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ARCHIVED REPORTS XR0010227
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3500 - Local Oversight Program
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PR0544799
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ARCHIVED REPORTS XR0010227
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Last modified
11/19/2024 10:19:05 AM
Creation date
9/3/2019 3:28:52 PM
Metadata
Fields
Template:
EHD - Public
ProgramCode
3500 - Local Oversight Program
File Section
ARCHIVED REPORTS
FileName_PostFix
XR0010227
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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First Quarter 1998 Status Report - Former Discovery Chevrolet <br /> April 27, 1998 <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 /> PRESENT QUARTER FII+ELD ACTIVITIES <br /> Quarterly monitoring and sampling of the groundwater monitoring wells for the first quarter <br /> 1998 was performed on March 6, 1998. Field monitoring and chemical analytical data from <br /> 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. Well MW-3 is scheduled for annual sampling during the first quarter of <br /> each calendar year only. <br /> Groundwater Monitoring and Gradient Evaluation <br /> Depth-to-water (DTW) measurements were obtained from groundwater monitoring wells <br /> MW-1 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 9.15 and 10.12 feet bgs. These <br /> water-level data were used to construct a Potentiometric Map (Figure 3). Based on these <br /> data, the shallow groundwater beneath the subject site appears to flow toward the north at <br /> a gradient of approximately 0.004 ft/ft. Each well was inspected for the presence of floating <br /> product. Floating product or a product sheen was not observed in any of the groundwater <br /> 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-1, MW-2, MW-4, and MW-5 were analyzed for TPIIg by <br /> Environmental Protection Agency (EPA) Method 5030/GC-FID, and for benzene, toluene, <br /> ethylbenzene, and total xylenes (BTEX) and methyl tert-butyl ether (MTBE) by EPA Method <br /> 8020. The groundwater sample from well MW-3 was analyzed for BTEX and Total <br /> Petroleum Hydrocarbons as diesel (TPHd) only. The samples were analyzed by American <br /> Environmental Network (FLAP #1172) located in Pleasant Hill, California. <br /> TPHg, or MTBE were not detected in the groundwater samples collected from wells MW-4 <br /> or MW-5. Benzene was not detected in wells MW-3 or MW-5. TPHg were detected in <br /> wells MW-1 (270 ppb) and MW-2 (1,000 ppb). Benzene was also detected in these samples <br /> at 47 and 160 ppb, and in the groundwater sample from well MW-4 (0.$ ppb). MTBE were <br /> detected in the groundwater samples from wells MW-1 (5 ppb) and MW-2 (10 ppb). These <br /> data have been used to construct a TPI-Ig/Benzene/MTBE Concentration Map (Figure 4). <br /> 948146.05-5 3 <br />
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