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20,1 <br /> r ON)E D WORK PLAN FOR 11M(Tffi ADrATMAL SASSESSMENT <br /> 1599 East Yasemlta Avenua.Manteca.Caldwria <br /> Ali drill cuttings will be stored temporarily on site on top of and covered by plastic <br /> sheeting pending laboratory analysis of the boring samples. Additional sampling and <br /> testing of the stockpiled soil may be required in order to meet landfill disposal criteria. <br /> `y Following receipt of the laboratory results, the drill cuttings will be transported from the <br /> site by a state-licensed hauler to an appropriate disposal facility. <br /> Upon completion of drilling, any bore holes not utilized for monitoring well construction <br /> will be backfilled with a 9-sack slurry. The slurry will not free fall more than ten (10) feet. <br /> The slurry will be placed by tremie to depths greater than ten (10) feet. <br /> GROUNDWATER MONITORING WELL. CONSTRUCTION <br /> For the proposed groundwater monitoring wells MW-4 and MW-5, approximately 20 feet <br /> of 4-inch-diameter PVC screen with 0.020 inch slots <br /> will <br /> bei tabled from he bottom of <br /> the boring to approximately 5 feet above the <br /> Fcr the proposed groundwater monitoring well/vapor extraction well MW-1 B, <br /> -inch slots will be instal <br /> appf,oximately 20 feet of 6-inch-diameter PVC esc 5{ewabove2th �a observed water tabled <br /> from the bottom of the boring to approx y <br /> or <br /> Figure 4 shows a typical monitoring well construction detail. Solid-walled, rf e. <br /> 6-inch,diameter PVC will be installed from the and of ndew`Ilscreened <br /> placed totothe su <br /> an ele at�n <br /> The filter will consist of No.3 Lonestar <br /> of the screen. The approximate volume of sand <br /> approxirnataly 2 feet above the top <br /> necessary to construct the filter will be calculat bean la ed onorder tol toptot he filter packr orrlan <br /> during filter placement. Bentonite pellets w p <br /> -cement grout will be placed from the top of the <br /> approximate 2 feet interval. Asand <br /> Bentonite pellets to the surface. <br /> The monitoring wells will be developed, purged and sampled in accordance with Aegis' <br /> ater samwlells will then be surveyed and atlaboratory levels wirmeasured.be a <br /> analys. The <br /> SOP. Groundwsured. <br /> groundwater monitoring <br /> um <br /> The water samples will be analyzed for concentrations of: a) total enesua d elthylbenzeene <br /> hydrocarbons, as gasoline (TPPH); b) benzene, toluene, CAL DHS <br /> (BTX&E) and c) ethylene dibromide and 1-2 dichlorosane (EDB & EDC), by <br /> DRAFT TPH (modified) and EPA Method 8240 (.(3G/MS). <br /> - - <br /> .4. <br /> 90v08A.waN -- <br />