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' Bank of Stockton - Cutter Lumber Site Page 6 <br /> Quarterly Groundwater Monitoring Report <br /> Project No 102 2 <br /> October 29,2003 <br />' 3.0 DISCUSSION <br />' 3.1 Discussion of Data <br />' Field and analytical data results are summarized in Tables 1 and 2 and <br /> illustrated in Figures 3 through 5 <br />' The depth to water data collected during the last monitoring event in June were <br /> somewhat abnormal due to the pilot test of vapor extraction and air sparging <br /> that was occurring at the time In this event, the groundwater gradient has <br />' returned to normal The contour map of the groundwater surface (Figure 3) <br /> suggests that the flow of groundwater is to the northeast, and appears generally <br /> consistent with historical norms Over the past quarter the groundwater <br />' elevation has fallen over three feet, which represents a greater than typical <br /> change The level of groundwater is now lower than at any time since 1995 <br /> Cl%_Uo ntd111111di1 L 1CVC1� Ivullu lli grViilluwGLl+CJ1 .ry7a111p1G.n were gelieraliy i,Vii si7 t,c ii lr <br /> with past sampling events except in the case of the peripheral or down-gradient <br /> wells The sample from MW-9 contained 478 ppb of TPH-G, higher than at any <br /> time since the summer of 1999 The sample from MW-10 contained 58 ppb of <br /> TPH-G, which is the first time gasoline, has been detected in this well since it <br />' was initially sampled in the spring of 1998 when 51 ppb were detected The <br /> MW-11 sample did not contain TPH, but benzene and xylene were found at <br /> concentrations lust above detection limits The well has not produced detectable <br />' BTEX constituents since March of 2000 It is likely these results are transient, <br /> possibly due to the rather sudden change in groundwater elevation <br />' 3.2 Future Work Schedule <br /> Quarterly groundwater monitoring and sampling should continue The San <br />' Joaquin County EHD has directed that a Corrective Action Plan (CAP) should be <br /> submitted based on a report was dated August 1, 2003 and entitled Report, <br /> Romedlal Action Pilot Test and Feaslbillty Study The CAP should be completed <br />' in the near future <br /> i <br /> i2937 Veneman Ave ,#13240 Geo-Phase Environmental Inc Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209) 569-0293 <br /> 1 <br />