DRAFT
EXPANDED PHASE I REEVALUATION
FOR LBJ WEST CORRIDOR
CSJ: 2374-01-068
FROM LUNA ROAD TO US 75 ON IH-635
AND
FROM LOOP 12 TO VALWOOD PARKWAY ON IH-35E
DALLAS COUNTY
TEXAS DEPARTMENT OF TRANSPORTATION
MARCH 2007
TABLE OF CONTENTS
SECTION
PAGE
EXECUTIVE SUMMARY .................................................................................................................... 1
INTRODUCTION AND PURPOSE ...................................................................................................... 2
SECTION 1. REEVALUTION OF REGULATORY AGENCY DATABASE.................................. 4
SECTION 2. FINDINGS ............................................................................................................ 21
SECTION 3. CONDITIONS AND LIMITATIONS ..................................................................... 22
SIGNATURES OF QUALIFIED ENVIRONMENTAL PROFESSIONALS .................................. 24
LIST OF TABLES
TABLE 1. SUMMARY OF DATABASE FINDINGS .................................................................. 14
LIST OF FIGURES
FIGURE 1. SITES WITH POTENTIAL GROUNDWATER CONTAMINATION WITH
DIRECTION OF GROUNDWATER FLOW BASED ON DEM (DIGITAL
ELEVATION MODEL)
FIGURE 2. SITES WITH POTENTIAL GROUNDWATER CONTAMINATION WITH
DIRECTION OF SLOPE BASED ON DEM (DIGITAL ELEVATION MODEL)
Executive Summary
In December, 2006, a review of environmental regulatory databases was undertaken as
part of a Limited Phase I Environmental Site Assessment (ESA [ASTM 1527-00]) for the
proposed construction project on IH-635 from Luna Road to US 75 (9.25 miles) and on
IH-35E from Loop 12 to Valwood Parkway (4.75 miles) (Figure 1). In February 2007,
the Texas Department of Transportation (TxDOT) requested that a reevaluation be
performed on the limited Phase I ESA with particular emphasis on potential impacts of
contaminated groundwater on the project. The original database review determined all
listed sites to be of “low risk” to the subject corridor. For ground level construction, the
risk might be “low”; however, several segments of the proposed project could be
depressed, tunneled, and/or elevated and, as such, are likely to encounter groundwater
during construction. The purpose of this reevaluation is to provide TxDOT with further
clarification on potential groundwater impacts associated with the proposed methods of
construction. Upon review of the regulatory database and any additional groundwater
information (including depth, gradient, and contamination), the levels of risk will be
reevaluated according to this site specific information. Sites with potential or documented
groundwater contamination were mapped and color coded by potential to impact
groundwater in the project area (Figure 1). In addition, a map showing approximate
surface topography with color coded directions of slope is provided (Figure 2).
Summary of Findings
A reevaluation of the Limited Phase I Environmental Site Assessment (ASTM 1527-00)
for the proposed project on IH-635 from Luna Road to US 75 (9.25 miles) and on IH-35E
from Loop 12 to Valwood Parkway (4.75 miles) was performed. The results of the
reevaluation are presented in this report. Based on the tasks completed, the following
findings are reiterated:


Of the 310 sites listed in the regulatory agency database, 49 were determined to have
the potential to contaminate groundwater at the subject corridor. The 49 sites were
identified as sites with documented or probable contamination of groundwater.
After further review, the identified 49 sites were ranked according to the level of risk
posed to the subject corridor. Seven (7) sites were determined to be of moderate risk
and the remaining 42 sites were determined to be of low risk. The sites determined to
be of moderate risk all involved spills and are as follows:
- S IH-35E 500 feet past Valley View exit (Map ID 13), Dallas, TX due to potential
groundwater contamination as a result of a 30 gallon diesel spill in 1998.
- IH-635 and Coit Road (Map ID 11), Dallas, TX due to potential groundwater
contamination as a result of an 800 gallon gasoline spill in 1995.
- IH-35E and Valley View Lane (Map ID 9), Dallas, TX due to potential
groundwater contamination as a result of a 100 gallon diesel spill in 1998.
- Admiral Merchant Motor Freight (Map ID 1) IH-35E just south of IH635, Dallas,
TX due to potential groundwater contamination as a result of a 50 gallon diesel
spill in 1998.
1
-
McClendon Trucking Company (Map ID 6), E LBJ Freeway at Josey Lane Exit,
Dallas, TX due to potential groundwater contamination as a result of a 200 gallon
diesel oil spill in 1998.
- Flint, Inc (Map ID 6), E LBJ Freeway at Josey Lane Exit, Dallas, TX due to
potential groundwater contamination as a result of a 50 gallon solvent ink spill in
1998.
- US Fleet Services (Map ID 2), IH-35E and Valwood Pkwy, Farmers Branch, TX
due to potential groundwater contamination as a result of a 100 gallon diesel spill
in 1998, a 60 gallon diesel spill in 1990, a 46,000 lb calcium lignosulfate spill in
1992, a 100 gallon diesel spill in 1994, and a 200 gallon diesel spill in 1998.
 The seven moderate sites were plotted as red and the remaining 42 sites were plotted
as yellow in Figure 1. The groundwater flow direction/gradient for each site, if
available, was provided as well.
 Groundwater levels throughout the corridor are widely variable and frequently
fluctuate therefore, only groundwater depths at the time of construction are useful in
determining the potential risk of contaminated groundwater to activities at the subject
corridor.
Introduction and Purpose
On December 15, 2006, a review of regulatory databases was undertaken as part of a
Limited Phase I Environmental Site Assessment (ASTM 1527-00) for the proposed
construction project on IH-635 from Luna Road to US 75 (9.25 miles) and on IH-35E
from Loop 12 to Valwood Parkway (4.75 miles) (Figure 1). TxDOT requested that a
reevaluation be performed of the limited Phase I ESA with particular emphasis on
potential impacts of contaminated groundwater on the project. The original database
review determined all listed sites to be of “low risk” to the subject corridor. For ground
level construction, the risk might be “low”; however, several segments of the proposed
project could be depressed, tunneled, and/or elevated and, as such, are likely to encounter
groundwater during construction. These areas are indicated in Figure 1. The purpose of
this reevaluation is to provide TxDOT with further clarification on potential groundwater
impacts associated with the proposed methods of construction. Upon review of the
regulatory database and any additional groundwater information (including depth to
groundwater, groundwater gradient, and types and concentrations of contamination), the
levels of risk were reevaluated according to this site specific information.
