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r 50012th StreetWoodwal ti•Clyde Consultants Suite 100 Oakland,CA 94607-4014 (415)893-3600 i July 11 , 1990 RECEIVED 90189K JUL 2 4 1990 ENVIRONMENTAL HEALTH PERMIT/SERVICES Anthony J. Landis Chief Site Mitigation Unit 3 O Department of Health Services Toxic Substances Control Division Northern California Section 4250 Power Inn Road Sacramento, CA 95826 Re: Docket HSA, Post Closure Groundwater Monitoring Program, Dated 29 April 1988, LIKA Corporation, Former Field Avenue Annex Dear Mr. Landis : Pursuant to the referenced agreement , Woodward-Clyde Consultants has completed the groundwater monitoring program. As specified in the agreement, groundwater samples were taken quarterly for two years from three monitoring wells designated as MW-1, MW-3, and MW-4. A travel blank designated MW-12 and a blind duplicate sample designated MW-13 were also submitted quarterly for analysis. All of the samples were analyzed at a Department of Health Services-certified laboratory for the following parameters: Conductivity, pH, Total Dissolved Solids, Total Copper, Total Nickel , Total Lead and Hexavalent Chromium. The three sampled wells were also sounded to determine groundwater elevation. The groundwater samples for the ninth and final quarter were collected on June 1, 1990 and taken to California Analytical Laboratories in West Sacramento. Appropriate chain of custody was maintained. A summary of the results is presented in Table 1, and a copy of the laboratory report is attached. A summary of the analytical results for the groundwater samples collected from the three monitoring wells (MW-1, MW-3 and MW-4) during the entire groundwater monitoring program are shown in Table 2. The analytical results (conductivity, pH, copper, lead, hexavalent chromium and nickel ) remained relatively consistent throughout the monitoring program. Consulting Engineers,Geologists Q and Environmental Scientists Offices in Other Principal Cities _