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• <br /> KEI-P88--1013 .R4 <br /> October 27, 1994 <br /> Page 8 <br /> A joint monitoring event was conducted by MPDS Services, Inc. with <br /> the consultant for the nearby Montgomery Ward site on September 14 , <br /> 1994 . The monitoring data collected for the Montgomery Ward' s <br /> monitoring wells (provided by Environmental Audit, Inc. ) are <br /> summarized in Table 4 . <br /> RECENT FIELD ACTIVITIES - MONITORING WELL DESTRUCTION <br /> On July 14 , 1993 , off-site monitoring well MW6 was destroyed by <br /> pressure grouting the well casing with neat cement, which was <br /> placed from the bottom of the well to the surface using a tremie <br /> pipe plumbed by flexible hose to a group pump. The former well was <br /> destroyed (replaced by MW15) because it was dry and extended to a <br /> depth of only 48 feet below grade. <br /> ANALYTICAL RESULTS <br /> Selected soil samples collected from the boring of monitoring wells <br /> MW14 and MW15 were analyzed at Sequoia Analytical Laboratory in <br /> Concord, California. All samples analyzed were accompanied by <br /> properly executed Chain of Custody documentation. The samples were <br /> analyzed for TPH as gasoline by EPA method 5030/modified 8015, and <br /> BTEX by EPA method 8020 . The analytical results of the soil <br /> samples are summarized in Table 5 . Copies of the laboratory <br /> analyses and the Chain of Custody documentation for the soil <br /> samples are attached to this report. <br /> The analytical results of the ground water samples collected from <br /> all of the Unocal monitoring wells (MW10 through MW15) on September <br /> 14 , 1994 , are summarized in Table 3 . The concentrations of TPH as <br /> gasoline and benzene detected in ground water samples collected on <br /> September 14 , 1994 , are shown on the attached Figure 2 . Copies of <br /> the laboratory analyses and the Chain of Custody documentation for <br /> the water samples are attached to MPDS Services, Inc. Quarterly <br /> Data Report (MPDS-UN5098-04) dated October 18 , 1994 . <br /> HYDROLOGY AND GEOLOGY <br /> I <br /> On September 14 , 1994, the measured depth to ground water in the <br /> Unocal monitoring wells ranged from 56 . 69 to 57 . 77 feet below the <br /> top of the casings. The ground water flow direction at the Unocal <br /> and at the adjacent Montgomery Ward sites appeared to be to the <br /> south, as shown on the attached Figure 1. The hydraulic gradient <br /> at the site and vicinity on September 14 , 1994 , was approximately <br /> 0 . 008 , based on water level data collected from the Unocal <br /> monitoring wells prior to purging. <br /> ILI <br />