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a medium dark-brown, silty sand which was saturated A sandy clay was <br /> encountered at depth of twenty feet bgs Lithologic logs are included in <br /> 0 Appendix IV <br /> 5.2 Laboratory Analytical Results <br /> Groundwater samples were analyzed for Lead Scavengers (EDC and EDB), as <br /> well as Oxygenates by EPA method 8260, TPHg and TPHd by EPA Modified <br /> Method 8015 and for BTEX by EPA Method 8021 Detailed laboratory results, <br /> Quality Assurance/Quality Control (QA/QC) documentation and Chain of <br /> Custody records are presented in Appendix V <br /> 0 TABLE II <br /> ANALYTICAL RESULTS FOR GROUNDWATER SAMPLES <br /> SAMPLE: EPA METHOD 8260 EPA MODIFIED EPAMODIFIED EPA Method 8020 EPA <br /> NUMBER (ppb) METHOD 8015 WMOD 8015 BTEX METHOD <br /> INCLUDING MTBE DIESEL(ppm) GASOLINE(ppb) 8260 EDC <br /> Ethanol and AND EDB <br /> Methanol (ppb) <br /> 10 MW-1 240 ppb MTBE 120 ppb 410 ppb 3.1 ppb Benzene N D <br /> 16 TAME 0 51 pph Ethylbenzene <br /> 17 Tert-Butanol 11 0 ppb Xylene <br /> MW-2 1800 ppb MTBE N D N D N D N D <br /> 15 TAME <br /> 130 Tert-Butanol <br /> MW-3 16 ppb MTBE N D N D N D N D <br /> MW-4 3 8 ppb MTBE N D N D N D N D <br /> MW-5 ND ND ND ND ND <br /> MW-6 ND ND ND ND ND <br /> 1 <br /> Note N D - Not Detected at Method Detection Lim its <br /> N A - Not Analyzed <br /> Detection Limits EPA Method 8020 varies most are - 5 0 ppb <br /> EPA Method 8015 -0 5 mg/kg or 500 ppb <br /> Groundwater samples collected at the subject property showed elevated levels of MTBE in <br /> monitoring wells MW-1 and MW-2, 240 ppb and 1,800 ppb respectively These wells are <br /> located in the northwestern portion of the subject property MW-1 is located directly in the <br /> former tank pit excavation and MW-2 is located approximately 70 feet northeast of MW-1 <br /> Additionally, both wells had detections of Tert-amyl methyl ether (TAME) and Tert-Butanol <br /> which are associated oxygenates Minor BTEX components, TPH gasoline and TPH diesel <br /> Avalon Environmental Consultants 9627-001-2 <br /> Joes Truck Plaza 15600 South Harlan Road <br /> Yw <br /> March 20, 2000 7 Lathrop, California <br /> I <br />