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Woodward-Clyde W <br /> Consultants <br /> Engineering a sciences applied to the earth&its environment - <br /> May 27, 1992 <br /> 90189N <br /> Anthony J. Landis J U N . . <br /> Chief Site Mitigation Unit <br /> ENVIRbN(VIEN ;i. l"I L< LTH <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 /> Woodward-Clyde Consultants (WCC) has completed the seventh 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 seventh 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 seventh quarter of the groundwater monitoring program. <br /> The groundwater samples for the seventh quarter were collected on April 29, 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 measure the depth from the top of the well casing <br /> to the groundwater surface. Each well was purged with a Teflon bailer until a minimum of three <br /> 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 groundwater was sampled from the wells. <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. An equipment/travel blank designated as MW-31 <br /> and a blind duplicate sample designated as MW-32 (duplicate sample for MW-6) were also <br /> submitted to a DHS-certified laboratory for analysis. Chain of custody documentation was <br /> r <br /> 0967 <br /> 10370 Old Placerville Rd..Suite 104 • Sacramento.CA 95827-2505 • (916)368-0988 • Fax:(916)368 <br />