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ARCHIVED REPORTS XR0011743
EnvironmentalHealth
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PR0544801
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ARCHIVED REPORTS XR0011743
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Last modified
11/19/2024 10:19:08 AM
Creation date
9/4/2019 10:58:29 AM
Metadata
Fields
Template:
EHD - Public
ProgramCode
3500 - Local Oversight Program
File Section
ARCHIVED REPORTS
FileName_PostFix
XR0011743
RECORD_ID
PR0544801
PE
3528
FACILITY_ID
FA0003210
FACILITY_NAME
TEXACO TRUCK STOP
STREET_NUMBER
7500
Direction
W
STREET_NAME
ELEVENTH
STREET_TYPE
ST
City
TRACY
Zip
95378
APN
25015018
CURRENT_STATUS
02
SITE_LOCATION
7500 W ELEVENTH ST
P_LOCATION
03
P_DISTRICT
005
QC Status
Approved
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EHD - Public
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f Extended Site Characterization Report: 7500 West Eleventh Street, Tracy, CA. Page 29 <br /> 7.2.2 7777 West Eleventh Street <br /> An underground, 350-gallon, unleaded gasoline storage tank formerly located at 7777 <br /> West Eleventh Street was removed in July 1996 (John P. Cummings and Associates <br /> 1997). That site, which today forms part of the Piedmont Lumber (Truss Division) <br /> property at 7675 West Eleventh Street, was used from 1952 through the early 1990s as an <br /> auto wrecking yard and tire service facility. The soil found beneath the tank at the time it <br /> was removed contained 4,300 mg/Kg and 540 mg/Kg of TPH(g) at depths below grade of <br /> 6.5 ft and 10 ft., respectively. The tank pit was over-excavated to a depth of <br /> approximately 10 ft. BGS and the affected soil treated on site by aeration. A total of four <br /> groundwater-quality monitoring wells were installed at the site in November 1997; <br /> results obtained from those wells revealed that soil in the approximate area depicted on <br /> -a <br /> Figure 12 was affected, to depths not exceeding 5 ft., by concentrations TPH(g) that did <br /> not exceed 51 mg/Kg, with associated very low concentrations of the BTEX compounds. <br /> The concentration of gasoline in groundwater recovered in March 1999 from the <br /> monitoring well installed furthest down gradient from the former tank location (i.e., Well <br /> JCMW-3) was 650 µg/L, with commensurately low concentrations of the BTEX <br /> __. compounds. No MTBE was detected in the sample recovered from that well at that time, <br /> but concentrations of MTBE were recorded in groundwater beneath the site at <br /> concentration up to 5.6 µg/L (John P. Cummings and Associates 1999). <br /> 1 The SJCEHD and the RWQCB closed the case file for this site on November 9, 1999. <br /> Given the small area of the subsurface that was affected by fuel hydrocarbons and the <br /> low concentrations of analytes of concern detected in soil and groundwater, its distance <br /> from the 7500 West Eleventh Street site, and its essentially co-gradient location relative <br /> to that site, it is SJC's opinion that any the release of gasoline at the 7777 West Eleventh <br /> Street property has not intermingled with or come into close proximity with the plume of <br /> affected groundwater emanating from the 7500 West Eleventh Street site. <br /> 7.2.3 7685 West Eleventh Street <br /> On October 15, 1986, two underground storage tanks were removed from another <br /> location on what is today the Piedmont Lumber (Truss Division) property at 7685 West <br /> Eleventh Street. Their former locations are shown on Figure 12, just to the east of the <br /> building at 7685 West Eleventh Street. Those tanks had been owned by the Fayette <br /> Manufacturing Corporation, which had used the site to manufacture windmills for <br /> -r <br /> agricultural pumping and other applications. A hydrocarbon fuel product was found in <br /> the tank pit when the southermnost of the two tanks was exhumed (ATC Associates Inc. <br /> 1998). Subsequently, exploratory borings were drilled at the site and six groundwater- <br /> quality monitoring wells were installed. <br /> I Results of a round of groundwater sampling and analysis performed on June 14, 200.1 <br /> -. <br /> showed that groundwater in Monitoring Well ATCMW-2, at the location from which the <br /> storage tanks had been removed (see figure 12), was affected by 7,600 µg/L of TPH(g) <br /> with benzene, toluene, ethyl benzene and total xylene isomers at 1,300 µg/L, 69 µg/L, 34 <br /> µg/L and 150 µglL, respectively. In ATCMW-3, located some 40 ft. north of the former <br /> tanks, the concentration of TPH(g) was 950 µg/L, with benzene, ethyl benzene and total <br /> sic <br />
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