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' 2. Determine the vertical and horizontal extent of HE compounds in the HE <br /> Process Area. <br /> ' 3. Determine the aquifer characteristics of the water-bearing zones containing <br /> HE. <br /> ' Procedure <br /> To complete the remedial investigation of the HE process area, LLNL intends to <br /> ' install at least three additional monitoring wells to define the limits of RDX in ground <br /> water. In addition, two monitoring wells installed as part of the remedial investigation <br /> of the B815/GSA TCE study will be used in the HE investigation. The new wells will be <br /> constructed, developed, and hydraulically tested as described previously. Ground water <br /> ' will be sampled quarterly and analyzed for HE compounds. <br /> TASK 11 - REMEDIAL ACTION AT THE HIGH EXPLOSIVES PROCESS AREA <br /> ' If needed, remedial action at the High Explosives Process Area will begin in <br /> February 1990. A work plan will be prepared at that time. <br /> tTASK 12 - POST COMPLIANCE MONITORING AT PIT 6 <br /> Purpose and Rationale <br /> ' Between 1964 and 1973, Pit 6 received containerized waste materials which were <br /> generated at the Lawrence Livermore National Laboratory and the Lawrence Berkeley <br /> ' National Laboratory. Following cessation of waste disposal activities at Pit 6 in 1973' <br /> the pit was filled and the site covered by relatively impermeable soil. The site is <br /> presently used as a firearms training and practice range. Hydrogeologic investigations of <br /> ' the Pit 6 area were conducted in 1982, 1984, and 1987. Ground water quality in the <br /> shallow aquifer beneath the pit has not been adversely affected by the former disposal <br /> operations. LLNL plans to conduct routine ground water sampling and analysis from the <br /> wells of the Pit 6 monitoring system. <br /> Procedure <br /> ' To implement Post Compliance Monitoring of Pit 6, LLNL will install two <br /> additional ground water monitoring wells as recommended by Brown and Caldwell in their <br /> 1989 Hydrogeologic Investigation report. A series of wells will be selected to comprise <br /> ' the monitoring system at the pit, and the wells will be sampled and analyzed on a <br /> quarterly basis. <br /> TASK 13 - REMEDIAL INVESTIGATION AT PIT 8 <br /> ' Purpose and Rationale <br /> ' The purpose of this task is to complete the remedial investigation of the inactive <br /> Pit 8 area. Three monitoring wells (K8-1, K8-2, and K8-3) monitor ground water quality <br /> upgradient and crossgradient of this inactive pit. During 1987, up to 5 ppb of TCE have <br /> ' been detected in well K8-1. By July, 1988, LLNL plans to: <br /> -9- <br />