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ARCHIVED REPORTS_XR0004383
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PR0539293
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ARCHIVED REPORTS_XR0004383
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Last modified
11/20/2019 3:28:14 PM
Creation date
11/20/2019 3:20:49 PM
Metadata
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Template:
EHD - Public
ProgramCode
2900 - Site Mitigation Program
File Section
ARCHIVED REPORTS
FileName_PostFix
XR0004383
RECORD_ID
PR0539293
PE
2957
FACILITY_ID
FA0022465
FACILITY_NAME
VALLEY MOTORS
STREET_NUMBER
800
Direction
E
STREET_NAME
MAIN
City
STOCKTON
Zip
95202
CURRENT_STATUS
01
SITE_LOCATION
800 E MAIN
P_LOCATION
01
P_DISTRICT
001
QC Status
Approved
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SJGOV\wng
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EHD - Public
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. EXECUTIVE SUMMARY <br /> Upgradient Environmental Consultants visited the Valley Motors dealership on December l 1 to <br /> measure water depths and collect groundwater samples The depth to groundwater is about 2 feet <br /> greater than it was in September, and now averages about 33 feet below grade Depth <br /> measurements indicate that groundwater currently flows to the northeast Historically, the flow <br /> direction has varied from northeast to southeast <br /> After the depth to groundwater was measured,the four morutonng wells were sampled with <br /> disposable Teflon bailers and the samples were poured into 40-m1 vials The samples were <br /> transported to Excelchem Environmental Laboratory and analyzed for TPH-gasoline using EPA <br /> method 602 and for BTEX using EPA method 8020 <br /> Hydrocarbon concentrations declined slightly in VM-I and VM-3 and remained essentially <br /> unchanged in VM-4 A larger decline was observed in VM-2, but concentrations in this well remain <br /> elevated (TPH-g= 59,000 µg/l,total BTEX=2 1,100 µg11) <br /> Hydrocarbon concentrations in two wells were plotted against time In the well nearest the former <br /> dispenser island (VM-2), concentrations have fluctuated up and down from quarter to quarter but <br /> there has been an overall increase in both TPH-g and BTEX concentrations since 1998 The <br /> magnitude of the quarter-to-quarter fluctuations has increased during that period Concentrations in <br /> the well nearest the former underground storage tanks (VM-1)have not followed the pattern in <br /> VM-2 The TPH-g concentration remained relatively constant from September 1995 until <br /> September 1998, but then increased sharply at the end of 1998 In early 1999, the concentration <br /> began a general decline and has now returned to the 1995 level In contrast, BTEX concentrations <br /> decreased at the end of 1998 while the TPH-g concentration was increasing In early 2000, BTEX <br /> concentrations began rising while the TPH-g concentration was declining This out-of-phase pattern <br /> ended at the end of 2000, and during 2001 TPH-g and BTEX concentrations increased and <br /> decreased in concert <br /> • <br /> 1 r ', <br />
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