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W - r <br /> �,N <br /> ►.n <br /> April 5,1991 <br /> Site Asse=lent Report Page 10 <br /> 139 South Centar,Stockton,CA <br /> SUBSURFACE CONDITIONS <br /> SOILS <br /> this investigation Con*tsted primarlly of <br /> The subsurface encountered durlr>g € <br /> w slits,silty c€ays,and:lean,well grad;)d fine gravelly sand lenses up to r <br /> irrterbedded clayey slits,sandy is a cross- <br /> 2-feet In thickn�m. The litholo$ies enc"tered are illustraon Figure 4, rs and below the sandy <br /> section of the soils which were e�uritsred. The water-bearing49-feet below <br /> silts and appears to be unconfined. Groundwater 11encountered <br /> ncoilected in the fieland <br /> om approximately <br /> ,.:. grade. The rasuhs of the laboratM analyses of so P �-3 and Mw-4,and from <br /> 1-to 2-feet above the first encountered groundwater'.n the borings for MW-2, <br /> 1-,�and 10-feet above the fust encx�uuntered groundwater in the boring for Mil-1,ell reported non- <br /> nds. Copies of the laboratory reports <br /> detectable concentrations of BT©i and TPH-as-gas°iine compou <br /> are presented in Appendix F. <br /> GROUNDWATER <br /> 1991 and February 19,1991), <br /> At th�s time 14-15, <br /> of monftoring well lnstailat <br /> atelon45-to 49-feet�1oW grade,and approximately 32-to ; <br /> groundwater was encountered at approximately approximately 44-to <br /> 37-feet below sea level. when tine groundwater was monitored,its'elevation was <br /> e unconfined conditions. The monitoring data collected on Mich 8, <br /> 46-feet below grade,suggesting tentiornetrie surface <br /> F = <br /> 1991,were combined with the surveyed wellhead elevation data to produce whose gradient is <br /> shows a southeast groundwater slope <br /> map presented as Figure S. <br /> The map ; <br /> approximately 0.002 foot per-foot(ft/ft). This is a relatively shallow gradient ' <br /> les obtained from tie <br /> I The resuhs at the laboratory analyses performed on the groundwater same <br /> ntratians of TPl+as-gasol€n2 In the water samples <br /> s"n sate on March 8, 1991,Indicsted msasurabie cone ppb, pectivety). este laboratory <br /> collected from mor►ttoring wells f/,w-1 sand MWi luded in Appendix D and summarized in Table 3. <br /> i.g manifests and Chain-of-Custody Manifests <br /> the TPH-as-gasoline concentration and benzene concertati <br /> Figure 8 Shows <br /> on for each well. <br /> f a miable groundwater <br /> pQpth to water n►easurernents made following development suggests ndwater before and after <br /> urements of depth -g <br /> gradient direction. See Appendix F for meas <br /> E^�1 <br /> well development. <br /> GROUNDWATER <br /> !TECHNOLOGY,INC. <br /> 1 . <br /> i <br /> l� <br /> T <br />