (Vinyl
Chloride) (PVC) Plastic Pipe and Fittings.
b. ASTM D2855, Standard Practice for Making Solvent-Cemented Joints with Poly
(Vinyl Chloride) (PVC) Pipe and Fittings.
Plastic casing or screen shall not be subjected to excessive stress during installation
and shall not be driven into place. Care shall be taken to ensure that plastic casing
and joints are not subjected to excessive heat from cement-based sealing material.
SECTION 206-2.1 -
BLANK WELL CASING – SDR-17 PVC
The uppermost blank casing shall be 8-inch diameter in size SDR-17 PVC pipe in
accordance with ASTM standard F480. The thickness shall be adequate to protect
against collapse.
SECTION 206-2.2 -
BLANK WELL CASING – PVC
The lower blank casing and the interval between screened intervals shall be 8-inch
diameter SDR-21 PVC consistent with ASTM standard F480. The thickness shall be
adequate to protect against collapse.
SECTION 206-2.2 -
WELL SCREEN
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Cabrillo College
Replacement Well No. 4
Well screen shall be 8-inch diameter SDR-21 PVC machine slotted manufactured in
accordance with ASTM standard F480. Slot size shall be 0.050 inch. Minimum open
area shall be 35 square inches per foot of screen.
SECTION 206-2.3 -
CELLAR PIPE AND END CAP
The cellar pipe shall be 8-inch diameter SDR-21 PVC and 10 feet in length. The
bottom will be equipped with an end cap.
SECTION 206-2.4 -
GRAVEL TUBE
A permanent gravel tube shall be installed. The gravel tube shall be constructed of
2-inch diameter mild steel and shall extend to a depth of approximately 265 feet.
SECTION 206-3
-
CONSTRUCTION METHODS
Upon completion of reaming the pilot bore, the Contractor shall install the permanent
tremie pipe, the well screen and the casing as designed by the OTR. The preliminary,
proposed design of the well is shown on Figure 3 - Preliminary Well Design.
A construction tremie pipe will be used to install gravel, and shall be installed to
depth prior to installation of the well screen and casing. The permanent gravel tube
shall also be installed prior to installation of the well screen and casing, to a depth of
approximately 265 feet. The top of the permanent tremie pipe shall ultimately
extend 12 inches above ground surface and shall be equipped with a screw-on cap.
The 8-inch casing shall be plumb and shall be centered in the hole. Centralizers with
120-degree spacing, attached directly to the 8-inch casing at intervals of not more than
80 feet, shall be provided in order to center and hold the casing in the proper position
until the gravel is in place. Regardless of spacing interval specified above, centralizers
will be installed at top and bottom of all screen intervals. Casing centralizers shall be
placed up to a depth of approximately 20 feet below ground surface. The casing shall
be suspended in tension from the surface by means of an appropriate hanger or clamp.
The use of float plugs to land and set casing will not be permitted.
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Replacement Well No. 4
Figure 3 - Preliminary Well Design
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Replacement Well No. 4
If, for any reason, the casing cannot be landed in the correct position or at a depth
acceptable to the OTR, or any of the casings should collapse prior to well completion,
the Contractor shall construct another well immediately adjacent to the original
location and complete this well in accordance with the Specifications at no additional
cost to College. The abandoned hole shall be sealed in accordance with directions
from College and in accordance with any laws pertaining to proper well destruction.
All work required to be repeated and all additional materials, labor and equipment
required, shall be furnished at the expense of the Contractor and no claim for
additional compensation shall be made or allowed, except as specifically provided
herein.
SECTION 206-4
-
MEASUREMENT AND PAYMENT
Payment for furnishing and installing the well casing and screen shall be made on a
linear foot basis at the unit price bid. Payment shall be considered full compensation
for furnishing all labor, materials, tools and equipment necessary and incidental to
completion of the work.
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SECTION 207
GRAVEL PACK
Bid Item No. 12
SECTION 207-1-SCOPE
This item shall consist of providing and installing gravel or coarse-grained sand, as
specified by the OTR, adjacent to the screen intervals in the annulus of the well.
