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i <br /> y January 18, 2001 <br /> w , <br /> WALLACE-KUHL <br /> Gr ASSOCIATES INC Ms. Carol Oz <br /> San Joaquin County Public Health Services Department <br /> Geotechnical Engineering <br /> r2 <br /> 304 East Weber Avenue,Third Floor <br /> ; Enguu�erwg Geology Stockton, California 95202 <br /> �r <br /> Eovlronlnental Consulting <br /> P Additional Report of Findings and Request for Site Closure <br /> �t��f Remedl�tlrn! ;elvlces <br /> 1444 MARIPOSA ROAD <br /> Stockton,California <br /> Call-tinction Inspectlan <br /> e WKA No.2938.07 <br /> >✓ �� Pa9-Itell,Is Testing <br /> Yl:. <br /> 3' As required by San Joaquin County Public Health Services Department <br /> = f; (SJCPHSD),we have completed an additional round of groundwater sampling for <br /> monitoring wells MW2 and MW7 at the above site(Plate 1). <br /> Groundwater samples were obtained from monitoring wells MW2 and MW7 on <br /> October 25, 2000(Plate 2). Prior to purging and sampling,the water level in each <br /> well was measured with an electronic water level indicator and checked for visual <br /> signs of free product using a clean, disposable polyethylene bailer. No free <br /> product or sheen was observed in either well Prior to sampling, approximately <br /> three casing volumes of water were removed from the wells. Groundwater <br /> samples were then collected using new polyethylene disposable bailers and <br /> decanted into appropriate sampling containers provided by the analytical <br /> laboratory. <br /> The samples were immediately placed in an ice-chest containing ice and submitted <br /> under chain-of-custody to a California Department of Health Services certified <br /> laboratory for analysis of Total Petroleum Hydrocarbons(TPH) as gasoline, <br /> Benzene, Toluene,Ethylbenzene, and Total Xylenes(BTEX), Tert-Butanol,Methyl <br /> L(i�r'cRAI E Uthlc, tert-Butyl Ether(ETBE),Di-isopropyl Ether(DIPE),Ethyl tert Butyl Ether <br /> 'I',°III`I`"t!!al I311d (ETBE), Tert-Amyl methyl Ether(TAME) Ethanol,Methanol(fuel oxygenates) <br /> We-t b Ic! vnel�to <br /> GA`;a)91 and 1,2-Dichlorobenzene(1,2-DCA)using EPA Method 82608. All water <br /> rel9v)371113! <br /> I-a f 1,tt>-372 2565 removed during purging operations was placed in a sealed, labeled 55-gallon drum <br /> k()d«11! 0FI-1(E and stored on-site. <br /> 11o6 h If IIID 0f 1L0 <br /> )lilt,100 <br /> I ti rl 1111 ( G5 p <br /> I <br />