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Mr Harlin Knoll Environmental Resources Page4 1998 Management Pa4 • 1,2,5-Trimethylbenzene ' Samples from four wells (MW-4, MW-5, MW-1A, and MW-2A) were also analyzed for heterotrophic plate counts The water quality and plate ' count results were analyzed for comparison to the baseline conditions established during the third quarter 1996 monitoring event, they will not be included during every future monitoring event ' The analyses were performed by following the flllaboratories ' • Quanterra, Inc (Sacramento, California) - TPH(g), TPH(d), BTEX, nitrate, chloride, pH, conductivity, manganese, ' 1,2,5-Trimethylbenzene, and 1,2,4-Trimethylbenzene, • Aquatic Biological Sciences (South Burlington, Vermont) - plate ' counts, • Quanterra (City of Industry, California) - dissolved methane and dissolved CO2, and • CLS Labs (Rancho Cordova, California) - ferrous and ferric iron ' Laboratory data sheets and chain-of-custody forms for this sampling event are included in Attachment B ' TPH as gasoline and BTEX detections in ground water samples collected from Former Tank Sites #1 and #2 are provided in Tables 1 and 2, ' respectively General water quality parameter measurements are presented in Tables 3 and 4 for the Former Tank Sites #1 and #2, respectively These results are summarized below for each site ' Former Tank Site #1 ' TPH and BTEX Results. TPH and BTEX detections in ground water samples collected from the Former Tank Site #1 during the December 1997 monitoring event are comparable to those associated with historical ' sampling events TPH(g) was only detected in the MW-5 sample, this detection (0 19 mg/1) represents the lowest detection recorded for samples historically collected from this well during the quarterly monitoring program (Table 1) TPH(d) was not detected in any of the ,. three wells sampled during this event BTEX compounds were generally not detected during this monitoring event The one exception, benzene,