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CALIFORNIA REGIONAL WATER QUAL)7Y CON i RCL :Dani, 3 CENTRAL VALLEY REGION '2443 Routier Road. Suite A _ho=: t916) 255_3-000 Sacramento, CA 95827-3098 r�T ti_.: 3" =000 TO: Wendy L. Cohen �NU FROM: Camilla Williams Senior WRC Engineer Engineering Geologist Antonia K. J. Vorster Senior WRC Engineer DATE: 20 August 1993 SIGNATURE: SiJtf.JtCl: WORK PLALY TO uGI.VLY/IYtIJJtVA LrtVLY1Ta?RIitTG 11`11=01f rMA CORPORATION, SAN JOAQUIN COUNTY This memorandum is prepared regarding the Work Plan to.Decommission Monitoring Wells at the Lika Corporation facilities in Stockton, dated 24 May 1993 and addresses the Navy Drive site which appears to have had some ground water impacts (copper, lead and total dissolved solids (TDS)) from waste disposal activities at this site. I am unfamiliar with the history of these sites, but have prepared this memorandum to document my findings based on my review of the monitoring data. I have recommended to San Joaquin County that it does not issue permits to abandon all of the wells but that some of the wells should be left in-place in the event that more monitoring is needed in the future (fax transmittal on 24 June 1993). Attached are copies of data from reports and from information obtained from the Department of Toxic Substances Control (DTSC). The Project Manager at DTSC is Mr. Fernando Amador. The Project Manager for Woodward-Clyde, consultant for Lika, is Mr. Jay Kamine. The Final Remedial Action Plan (RAP) was prepared for the Navy Drive site in November 1988. The Final RAP and a two year post-closure ground water monitoring program was conducted. The following seven wells were selected for monitoring during the post-closure period: MW-1, MW-2, MW-4, MW-6, MW-14, MW-15 and MW-30. Specific conductance, TDS, dissolved copper and dissolved lead were the only parameters considered for monitoring during the post-closure monitoring period. The ground water flow direction has apparently shifted historically. Based on information from Mr. Kamine (telephone conversation on 23 June 1993), the flow direction was historically to the south, however, during the past two years (during the post-closure ground water monitoring program) the flow direction has been northerly. Mr. Kamine also indicated that the elevated concentrations of TDS in MW-4 and MW-30 were due to turbidity. I recommend that, at a minimum, the following monitor wells be kept operational (not abandoned) at the Lika, Navy Drive site for the following reasons: iMonitor Well Rationale MW-14, (MW-14D) This well has shown elevated dissolved concentrations of copper up to 0.55 milligrams per liter (mg/1) during the past two years. The