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� Chevron <br /> a,_� � Chevron <br /> Wo <br /> USEyq <br /> rie9+ YY <br /> 7 ;x0i 2 e, i 4S <br /> Chevron U.S.A.Products Company <br /> November 15, 1996 6001 Bollinger Canyon Road <br /> Building L <br /> San Ramon,CA 94583 <br /> P0.Box 5004 <br /> Ms.Mary Meays San Ramon,CA 94583-0804 <br /> San Joaquin County Environmental Health <br /> P.O.Box 388 Marketing-Northwest Region <br /> Stockton, CA 95201-0388 Phone 510 842 9500 <br /> Re: Former Chevron Station#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 being provided to support the workplan <br /> prepared by Gettler-Ryan,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 defined? <br /> 3. Can the stability of the groundwater contaminant plume be determined/monitored? <br /> 4. How many wells can be abandoned within the specified time limit(i.e.,before 11/23/96)? <br /> i Proposed Abandonment Rationale <br /> MW-1 Located in proposed drive-thru/lxigh traffic area <br /> MW-2R Located beneath proposed building footprint <br /> MW-4 Located beneath proposed building footprint <br /> MW-5 Located in proposed drive-thru/high traffic area <br /> MW-6 Located in proposed'drive-fluu/high traffic area <br /> MW-8 Confirmed ND;Use MW-11 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 /> MW-6R (see map) Continue ability to monitor changes in plume <br /> stability/migration <br />