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SUBSURFACE SOIL AND GROUNDWATER ASSESSMENT REPORT <br /> TABLE 3 <br /> MUNICIPAL GROUNDWATER WELLS <br /> WELL NAME WELL LOCATION DEPTH <br /> UOP Pharmacy Well#3 Brookside/Pacific Ave 510 feet <br /> UOP Burns Tower Well#2 Pacific Ave/Knoles 502 feet <br /> CA Water Service Well#4-01 Ellis/Bonnie Lane 548 feet <br /> CA Water Service Well#18-01 Atlee/Commerce St 408 feet <br /> CA Water Service Well#26-01 Wyandotte/Commerce St 405 feet <br /> CA Water Seance Well#27-01 Pershing/Telegraph Ave 400 feet <br /> CA Water Service Well#31-01 La Jolla/Grange Ave 517 feet <br /> CA Water Service Well#36-01 Manchester/Churchill St 535 feet <br /> CA Water Service Well#38-01 Commerce North of Essex St 503 feet <br /> CA Water Service Well#47-01 Bianchi East of Bidwell PI 519 feet <br /> 1 CA Water Service Well#49-01 Brookside West of Crown 512 feet <br /> CA Water Service Well#66-01 EI Dorado/Ingram St 510 feet <br /> CA Water Service Well#66-02 EI DoradolIngram St 520 feet <br /> INVESTIGATION AND FINDINGS <br /> SUBSURFACE SOIL AND GROUNDWATER SAMPLING <br /> As shown in Figure 4, ESA installed five soil borings at the former UST location Soil boring <br /> TP-1 was placed in the center of the former excavation to assess soil and groundwater conditions <br /> ' beneath previously excavated areas ESA placed TP-2 through TP-5 approximately 15 feet from <br /> TP-1 along the previous excavation perimeter as shown in Figure 4 TP-4 and TP-5 were <br /> intended to assess soils and groundwater conditions at either ends of the former UST <br /> ' Reportedly,the former UST had the fill pipe installed on the south end and the vent pipe exiting <br /> on the north end Soil borings TP-2 and TP-3 were drilled on the east and west sides of the <br /> former UST to determine whether impact from MTBE had migrated laterally beyond the limits of <br /> ' the excavation <br /> Soil conditions were observed in continuous cores from the surface to maximum depths ranging <br /> ' from 20 to 24 feet bgs As shown in Appendix A, native subsurface materials generally consisted <br /> of fine-grained materials consisting of clayey sandy silt Backfill materials encountered in the <br /> UST excavation consisted of heterogeneous mixtures or pea gravel, compacted silty clay, and <br /> ' sand The consistency of the UST excavation backfill materials was typically much looser than <br /> the native materials No indications of petroleum impacted soil (staining or odors) were <br /> identified in any of the soil borings during drilling operations <br /> Following the completion to depth of each soil boring, a Hydro-punch in-situ groundwater <br /> sampling tool was driven into the groundwater bearing zone from depths ranging from 20 to 24 <br /> feet bgs Groundwater extracted from each soil boring appeared relatively free of sediment and <br /> ESA field personnel did not detect petroleum odors or hydrocarbon sheen on the water samples <br /> Subsurface Soil and Groundwater Assessment ESA1200252 <br /> ' 1081 W Mendocino Avenue Stockton,California 7 August 25 2000 <br />