Information concerning groundwater depth within the subject corridor was found in
geotechnical reports provided to TxDOT by Mas-Tek Engineering and Associates, Inc, in
March 2006 (western half of subject corridor [IH-35E]) and by Lachel and Felice
Associates, Inc in June 2006 (eastern half of subject corridor [IH-635]). According to the
data provided in these reports, the groundwater levels throughout the corridor are widely
variable and frequently fluctuate over time. In the segment of the subject corridor from
Northwest Highway to Valwood Parkway on IH-35E and from Luna Road to Webb
Chapel Road on IH-635, groundwater depths were found to vary from 3 to 28 feet. In the
segment of the subject corridor from Webb Chapel Road to Josey Lane on IH-635, the
groundwater depths vary from 15 to 20 feet. In the segment of the subject corridor from
2
Webb Chapel Road to Marsh Lane on IH-635, the groundwater depth varies from 2 to 8
feet. In the segment of the subject corridor from Marsh Lane to Hillcrest Road on IH-635,
the groundwater depth varies from 15 to 20 feet. Therefore, only groundwater depths at
the time of construction are useful in determination of potential risk of contaminated
groundwater to activities at the subject corridor.
The regulatory agency database listed 310 sites within their respective ASTM search
radii. Some sites were listed in multiple databases. The database was reviewed to
determine which of the sites were considered Recognized Environmental Concerns
(RECs). A REC is defined in ASTM practice E1527-00 as “the presence or likely
presence of any hazardous substances or petroleum products on a property under the
conditions that indicated an existing release, a past release, or a material threat of a
release of any hazardous substance or petroleum products into structures on the property
or in the ground, groundwater, or surface water of the property.” The term includes
hazardous substances or petroleum products even under conditions in compliance with
laws. The term is not intended to include de minimis conditions that generally do not
present a material risk of harm to public health or the environment and that generally
would not be the subject of an enforcement action if brought to the attention of
appropriate governmental agencies.
The 310 sites were reevaluated to determine whether they are “high risk”, “moderate
risk”, or “low risk” to the project areas that will require drilling or excavation and likely
encounter groundwater. “High risk” sites are those sites that are contaminated and located
within the proposed right-of-way (ROW). “Moderate risk” sites are those sites that are
adjacent to the ROW with a lower possibility to contaminate the ROW. “Low risk” sites
are those that may be contaminated, but do not appear to pose a contamination problem to
highway construction.
Upon reevaluation of the 310 sites, it was determined that 49 sites representing 123
database listings could pose a risk to groundwater at the proposed construction site. Sites
were eliminated based on their distance from the subject corridor, gradient from the
subject corridor, and nature of the database listing. It was assumed that contaminated
groundwater at an upgradient from the site was not likely to migrate greater than
approximately 1000 feet, moderately likely to migrate 500 feet and likely to migrate 250
feet in the event of deep subsurface drilling or excavation. The risk posed to the subject
corridor from groundwater contamination is also dependent upon the type of
contaminant, concentration of contaminant, and time since initial contamination. These
distances are based on average soil permeabilities listed in the Dallas County Soil Survey
(USDA, 1980) for the major soil types identified in the project area. It was assumed that
leaks of fuel or solvent would, in most cases, not migrate more than 1000 feet (without
substantial dilution and/or degradation) given the <0.06 in/sec average rate of soil
permeability identified for the soils associated with sites with potential groundwater
contamination. It was assumed that groundwater contamination within 100 feet of the
subject corridor is likely to seep into any large borehole or excavation that penetrates
beyond the water table. Based on these criteria, sites that revealed no evidence of existing
or likely groundwater contamination that could affect the subject corridor were
3
determined to be of no risk. Further research that included monitoring well data,
groundwater gradient information, and site specific records was performed by Geosearch
on the 49 sites that were determined to be a risk to groundwater at the proposed
construction site. This research consisted of accessing Texas Commission on
Environmental Quality (TCEQ) records located in Austin, Texas. This research was then
used to determine if the 49 sites were in fact a risk to groundwater at the subject corridor.
The sites were then plotted on the project map (Figures 1 & 2). Arrows indicate the
direction of groundwater flow with each site being color coded in respect to the level of
risk posed to the subject corridor. Groundwater flow information was taken from a
Digital Elevation Model (DEM) (Figure 2). It was assumed that the groundwater flow
typically follows the topography of the land. In addition, the cones of depression from
the dewatering activities will be dependent upon the surrounding soil permeability, local
topography and dewatering methodology.
A list of the 49 sites can be found in Table 1 following Section 1 of this document (only
areas of concern to groundwater contamination are mentioned in comments).
Section 1
Reevaluation of Regulatory Agency Database
The regulatory agency database report provided by Geosearch was reevaluated to
ascertain which of the original 310 sites pose a potential risk to groundwater at the
proposed construction sites. Based on the reevaluation, 49 sites were identified as
potential risks to groundwater in the project area. These 49 sites representing 123
database listings were then researched further (site specific records including monitoring
well data, and gradient information) in order to evaluate the degree of risk that they could
pose to the groundwater at the proposed construction sites. The site specific results of this
reevaluation are as follows:
Crews Plating, Inc (Map ID 226) is listed in the DOCKETS, VCP, and CERCLIS
databases. According to the CERCLIS database, illegal dumping of electroplating waste
into city sewers and ditches and a suspected 10,000 gallon tank of electroplating waste
and sludges were reported on- site. The facility applied for VCP in 1998 due to the
groundwater being contaminated with metals and VOCs, yet no record of completion has
been reported. The DOCKETS database listed the site as becoming a superfund site in
1999. The site is located at a distance of greater than 1500 feet and at a higher elevation
than the subject corridor, and the gradient direction is to the southwest. Due to the
distance from the subject corridor and the time since groundwater contamination, the site
poses a low risk to the subject corridor.
CXY Energy Offshore, Inc (Map ID 58) is listed in the DOCKETS database due to a
permit violation for effluent discharges of deck drainage, drill fluids, and produced water
oil in 1998. Due to the time since this incident occurred and no record of groundwater
contamination being found, the site poses a low risk to the subject corridor.
4
ORYX Energy Corporation (Map ID 143) is listed in the DOCKETS and IHW databases.
According to the DOCKETS listing, ORYX had a Clean Water Act Violation in 1997 for
an oil spill and an effluent permit violation 1998. The IHW database listed the site as an
inactive generator as of 2004. Due to the time since any spill or violation occurred and no
record of groundwater contamination being found, the site poses a low risk to the subject
corridor.
The New Datsun Corporation (Map ID 153) is listed under the DOCKETS, VCP, and
IHW databases. According to the DOCKETS database, a docket was filed for the site in
1978, yet it does not list the circumstances. The New Datsun Corporation enrolled into
the VCP program in 2004 due to the soil and groundwater being contaminated with
VOCs, SVOCs, and Metals. The VCP was completed in 2005. The IHW database lists
the site as an inactive generator as of 2004. The site poses a low environmental risk due
to its being at a distance of greater than 750 feet and at a lower elevation than the subject
corridor.
The Dallas City Landfill (Map ID 79) is listed under the MSWLF and NFRAP databases.
According to the MSWLF database, the sanitary landfill is closed and according to the
NFRAP database, the site was archived in 1993. According to an investigation report
provided by Geosearch, the site has been closed since at least 1980 and groundwater
contamination was found onsite in 1993. Due to the time since contamination was last
documented and its being at a lower elevation than the subject corridor, it poses a low
risk to the subject corridor.
