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gi <br /> elf <br /> Envir nMental <br /> consultants,Inc. <br /> 3300 Data Drive,Suite 100 <br /> Rancho Cordova.CA 95670 r - <br /> 916/638-2005 <br /> FAX:9161630-8:905 <br /> March 1,1991 <br /> Ms.Diane Hinson,R.E,H.S. <br /> Department of Environmental Health <br /> San Joagain County Public Health Services <br /> P.G.Bax 2009 <br /> Stockton,California 95201 <br /> Subject: Quarterly Ground WateSSocktan,California <br /> 620 Wt <br /> West C11mrter Way, <br /> Shell WIC No.2044524-4305 <br /> Delta Projert loo.40-W58 <br /> Dear lvls.Hinson: <br /> Inc., authorized by 5hc11 Oil Cor,YpanY to conduct an <br /> Delta Environmental Consul".ants, has been <br /> harter <br /> investigation of soil and ground water conditions atia Shelvcat gationais intende`] tolocatud at 6chara20 cterize the <br /> Way, Stockton, California (Figures 1 a ) scent to the site. This <br /> water erCormcd at the site on <br /> distribution of petroleumconstituents in soil and of ground waaterds mpling activities P i <br /> !attar report summarizes <br /> titled in Figure 2. All other wells contained free-phase hoarlfi$ <br /> January 31,1991. Quarterly ground enter samples were co!lectcd from existing monitoring wells <br /> MW-5,MW-6,MW-S,and MW-9 td <br /> product. <br /> Water,Level De th ;*{►w i2tinn <br /> r!11 rlraulic C.rndlent <br /> 1991. Ground water levet measurements ma econ,piled in Table 1. A lf oo <br /> Ground water leve!measurements were made mai slily between November and December 1990.Figura 3 <br /> depicts the ground water contours for]anuarying <br /> all monitoring wells throughout a cortin ous declthe p05 <br /> ii c i�rLlion of this twater elevatdureiiO c Oyer <br /> it moaa o rng�Nells <br /> this hrstariesl data(Figure ) <br /> by approximately 2 to 5 feet in the wells. The plot also shows Wells. <br /> We <br /> y app and MW-5 relative to the historical trend for these wells. We expect future clevet{ons measured <br /> follow the historical trend- <br /> in the":wells will <br /> Sub active Ann! sts find Gmund Water Smm�i� ..irfprmt d during each <br /> Ich well was <br /> A subjective analysOs nr�atoround water methods drscribcd in Enclosure ure A.LT Table I lists the deptcollected from h of fret-phase <br /> �f sampling event ac b MW-3,N[W4,and MW-7• Figure 5 depicts <br /> petroleum product measured in m^niton ng wells In addition to the Crcr:-phase product in monitoring <br /> the inferred extent of product beneath < �t sheen was observed in monitoring well MW9 duripg <br /> wells MW-2,MW-3,MW 4,and MW-7, <br /> the period. <br />