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• ■ Investigation, excavation, and disposal of diesel-impacted soil located <br /> adjacent to the former diesel fuel dispenser island, <br /> ■ Destruction and sealing of three pre-existing monitoring wells that were <br /> potentially contributing to groundwater impacts, <br /> ■ -Installation, development, and sampling of three new monitoring wells, <br /> ■ Laboratory analysis of groundwater samples; and <br /> ■ Installation of a groundwater treatment system <br /> 1.4 Site Geology <br /> The SSA site is located in the San Joaquin Valley, the southern portion of the Great <br /> Valley geomorphic province The Great Valley is an asymmetrical structural trough into <br /> which large quantities of marine, alluvial fan and stream sediments have been deposited. <br /> The Diablo Mountain Range (part of the Coast Ranges province) borders the west side of <br /> the Great Valley, and the Sierra Nevada province borders the east The site is situated on <br /> the eastern margin of the San Joaquin/Sacramento River delta. <br /> The soil conditions were relatively consistent across the site The shallow soil <br /> consisted primarily of brown, stiff to very stiff and most silty clay with varying silt and sand <br /> contents At a depth of about 20 to 25 bgs, moist and generally stiff/dense bluish to <br /> greenish gray clay and interbedded clayey sand beds were encountered. In boring B-5 at <br /> depths between 32 to 35 bgs, a wet, well-sorted sand lens was noted A stiff to very stiff <br /> blue-gray silty clay extended to a total depth of 40 to 45 feet bgs This deepest observed <br /> unit was generally moist, however fractures containing free water were noted in boring B-5 <br /> Boring logs are included in Appendix A <br /> • <br /> FASCLOSE 1 1-3 92-1177102 36 <br />