BWay (Map ID 134) is listed under the VCP, TRI, IHW, and LPST databases. According
to the IHW database, the site is listed as an inactive generator as of 2003. The TRI
database lists no release of waste into the ground. VCP was applied for at the site in 2001
due to the soil and groundwater being contaminated with metals and chlorinated solvents.
No completion of this VCP has been reported. The LPST database reports groundwater
impact at the site in 2001, yet the site has been issued final concurrence and the case is
closed. Even though the site is at a higher elevation and sloping toward the subject
corridor, it is at a distance of greater than 750 feet from the subject corridor and is
underlain by low- permeability clay. Therefore, there is a low probability of contaminant
migration and the site poses a low risk to the subject corridor.
10620 Stemmons Freeway (Map ID 89) is listed under the PST and HMIRS databases.
This facility currently has two 600 gallon diesel tanks in use. According to the HMIRS
database, a 300 gallon gasoline spill occurred in 1996 that was reported to have been
cleaned up. Since there is no record of groundwater contamination and the site’s gradient
is away from the subject corridor, it poses a low risk to the subject corridor.
Exxon Mobil Corporation (Map ID 25) is listed under the IHW, LPST, and PST
databases. The IHW database lists the site as an inactive generator and the PST lists the
site as having three underground gasoline tanks currently in use. According to the LPST
database, a leak occurred in 1989 that impacted groundwater with no apparent threat to
receptors that has since been issued final concurrence. Due to the time since the leak
5
occurred and since the site is at a lower elevation than the subject corridor, it poses a low
risk to the subject property.
Omega Optical Company (Map ID 14) is listed as an active generator of numerous types
of hazardous waste under the IHW database. This site is also listed under the RCRAInfo
database as a small quantity generator. Since the site is located approximately 150 feet
from the subject corridor, the close proximity of hazardous waste generation at the site
poses a risk to the subject corridor. However, since no record of groundwater
contamination was found and the site is at a lower elevation that the subject corridor, the
risk is low.
Dallas Castle MPG, Inc (Map ID 17) is listed under the IHW, RCRAInfo, PST, and
LPST databases. The IHW database lists the site as inactive and the RCRAInfo database
lists the site as having no violations and generating no waste. According to the PST
database, a 10,000 gallon gasoline underground storage tank was removed from the site
in 1997 and there is currently a 3000 gallon above ground gasoline tank in use.
According to the LPST database, a leak was reported in 1996 that has since been issued
final concurrence with the case being closed. Groundwater was impacted with no
apparent threat to receptors. A risk assessment report provided by Geosearch stated that
three on site monitoring wells were sampled in 2002 and all concentrations were below
target cleanup levels. The report also illustrated the groundwater flowing toward the
northwest which is away from the subject corridor. Since contamination levels are below
cleanup levels, the groundwater flow is away from the subject corridor, and due to the
time since the leak and the last sampling, the site poses a low risk to the subject corridor.
Bankston Lincoln Mercury (MAP ID 20) is listed under the IHW, RCRAInfo, LPST, and
PST databases. According to the IHW database, the site is listed as an inactive small
quantity generator as of 2002. The RCRAInfo database noted one violation in 1991 that
dealt with non-financial record review, which would not pose any type of risk to the
subject corridor. The LPST database listed an occurrence in 1995 that had no
groundwater impact, and no apparent threats or impacts to receptors. The case was
issued final concurrence and the case has been closed. The PST database has one 4000
gallon PST in use on the subject property. The database also lists four 550 gallon PST
that are not in use, and were permanently filled in place in 1998. One other 2000 gallon
PST was removed from the site in 1992. With the groundwater gradient sloping to the
east, and with there not being any substantial ground water impacts to the subject site,
this site poses a low risk to the subject corridor.
Showcase Chevrolet (Map ID 21) is listed under the IHW, RCRA, LPST, and PST
databases. The IHW and RCRAInfo databases list the site as an active small quantity
generator of hazardous waste. The PST database states that an above ground gasoline and
an underground gasoline tank were removed in 1993. The LPST database reports that a
leak occurred which caused minor soil contamination and that has since been issued final
concurrence. Since no record of groundwater contamination has been documented, and
given the time since the leak occurred, the site poses a low risk to the subject corridor.
6
Collision Masters (Map ID 23) is listed under the IHW, RCRAInfo, and PST databases.
The IHW and RCRAInfo databases list the site as an active small quantity generator of
hazardous waste with no recorded violations. One 500 gallon underground used oil tank
was removed from the site in 1995. Since the site is located approximately 300 feet from
the subject corridor, the close proximity of hazardous waste generation at the site poses a
risk to the subject corridor. However, since no record of groundwater contamination was
found and the site is at a lower elevation that the subject corridor, the risk is low.
Mobil Oil Corporation (Map ID 26) is listed under the IHW, RCRAInfo, and PST
databases. The IHW database lists the site as an inactive generator and the RCRAInfo
database states that the site is not a generator and has no violations. According to the
LPST database, a leak was reported at the site in 1989 that impacted groundwater and has
since been issued final concurrence. The PST database lists three underground gasoline
tanks that are currently in use on site. Since the site is at a lower elevation than the
subject corridor and due to the time since the leak occurred, the site poses a low risk to
the subject corridor.
Midway Cleaners (Map ID 42) is listed under the IHW, RCRAInfo, LPST, and PST
databases. The IHW and RCRAInfo databases list the site as an inactive generator with
no violations. According to the LPST database, a leak occurred onsite in 1992 that did
not impact the groundwater and that has since been issued final concurrence. The PST
database lists four underground gasoline tanks that are currently in use at the site. Since
there is no documentation of groundwater contamination at the site, it poses a low risk to
the subject corridor.
Star Enterprises (MAP ID 47) is listed under the IHW, RCRAInfo, LPST and PST
databases. According to the IHW database, the site is listed as an inactive generator as of
2004. The RCRAInfo database shows no violations on the subject property. The LPST
database listed an occurrence in 1993 that impacted groundwater on the site. Monitoring
wells were installed in 1995, and the wells were sampled in 1995 and 1996. The final
sampling data indicates elevated amounts of benzene and MTBE in MW-4. Final
concurrence was given to the site in 1997, and the case was closed. The PST database
lists four 1000 gallon PST’s on site and in use. The PST database also lists one 1000
gallon PST was removed from the site in 1993. With the groundwater gradient sloping
away from the subject corridor, along with the site being at a lower elevation than the
subject corridor, and the extended period of time since of over 10 years since the elevated
levels of contaminates were documented, there is a low probability of contaminant
migration into the subject corridor and the site poses a low risk to the subject corridor.
Mobil Oil Corporation (Map ID 48) is listed under the IHW, RCRAInfo, LPST, and PST
databases. The IHW and RCRAInfo databases list the site as an inactive generator with
no violations. The LPST database lists a leak reported in 1998 that impacted groundwater
with no apparent threat to receptors. This case has since been issued final concurrence
and been closed. The PST database lists three underground gasoline tanks that are
currently in use at the site. Due to the time since the leak occurred and the gradient of the
7
site being parallel rather than towards the subject corridor, it poses a low risk to the
subject corridor.
