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1 ' Quarterly Monitoring Report April 1999 Canepa s Car V'ash(Part.Street) Ma,, 31, 1999 Page 4 in these samples A summary of the laboratory analytical results Is prc,sented below In Table 2 and in Figure 2, Appendix A Laboratory report sheets Indicating analytical methods used, detection limits, and the results of ' the analyses are included in Appendix C Historical groundwater analyses are presented in Table A, Appendix B ' TABLE 2 LABORATORY ANALYTICAL RESULTS (APRIL 1999) ' Other B T E X MTBE Oxygenates/ TPH-G Additives ' MONITOR Detection 0 3 03 03 06 10 1 0- 10 005 WELL/ DATE Limits µg/l µg/1 µg11 µg/l µg/l }xg/3 tngll SAMPLE Sample I D ' MW-1 4/23199 2038-MW1-4/2"1/99 ND 03 ND ND 12 ND 006 MW-2 4/23/99 2038-MW2-4/23!99 200 130 280 390 ND* ND* 13 ' MW-3 4/22/99 2038-MW3-4/22/99 ND 26 05 ND 49 ND 0 1 MW-4 4/22/99 2038-MW4-4122/99 ND ND ND ND ND ND ND MW-5 4122199 2038-A4W 5-4/22199 1 900 3,200 660 1 600 ND* 6 3 -DIPE 19 MW-6 4122199 2038-MW6-4/22199 ND 06 ND ND 12 ND ND MW-7 4/23/99 2038-MW7-4/23/99 03 14 ND ND ND ND 008 ilnrt Conversions Analvtical pgll parts per billion(ppb) B"I E,a=bcnzcue toluene,etht I benzene and total xylenes ' m_Wl parts per nulhon(ppnt) TPH-G=total petroleum h)drocarbons quantified as gasoline MTBE=Meth}1 tertiary But31 Ether Other Oxygenates/Addim es=ethanol Di-isopropy l ether(DIPS),Ethyl tertiary-Butyl Ether (ETBE) tertiary-amN I Meth 1 Ether(FAME) and tertiary-Butanol ' ND=none detected at or aboNe reported laboratory detection limit ND* = not detected at or above a rarscd laboratory reported detection limit See laboratory report sheets for detection Inuits 5. DISCUSSION OF RESULTS ' Since September, 1994, the depth to groundwater at the site has generally decreased from approximately 46 to 23 feet bgs The average depth to groundwater measured during the April 1999, groundwater monitoring event was approximately 23 feet below the monitor well measuring points The groundwater elevation ranged from ' 10 96 to 12 63 feet bmsl The groundwater elevation contour map (Figure 3, Appendix A) indicates that the groundAater gradient at the site is genei ally towards the northeast This is consistent with previous monitoring results A hydrograph of monitor wells MW-1 through MW-7 (Figure 4, Appendix A) illustrates the fluctuation of the groundwater table Historical groundwater measurements are provided in the accompanying Hydrograph Table(Appendix A) I he laboi atony analytical results for the Alpril 1999, groundwater monitoring event are generally consistent NN ith the laboratory anal}ticdl results for the lanuar} 1999, groundwater monitoring event None of the a es of I 4r% CONDOR