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KEI-P89-1104 .QR4 February 3 , 1992 Page 7 Selected soil and all water samples were analyzed by Sequoia Analytical Laboratory in Concord, California, for TPH as gasoline and BTX&E. In addition, the samples collected from MW1 (adjacent to the waste oil tank pit) were analyzed for TPH as diesel, total oil and grease (TOG) , and EPA method 8010 constituents. Analytical results of soil samples collected from the borings for monitoring wells MW1 through MW4 indicated non-detectable levels of TPH as gasoline and benzene in all soil samples, except for sample MW3 at 30. 5 feet, which showed 0. 088 ppm benzene. In MW1, TPH as diesel, TOG, and all EPA method 8010 compounds were non-detectable in all samples, except for sample MW1 at 10 feet, which showed 76 ppm of TOG. Analytical results of the ground water samples collected from monitoring wells MW1, MW2, and MW4 indicated non-detectable levels of TPH as gasoline and BTX&E. In well MW3, TPH as gasoline and benzene were detected at levels of 220 ppb and 7 . 6 ppb, respec- tively. In well MW1, TPH as diesel was detected at a level of 170 ppb, TOG was non-detectable, and all EPA method 8010 constituents were non-detectable, except for chlorobenzene and 1, 2-dichloro- benzene at concentrations of 2. 3 ppb and 7 .4 ppb, respectively. Results of the soil analyses are summarized in Table 3 , and results of the water analyses are summarized in Table 2. Based on the analytical results, KEI recommended the implementation of a monthly monitoring and quarterly sampling program for all of the monitoring wells. Documentation of well installation protocol, sample collection techniques, and sample results are presented in KEI 's report (KEI-P89-1104 .R7) dated December 10, 1990. RECENT FIELD ACTIVITIES The four wells (MW1, MW2 , MW3 , and MW4) were monitored three times and sampled once during the quarter. During monitoring, the wells were checked for depth to water and the presence of free product. On the sampling date the wells were checked for the presence of sheen. No free product or sheen was noted in any of the wells during the quarter. Monitoring data are summarized in Table 1. Water samples were collected from the wells on December 30, 1991. Prior to sampling, the wells were each purged of between 8 and 12 gallons by the use of a surface pump. Samples were then collected by the use of a clean Teflon bailer. Samples were decanted into clean VOA vials and/or one-liter amber bottles, as appropriate, which were then sealed with Teflon-lined screw caps and stored in a cooler, on ice, until delivery to the State certified laboratory.