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_� zx rX- _ .Js✓ an Y arae- yet. `z= 5103 <br /> Yy� <br /> Rff ww�I`a,un• <br /> September 13, 1991. <br /> Unocal Station No. 6981, Stockton. California <br /> Resna has perforn-,!d quarterly monitoring at the site since October 1990, however, <br /> end tin <br /> water has riot been present in tite wells since October 1990(Applied GeoSystems,p g) <br /> Analytical results of water samples collected from the five monitoring wells in February 1990 <br /> lied Geos sterns. <br /> indicated dissolved hydrocarbons were present in the ground water (App y <br /> 1991). Evaluation of the ground water gradient in February 1990 indicated �s shown ient f <br /> 0.005 to 0.0063 and a direction of ground water flow towards tit <br /> Plate 2 (Applied GeoSystems, 1991). <br /> ree <br /> onal <br /> On the basis of the results of these investigatir^s,we recommended d near drilling <br /> Cehter of the east <br /> borings near the northeast and northwest corners of the <br /> boundary of the site to further evaluate the lateral extent of hydrocarbons in the soil. In <br /> addition,we recommended that vapor-extraction wells be installed in the borings to evaluate <br /> the feasibility of using vapor extraction to remediate tite soil. However,at Unocal's requV. i <br /> ' we have modified the previously proposed work to install three deeper monitoring wells to <br /> te tile <br /> evaluate the ground water and the ground water gradient beneath <br /> ifeasibility of usingavapor- <br /> latera! extent of hydrocarbons in the soil, and to evaluate <br /> extraction as a soil remediation alternative. <br /> PROXIMITY OF WELLS AND UTILITIES <br /> According to records obtained from the California Nater Service and the Stockton <br /> Municipal Utilities District there is only one municipal water-suppiy well within 2 000 feet <br /> of the site. This well is at the corner of Bidwell Place and Bianchi Road, approximately <br /> 1,800 feet southeast of the site, and is shown on Plate 1. The well is maintained by the <br /> California Water Service. <br /> e� <br /> 4 <br /> ✓ 18032-4W <br />