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Quarterly Monitoring Report January 1999 <br /> Canepa s Car Wash(Pacific Avenue) <br /> February 8, 1999 <br /> Page -3 <br /> approximately one and ogle-half foot since the previous monitoring event conducted in October 1998 <br /> l he groundwater elevation ranged from 20 63 to 21 67 feet below mean sea level (bmsl) The <br /> groundwater elevation contour snap (Figure 3, Appendix A) indicates groundwater mounding in the <br /> tenter of the site in the vicinity of MW-1 and MW-2 See Table 1, below, for groundwater elevation <br /> data A hydrograph of groundwater elevations is included as Figure 4, Appendix A <br /> TABLE 1 <br /> GROUNDWATER ELEVATION DATA (JANUARY 21, 1999) <br /> MW-1 THROUGH MW-8 <br /> I Well Well Casing Well Collar Depth to Groundwater <br /> ID Screen Elevation Water Elevation <br /> Interval (feet) (feet) (feet) <br /> (feet- bgs) <br /> MW-1 50- 70 13 45 3423 -2078 <br /> MW-2 50- 70 13 27 33 90 -2063 <br /> MW-3 50 -70 13 50 3464 -21 14 <br /> MW-4 50 - 70 13 82 3482 -21 00 <br /> MW-5 50- 70 1269 33 89 -21 20 <br /> MW-6 45 -65 1162 3329 -21 67 <br /> MW-7 45 -65 13 18 34 31 -21 13 <br /> 45 -65 13 26 3422 -2096 <br /> I <br /> 4 2 LABORATORY ANALYSES (TPH-G,13TEX,OXYGENATES/ADDITIVES) <br />' The groundwater samples were analyzed by GeoAnalytical Laboratories, Inc for total petroleum <br /> hydrocarbons - quantified as gasoline (TPH-G) by Method 5030/LUFT, for benzene, toluene, ethyl <br /> benzene, and total xylenes (BTEX) by EPA Method 602, and for selected gasoline oxygenates/additives <br /> by EPA Method 826V 1 he gasolnle 0xyget1dtCS/dUU1L1VCh 11HAUUC 111UL11y1 Lel Udly-bUtyl elllel (1V1 T BE), <br /> ethanol, tertiary-butanol, di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), and tertiary-amyl <br />' methyl ether (I AME) <br /> Laboratory analyse-, indicated that the selected gasoline oxygenates/additives excluding MTBE were <br /> not detected, at or above the laboratory reported detection limits in any of the groundwater samples <br /> M1 BE was detected in the groundwater samples collected from monitor wells MW-1 MW-2, and MW-3 <br /> at concentrations of 300, 94, and 10 micrograms per liter (µg/l), respectively B1 EX constituents were <br /> not detected at or above laboratory reported detection limits in the groundwater samples collected trom <br />' monitol wells MW-3, MW-5, MW-6, MW-7, and MW-8 BTEX constituents were detected to <br /> groundwatei samples collected from MW-1 and MW-2 at concentrations ranging from 222 to 3 , <br />' �� CONDOR <br />