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8820101-R COT-6 • 500 mg/kg were also analyzed for the volatiles benzene, toluene, ethyl benzene and xylene (BTEX) , total lead and ethylene dibromide (EDB) . All water samples were analyzed for TPH, BTEX, lead and EDB. The methods used in the various analyses are given on the laboratory reports provided in Appendix A. The results of these analyses are summarized in Table 1, while copies of the chain-of-custody forms are also provided in Appendix A. Well Monitoring and Elevation Survey Following installation of all wells, the relative elevation of each well was surveyed in by Woodward-Clyde personnel . Because the elevations are only being used to estimate the local groundwater gradient direction, relative instead of actual elevations were measured. Elevations were calculated by setting up the transit at a central location and assuming the elevation of the instrument was 100 feet. Using a surveyor' s rod, the vertical distances from the instrument to the top of casing were then P81 subtracted from the 100 feet to give the relative elevations of the well casings. On September 21, 1988, a return visit was made to the site to measure depth to water and monitor for presence of free product. An electronic well sounder was used to measure depth to water while a clear acrylic bailer was used to monitor for free product. No free product was noted in any of the wells, although there was a hydrocarbon odor in wells MW-1 and MW-2. As mentioned above, Well MW--3 was found to contain only a few inches of water. The casing elevations and water level measurements are given in Table 2. FINDINGS AND DISCUSSION The following is a discussion of the laboratory results and our findings and activities conducted during this investigation. The discussion includes a synthesis and explanation of data collected to date on the local