Exxon Mobil Corporation (Map ID 49) is listed under the IHW, RCRAInfo, LPST, and
PST databases. The IHW and RCRAInfo databases list the site as an inactive generator
with no violations. According to the LPST database, a leak occurred onsite in 1996 that
had no impact on groundwater. The PST database lists the site as currently having three
gasoline and one diesel underground storage tanks in use. Due to no groundwater
contamination being reported at the site and the gradient of the site being away from the
subject corridor, it poses a low risk to the subject corridor.
Texaco Station (MAP ID 52) is listed under the RCRAInfo, LPST, and PST databases.
According to the RCRAInfo database, the site is listed as a conditionally exempt small
quantity generator with no violations. The LPST database listed two separate
occurrences in 1991 and in 1993. Neither of these occurrences had groundwater impacts
on the site. Both of these occurrences had soil contamination only. Remedial action was
taken in both instances with final concurrences being issued, and both cases were. The
PST database lists four 10,000 gallon PST’s, and one 550 gallon PST that were on the
site. All five PST’s were removed in 1993. With the groundwater gradient sloping away
from the subject corridor, and the subject corridor being at a higher elevation, the site
poses a low risk to the subject corridor.
Exxon Mobil Corporation (Map ID 53) is listed under the RCRAInfo, LPST, IHW, and
PST databases. The IHW and RCRAInfo databases list the site as an inactive generator
with no violations as of 2003. According to the LPST database, a leak was reported in
1993 that impacted the groundwater and has since been issued final concurrence. The
PST database lists eight tanks which have all been removed. Since the site is at a lower
elevation with a gradient away from the subject corridor, the site poses a low risk to the
subject corridor.
Exxon RAS 6 3700 (Map ID 67) is listed under the RCRAInfo, LPST, IHW, and PST
databases. The IHW and RCRAInfo databases list the site as an inactive generator with
no violations. The LPST database lists a leak reported in 1992 that impacted the
groundwater and has since been issued final concurrence. The PST database lists four
tanks which have all been removed. Since the site is at a lower elevation with a gradient
away from the subject corridor, it poses a low risk to the subject property.
Forest Lane Porsche (MAP ID 62) is listed under the IHW, RCRAInfo, LPST, and PST
databases. The IHW database listed the site as an inactive generator as of 2004.
According to the RCRAInfo database there have been not violations on the site. The
LPST database reports groundwater impact at the site in 1989, yet the site has been issued
final concurrence and the case is closed. The PST database listed twenty-two 99 gallon
tanks in use on the site. Also listed on the PST database were three 2000 gallon tanks
that were removed from the site between 1988 and 1989. With the groundwater gradient
sloping away from the subject corridor, and the subject corridor being at a higher
elevation, the site poses a low risk to the subject corridor.
8
Exxon Mobil Corporation (MAP ID 65) is listed under the IHW, RCRAInfo, LPST, and
PST databases. According to the IHW database, the site is listed as an inactive generator
as of 2002. The RCRAInfo database shows no violations on the subject property. The
LPST listed an occurrence in 1996 that impacted groundwater on the site, yet the site has
been issued final concurrence and the case is closed. The PST database listed four large
volume tanks on site that contain oil, gasoline, or diesel. The PST database also lists four
tanks that were removed from the site in 1986. With the groundwater gradient sloping
away from the subject corridor, and the subject corridor being at a higher elevation, the
site poses a low risk to the subject corridor.
Shell SVC Station (MAP ID 68) is listed under the RCRAInfo, LPST, and PST
databases. The RCRAInfo database shows the site to be generator with no violations on
the subject property. The LPST listed an occurrence in 1995 that impacted groundwater
on the site. The case was issued final concurrence and the case has been closed. It was
documented in a report provided by GeoSearch that no groundwater impacts were
documented at the site from the 1998 occurrence. The PST database listed four storage
tanks on the site that are in use at this time. Two of the tanks are 44 gallons in capacity
and have unknown contents. The remaining tanks are 15,000 gallon capacity tanks with
contents being gasoline. The PST database also listed five tanks that were removed in
1994. With the groundwater gradient sloping away from the subject corridor, and the
subject corridor being at a higher elevation, the site poses a low risk to the subject
corridor.
Days Inn Hotel (MAP ID 109) is listed under the IOP and the VCP databases. According
to the IOP database, the site received a certificate for completing IOP requirements in
2000. The IOP was received due to possible contaminates from an adjacent property
polluting groundwater on site. Elevated levels of solvents related to dry cleaning
operations were found in the groundwater on site. The VCP database lists the site as
entering the VCP program in 1997, but the database does not list a completion date. The
site is at a higher elevation than the subject corridor. However the gradient is not directly
towards the subject corridor and the site is at a distance of greater than 500 feet.
Therefore, the site poses a low risk to the subject corridor.
Buddy’s Texaco (MAP ID 18) is listed under the LPST and PST databases. The LPST
database listed an occurrence in 1987 where groundwater was impacted on the site. Final
concurrence was issued for the site, and the case was closed. It should be noted that in a
report provided by GeoSearch, that monitoring well data was still being collected in
2004, with the results of that data showing elevated levels of contaminates still present.
According to the PST database, the site has two storage tanks on site. One tank contains
gasoline, and the other has unknown contents stored. Between 1995 and 1999 there were
storage tanks removed that were used to store petroleum products. The groundwater
water gradient is toward the subject corridor, and the site is approximately 200 feet from
the subject corridor. The subject corridor is at a high elevation, therefore there is a low
probability of contaminant migration and the site poses a low risk to the subject corridor.
9
Chevron 105954 (MAP ID 19) is listed under the LPST and the PST databases. The
LPST database listed one occurrence in which groundwater was impacted in 1992. The
site received final concurrence in 1999, and the case was closed. It is noted in the final
concurrence that although maximum groundwater concentrations exceed Category III
levels, the plume appears to be stable and/or declining. The PST database listed four
storage tanks that are currently in use, and are used to store gasoline or diesel. There is a
fifth tank on site that is temporarily out of use, and is used to store used oil. With the
groundwater gradient sloping way from the subject corridor, and the subject corridor
being at a higher elevation, the site poses a low risk to the subject corridor.
US Fleet Services (Map ID 2) is listed under the SPILLS and ERNS databases. The
ERNS database lists a 100 gallon diesel spill on pavement that occurred in 1998. The
SPILLS database lists a 60 gallon diesel spill that affected Cook’s Creek in 1990. It also
lists a 46000 lb calcium lignosulfate spill that affected an unnamed tributary to Hutton
Creek in 1992. There was also a 200 gallon diesel spill in 1994 that affected the Trinity
basin and a 200 gallon concrete additive spill in 1998 that affected the drainage ditch.
Given the clearly large amount of spillage at this site, its very close proximity to the
subject corridor and its gradient towards the subject corridor, there is a potential for
groundwater contamination at this site. Therefore, this site poses a moderate risk to
construction activity at the subject corridor.
