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Ms Mary Meays Page 4 October 14, 1991 MW-IA has the highest observed concentrations at Tank Site #2 may be attributed to the possibility that tidal fluctuations have spread these constituents from the UST northward However, no groundwater elevation data have been obtained to show a northern groundwater gradient at any time Further monitoring programs may provide more information about the gasoline and related petroleum constituents at MW-1A TPH-D (non-diesel mixture) measured in groundwater at MW-1A was lower than was previously observed in this well MW-2A showed diminished concentrations of TPH-G, TPH-D (non-diesel mixture), and petroleum compounds No free product was observed at MW- 2A during this quarter This is in contrast to the April 1992 monitoring when free product (<0 01 inches) was observed in the groundwater from this well and no sample was obtained and analyzed It is likely that the free product was associated with tank removal activities, and was removed during subsequent well purging 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 In the April 1992 monitoring, 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 UST The information provided comprises the Third Quarterly 1992 Monitoring Report for the 1325 West Weber Avenue Former Tank #1 and #2 sites If you have any questions regarding this report, please contact either of the undersigned Sincerely, ERM-WEST, INC Bruce J faff rey L in, C P S S Project Manager Managing Associate BJP/cln/1572 01 Enclosures - Noted cc Elizabeth Thayer -- Central Valley Regional Water Quality Control Board