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ARCHIVED REPORTS XR0010245
EnvironmentalHealth
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3500 - Local Oversight Program
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PR0544799
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ARCHIVED REPORTS XR0010245
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Last modified
11/19/2024 10:19:06 AM
Creation date
9/3/2019 3:32:22 PM
Metadata
Fields
Template:
EHD - Public
ProgramCode
3500 - Local Oversight Program
File Section
ARCHIVED REPORTS
FileName_PostFix
XR0010245
RECORD_ID
PR0544799
PE
3528
FACILITY_ID
FA0003872
FACILITY_NAME
DISCOVERY CHEVROLET
STREET_NUMBER
1615
Direction
W
STREET_NAME
ELEVENTH
STREET_TYPE
ST
City
TRACY
Zip
95376
APN
23227019
CURRENT_STATUS
02
SITE_LOCATION
1615 W ELEVENTH ST
P_LOCATION
03
P_DISTRICT
005
QC Status
Approved
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SJGOV\wng
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EHD - Public
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Third Quarter 1996 Status Report-Former Discovery Chevrolet <br /> September 23, 1996 <br /> Previous Environmental Work <br /> Based on information supplied by Ms. Nokes, we understand that the three USTs were <br /> removed in April 1993. Four soil.samples were-collected from the base of the gasoline UST <br /> excavation at depths of approximately 9 to 10 feet below ground surface (bgs), one soil <br /> sample was collected from beneath the product dispenser at approximately 5.5 feet bgs, and <br /> one soil sample was collected from the base of the waste oil UST excavation at <br /> approximately 7.5 feet bgs. Groundwater was not encountered during. UST removal. <br /> Information supplied by SJCEHD indicates that the product piping that ran from the gasoline <br /> USTs to the dispenser, located inside the service bays, was left in place beneath the concrete <br /> apron outside the shop building. <br /> Petroleum hydrocarbons were detected in all soil samples collected during the UST removal. <br /> Soil samples collected from. the gasoline UST excavation contained Total Petroleum <br /> Hydrocarbons as gasoline (TPHg) at concentrations ranging from 920 to 4,400 part per <br /> million (ppm). Benzene was detected in all these soil samples at concentrations ranging from <br /> 5.9 to 39 ppm. Total lead was detected in two of these soil samples at concentrations of 19 <br /> and 4.0 ppm. TPHg and benzene were detected in the soil sample collected beneath the <br /> product dispenser at concentrations of 21 and 0.88 ppm, respectively. TPHg, Total <br /> Petroleum Hydrocarbons as Diesel (TPHd), and benzene were detected in the soil sample <br /> from the waste oil excavation at concentrations of 31, 270 and 0.18 ppm, respectively. <br /> Tetrachlororoethene (72 parts per billion, or ppb), lead (7.8 ppm), and chromium (9.2 ppm) <br /> were also detected in this sample. <br /> Based on results of soil sample analyses from the UST removal, GSI performed a <br /> preliminary site assessment to further evaluate hydrocarbons in the soil and to evaluate <br /> whether hydrocarbons had impacted groundwater beneath the site. Three on-site <br /> groundwater monitoring wells were installed at.the locations shown on the Site Plan(Figure <br /> 2) in September 1994. One soil sample from approximately 10 bgs in each soil boring was <br /> submitted. for analysis. TPHg were detected in the soil sample from boring MW-1 (340 <br /> ppm) and MW-2 (240 ppm). The.benzene concentrations in these samples were 3.9 and 2.4 <br /> ppm, respectively: Petroleum hydrocarbons were not detected in the soil sample from boring <br /> MW-3. Groundwater in the newly installed wells was measured between 9.97 and 10.49 feet <br /> bgs, and appeared'to flow north-northeast at a gradient of 0.003. Floating product was not <br /> observed in the monitoring wells. TPHg was detected in the groundwater sample collected <br /> from well MW-1 (640 parts per billion, or ppb) and MW-2 (7,200 ppb). The benzene <br /> concentrations in these samples were 35 and 370 ppb, respectively. Petroleum hydrocarbons <br /> were not detected in the groundwater sample collected from well MW-3. Results of that <br /> investigation were reported in GSI Report No. 8146.701-1, Preliminary Environmental <br /> Investigation Report, dated. December 7, 1994. Depth-to-groundwater and chemical <br /> analytical data are summarized in Table 1. <br /> 8146.03-3 2 <br />
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