Mission Transport Company (Map ID 5) is listed under the SPILLS and ERNS databases.
Both databases list a 65 gallon gasoline spill which occurred in 1989. Regardless of the
sites close proximity to the subject corridor, the gradient of the site is away from the
subject corridor, the incident occurred more than fifteen years ago, and the site therefore
poses a low risk to the subject corridor.
Flint, Inc (Map ID 6) is listed under the ERNS database due to a 50 gallon solvent ink
spill which occurred onsite in 1998 and which was stated to affect the pavement along the
highway. Given the chances for spillage to runoff into the nearby soil and seep into the
groundwater, there is a potential for groundwater contamination at this site. In addition,
the site is at a higher elevation than the subject property and within fifty feet of the
subject corridor, therefore it poses a moderate risk to groundwater at the subject property.
McClendon Trucking Company (Map ID 6) is listed under the ERNS database due to a
200 gallon diesel onsite in 1998 which was stated to affect asphalt and soil. Given the
chances for spillage to seep from the soil into the groundwater, there is a potential for
groundwater contamination at this site. In addition, the site is at a higher elevation than
the subject corridor and within fifty feet of the subject corridor, therefore it poses a
moderate risk to groundwater at the subject property.
Tempo Mechanical (Map ID 24) is listed under the IHW, LPST, and PST databases. The
IHW database lists the site as an inactive generator. According to the LPST database, a
leak was reported in 1990 that was classified as group one contaminated groundwater that
has or is likely to migrate offsite. Final concurrence has since been issued and the case is
closed. The PST database lists three tanks, all of which have been removed. Since the site
10
is at a lower elevation with a gradient away from the subject property, the contaminated
groundwater most likely migrated away from the subject corridor. Therefore, the site
poses a low risk to the subject corridor.
Texaco (Map ID 28) is listed under the LPST and PST databases. The LPST database
lists a reported leak in 1988 that impacted groundwater and has since been issued final
concurrence. The PST database lists 3 gasoline underground storage tanks that are
currently in use on site. The time since the leak occurred and the lack of current
documentation of groundwater contamination make this site a low risk to the subject
corridor.
Exxon (Map ID 28) is listed under the LPST database due to a leak reported in 1992 that
impacted groundwater and has since been issued final concurrence. The time since the
leak occurred and the lack of current documentation of groundwater contamination make
this site a low risk to the subject corridor.
Midway Texaco (Map ID 43) is listed under the PST and LPST databases. According to
the LPST database, a leak was reported in 1989 that impacted a domestic water supply
well and has since been issued final concurrence. The PST database lists one
underground storage tank of unknown content (probably gasoline or diesel) currently in
use. Given the time since the leak occurred and the lack of current documentation of
groundwater contamination, the site poses a low risk to the subject corridor.
635 Diamond Shamrock (Map ID 51) is listed under the LPST and PST databases.
According to the LPST database, a leak was reported in 1987 that impacted the
groundwater and has since been issued final concurrence. The PST database lists 2
underground gasoline tanks that are currently in use. Due to the time since the leak
occurred and the gradient being away from the subject corridor, the site poses a low risk
to the subject corridor.
Rodger Meier Cadillac (Map ID 60) is listed under the VCP, LPST, and PST databases.
The site was enrolled in the VCP program in 1990 due to groundwater contamination,
remedied by excavation, and completed in 2003. The LPST database lists a leak in 1990
that impacted groundwater and that is pending concurrence upon documentation of well
plugging. The PST database lists all tanks as being permanently filled in place. Since the
gradient is away from the subject corridor, the site poses a low risk.
Graystone Place (Map ID 66) is listed under the LPST and PST databases. According to
the LPST database, a leak was reported in 1990 that affected the groundwater and has
since been issued final concurrence. The PST database lists one diesel underground
storage tank in use at the site. Due to the time since the leak occurred and the lack of
current documentation of groundwater contamination, the site poses a low risk to the
subject corridor.
The NW corner of IH35E and Manana Drive (Map ID 8) is listed under the MSWLF
databases. According to the MSWLF database, the landfill was proposed in 1996, but no
11
permits have been issued to date. Since there is no evidence that this site was ever an
active landfill, or that there is any groundwater contamination on site, and due to the
gradient being generally away from the subject corridor, the site poses a low risk.
The City of Dallas Property (Map ID 15) is listed under the IHW and MSWLF databases.
The IHW database lists the site as an inactive generator. The MSWLF database lists the
site as being closed and in use prior to 1974. Due to the time since the landfill was in
operation, the general gradient being away from the subject corridor and the lack of
evidence of groundwater contamination, the site poses a low risk.
Concourse Office Park (Map ID 93) is listed under the VCP database. This site enrolled
in the VCP program in 1998 due to the soil being contaminated with TPH and was
completed in 2000. Due to there being no record of groundwater contamination, and the
gradient being away from the subject corridor, the site poses a low risk.
John Roberts BMW (Map ID 98) is listed under the VCP database. The site enrolled in
the VCP program in 2005 due to the soil and groundwater being contaminated with
metals and chlorinated solvents. No completion has been reported to date. Due to the
gradient of the site being away from the subject corridor and the distance being more than
500 feet, the site poses a low risk.
Midway Plaza (Map ID 102) is listed under the VCP, IHW, RCRAInfo, and DCR
databases. The IHW and RCRA databases list the site as being an inactive generator with
no violations as of 2004. The DCR database lists the site as being a drycleaner drop
station. The site enrolled in the VCP program in 1998 due to the soil and groundwater
being contaminated with solvents. The gradient of the site is toward the subject corridor,
however, the VCP was completed in 2000 and the site is at a distance of greater than 500
feet, therefore the site poses a low risk to the subject corridor.
Sam’s Cleaners (Map ID 110) is listed under the VCP database. The site enrolled in the
VCP program in 2002 due to the groundwater being contaminated with VOCs and
chlorinated solvents. No completion has been reported to date. Since the site is at a lower
elevation with a gradient away from the subject corridor, it poses a low risk.
Comet Drycleaners (Map ID 152) is listed under the VCP, IHW, and DCR databases. The
site enrolled in the VCP program in 1996 and 2002 due to the groundwater being
contaminated with chlorinated solvents. No completion of either VCP has been reported
to date. The IHW database lists the site as an inactive generator. The DCR database lists
the site as being a drycleaner facility. Due to the site being at a lower elevation, with a
gradient away from the subject corridor, and a distance of greater than 750 feet, it poses a
low risk to the subject corridor.
Admiral Merchant Motor Freight (Map ID 1) is listed under the SPILLS database due to
two diesel spills of approximately fifty gallons which occurred in 1998. This incident
occurred along northbound IH-35E which lies within the subject corridor. No record of
cleanup was located, and spillage from this incident is very likely to have reached the soil
12
and seeped into the groundwater. Therefore, this site poses a moderate risk to activities at
the subject corridor.
