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Mr. Kyle Christie%wool January 24, 1996 Page 2 Results The soil samples were analyzed for total petroleum hydrocarbons as gasoline (TPH-G), and benzene, toluene, ethylbenzene, and xylenes (BTEX) using EPA Method 5030/8020 and 8015 Modified. At the request of Mr. Michael Kith of the County, the samples were also analyzed for total lead using EPA Method 6010. All of the soil samples were submitted to Sequoia Analytical of Sacramento, California. Table 1 presents the TPH-G/BTEX and total lead concentration for each of the samples collected. Appendix B contains the complete laboratory report. S Figure 2 is a site map presenting the soil sample locations, analytical data, and excavation limits. BTEX constituents were not identified above the laboratory detection limit in samples T-1 through T-9, and T-11. One or more of the BTEX constituents were identified in very low concentrations in T-10,T-12, and T-13. TPH-G was not identified in samples T1 through T-13. Hydrocarbons were identified in the soil at high concentrations using a Micro Tip Photo Ionization Detector (PID) in the soil in the vicinity of product dispenser one and two (sample T-14). The area near sample T-14 was over excavated and PID readings were taken at 5 feet and 8.5 feet below bottom of the trench. PID readings were 110 parts per million (ppm), and 150 ppm respectively. At an excavation depth of 11 feet, the PID readings were considerablely lower. The final excavation dimensions in the area of product dispensers one and two was 11 feet in length by 7 feet in width by 11_5 feet in doth. Soil sample T-14-11. 5A was collected from the bottom of the excavation. Groundwater was not encountered during the investigation. The soil stockpile was estimated at 60 to 70 cubic yards. rdid e analytical results for sample T-14, taken at a depth of 1.5 feet, indicated a TPH-G ncentration of 360,000 milligrams per kilogram (mg/kg). The benzene concentration in mple T-14 was 5,600mg/kg. Sample T-14-11.5A, collected at the bottom of the excavation not contain detectable TPH-G. The benzene concentration in sample T-14-11.5A was 87 mg/kg. In addition to the EPA 5030 extraction for TPH-G and BTEX, sample T-14-11.5A was analyzed for TPH-G and BTEX using the Toxicity Characteristic Leaching Potential (TCLP) extraction using a zero headspace extraction vessel. The purpose of performing this test is to determine the potential for hydrocarbon constituents to leach into the groundwater. The analytical results of the TCLP analysis indicated that hydrocarbons will not leach into the groundwater from this sample location (none of the constituents were identified above detection limits). A complete laboratory report for the TCLP analysis is included in this letter as Appendix C. The analytical results for total lead indicated the presence of lead in all soil samples obtained. Based on a conversation with Mr. Harlan Knoll of the County, the lead levels in the soil may Use or disclosure of data continued on this sheet is subject to the restriction specified at the beginning of this document. 24 l'TR EPO RTSIS U M M.DOC