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I <br /> Corrective Action Plan <br /> Montgomery Ward Auto Service Center, Stockton, CA <br /> During the installation of these probes and wells, EAI also collected and tested selected soil <br /> samples (see Table 10) Data from this investigation are included in the estimated extent <br /> of soil contamination shown on Figure 4 Soil vapor analytical results for samples <br /> obtained from wells and probes during the pilot study are provided in Tables 11 and 12 <br /> Geology <br /> I The geology at the Montgomery Ward Site consists of alternating sand, silt and clay layers <br /> A silt layer extends from the surface to about 30 feet bgs The silt layer is underlain by a <br /> layer of sand, silt and clay layer that appears to be locally pinching This layer extends <br /> from approximately 30 to 50 feet bgs A coarse sand zone extends downward from <br /> approximately 50 feet bgs and forms the first water bearing zone <br /> Hydrogeology <br /> Ground water beneath the Montgomery Ward Site has been monitored since March 1993 <br /> The depth to ground water beneath the Montgomery Ward Site has varied from a low of <br /> I approximately 60 bgs in March 1993 to a high of approximately 36 feet bgs in March <br /> 1998, i e , a fluctuation of over 23 feet (see Table 13) The natural ground water flow <br /> direction beneath the Montgomery Ward Site is easterly (see Figure 8) However, at <br /> certain tunes of the year the flow direction is southwesterly (see Figure 7) The following <br /> summarizes the ground water flow direction between March 1993 and March 1998 <br /> MONTHWEAR QUARTER FLOW DIRECTION <br /> Mar 1993 First East-Southeasterly <br /> Jun 1993 Second South-Southwesterly <br /> Sep 1993 Third South-Southwesterly <br /> Dec 1993 Fourth East-Southeasterly <br /> Mar 1994 First Easterly <br /> Jun 1994 Second Southerly <br /> Sep 1994 Third Southerly <br /> Dec 1994 Fourth Southeasterly <br /> IFeb 1995 First East-Southeasterly <br /> Jun 1995 Second West-Southwesterly <br /> Sep 1995 Third West-Southwesterly <br /> Dec 1995 Fourth Easterly <br /> i <br /> Mar 1996 First Easterly <br /> I Jun 1996 Second Southwesterly <br /> Sep 1996 T hard Southvaesterly <br /> Dec 1996 Fourth Undetermined <br /> Mar 1997 First Northeasterly <br /> Jun 1997 Second Southwesterly <br /> Sep 1997 T-hird Soutlrwesteily <br /> Dec 1997 Fourth Easterly <br /> Mar 1998 First Easterly <br /> Protect No 1232 - 3 - <br /> SAB WORD 1232CAP <br />