IH-35E and Valley View Lane (Map ID 9) is listed under the SPILLS database due to a
100 gallon diesel spill which occurred in 1998. This incident occurred at the intersection
of IH-35E and Valley View Lane which lies within the subject corridor. According to the
SPILLS database, Farmers Branch Creek was affected by this incident. No record of
cleanup was located and spillage from this incident is very likely to have also reached the
soil and seeped into the groundwater. Therefore, this site poses a moderate risk to
activities at the subject corridor.
IH-635 and Coit Road (Map ID 11) is listed under the SPILLS database due to an 800
gallon unleaded gasoline spill which occurred on top of the overpass in 1995. No record
of cleanup was found, and due to the large volume of this spill, it is likely that a
substantial amount of spillage could have runoff into the soil and seeped into the
groundwater. This site is located within the subject corridor; therefore this site poses a
moderate risk to activities at the subject corridor.
S IH-35E 500 feet past Valley View Exit (Map ID 13) is listed under the SPILLS
database due to a 30 gallon diesel spill that occurred onsite in 1997. The incident
occurred within the subject corridor and no cleanup was reported. It is likely that spillage
could have runoff into the soil and seeped into the groundwater, therefore the site poses a
moderate risk to activities at the subject corridor.
13
226
.31
mi.
H
58
.06
mi
L
143
.16
mi
H
153
.17
mi
L
79
.08
mi.
134
.15
mi.
Crews Plating, Inc
2530 Merrell Drive
Dallas, TX
IOP
NFRAP
CERCLIS
MSWLF
DCR
ERNS
HMIRS
PST
LPST
TRI
RCRAInfo
IHW
VCP
DOCKETS
Location
Potential
Envir. Risk
(L,M ,H)
SPILLS
Elevation
Distance
Map ID
Table 1: Summary of Database Findings
Comments
CERCLIS- illegal dumping of
electroplating waste into city sewer
and ditches, suspected 10,000
gallon tank of electroplating waste
and sledges on site.
VCP- enrolled 1998, no record of
completion
L
X X
L
X
L
X
X
DOCKETS- CWA violation (oil
spill) 1997
The New Datsun Corporation
13130 Preston Road
Dallas, TX
L
X X X
VCP- groundwater contaminated
. enrolled 2004, completed 2005
L
The Dallas City Landfill
11535 Newberry
Dallas, TX
L
H
BWay
13401 Denton Drive
Farmers Branch, TX
CXY Energy Offshore, Inc
12790 Merit Drive
Dallas, TX
ORYX Energy Corporation
13155 Noel Road
Dallas, TX
L
X
DOCKETS- CWA permit violation
(effluent) 1998
X
X X
14
X X
X
MSWLF- closed landfill
NFRAP- site archived 1993
VCP- enrolled 2001, groundwater
contaminated, no remediation
reported to date.
LPST- groundwater impact 2001.
final concurrence issued
CERCLIS
RCRAInfo
DOCKETS
.03
mi.
L
Omega Optical Company
13515 North Stemmons Freeway
Farmers Branch, TX
L
X X
17
.04
mi.
H
Dallas Castle MPG, Inc
11130 Malibu Drive
Dallas, TX
L
X X
X X
20
.04
mi.
L
Bankston Lincoln Mercury
4747 LBJ Freeway
Dallas, TX
L
X X
X X
PST- one gasoline tank in use
21
.04
mi.
H
Showcase Chevrolet
5327 LBJ Freeway
Dallas, TX
L
X X
X X
IHW- active generator of
hazardous waste
LPST- 1992, minor soil
contamination
23
.06
mi.
L
Collision Masters
14011 N. Stemmons Freeway
Dallas, TX
L
X X
X
IHW- active generator of
hazardous waste
26
.05
mi
L
Mobil Oil Corporation
13211 Stemmons Freeway
Dallas, TX
L
X X
15
X X
IOP
14
X X
NFRAP
X
MSWLF
L
DCR
Exxon Mobil Corporation
13115 Harry Hines Boulevard
Farmers Branch, TX
X X
ERNS
L
HMIRS
.05
mi.
PST
25
LPST
L
TRI
10620 Stemmons Freeway
Dallas, TX
IHW
=
VCP
Elevation
Potential
Envir. Risk
(L,M ,H)
SPILLS
Distance
.09
mi.
Map ID
89
Location
Comments
HMIRS- 300 gal gasoline spill
1996
PST- 2 6000 gal diesel tanks in use
PST- 3 underground gasoline tanks
in use
LPST- Leak reported 1989, final
concurrence issued, case closed.
IHW- active generator of
numerous types of hazardous
waste
IHW- inactive as of 2004
(see map ID 17 below)
PST- 3000 gallon gasoline AST in
use
LPST- Leak reported 1996, Final
concurrence issued, case closed
PST- 3 underground gasoline tanks
in use
LPST- 1989, groundwater
impacted, final concurrence issued
IOP
NFRAP
CERCLIS
MSWLF
DCR
ERNS
HMIRS
PST
LPST
TRI
RCRAInfo
IHW
VCP
DOCKETS
Potential
Envir. Risk
(L,M ,H)
SPILLS
Elevation
Distance
Map ID
Location
Comments
PST- 4 underground gasoline tanks
in use
LPST- 1992, no groundwater
impact, final concurrence issued
PST- 3 gasoline, 1 diesel
underground storage tanks in use
LPST- 1993, groundwater
impacted, final concurrence issued,
case closed
PST- 3 underground gasoline tanks
in use
LPST- 1998, groundwater
impacted, final concurrence issued
H
Midway Cleaners
12924 Midway Road
Dallas, TX
L
X X
X X
.06
mi.
L
Star Enterprises
13010 Preston Road
Dallas, TX
L
X X
X X
48
.06
mi.
H
Mobil Oil Corporation
12920 Preston Road
Dallas, TX
L
X X
X X
49
.06
mi.
=
L
X X
X X
PST- 3 gasoline, 1 diesel tanks in
use
52
.06
mi.
L
L
X
X X
LPST- 1993, soil contamination
only, final concurrence issued, case
closed.
53
.06
mi.
L
L
X X
X X
LPST: 1993, groundwater
impacted, final concurrence issued
67
.07
mi
L
L
X X
X X
LPST: 1992, groundwater
impacted, final concurrence issued
42
.09
mi.
47
62
.07
mi.
L
Exxon Mobil Corporation
12969 Preston Road
Dallas, TX
Texaco Station
7940 LBJ Freeway
Dallas, TX
Exxon Mobil Corporation
11925 Josey Lane
Dallas, TX
Exxon RAS 6 3700
12004 Webb Chapel Road
Farmers Branch, TX
Forest Lane Porsche
2640 Forest Lane
Dallas, TX
LPST- 1989, groundwater
impacted, final concurrence issued
L
X X
X X
PST- 22 underground 99- gallon
tanks of unknown contents in use.
16
65
.07
mi.
L
Exxon Mobil Corporation
4205 LBJ Freeway
Farmers Branch, TX
68
.07
mi.
