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' L _.,...moi' �."��'s(��'](�`'�.t i:'xi1`41`j"7�i r�`�`s iI�!+•'.S-'i{I <br /> J F•�.l� lrl1,9 R,I iAiw i <br /> 0 GROUNDWATER <br /> EIELITECHNOLOGYjINC• 1401 Halyard Drive,Suite 140,West Sacramento,CA 95691,(916)372-4700 <br /> FAX(916)372-8781 ; <br /> November 5, _ Project No. 02020 3767 <br /> E <br /> f <br /> Ms. Lauri A. C ulla <br /> REHS, 'Pr ra Manager <br /> San Joaqu n ounty Public Health Services <br /> 1601 East elton Avenue <br /> Stockton, lifornia 95205 <br /> .mac <br /> SUBJECT: OUTHLAND STORE NO. 20344 <br /> 455 GRANT LINE ROAD <br /> TRACY, CALIFORNIA <br /> Dear Ms. Cotulla: <br /> Groundwater Technology, Inc. has prepared:this letter on behalf of The.Southland Corporation to <br /> r <br /> request abandonment of selected wells, and rescheduling of other wells to annual sampling at the above <br /> referenced site (Figure 2). The results of quarterly groundwater sampling conducted at the site over the <br /> past several years reveal that many of.the wells continue to remain below laboratory method detection <br /> limits.(MDL) for dissolved benzene, toluene, ethylbenzene, and xylenes (BTEX), and total petroleum <br /> i <br /> hydrocarbons-as-gasoline (TPH-G). .Wells MW-4, 6, 11, 12, 13, 14, and 15 have never had dissolved ' <br /> hydrocarbon concentrations above the MpLs. Similarly, MW-2, 'MW-3, and MW5 have had only One or <br /> two reported BTEX or TPH-G concentrations at or slightly exceeding the MDLs (Table 1). <br /> E Due to the current monitoring well array, an overcoverage of the "zero-line" for dissolved petroleum <br /> hydrocarbons exists to the north-northeast and south of the dissolved plume center (around MW-10). <br />€ Groundwater Technology requests approval for abandonment of wells MW-12, MW-13, MW-14, and <br /> MW-15 across the northern extent of the property. The zero-line can be adequately defined in this <br /> area by monitoring and sampling MW-9, which has remained below MDLs for several consecutive <br /> quarters{fable 1). MW-4 to the south (upgradient) of.the plume center has never had reported <br /> concentrations for dissolved petroleum hydrocarbons.and should be abandoned as well. <br /> Of the remaining perimeter wells (MW-2, MW-3,.MW-5, MW-6, and W1 1), it is requested that these <br /> wells.be switched to an annual groundwater sampling schedule due to consistent nondetectable levels. i <br /> The remaining wells at the site would continue tote sampled on a quarterly schedule. <br /> Offices throughout the U.S.,Canada and Overseas q� <br /> ' - 1 <br /> i <br />