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15 December 2000 AGl -NC' Project No. 98-0504 1'agc i of 7 '.�. S1TIT, HYDROGEOLOGIC CONDITIONS ]-he closest surface eater fcaturc to the site is Smith Canal and Yosemite Eake, located approximately 1.500 feet northwest ol'the site. Water fi-otn Smith Canal drains into the San Joaquin River Deep Water Channel and is primarily used Ior commercial and recreational boatinu. Based upon ground water monitoring Nvcll information obtained from 248 West Harding Wav (;00 feet v�est ofthe site). ground water flow direction is northeasterly to easternty and euI-rently occul's at a depth of approximately 25 feet bso within ground water wells. Ground water occul-s in a gcnerally sandy ]aver extending from approximately 35 feet bsg to 45 feet hsg (248 West Harding). The sedimentan' units are thought to be relatively horizontal and continuous over the arca. 2.6. FZEGIONAL GEOLOGIC CONDITIONS The site is situated Within the Great Valley Geomorphic Province of California, a far11c. elongate northwest ternding, asymmetric structural trough. The {.heat Valley Province has been filled with thick sequences of sediment ranging in age fi-oln Jurassic to recent. creating a ne�►rly flat lying alluvial plain. which extends from the Tehachapi Mountains in the south to the Klamath Mountains in the north. The western and eastern boundaries of this province are comprised of the California Coast Ranee and the Sierra Nevada, respectively. Rocks composing the hascmcnt complex of tile province have not been completely defined but are believed to he of nictamorphic and i�aneous origin. ']'lie Great Valley Province has been subdivided into two major divisions identified as the Sacramento and San Joaquin Valleys. fhe lvlodcsto, Riverbank and TLII-Iock Lake Formations and overlying recent alluvium are the principal sources of domestic ground water in the 13,500-square mile San Joaquin Valley Ground Water Basin (Basin 5-22j, This basin is drained primarily by the San Joaquin 1iver. 3.10. SCOPE OF WORK Based on analytical data from the tJST System removal. oyer-excavation and installation at the site, tilt P1IS-fHD has requested a soil and ground water investigation he conducted to define the lateral .rnd vertical extent of the petroleum hydrocarbon contamination at the site. A significant livdrocarbon-impact to soil has been cttcountcred in the north end of the UST excavation and at the �yestern edge of the site. I'hescope ofthe .kork inctudcs the advancement of five soil probe borings Ior the collection of soil and grah LWound water samples. These samptes %will determine if ground water is impacted at the site and aide in determining suitable locutions for any necessary ground water monitoring. "yells. -1drunre d Gcul;FIN irunmen tal.Inc.