SECTION 207-2
-
CONSTRUCTION MATERIALS
All gravel or coarse-grained sand for packing shall be well-rounded, hard, waterworn, and washed clean of silt, find sand, dirt, and foreign matter. Crushed gravel
will not be accepted. Gravel shall be of the type provided by the RMC Pacific
Materials or SRI Supreme, or equal, and shall consist of an 8 x 16 gradation and
subject to the approval of the OTR prior to delivery. A sample and sieve analysis of
gravel packing materials to be delivered to the site must be submitted for approval to
the OTR prior to placement of the material in each well. The OTR at his expense may
elect to have a certified testing laboratory perform a sieve analysis to verify
conformance with approved sample. Failure of the gradation of the approved sample
shall be grounds for rejection. The gravel shall be delivered in ‘supersack’ containers.
SECTION 207-3
-
CONSTRUCTION METHODS
Prior to placement of the gravel pack in the well, the annular fluid shall be thinned
with clean water to reduce viscosity. The Contractor shall submit an estimate of the
volume of gravel to be installed, and shall provide to the OTR an accounting of the
total volume of gravel used once gravel-packing operations are complete. If a
significant difference exists between the estimate and the final volume of gravel
added, the discrepancy may be grounds for rejection of the well by the OTR.
Gravel, as specified, shall be installed in the annular space between the reamed hole
and the well screen through a construction tremie pipe. The Contractor shall add
disinfectant (see Section 213) to the gravel pack while gravel packing. The use of
water and a gravel pump is recommended. Fluids displaced from the well casing
and annulus during gravel packing (and sealing) operations shall be
controlled and discharge to temporary storage for off-site disposal. It is the
Contractor's responsibility to verify the depth to the gravel pack in the annulus at all
times during the gravel packing operations by using a sounding line, or some other
acceptable method.
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Technical Provisions
Cabrillo College
Replacement Well No. 4
SECTION 207-4
-
MEASUREMENT AND PAYMENT
Payment for furnishing and installing the gravel envelope shall be made on a linear
foot basis at the unit price bid.
Payment shall be considered full compensation for furnishing all labor, materials,
tools and equipment necessary and incidental to completion of the work.
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Technical Provisions
Cabrillo College
Replacement Well No. 4
SECTION 208
CEMENT GROUT
Bid Item No. 13
SECTION 208-1
-
SCOPE
This item shall consist of providing and installing cement grout in the well. As
preliminarily designed, seal will extend from the surface to a depth of 250 feet.
Actual depth will be determined upon review of geophysical log.
SECTION 208-2
-
CONSTRUCTION MATERIALS
Sealing material shall be limited to those materials allowed under DWR Bull. 74-81
and approved by Santa Cruz County EHD. Contractor is encouraged to add
retardant and or bentonite (up to 5%) to sealing material to reduce the heat
of hydration. Contractor is also encouraged to keep casing full of fluid
during sealing operations and curing. Risk of casing collapse will be borne
solely by Contractor.
SECTION 208-3
-
CONSTRUCTION METHODS
Cement grout shall be injected in the annular space between the inner casing and the
borehole from bottom to top by means of a tremie pipe. Cement grout material shall
be placed by a positive displacement method using pumping. A grout pipe shall
extend from the surface to the bottom of the zone to be grouted. Grout shall be
placed, from bottom to top, in a single operation. The grout pipe may be slowly
raised as the grout is placed but the discharge end of the grout pipe must be
submerged in the emplaced grout at all times until grouting is completed. The grout
pipe shall be maintained full, to the surface, at all times until completion of the
grouting of the entire specified zone. The fluid level in the casing shall be maintained
at the ground surface during cementing operations and during curing. After
cementing, no work will be undertaken for a period of 18 hours or as allowed by OTR.
It is the responsibility of the contractor to notify the permitting authority for
inspection of the annular seal, if required.
SECTION 208-4
-
MEASUREMENT AND PAYMENT
Payment for cement grout will be made on a linear foot basis at the unit price bid.
Payment shall include full compensation for furnishing all labor, materials, tools, and
equipment necessary and incidental to complete the installation in place.
26
Technical Provisions
Cabrillo College
Replacement Well No. 4
SECTION 209
STANDBY TIME
Bid Item No. 14
SECTION 209-1
-
SCOPE
During the progress of drilling operations, it may be necessary for the OTR to perform
work that will require the drilling crew and equipment to stand idle. In such event,
the OTR shall request the Contractor in writing to cease operations and shall state the
anticipated extent or duration thereof. As necessary, the Contractor shall furnish
reasonable rig assistance as directed by the OTR.
