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1 iiilsia8 1U:38 U510 f842 )8370 CHEVRON U.S.A. 0002/01T <br /> Ommn <br /> NO Chevron <br /> Chevron MS.A.Products Company <br /> November 15, 1996 6001 Bollinger Canyon Road <br /> Building L <br /> San Ramon,CA 94583 <br /> P.O-Box 5004 <br /> Ms.Mary Meays San Ramon,CA 94583-0804 <br /> San Joaquin County Environmental Health <br /> P.O.Box 388 Madiating-NorthwestRegion <br /> . <br /> Stockton, CA 95201-0388 Phone 510 842 9500 <br /> Re_ Former Chevron Station N 9-1918.45 East Harding Way,Stockton.CA <br /> Rationale supporting the proposed abandonment and replacement of 13 onsite wells <br /> Dear Ms.Meays: <br /> The following rationale for well abandonment and replacement is beingP rovided to support the workplan <br /> prepared by Gettler-Ryatt,Inc.,dated November 8, 1996.In providing this information,the following <br /> philosophy was used as guidance,as was,the most recent results from groundwater monitoring and <br /> sampling(attached). <br /> Guiding Philosophy: <br /> 1.Does the present well location conflict with proposed site development plans? <br /> 2.Is the groundwater contaminant plume adequately domed? <br /> 3. Can the stability of the groundwater contaminant plume be determinedlmonitored7 <br /> 4.How many wells can be abandoned within the specified time limit(i.e..before 11/23/96)? <br /> i <br /> Proposed Abandonment Rationale <br /> MW-1 located in proposed drive-thru/high traffic arca <br /> MW-2R Located beneath proposed building footprint <br /> WW-4 Located beneath proposed building footprint <br /> MW-5 Located in proposed drive-thnt/high traffic area <br /> MW-6 Located in proposed drive-thnt/high traffic arca <br /> MW-9 Confirmed ND;Use MW-I l instead <br /> MW-9 Located beneath proposed building footprint <br /> V-1 Located beneath proposed building footprint <br /> V-2 Located beneath proposed building footprint <br /> V-3 Located beneath proposed building footprint <br /> V-4 Unnecessary vadose well:potential vertical conduit <br /> V-5 Unnecessary vadose well;potential vertical conduit <br /> V.6 Unnecessary vadose well;potential vertical conduit. <br /> Proposed Replacement Rationale <br /> NTq-6R (see map) Continue ability to monitor changes in plume <br /> stability/migration <br />,1 <br /> i <br />