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Woodward-CAe W <br />y <br />Consultants <br />Engineering & sciences applied to the earth & its environment <br />February 7, 1992 <br />90189N <br />Anthony J. Landis <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 />FES 13 1952 <br />EhJVPRCJNllrr- " <br />Subject: Docket No. HSA 89190-018 <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 um 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 />10370 Old Placerville Rd., Suite 104 • Sacramento, CA 95827-2505 • (916) 368-0988 • Fax: (916) 368-0967 <br />