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10370 Old Placerville Rd. Woodwar�Cl de Consultants <br /> Suite 104 y <br /> Sacramento.CA 95827-2505 <br /> (916)368-0988 <br /> Fax:(916)368-0967 <br /> August 30, 1991 <br /> {v -erF.F• �7x� gr yNry..�_ 1 ipRy�, i; <br /> Anthony J. Landis SEP 4 99221 <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 fourth 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 fourth 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 fourth quarter of the groundwater monitoring program. <br /> The groundwater samples for the fourth quarter were collected on August 2, 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, except MW-14 and MW-15, was purged with a Teflon <br /> bailer until a minimum of three well casing volumes of groundwater was extracted. Only one <br /> and two and a half well casing volume(s) of groundwater could be purged from monitoring wells <br /> MW-14 and MW-15, respectively, before the wells were bailed dry. The recovery rate for MW- <br /> 14 and MW-15 was observed to be very slow. During the purging of the wells, groundwater <br /> samples were measured in the field for pH, temperature and specific conductance at <br /> 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. The groundwater <br /> samples collected for dissolved metals (copper and lead) were field filtered through a pump with <br /> an in-line 0.45 µm filter. <br /> Consulting Engineers,Geologists <br /> and Environmental Scientists AICA <br /> Offices in Other Principal Cities <br />