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Environmental Resources Management 1777 Botelho Drive APR 3 0 2004. suite 260 Walnut Creek,CA 94596 ENVIRONMENT HEALTH (925)946-0455 PERMIT/SERVICES (925)946-9968(fax) 27 April 2004 Mr. Harlan Knoll San Joaquin County Public Health Services Environmental Health Division - 304 East Weber Street Stockton, California 95202 i ERMO Subject: Well Abandonment Summary ' Former UPRR Property 936 East Weber Avenue Stockton,California i E Dear Mr. Knoll: o � a On behalf of Union Pacific Railroad Company (UPRR), ERM,West, Inc. _ (ERM) is pleased to submit this Well Abandonment Summary for the subject site. On 11 August 2003 the Central Valley Region of the California f Regional Water Quality Control Board (RWQCB) sent aI letterk to the San Joaquin County Environmental Health Department (SJCEHD;) in which the RW CB concurred that n '' Q o further action is required q red at the former UPRR property at 936 East Weber Avenue, Stockton, California (Figure 1). In accordance with this letter, the final action to be completed a�)the site was abandonment of the three monitoring wells. A Well Abandonment Workplan, dated 19 April 2004, and well permit ` application were prepared and submitted to your officeThe permit was approved on 22 April 2004 and issued the service request number SR# 0037729. On 27 April 2004 the three monitoring wells (MW-1 through MW-3) shown on Figure 2 were abandoned via pressure grouting, according to the following procedures: f • Wells were tagged for depth to ground water and total depth. All three wells had ground water at approximately 39 feet below ground surface and were free of obstruction to within 1.5 feet of actual construction depth. ; E • Grout consisting of neat cement (no bentonite added} was pumped into the casing through a tremie pipe extending to within 2 feet of the r bottom of the casing. Once the well was full of neat cement and the f