SECTION 209-2
-
MEASUREMENT AND PAYMENT
Payment for standby time as requested by the OTR shall be paid at the hourly rate
bid and in accordance with the actual hours as approved by the OTR. No further
compensation will be allowed.
27
Technical Provisions
Cabrillo College
Replacement Well No. 4
SECTION 210
MECHANICAL WELL DEVELOPMENT
Bid Item No. 15
SECTION 210-1
SCOPE
This item shall consist of bailing, air-lifting, and zone-pumping to remove drilling
fluids and cuttings and develop the gravel pack and aquifer to maximize the yield and
efficiency of each well.
SECTION 210-2
MECHANICAL DEVELOPMENT PROCEDURES
Initial development work shall consist of air-lifting heavy fluid from casing. Air-lifting
shall be performed with open pipe progressively to bottom. Air-lift pipe shall be used
as an eductor with airline inserted into the air-lift pipe to effect air-lift pumping.
Direct injection of air into casing will not be allowed. After removal of heavy fluids
and diversion of these fluids to on-site storage, air-lift pipe shall be removed and
fitted with a swab to continue development.
After bailing, the well will be developed by swabbing while air-lifting. A minimum 7inch diameter open-ended swab shall be used on the end of string of pipe which will
serve as an eductor for air-lifting. Swabbing/airlifting shall progress from top of the
screen interval to bottom. Airline shall be added as necessary as depth increases.
Discharge from the airlift head shall be configured to divert water mixture through a
flexible hose to a discharge tank. The entire assembly shall be suspended in the
derrick in such a manner that allows the assembly to swab a minimum of 20 feet of
screen while simultaneously air-lift pumping. Each 20-foot screen section will be
worked until successive swabbing produces little change in color and discharge is
relatively clear. Development will continue for approximately 30-minutes for each
20-foot interval of screen. This period may be extended or shortened by the OTR
based on condition of discharge water. Upon completion of a screen section,
additional pipe will be added, and the procedure repeated until all screen sections
have been completed in a pass from the top of the screen to the bottom.
After reaching bottom, the development tools shall be utilized to inject Johnson NW220, or approved equal, incrementally into the screen sections, as the swab assembly
is raised to the top of the screened interval. The total amount of NW-220 introduced
to the well shall be equal to the quantity necessary to achieve a NW-220
concentration of one gallon per 500 gallons of water in the screened sections. The
NW-220 solution shall be swabbed into each progressively shallower screen section as
piping is removed. Each 20-foot screen section shall be swabbed for a period of up to
10 minutes to assure distribution. Upon reaching the uppermost screen section, the
development tools would be left in the well for a minimum period of 8 hours. After
28
Technical Provisions
Cabrillo College
Replacement Well No. 4
this period, the pumping/swabbing development procedure described in the
preceding paragraphs shall be repeated to bottom (second pass). Development tools
would then be removed from well. It is estimated that total mechanical development
time will be approximately 30 hours.
Discharge Water/Treatment System. All piping and discharge lines shall be
provided by the Contractor. It is recommended that Contractor provide at least three
temporary holding tanks of at least 20,000 gallons each (e.g., Baker tanks) for fluid
containment and treatment. Initial development water shall be directed to on-site
tankage for eventual off-site disposal. After displacement of initial development
water, water from the well shall be directed to two tanks located in the staging area
to allow settlement of all solids prior to discharge of decanted water. A biodegradable
flocculent (Chitosan or equivalent) shall be added by means of chemical injection
pump upstream of the first tank. The tanks shall be connected in series and
internally baffled to maximize the settling of solids. After passing through treatment
tanks, water shall be routed to the point of discharge in closed pipe. Erosion control
shall be provided at point of discharge.
SECTION 210-3
MEASUREMENT AND PAYMENT
Payment for well development, including bailing, airlifting, and zone pumping, will be
made on an hourly basis in accordance with Bid Item 15. Approximately 30 hours of
mechanical well development time is anticipated. Such payment shall be considered
as full compensation for furnishing all labor, materials, tools, and equipment
necessary and incidental to completion of this task.
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Technical Provisions
Cabrillo College
Replacement Well No. 4
SECTION 211
FURNISH AND INSTALL AND REMOVE TEST PUMP
BID ITEM No. 16
SECTION 211-1
SCOPE
This item shall consist of furnishing, installation, and removal of test pump. This item
includes required piping to route discharge water to discharge location.
