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Woodward-ClIte W <br /> Consultants <br /> Engineering&sciences applied to the earth&its environment <br /> February 7, 1992 <br /> 90189N <br /> Fill' <br /> �ry7 <br /> Anthony J. Landis F E 8 13 1992 <br /> Chief Site Mitigation Unit ENV10Or M7-'NTAL r1lEA L tl,1 <br /> Department of Health Services (DHS) PERMI I <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 sixth 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 sixth 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 sixth quarter of the groundwater monitoring program. <br /> The groundwater samples for the sixth quarter were collected on January 15, 1992 from the <br /> seven monitoring wells (MW-1, MW-2, MW-4, MW-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 was purged with a Teflon bailer until a minimum <br /> of three well casing volumes of groundwater was extracted. During the purging of the wells, <br /> groundwater samples were measured in the field for pH, temperature and specific conductance <br /> at approximately every well casing volume. After the wells were purged, the wells were allowed <br /> to recover for approximately two hours before the wells were sampled. <br /> The groundwater samples collected for dissolved metals (copper and lead) were field filtered <br /> through a pump with an in-line 0.45 µm filter. <br /> A equipment/travel blank designated as MW-31 and a blind duplicate sample designated as <br /> MW-32 (duplicate sample for MW-6) were also submitted to a DHS-certified laboratory for <br /> jr'), <br /> JA 1 <br /> 10370 Old Placerville Rd.,Suite 104 • Sacramento.CA 95827-2505 - (916)368-0988 - Fax: (916)368-0967 <br />