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ARCHIVED REPORTS XR0010280
EnvironmentalHealth
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3500 - Local Oversight Program
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PR0544799
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ARCHIVED REPORTS XR0010280
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Last modified
11/19/2024 10:19:06 AM
Creation date
9/3/2019 3:37:15 PM
Metadata
Fields
Template:
EHD - Public
ProgramCode
3500 - Local Oversight Program
File Section
ARCHIVED REPORTS
FileName_PostFix
XR0010280
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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EHD - Public
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Third Quarter 1998 Status Report - Former Discovery Chevrolet <br /> September 14, 1998 <br /> ppb. TPHg (41.5 ppb) and benzene (1.1 ppb) were detected. only once in well MW-4 <br /> (April, 1997), and have never been detected in well MW-5. Historical quarterly <br /> groundwater monitoring and chemical analytical data are summarized in Table 1. <br /> In August 7, 1998, Horizon Environmental Inc. over-excavated the former UST pit. Well <br /> MW-1 was destroyed to accommodate these activities. Analytical data from these activities <br /> have not been made available to GR. <br /> PRESENT QUARTER FIELD ACTIVITIES <br /> Quarterly monitoring and sampling of the groundwater monitoring wells for the third quarter <br /> 1998 was performed on September 8, 1998. Field monitoring and chemical analytical data <br /> from the current quarter are summarized in Table 1. Groundwater sampling procedures are <br /> summarized in Appendix A. Copies of the field data sheets are presented in Appendix B. <br /> Copies of the laboratory analytical report and completed chain-of-custody form are presented <br /> in Appendix C. <br /> Groundwater Monitoring and Gradient Evaluation <br /> Depth-to-water (DTW) measurements were obtained from groundwater monitoring wells <br /> MW-2 through MW-5 prior to well purging and sample collection. Static groundwater levels <br /> were measured from the north edge of the top of each well casing and recorded to the <br /> nearest +_0.01 foot. Groundwater was measured between 10.50 and 11.32 feet below the <br /> top of the well casings. These data were used to construct a Potentiometric Map (Figure 3). <br /> Based on these data, the shallow groundwater beneath the subject site appears to flow toward <br /> the north at a gradient of approximately 0.004 ft/ft. Each well was inspected for the <br /> presence of floating product. Floating product or a product sheen was not observed in any <br /> of the groundwater monitoring wells this quarter. <br /> Laboratory Analytical Data <br /> The groundwater samples were collected in sample containers supplied by the laboratory. <br /> Samples from wells MW-2 through MW-5 were analyzed for TPHg, for benzene, toluene, <br /> ethylbenzene, and total xylenes (BTEX), and for methyl tent-butyl ether (MTBE) by <br /> Environmental Protection Agency (EPA) Methods 8015 Mod./8020. The samples were <br /> analyzed by Sequoia Analytical (FLAP #1210) located in Redwood City, California. <br /> TPHg, benzene, or MTBE were not detected in the groundwater samples collected from <br /> wells MW-3, MW-4 or MW-5. The sample from well MW-2 contained TPHg (81 ppb), <br /> benzene (18 ppb), and MTBE (25 ppb). These data have been used to construct a <br /> TPHg/Benzene/MTBE Concentration Map (Figure 4). <br /> 948146.05-7 3 <br />
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