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I <br /> `L) <br /> BUSINESS PLAN <br /> AND <br /> �"JWOMMENDATION FOR SITE REMEDIATIONI, <br /> �U ^ <br /> 011 <br /> a�L <br /> SEWXICE STATION DETAILS <br /> SS#9 - 1918 Leased Property <br /> 45 E. Harding Way, Stockton, CA Access Fee: $1500/mo. <br /> ;i <br /> SITE HISTORY <br /> 1940's - SS Built;complete tankage unknown <br /> 1984 - SS remodeled - 4 swf UST's installed: 3 - 10,000 gal. gas; 1 - 1,000 gal. w.o. <br /> 11/87 - soil vapor survey performed <br /> 2/88 - SS demo'd. - 4 swf UST's removed. Overexcavation to 25' <br /> 11/88 - monitoring wells MW-1 through MW-6 installed. Discovered 3 addt'l. steel UST's <br /> 12/88 - removed 3 steel UST's <br /> 1/89 - monitoring wells MW-7, MW-8, and vapor extraction wells V-1 thru V-5 installed <br /> 4/89 - SVE pilot vent test performed f <br /> 11/90 - SVE operation begins yl <br /> 7/91 - MW-9 installed <br /> 2/92 - SVE operation stopped <br /> 5/92 - monitoring wells MW-10,MW-11 and vapor extraction well V-6 installed <br /> 9/92 - SVE restarted <br /> 11/92 - SVE stopped, removed o?:-L rl c 5 KE-%0,Ln = 2 , 00 o lbs <br /> 6/93 - monitoring wells MW-12 and MW-13 installed <br /> 12/93 - monitoring wells MW-2R, MW-14 and soil borings SB-1, SB-2, and SB-3 installed 'I <br /> 12/93 - discovered addt'l. steel UST, <br /> 2/94 - above grade geophysical survey performed; steel piping detected i <br /> 3/94 - one steel UST and piping removed <br /> 5/94 - soil borings SB-4 through SB-9 installed <br /> o `'t I�� 1 �7ri�+}ter r ✓�' <br /> ENVIRONMENTAL/TECHNICAL <br /> Soil Analytical Results (see attached) j <br /> Groundwater Analytical Results (see attached) I <br /> DTW: 35' - 58' gradient 0.003 ft/ft NE sat./vadose zone lith.: sandy clays,silty sands <br /> Groundwater plume defined: YES (not migrating;extent decreasing) " <br /> li <br /> Groundwater contaminant levels: TPHG: ND - 80 ppb Benzene: ND <br /> - .A <br />