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Ms Mary Meays Page 5 July 14, 1991 • MW-2A showed low concentrations of TPH-G, TPH-D, and petroleum compounds No free product was observed at MW-2A during this quarter This is in contrast to the previous analysis when free product (<0 01 inches) was observed in the groundwater from this well and no sample was obtained and analyzed MW-3A and MW-4A showed no detectable quantities of gasoline, diesel, and petroleum compounds The absence of these compounds in MW-4A is consistent with the results from previous investigations. Previously, MW- 3A had very low levels of BTEX compounds. Thus, it is probable that MW- 3A is situated on the margin of the area affected by gasoline from the former UST EDB was not detected in any of the wells, nor had it been detected in previous quarters No organic lead was detected in any of the groundwater samples that were analyzed These results for organic lead are consistent with those of previous quarters Total lead was detected in the samples that were analyzed, but at levels below its Maximum Contaminant Level (MCL) in drinking water The data were obtained from unfiltered and HNO3-preserved groundwater samples . that had resided at the laboratory for 15 days before extraction and analysis It is highly probable that the results reflect lead from dissolved sediment in the unfiltered sample Subsequent monitoring activities will be conducted on filtered water samples to minimae the effect of any dissolved sediment The information provided comprises the Second Quarterly 1992 Monitoring Report for the 1325 West Weber Avenue Former Tank #1 and #2 saes If you have any questions regarding this report, please contact either of the undersigned Sincerely, ERM-WEST, INC Bruce J Pfaff re Rubin, C P S S Project Manager Managing Associate C� BJP/bjp/1572 OI Enclosures - Noted cc Elizabeth Thayer — Central Valley Regional Water Quality Control Board