L
Shell SVC Station
12103 Webb Chapel Road
Farmers Branch, TX
L
2
.01
mi.
H
US Fleet Services
IH 35E and Valwood Pkwy
Farmers Branch. TX
M
X
X
5
.01
mi.
=
L
X
X
6
.01
mi.
H
6
.01
mi.
H
Mission Transport Company
IH635 at Coit Road
Dallas, TX
Flint, Inc
E LBJ Freeway at Josey Lane Exit
Dallas, TX
McClendon Trucking Company
E LBJ Freeway at Josey Lane Exit
Dallas, TX
L
X X
X X
X
X X
IOP
NFRAP
CERCLIS
MSWLF
DCR
ERNS
HMIRS
PST
LPST
TRI
RCRAInfo
IHW
VCP
DOCKETS
Potential
Envir. Risk
(L,M ,H)
SPILLS
Elevation
Distance
Map ID
Location
Comments
LPST- 1996, groundwater
impacted, final concurrence issued
PST- 3 gasoline, 1 used oil, 1
diesel underground storage tanks in
use
LPST: 1995, designated major or
minor aquifer impacted, final
concurrence issued
PST: 2 of unknown content and 2
gasoline underground storage tanks
in use
ERNS: 100 gallon diesel spill
1998,
SPILLS: 60 gallon diesel spill
1990, 46000 lb calcium
lignosulfate spill 1992, 100 gallon
diesel spill 1994, 200 gallon diesel
spill 1998
ERNS: 65 gallon gasoline spill
1989
SPILLS: “ “
M
X
ERNS: 50 gallon solvent ink spill,
1998
M
X
ERNS: 1998. 200 gallon oil: diesel
17
IOP
NFRAP
CERCLIS
MSWLF
DCR
ERNS
HMIRS
PST
LPST
TRI
RCRAInfo
IHW
VCP
DOCKETS
Potential
Envir. Risk
(L,M ,H)
SPILLS
Distance
18
Elevation
Map ID
109
.11
mi.
Location
Comments
IOP: applied 1998 due to
groundwater contamination
VCP: enrolled 1997, completion
not reported
PST: 1 gasoline, 1 unknown
underground storage tank
LPST: 1987, groundwater
impacted, final concurrence issued
PST: 3 gasoline, 1 diesel tanks in
use
LPST: 1992, groundwater
impacted, final concurrence issued
LPST- 1990, groundwater
impacted, likely to migrate offsite,
final concurrence issued
PST: 3 gasoline underground
storage tanks in use
LPST: 1988, groundwater
impacted, final concurrence issued
H
Days Inn Hotel
8051 LBJ Freeway
Dallas, TX
L
.04
mi.
L
Buddy’s Texaco
2360 Valwood Parkway
Dallas, TX
L
X X
19
.04
mi.
L
Chevron 105954
14051 Harry Hines Boulevard
Dallas, TX
L
X X
24
.05
mi.
L
Tempo Mechanical
13737 Stemmons Freeway
Dallas, TX
L
28
.05
mi.
H
Texaco
11404 IH35E
Dallas, TX
L
X X
28
.05
mi.
H
Exxon
2405 Royal Lane
Dallas, TX
L
X
LPST: 1992, groundwater
impacted, final concurrence issued
X X
PST: 1 UST of unknown content in
use
LPST: 1989, domestic water
supply well intake impacted, final
concurrence issued
43
.06
mi.
Midway Texaco
4316 IH 635
Dallas, TX
X
X
X
L
18
X X
L
635 Diamond Shamrock
12950 Coit Rd
Dallas, TX
L
.07
mi.
H
Rodger Meier Cadillac
4707 IH635
Dallas, TX
L
66
.07
mi.
H
Graystone Place
2727 IH635
Dallas, TX
L
8
.01
mi.
L
15
.01
mi.
L
93
.09
mi.
L
98
.10
mi.
102
.10
mi.
51
.07
mi.
60
NW Corner IH35E and Manana
Drive
Dallas, TX
City of Dallas property
2300 West Walnut Hill
Dallas, TX
Concourse Office Park
6310-6390 LBJ Freeway
Dallas, TX
X X
X
X X
X X
L
IOP
NFRAP
CERCLIS
Comments
PST: 2 gasoline underground
storage tanks in use
LPST: 1987, groundwater
impacted, final concurrence issued
VCP: enrolled 1990, groundwater
contaminated, remedy: excavation
completed 2003
LPST: 1990, groundwater
impacted, concurrence pending
documentation of well plugging
PST- 1 diesel underground storage
tank in use
LPST- 1990, groundwater
impacted, final concurrence issued
L
L
MSWLF
DCR
ERNS
HMIRS
PST
LPST
TRI
RCRAInfo
IHW
VCP
DOCKETS
Potential
Envir. Risk
(L,M ,H)
SPILLS
Elevation
Distance
Map ID
Location
X
X
Landfill site proposed 1996, no
permits issued to date
X
Landfill in operation prior to 1974
(grandfather site)
VCP- enrolled 1998, completed
2000, soil contaminated
X
H
John Roberts BMW
2536 Forest Lane
Dallas, TX
L
X
H
Midway Plaza
12801 Midway Road
Dallas, TX
L
X X X
19
X
VCP- enrolled 2005, no
completion reported, soil and
groundwater contaminated with
metals and chlorinated solvents
VCP- enrolled 1998, completed
2000, soils and groundwater
contaminated with solvents
L
Sam’s Cleaners
2903 Forest Lane
Dallas, TX
L
X
.17
mi
L
Comet Drycleaners
12817 Preston Road
Dallas, TX
L
X X
1
.01
=
9
.01
mi
=
11
.02
mi.
H
13
.02
mi.
=
Admiral Merchant Motor Freight
IH35E just south of IH635
Dallas, TX
IH35 and Valley View Lane
Dallas, TX
IH635 and Coit Road
Dallas, TX
S IH35 500 feet past Valley View
Exit
Dallas, TX
X
IOP
NFRAP
CERCLIS
MSWLF
DCR
ERNS
HMIRS
PST
LPST
TRI
RCRAInfo
IHW
VCP
DOCKETS
Potential
Envir. Risk
(L,M ,H)
SPILLS
Distance
152
Elevation
Map ID
110
.11
mi.
Location
Comments
VCP- enrolled 2002, no
completion reported, groundwater
contaminated with VOCs and
chlorinated solvents
VCP- enrolled 1996, no
completion reported, groundwater
contaminated with chlorinated
solvents.
