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�'-' �c' '-"„•.tu+a"'*^.'rirat°a''" <br />�r- <br /> F <br /> CALIFORNIA GEOPHYSICAL GROUP, INC. Tel. (619)486-1323 <br /> 12709 Pov aX . Seile 202,Poway,CA 92064 <br /> WORK PLAN <br /> FOR <br /> GASCO SERVICE STATION <br /> 749 E. CHARTER WAY 1E�}1�1 t1�A-i <br /> STOCKTON, CALIFORNIA tiNdp Roll <br /> December 11, 1991 <br /> SITE HISTORY <br /> On November 14, 1989 the following tanks were removed from the <br /> site in accordance with the Tri--Regional Recommendations: <br /> 1 8,000 Gal. Unleaded Gasoline <br /> 1 5,000 Gal. Super Unleaded Gasoline <br /> 2 5,000 Gal. unleaded Gasoline <br /> A, total of 6 soil samples were taken two under each tank and <br /> analyzed for THP, and BTX&E. The lab results previously <br /> reported varied from 1.9 to 3600 FPM for TPH, <br /> Therefore, it was <br /> resolved that the site is a Case # 1 site and in a Category 01 <br /> area with the water table located at about 39 feet below the <br /> surface. <br /> The excavation site was backfilled with the original soil Plus <br /> soil from a new excavation. The site was then remodeled and <br /> placed back in service. <br /> On Dec. 1989 an Electromagnetic Induction survey was <br /> conducted on the site to aid the investigation of the areal <br /> assist in locating the ground water <br /> extent of the plume and <br /> monitoring wells. <br /> A work plan for assessing the contamination of the site was sent <br /> the the San Joaquin Local Health Department of Dec. 29, 1389 <br /> along with a well drilling permit. The plan was accepted and a <br /> special well permit was issued on Jan. 19, 1990. <br /> Drilling and :sampling according to the work plan began on Jan. <br /> 22, 1990. A Site Assessment report was <br /> submitted to San .Joaquin County Health on February 9, <br /> 1990. On <br /> and Finished on Jan 26, <br /> October 1, 1990 we began quarterly sampling but by that time <br /> `r the water table had dropped below the bottom of the wells and <br /> has remained below the wells to this time. Therefore this work <br /> plan is presented theto drill 3 present groandwaterlsoells thatathehwaterecanlch <br /> be <br /> will Penetrate h p <br /> monitored and a remediation plan can be presented. <br /> SCOPE OF WORK <br /> wells {BM-4,5,ty, 6) will be drilled <br /> .✓ Three additional monitoring <br /> in accordance with Plot 1 the well design, and Plat 2 thy_ well <br /> location. The wells will be eased with <br /> Pvr; casing and the <br /> slatted portion will extend from the bott61, of the well to. <br /> within 10 feet of the surface of the ground. 'These wells will °�' <br />