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v a 17NAL REMEDIATION PIAN Shell Oil Company 620 West Charter Way,Stockton,California ' Delta Project No.40.66-586 Page 4 a Note that monitoring wells MW-2, MW-5, MW-7, MW-8, and MW-9 can be utilized for free product r - recovery or ground water recovery. Both cannot be accomplished simultaneously because only one air line s4r and fluid return line are present. i �A potriablc;ale-operated prcuduct skimmer pump lues beca orating at,the Site 'jAn air r� compressor and product recovery ves:el are located ir,the remedial equipment area shown in Figure 3. The skimmer pump can be moved to different walls (only the wells that are equipped with a subsurface compressed air line and fluid return line) in order ti,skim free-iloathig petroleum product from the we'.Is as necessary. The pump has been operating in MW-2 since its insta;lation,however,it was recently moved I to MW-7 because of changing product Ievels in the monitoring wells rTcr cEat $ roxtma#ef4'4$p Notts P >iP... of prod=have.beery recgvered. 3 t" 2.3 Well Inventory I A review of well records on File with the California Department of Water Resources indicatesAM#here are; r two -it V relle-radius of the site.^N municipal well,owned by the City of Stockton (City), is located near the intersection of Lincoln and Worth Streets,approximately 1,800 feet north(downgradient) t.x of the site. Well records show that a well located near the intersection of Center and Jefferson Streets, approximately 2,500 feet northeast (downgradient) of the site, is owned by the California Water Service � n Company. 2.4 Utilities The site lies within the City and is serviced by City water and sewer Iines. A 24-inch san;ary server line and a 16-inch asbestos/cement(AC)water line are present along.ire,)ela side Uf Charter Way. A 64 ch cast ... iror,water line exists 19 feet south of the centerline.along Charter'Way. Electrical and natural gas lines are present along the northern edge of'he property,immediafeiy south of the sidewalk. 2.5 Re tonal -Geolney and 111drogeology w The site lies within the Great Valley geomorphic province. The geologic materials beneath the region consist primarily of stream and delta plain deposits of the San Joaquin River and its tributaries(Norris and `,riNebb,1976). Surficial geology of the area consists of fluvial sands,silts,and clays,and is considered to be several hundred feet thick (Jennings, et al.. 1977). The San Joaquin County Flood Control and Water Conservation District Map for Spring 1989 indicates that the unconfined and semicanfined ground water aqu'rers in the vicinity of the site generally now to the northeast.