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1 � <br /> • Soil samples were collected at 5-foot Intervals to the terminal depth <br /> of the soil boring for potential laboratory analysis <br /> • Soil samples were selectively analyzed by a California State-certified <br /> laboratory (American Analytics of Chatsworth, California) for total <br /> petroleum hydrocarbons as gasoline (TPH), benzene, toluene, <br /> ethylbenzene, and total xylenes (BTEX) and methyl tertiary butyl <br /> ether (MTBE) using EPA Methods 8015M (modified for gasoline), <br /> and 8020, respectively Soil samples containing detectable <br /> concentrations of MTBE were further analyzed using EPA <br /> Method 8260 <br />' Groundwater elevations were calculated to assess the direction of <br /> subsurface groundwater flow and hydraulic gradient for the Site <br />' MW-12 is scheduled to be surveyed at a later date <br /> • Park conducted a 12-hour groundwater extraction test on monitoring <br />' well MW-11 using a 2-inch submersible Grundfos pump at a <br /> maximum sustainable flow rate of 4 gallons per minute (gpm) <br />' Groundwater elevations m groundwater wells MW-3, MW-4, MW-5, <br /> MW-7, and MW 10 were gauged every 3 0 minutes for six (6) hours, <br /> and once every hour thereafter, using water level indicators during <br /> groundwater extraction testing activities <br /> • A groundwater sample was collected from the extraction well <br /> (MW-11) i nmediately prior to and following extraction testing The <br /> groundwater sample was analyzed for TPIL BTEX, and MTBE using <br />' EPA Methods 8015M(modified for gasoline) and 8020, respectively <br /> Extracted groundwater was collected in an above-ground tank for <br /> classification and disposal Sun-Ag treated the extracted groundwater <br /> (approximately 2,800 gallons)using carbon and discharged the treated <br /> water to a storm drain under a special permit for wastewater discharge <br /> (P 106 984 116) A copy of the permit is included as Appendix E of <br /> this report <br />' Park personnel performed quarterly groundwater monitoring and <br /> sampling activities at the Site for the first quarter of 1999 Existing <br /> (MW-3, 4, 5, 7, and 10) and newly (MW-12) installed wells were <br />' gauged, purged, and sampled The groundwater samples were <br /> analyzed for TPH, BTEX, and MTBE using EPA Methods 8015M <br /> (modified for gasoline)and 8020, respectively Groundwater samples <br /> A 11528JI ASA 2 <br />