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� I I I KEI-P88-1413 .R4 October 27 , 1994 Page 4 In late February of 1991 , a meeting was held at the office of the SJCPHS in Stockton, California . The purpose of the meeting was to discuss the past work that had been conducted at the subject site, and to develop a plan to continue the ground water investigation at and in the vicinity of the site. Attending the meeting were Ms. Diane Hinson of the SJCPHS and representatives of both Unocal and KEI . It was agreed in the meeting that the soil contamination at the site had been adequately addressed and remediated (as stated in a letter from the Regional Water Quality Control Board [RWQCB] , Central Valley Region, dated August 25 , 1989) . It was also agreed that Unocal would institute a phased approach in defining, evaluating, and then remediating (if necessary) the ground water contamination at the site. In Phase I of the approach, Unocal agreed to perform the following tasks: 1. Perform a survey of all existing monitoring wells at the subject site. Measure water levels and sample all wells which were not dry. 2 . Make necessary repairs to all ground water monitoring wells that could be salvaged. All vadose zone wells originally installed by Kleinfelder, and all monitoring wells found to be damaged beyond repair were to be properly destroyed after applicable permits were obtained. 3 . Conduct a detailed review of available records concerning other past and ongoing environmental investigations in the general area. This information would help determine the placement of additional monitoring wells ( if necessary) . 4 . Prepare a technical report summarizing the activities men- tioned above. KEI completed the tasks listed above. The results of KEI ' s site inspection and file review were as follows : 1. On May 18, 1991, a representative of KEI inspected the subject site to determine the condition of all monitoring wells. Wells RW1, MW2 , MW8 and off-site well MW6 were monitored and found to be dry The total depths of these wells ranged between 47 . 72 and 58 . 50 feet below ground surface. Wells MW2 and MW8 had suffered wellhead damage during the site excava- tion and were unsecured. Wells MW4 and MW5 appeared to be located beneath an office building recently constructed on the site. Well MW9 appeared to have been paved over during construction of a parking lot for the new office building. i