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Mr Bob Fratto <br /> December 21, 1995 <br /> Page 2 <br /> 4 05 feet from the second to third quarter, however, water levels changed very little (an average <br /> of 0 12 feet) from third to fourth quarter Water-level data are shown in Table 1 Historical <br /> groundwater flow directions and gradients are shown in Table 2 <br /> Analytical results of the groundwater samples for this and previous quarters are summarized in <br /> Table 3 The November 16, 1995 analytical results are shown on Figure I Laboratory reports <br /> are included as Exhibit A Analytical results did not identify any BTEX, TPH-G, TPH-D, or <br /> TPH-MO compounds in any of the groundwater samples <br /> Discussion <br /> The change in the gradient and the increased water levels over the past three quarters is likely <br /> due to the very wet winter and spring of 1995 The small change in water levels from third to <br /> fourth quarter is probably reflecting a much slower recharge of water into the aquifer system due <br /> to the dryer summer months <br /> Analytical results indicate concentrations of BTEX, TPH-G, TPH-D, and TPH-MO are below <br /> detectable levels this quarter Concentrations of TPH-MO in MW-1 decreased from 340 <br /> micrograms per Iiter (WL) on August 31, 1995 to less than the measurable reporting limit of <br /> 100 gg/L on November 16, 1995 Plasticizers or polymeric resins were noted by the analytical <br /> laboratory as a false positive within the pattern of the motor oil range for the August 31, 1995 <br /> sample This may confirm that the third quarter's result was erroneous due to a false positive <br /> BTEX, TPH-G, and TPH-D concentrations were not identified above measurable reporting <br /> limits for the second consecutive quarter <br /> If you have any questions regarding this report,please contact me at(916) 444-0123 <br /> Sincerely, <br /> BROWN AND CALDWELL <br /> ,r <br /> Pat G Cullen, R G #4932 <br /> Project Manager <br /> TMB ksc <br /> Enclosures <br /> cc Mr Steve Sasson, San Joaquin County Envirorimental Health Department <br /> Use or disclosure of data continued on this sheet is subject to the restriction specified at the beginning of this <br /> document <br /> 1427%REPORTS"95QTR RF"TH95QTR DOC <br />