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Plarth <br /> err+ralifornia Regiofn3J()fiCe 41674 Christy Street,Fremont,CA 94538-3114 (41.5)659-0404 Fax:(415)651-4677 Lic.#596545 <br /> � <br /> 15, 1991 6AII r r'lt <br /> February R c S �! <br /> San Joaquin County <br /> Fublic Health Services <br /> P.O. Box 2009 <br /> Stockton,CA 95201 <br /> Attention: Mr. Steven K. Schneider,R24-H.S. <br /> Environmental Health Specialist <br /> Subject: Perched Aquifer and1Monitoring Well Screened Intervals <br /> Quik Stop Market <br /> 3555 W.Hammer Lane,Stockton,C�lirornia <br /> Excelteeh Project No.3-49132-31 <br /> Dear Mr.Schneider: further <br /> letter is in phone conversation of Fe <br /> reference to our bruary 1, 1991, regarding <br /> This ed site. As mentioned in our discussion,n eltechdated�0 October would <br /> Investigti , <br /> investigation at the above-referenc <br /> like to modify its Phase 3 Work Plan for Soil and Groundwater <br /> 1990,with regard to Site Code 1130. <br /> resence of a perched <br /> term letter of November 1, 1990,to Ms.adidresAih possab�lity to tho thatpfurther investigation <br /> After y before we could properly <br /> would be necessarythe site <br /> aquifer beneath the site. Further <br /> removal of underground n proeess,additional <br /> sdiitin nformation <br /> November 15, n of <br /> 1990, including bckfill area. During this excavation process, <br /> cr ntaminated sod.in the tank h of the site. We feel that this information,coupled with the <br /> was gained regarding the stratigrap y and <br /> logs,monitoring%-'ell construction details,�a a conditions at Ns site. <br /> data,has resulted to a <br /> boring g of the existing subs <br /> more thorough understanding <br /> drillin of the borehole for MW-I on August 23, 1990, wet soils were observed i,�! <br /> During theg <br /> sand soil sample collected from a depth of 15 to I6-1J2 f tided s nd e��Tc�eTnstaliahis ton of <br /> y a silt clay overlyiP.g a clean, well-gr have <br /> was underlain by Y zones. In other <br /> groundwater monitoring well MW-1,further bo wbll acr cross water-beaneng zohatnes. <br /> We may <br /> r <br /> extended the slotted portion of the monitoring <br /> exploratory borings, this clayey soil was again encountered between two etsandy so <br /> n MW-I appeared to possibly cross connect two <br /> however, in these instances, no water was encountered in the sandy soils above this clayey soil. <br /> According to this somewhat limited info <br /> water-bearing sandy units and was destroyed on Goober 3,1990• completed and the <br /> de th of approximately 16 to 17 feet below i(Figure l�this <br /> In November 1990,file tank removal and excavation of contaminated soil wasthe <br /> tank backfill area was excavated to p oundwster and the very strong <br /> During this excavation process,.in the area located roughly between B-3 and g <br /> clayey soil was encountered aril due to the absence or an - <br /> Recyclable and made from recycled PaPe9- �1 <br />