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10370 Old Placerville Rd. <br /> Suite 104 Woodwaf-Clyde Consultants <br /> Sacramento.CA 95827-2505 <br /> (916)368-0988 <br /> Fax:(916)368-0967 <br /> March 6, 1991 <br /> 90189N <br /> _ �zw <br /> r. 2 <br /> Anthon J. Landis Ei�Jr : �' nr-� �'�'. UJ EA <br /> y PEiLTii <br /> Chief Site Mitigation Unit <br /> Department of Health Services (DHS) <br /> Toxic Substances Control Division <br /> Northern California Section <br /> 10151 Croydon Way <br /> Sacramento, CA 95827 <br /> Subject: Docket No. HSA 89/90-018 <br /> Post Closure Groundwater Monitoring Program <br /> LIKA Corporation Former Facility, Navy Drive Site <br /> Stockton, California <br /> Dear Mr. Landis: <br /> Pursuant to the above referenced agreement, Woodward-Clyde Consultants(WCC)has completed <br /> the second quarter of the post closure groundwater monitoring program at the above facility on <br /> behalf of Lika Corporation. The post closure groundwater monitoring program was specified <br /> in the DHS Certification Approval for Remedial/Removal Action dated June 29, 1990. WCC <br /> has collected the second quarter groundwater samples in accordance with the post closure <br /> groundwater monitoring program. This letter presents the sampling activities and the analytical <br /> results of the samples collected during the second quarter of the groundwater monitoring <br /> program. <br /> The groundwater samples for the second quarter were collected on February 1, 1991 from the <br /> seven monitoring wells (MW-1, MW-2, MW-4, NiW-6, MW-14, MW-15, and MW-30) on this <br /> site. The sampled wells were first sounded to determine the depth from the top of the well <br /> casing to the groundwater surface. Each well except MW-14 was purged until a minimum of <br /> three well casing volumes of groundwater was extracted. Only one well casing volume of <br /> groundwater could be purged from monitoring well MW-14 before the well was bailed dry. The <br /> recovery rate for monitoring well MW-14 was observed to be very slow. During the purging <br /> of the wells, groundwater samples were measured in the field for pH, temperature and specific <br /> conductance at approximately every well casing volume. After the wells were purged, the wells <br /> were allowed to recover for approximately two hours before the wells were sampled. The <br /> groundwater samples collected for dissolved metals (copper and lead) were field filtered through <br /> a pump with an in-line 0.45 µm filter. <br /> Consulting Engineers.Geologists <br /> gnd Environmental Scientists `- <br /> Offices;n Other Princ:oal Cities _ <br />