SECTION 211-2
FURNISH AND INSTALL TEST PUMP
The Contractor shall furnish, install, and remove the necessary equipment capable of
pumping up to 300 gpm with a pumping level of up to 500 feet. The pump setting
depth will be provided by the OTR. The equipment shall have satisfactory throttling
devices so that the discharge may be reduced to 60 gpm. The pumping unit shall be
complete with sufficient power source, controls, and appurtenances and shall be capable
of being operated without interruption for a period of 24 continuous hours. The
discharge line shall be provided with a gate valve, flow meter and suitable equipment
for sand testing such as the Rossum Centrifugal Sand Sampler (refer to Journal of the
American Water Works Association, Vol. 46, No. 2, February 1954).
Contractor will also install two minimum 3/4-inch diameter sounding tubes to the
pump for use for water level data collection by both sounder and instrumentation.
SECTION 211-3
MEASUREMENT AND PAYMENT
Payment for installation of all pumping equipment and discharge pipe for
development and testing shall be included in the lump sum price paid for Bid Item 16.
30
Technical Provisions
Cabrillo College
Replacement Well No. 4
SECTION 212
PUMPING WELL DEVELOPMENT
Bid Item No. 17
SECTION 212-1
SCOPE
This item consists of the use of the test pump installed per Section 211 to further
development.
SECTION 212-2
DEVELOPMENT PUMPING PROCEEDURES
After installation of the test pump, development shall be continued by pumping the
well intermittently; pumping the well for approximately 10 to 15 minutes, followed by
periods of approximately 2 to 5 minutes during which no pumping will occur. The
discharge rate will be determined by the OTR.
Development records shall be maintained on at least a one-half-hour basis showing
production rate, pumping level, drawdown, sand production, and all other pertinent
information concerning well development. Development pumping rate shall continue
until the following conditions have been met, or as directed by the OTR:
1)
Surging no longer results in significant color or sand in the discharge water.
2)
There shall be no settlement of the gravel pack.
3)
The specific capacity (gallons per minute per foot of drawdown) shall have
reached a relatively constant value over a period of at least 2 hours.
4)
Sand content is no greater than 5 ppm measured 15 minutes after surging.
SECTION 212-3
DISCHARGE WATER
Discharge water produced during development pumping shall be conveyed to
treatment system until discharge is clear. It is the Contractor's responsibility to
ensure that no leaks occur through the pipe, and no flooding or erosion occurs.
SECTION 212-4
MEASUREMENT AND PAYMENT
Payment for pumping development will be made on an hourly basis. Approximately
16 hours of well development time is anticipated. Such payment shall be considered
as full compensation for furnishing all labor, materials, tools, and equipment
necessary and incidental to completion of this task.
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Cabrillo College
Replacement Well No. 4
SECTION 213
PRODUCTION TESTING
Bid Item No. 18
SECTION 213-1
SCOPE
These items shall consist of testing the well to determine the optimum rate of pumping
and shall include a step drawdown and constant discharge test.
SECTION 213-2
STEP DRAWDOWN TEST
Prior to starting the step drawdown test, water level measurements shall be made to
assess the static water level. As part of the step drawdown and constant discharge test,
the OTR will independently install a downhole pressure transducer below the pump
intake to record water level variations. There shall be a period of at least 8 hours of no
pumping prior to initiation of the test conditions following development work and prior to
the start of the step drawdown test.
The well shall be "step" tested at rates of approximately 60, 120, 180 and 240 gpm.
The complete test for the well is estimated to require approximately 8 hours. The
Contractor shall operate the pump and change the discharge as directed by the OTR.
Discharge of the pump shall be controlled by a gate valve, if electric driven, and both
gate valve and engine throttle, if engine driven. The discharge shall be controlled and
maintained at approximately the desired discharge for each step with an accuracy of
plus or minus five percent. Pump discharge shall be measured with a totalizing meter
and stopwatch, circular orifice meter, or Venturi meter as approved by the OTR. An
electric sounder shall be furnished by the Contractor. Sand content measurement shall
be recorded at 15-minute intervals by the Contractor during the step drawdown test.
