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S ESC0 R f 7-Eleven Store 432262 Site Assessment Report December 12, 2003 Page 6 MW-6D A groundwater hydrocarbon concentration map is presented as Figure 4 Copies of the laboratory reports are included in Attachment E WATER SUPPLY WELL SEARCH Department of Water Resources SECOR visited the Department of Water Resources (DWR) Central District office in Sacramento, California, to review copies of the Water Well Driller's Reports to identify water supply wells that + potentially lie within a 2,000-foot radius of the site The 2,000-foot search radius was conducted within Township 2 South, Range 5 East, and the southeast quarter of Section 18 and northeast quarter of Section 19 A review of the DWR well logs identified six wells located within a 2,000-foot radius of the site (Figure 5 and Table 4) The well logs provided an approximate location, age, and construction specifications of each well City of Tracy SECOR interviewed the City of Tracy Water District to identify the location of any city-owned or operated wells that may be within 2,000 feet of the site According to the water district, one municipal well is located at the intersection of Grant Line Road and Tracy Boulevard, approximately 1 3 miles east (crossgradient) of the site A field search verified the municipal well location Field Verification On August 26, 2003, SECOR visited the site to verify the location of six domestic water supply wells identified in the DWR well logs Five of the six well locations were confirmed at the addresses listed in Table 4 At each location, a pump tank was observed on the property The sixth well location V could not be confirmed because the residence was inaccessible due to a gated driveway SECOR personnel drove public streets within the 2,000-foot search radius and did not observe any other wells visible from public right-of-ways , Sensitive Receptors x During the field search, SECOR looked for surface bodies of water that could act as a receptor such as ponds, lakes, streams, rivers, and canals No surface bodies of water were identified as a sensitive receptor within 2,000 feet of the site SECOR also did not identify any public schools within the 2,000-foot search radius SUMMARY AND CONCLUSIONS Groundwater monitoring wells MWA through MW-5, and MW-6D, were installed on October 15-17, 2003 Soil samples collected from borings MW-1 through MW-6D did not contain TPHg or BTEX above laboratory reporting limits The lateral limits of MtBE in soil have not been defined to the north, east, and west due to MtBE concentrations in soil samples collected from MW-2, MW-3, MW- 5, and MW-61) 4! 32262 Assessment Report SECOR tntemationat incorporated a �r h