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10370 Old Placerville Rd. <br /> Suite 104 <br /> WoodwAS-Clyde Consultants <br /> Sacramento,CA 95827-2505 <br /> (916)368-0988 <br /> Fax:(916)368-0967 <br /> June 3, 1991 <br /> 90189N 1914 <br /> R E <br /> Anthony J. Landis J U N 10 1991 <br /> Chief Site Mitigation Unit ENVIRONMENTAL HEALTH <br /> Department of Health Services (DHS) PERMIT/SERVICES <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 /> Woodward-Clyde Consultants (WCC) has completed the third quarter of the post closure <br /> groundwater monitoring program at the above facility on behalf of Lika Corporation. The post <br /> closure groundwater monitoring program was specified in the DHS Certification Approval for <br /> Remedial/Removal Action dated June 29, 1990. WCC has collected the third quarter <br /> groundwater samples in accordance with the post closure groundwater monitoring program. This <br /> letter presents the sampling activities and the analytical results of the samples collected during <br /> the third quarter of the groundwater monitoring program. <br /> The groundwater samples for the third quarter were collected on May 1, 1991 from the seven <br /> monitoring wells (MW-1, MW-2, MW-4, MW-6, MW-14, MW-15, and MW-30) on this site. <br /> The sampled wells were first sounded to determine the depth from the top of the well casing to <br /> the groundwater surface. Each well was purged until a minimum of three well casing volumes <br /> of groundwater was extracted. During the purging of the wells, groundwater samples were <br /> measured in the field for pH, temperature and specific conductance at approximately every well <br /> casing volume. After the wells were purged, the wells were allowed to recover for <br /> approximately two hours before the wells were sampled. The groundwater samples collected for <br /> dissolved metals (copper and lead) were field filtered through a pump with an in-line 0.45 µm <br /> filter. <br /> A travel blank designated as MW-31 and a blind duplicate sample designated as MW-32 <br /> (duplicate sample for MW-6) were also submitted to a DHS-certified laboratory for analysis. <br /> Consulting Engineers.Geologists <br /> and Environmental Scientists `A <br /> Officesn Other Principal Cities _ <br />