SECTION 213-3
CONSTANT DISCHARGE TEST
After an 16-hour recovery period from the step-drawdown test, a constant discharge
test shall be conducted by pumping the well at the design rate for a period of not less
than 24 hours or until the OTR terminates the test. A recovery period of 12 hours
shall follow the termination of the constant discharge test. During the constant
discharge test, the final sand content testing will be conducted by the Contractor.
The sand content shall be determined by averaging the results of samples collected at
the following times during the final pumping test: 1) five minutes after start of test;
2) after 1/4 of the total planned test time has elapsed; 3) after one-half of the time
has elapsed; 4) after 3/4 of the time has elapsed; and 5) near the end of the
pumping test. If the sand content exceeds five parts per million, the Contractor shall
do the necessary redevelopment work of the well until the sand content is less than
five parts per million, as directed by the OTR.
SECTION 213-4
ABORTED TEST
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Technical Provisions
Cabrillo College
Replacement Well No. 4
Should the pumping operations cease for a period greater than one percent of the
elapsed pumping time during the tests, the test may, subject to discussions with
OTR, be suspended until "complete" recovery of the water level occurs. Recovery
shall be considered "complete" after the well has been allowed to rest for a period at
least equal to the elapsed pumping time of the aborted test, or until any three
successive water level measurements spaced at least 20 minutes apart show no
significant, further rise in the water level in the pumped well. The OTR shall be the
sole judge as to whether this latter condition exists. The Contractor will not be paid
for any retesting done if the specified time or other recovery requirements for the
aborted test are not first met. Retesting performed under such circumstances will not
be considered to be a valid test.
SECTION 213-5
DISCHARGE WATER
Discharge water produced during the testing shall be conveyed through closed pipe to
the point of discharge. It is the Contractor's responsibility to ensure that no leaks
occur through the pipe, and no flooding or erosion occurs. Energy dissipation
accommodations are recommended to prevent scour.
SECTION 214-6
-
RECORDS
The Contractor shall keep accurate records of each pumping test and furnish copies of
all records to the OTR or his representative upon completion of the test. The records
shall also be available to the OTR or his representative for inspection at any time
during the test. The records to be maintained by the contractor shall include water
level measurements, discharge rate measurements, sand test results, and any other
pertinent information.
SECTION 213-7
-
MEASUREMENT AND PAYMENT
Payment for the production tests will be made at the hourly rate bid. The estimated
bid quantity for these tests assumes a total of 32 hours. Such payment will be
considered as full compensation for furnishing all labor, materials, tools and
equipment necessary and incidental to completion of these tasks.
33
Technical Provisions
Cabrillo College
Replacement Well No. 4
SECTION 214
ACCEPTANCE VIDEO
Bid Item No. 19
SECTION 214-1
-
SCOPE
This item will consist of performing a video survey of the completed well. The video
survey will provide a basis for assessing the condition of the completed well.
SECTION 214-2
-
VIDEO SURVEY
The contractor shall furnish and provide assistance for the video surveying of the
completed well prior to acceptance of the well by the District. A pdf report of the
video survey and a record copy of the video survey shall be delivered to the OTR
upon completion of the survey.
SECTION 214-4
-
MEASUREMENT AND PAYMENT
Payment for the video survey of the well will be made on a lump sum basis. Such
payment shall be considered full compensation for furnishing all labor, materials,
tools and equipment and doing all of the work to complete this task.
34
Technical Provisions
Cabrillo College
Replacement Well No. 4
SECTION 215
DISINFECTION
Bid Item No. 20
SECTION 215-1
-
SCOPE
This item will consist of disinfecting the well against bacteria.
SECTION 215-2
-
DISINFECTANTS
Chlorine approved by state or local regulatory agencies shall be used as a
disinfectant. The disinfectant shall be delivered to each work site in original closed
containers bearing the original label indicating the percentage of available chlorine.
Dry, granule, HTH calcium hyperchlorite is considered an acceptable disinfectant.
The disinfectant shall be recently purchased. Chlorine compounds in dry form shall
not have been stored for more than one year. During storage, disinfectants shall not
be exposed to the atmosphere or to direct sunlight. Unless superseded by
governmental regulation, the quantity of chlorine compounds used for disinfection
shall be sufficient to produce a minimum of 100 parts per million available chlorine in
solution when mixed with the total volume of water in the well.
