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i <br /> . ' 24 January 1997 <br /> h <br /> AGE-NC Project No 97-0288 <br /> _ <br /> Page 4of5 t , <br /> • TPH-d was detected in one soil sample collected near the west end of the 12,000-gallon <br /> diesel UST at a concentration of 1,000 ppm The extent of impacted soil near this boring is <br /> likely to be limited <br />' • Petroleum hydrocarbons were detected in grab ground water samples collected near both <br /> UST areas Further assessment of impacted ground water at the site is warranted <br /> • According to representatives of Castle Analytical,compounds detected in the gasoline-range <br /> in the water sample collected near the western UST cluster do not appear to be gasoline The <br /> detected compounds may be lighter'diesel compounds detected within the reporting range <br /> Lfor gasoline <br /> • Maximum contaminant levels (MCLS) and action levels (ALs) far diesel have not been <br /> established for drinking water by the U S EPA or State of California Department of Health <br /> Services Concentrations of xylenes detected in grab water samples are below the MCL of <br /> 1750 ppb <br /> • Petroleum hydrocarbons were not detected in the soil sample collected near the septic system <br /> leach lines Operation of the septic system does not appear to have negatively impacted the <br /> I • subject property with petroleum hydrocarbons <br /> 52 RECOMMENDATIONS <br /> Based upon data collected from the site,AGE has the following recommendations for consideration <br /> • Impacted soil encountered near the USTs should be excavated during UST,removal <br /> • Following removal of the USTs, monitoring wells should be installed to determine the actual <br />' ground water flow direction acrd to detennrne the lateral extent of impacted ground water at <br /> the site <br /> A well'survey should be performed to identify potential ground water receptors in the general <br /> area of the site , <br />' No further investigation of the septic system area is warranted at this time <br /> a <br /> y <br />' r 6.0. LIMITATIONS <br /> t <br /> Ile! <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in this or similar localities The findings were based mainly <br /> on analytical results provided by. an independent laboratory Evaluations of the <br /> ! <br /> I ! ° <br /> > ' c <br />