VCP- enrolled 2002, groundwater
contaminated with chlorinated
solvents, no completion reported
M
X
50-75 gallon diesel spill 1998
50 gallon diesel spill 1998
M
X
100 gallon diesel spill 1998
M
X
800 gallon gasoline spill 1995
M
X
30 gallon diesel spill 1997
Potential Environmental Risk – L - low, M - moderate, H – high
X - Database entries identified within the relevant ASTM search radius
Elevation- H-Higher than corridor, L-Lower than corridor
20
Section 2
Findings
In December, 2006, a review of environmental regulatory databases was undertaken as
part of a Limited Phase I Environmental Site Assessment (ASTM 1527-00) for the
proposed construction project on IH-635 from Luna Road to US 75 (9.25 miles) and on
IH-35E from Loop 12 to Valwood Parkway (4.75 miles) (Figure 1). TxDOT requested
that a reevaluation be performed on the limited Phase I ESA with particular emphasis on
potential impacts of contaminated groundwater on the project. The original database
review determined all listed sites to be of “low risk” to the subject corridor. For ground
level construction, the risk might be “low”; however, several segments of the proposed
project could be depressed, tunneled, and/or elevated and, as such, are likely to encounter
groundwater during construction. The purpose of this reevaluation is to provide TxDOT
with further clarification on potential groundwater impacts associated with the proposed
methods of construction. Upon review of the regulatory database and any additional
groundwater information (including depth, gradient, and contamination), the levels of
risk will be reevaluated according to this site specific information. Sites with potential or
documented groundwater contamination were mapped and color coded by potential to
impact groundwater in the project area (Figure 1). In addition, a map showing
approximate surface topography with color coded directions of slope is provided (Figure
2).
Summary of Findings
A reevaluation of a Limited Phase I Environmental Site Assessment (ASTM 1527-00) for
the proposed project on IH-635 from Luna Road to US 75 (9.25 miles) and on IH-35E
from Loop 12 to Valwood Parkway (4.75 miles) was performed. The results of the
reevaluation are presented in this report. Based on the tasks completed, the following
findings are reiterated:


Of the 310 sites listed in the regulatory agency database, 49 were determined upon
reevaluation to have the potential to contaminate groundwater at the subject corridor.
The 49 sites were identified as sites with documented or probable contamination of
groundwater.
After further review, the identified 49 sites were ranked according to the level of risk
posed to the subject corridor. Seven (7) sites were determined to be of moderate risk
and the remaining 42 sites were determined to be of low risk. The sites determined to
be of moderate risk all involved spills and are as follows:
- S IH-35E 500 feet past Valley View exit (Map ID 13), Dallas, TX due to potential
groundwater contamination as a result of a 30 gallon diesel spill in 1998.
- IH-635 and Coit Road (Map ID 11), Dallas, TX due to potential groundwater
contamination as a result of an 800 gallon gasoline spill in 1995.
- IH-35E and Valley View Lane (Map ID 9), Dallas, TX due to potential
groundwater contamination as a result of a 100 gallon diesel spill in 1998.
- Admiral Merchant Motor Freight (Map ID 1) IH-35E just south of IH-635, Dallas,
TX due to potential groundwater contamination as a result of a 50 gallon diesel
spill in 1998.
21
-
McClendon Trucking Company (Map ID 6), E LBJ Freeway at Josey Lane Exit,
Dallas, TX due to potential groundwater contamination as a result of a 200 gallon
diesel oil spill in 1998.
- Flint, Inc (Map ID 6), E LBJ Freeway at Josey Lane Exit, Dallas, TX due to
potential groundwater contamination as a result of a 50 gallon solvent ink spill in
1998.
- US Fleet Services (Map ID 2), IH-35E and Valwood Pkwy, Farmers Branch, TX
due to potential groundwater contamination as a result of a 100 gallon diesel spill
in 1998, a 60 gallon diesel spill in 1990, a 46,000 lb calcium lignosulfate spill in
1992, a 100 gallon diesel spill in 1994, and a 200 gallon diesel spill in 1998.
 The seven moderate sites were plotted as red and the remaining 42 sites were
plotted as yellow in Figure 1. The groundwater flow direction/gradient for each
site, if available, was provided as well.
 Groundwater levels throughout the corridor are widely variable and frequently
fluctuate therefore, only groundwater depths at the time of construction are useful
in determining the potential risk of contaminated groundwater to activities at the
subject corridor.
Section 3
Conditions and Limitations
A. Special Terms and Conditions
This expanded Phase I reevaluation documents the locations of potential groundwater
contamination that could impact proposed construction activities along IH-635 from Luna
Road to US 75 (9.25 miles) and on IH-35E from Loop 12 to Valwood Parkway (4.75
miles). This expanded Phase I reevaluation is intended to be a document in which
available environmental information is compiled to assist TxDOT in making decisions
concerning construction activities along the subject corridor.
The expanded Phase I reevaluation was completed in general compliance with the scope
and limitations of the consensus document known as ASTM E 1527-00. This report is
intended as a limited assessment of groundwater contamination that could affect the
subject corridor and has been prepared in accordance with generally accepted local
assessment practices. No warranties, express or implied, are intended or made. The
limitations of this reevaluation should be recognized as TxDOT formulates conclusions
on the environmental risks associated with the subject corridor.
This screening primarily relied upon a regulatory agency database report and site specific
research provided by Geosearch as well as a previous Limited Phase I ESA conducted in
December 2006. It was designed to summarize groundwater conditions within the area of
study (including gradient and presence of contamination). LGGROUP does not warrant
the work of regulatory agencies or other third parties supplying information which may
have been used during the preparation of this report.
22
B. Limitations and Exceptions of Assessment
To achieve the study objectives stated in this report, LGGROUP personnel were required
to base their conclusions on the best information available during the period of the
investigation and within the limits prescribed by TxDOT in the contract.
No investigative method can completely eliminate the possibility of obtaining partially
imprecise or incomplete information. Thus, LGGROUP cannot guarantee that the
investigations completely define the degree or extent of any groundwater contamination
by hazardous or otherwise harmful substances described in this report or, if no such
contamination was found, its absolute absence. Professional judgment was exercised in
gathering and analyzing the information obtained, and LGGROUP commits to the usual
care, thoroughness, and competence of the environmental profession.
This report is not a legal opinion. It does not necessarily comply with requirements
defined in any environmental law such as the “innocent landowner defense” or “due
diligence inquiry.” Only legal counsel retained by TxDOT is competent to determine the
legal implications of any information or conclusions in this report. Except as expressly
provided for in our agreement with TxDOT, LGGROUP is not responsible for any effect
upon the legal rights, obligations, or liabilities of any party, or for any effect on the
financeability, marketability, or value of the property investigated in the study, or for the
occurrence or nonoccurrence of any transaction involving the property.
C. Methodology Used
Preparation of the expanded Phase I reevaluation followed a methodical process in which
available information was analyzed and conclusions were drawn regarding the condition
of the property in general accordance with ASTM Phase I ESA guidelines. A
reevaluation of a previous limited Phase I ESA as well as the regulatory agency used to
prepare it was conducted. The purpose of this reevaluation is to provide TxDOT with
further clarification on potential groundwater impacts associated with the proposed
methods of construction.
23
Signatures of Qualified Environmental Professionals
Lyle Winnette, PG (Report review)
__________________________
Tom Karan, PE (Report review)
__________________________
Jason Sellers (Records review and report preparation)
__________________________
Robert Hines (Records review and report preparation)
__________________________
Rod Sandoval (Figure preparation)
__________________________
24