SECTION 215-3
-
DISINFECTION METHODS
The disinfecting agent shall be uniformly applied throughout the entire water depth of
the well by use of a bailer. Bailer shall be less than 6-inhes in diameter. The
dispersion of the disinfectant shall be assisted by pouring into the well a volume of
water equal to the volume of water contained in the well, after the disinfectant has
been emplaced. This will cause the disinfectant to flow out of the well into the area
adjacent to the screen. After applying disinfection agent to well will be bailed such
that disinfection solution is brought to the surface and then released down the well
casing to maintain those portions of the well above the water table in a damp
condition with water containing the required concentration of disinfecting agent for a
period of not less than 20 minutes. The disinfecting agent shall be left in the well for
a period of at least 12 hours.
SECTION 215-4
-
MEASUREMENT AND PAYMENT
Payment for the disinfection of the well will be made on a lump sum basis. Such
payment shall be considered full compensation for furnishing all labor, materials,
tools and equipment and doing all of the work to complete this task.
35
Technical Provisions
Cabrillo College
Replacement Well No. 4
SECTION 216
SITE CLEANUP
Bid Item No. 21
SECTION 217-1
-
SCOPE
This item shall consist of maintaining the well site in a professional manner during
drilling, construction, and restoring the site to pre-drilling conditions after work is
completed. The Contractor shall be responsible for the removal and proper
disposal of fluids displaced from the hole during well construction and initial
development. Contractor is also responsible for moving cuttings to the
designated on-site disposal area. Contractor shall take provisions to control
fluids at the cuttings disposal site.
SECTION 217-2
-
CLEANUP METHOD
The Contractor shall keep the premises free from accumulations of waste materials,
rubbish, and other debris resulting from the work. At completion of the work, he
shall remove all waste materials, rubbish and debris from and about the well site as
well as all tools, construction equipment, fuel tanks, and machinery and surplus
materials. The Contractor shall restore all temporary work areas to their original
condition. The Contractor is responsible for any damages to properties adjacent to
the well caused by drilling, construction, or well testing activities associated with the
work described herein.
SECTION 217-3
-
MEASUREMENT AND PAYMENT
Payment for site will be made on a lump sum basis after inspection by a College
representative and upon final approval by College of all work completed by the
contractor.
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Technical Provisions
Cabrillo College
Replacement Well No. 4
CABRILLO COLLEGE- REPLACEMENT WELL NO. 4
BID FORM
Item
No.
Estimated
Quantity
Unit of
Measure
Item
1
2
3
4
5
6
7a
1
50
775
1
775
1
270
LS
LF
LF
LS
LF
LS
LF
8a
90
LF
9a
450
LF
10a
10
LF
7b
270
LF
8b
90
LF
9b
450
LF
10b
10
LF
11
12
13
14
15
16
17
18
19
20
21
265
575
250
0
30
1
16
32
1
1
1
Mobilization
18” Mild Steel Conductor
Pilot Bore Drilling
Geophysical Logging
Reaming Pilot Bore
Caliper Survey
8-inch. dia. SDR-17 PVC Blank Casing
Bell/Spigot
8-inch. dia. SDR-21 PVC Blank Casing
Bell/Spigot
8-inch. dia. SDR-21 PVC Slotted Casing
0.050 inch slots
Bell/Spigot
8-inch. dia. SDR-21 PVC Casing Cellar
Bell/Spigot
8-inch. dia. SDR-17 PVC Blank Casing
CertainTeed type
8-inch. dia. SDR-21 PVC Blank Casing
Certainteed type
8-inch. dia. SDR-21 PVC Slotted Casing
0.050 inch slots
CertainTeed type
8-inch. dia. SDR-21 PVC Casing Cellar
CertainTeed type
2” Mild Steel Gravel Pipe and Cap
Gravel Pack
Cement Grout
Standby Time
Well Development
Furnish/Install/Remove Test Pump
Pump Development
Production Testing
Acceptance Video
Disinfection
Site Clean-up
LF
LF
HR
HR
LS
HR
HR
LS
LS
LS
Unit Price
Alt A.
Unit Total
Alt B.
Unit Total
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
$
All changes in well design and methods will be paid at unit costs.
TOTAL BID AMOUNT
FIRM NAME:___________________________
REPRESENTATIVE: ______________________
TITLE:__________________________________