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�� KLEINFELDER <br /> encountered the wooden structure during grading activities on February 24, 2005, and <br /> immediately stopped work in the area. Mr. Lawley stated that no "tank" top was encountered <br /> ' during the grading and that soil removed from above the wood area was stockpiled immediately <br /> adjacent to the area. Kleinfelder attempted to dig within the wooden circle to visually assess the <br /> ' extent of potential contaminated soil. Viscous black liquid was noted when digging within the <br /> tank area. Hand digging was not conducted at depths deeper than approximately 1% feet below <br /> ground surface due to stiff clays and concrete material. The migration of the black liquid <br /> ' appeared to be localized and discolored soil was noted primarily in near proximity to the black <br /> liquid product. At the request and direction of Mr. Jackson, Kleinfelder collected a soil sample <br /> (No. 30102-T1-6") from approximately 6-inches below the surface within the wooden circle. <br /> ' The sample was collected from an obviously impacted area for the purpose of characterizing the <br /> potential contaminants. Free product was noted in the soil sample. The soil sample was <br /> collected using a pre-cleaned stainless steel sampler attached to a slide hammer. The sample <br /> was labeled and stored in an iced cooler, then transported to Precision Enviro-Tech Analytical <br /> ' Laboratory of Stockton, California. <br /> The single soil sample was analyzed on a 24-hour rush turn-around time for the following; <br /> • Total Purgeable Petroleum Hydrocarbons (Gasoline Range) [TPH-G] by EPA Method 8260 <br /> • Benzene, toluene, ethylbenzene, xylenes [BTEX] by EPA Method 8260 <br /> • Total Extractable Petroleum Hydrocarbons as referenced to Diesel [TPH-D] by EPA Method <br /> ' 8015M. <br /> • Chlorinated Hydrocarbons by EPA Method 8260 <br /> • Metals (Cd, Cr, Cr VI, Ni, Pb, and Zn)by EPA 6000/7000 Series Method <br /> • Oxygenates (TBA, MtBE, DIPE, ETBE, and TAME)by EPA Method 8260 <br /> • Polychlorinated Biphenyls [PCBs] by EPA Method 8082 <br /> ' No TPH-G, oxygenates, or PCBs were detected in the soil sample collected. <br /> The following table summarizes the selected concentrations of detected analytes in the soil sample. <br /> Analyte Units Concentration Industrial PRG <br /> TPH-D 140,000 NA <br /> ' Acetone 49 5,400(1) <br /> Benzene 7.67 1.4(2) <br /> Ethylbenzene 0.0388 400 <br /> iToluene Mg/kg 0.0935 520 <br /> Xylenes 0.1338 420 <br /> Bromomethane 64 13(l) <br /> Chloromethane 54 160(2) <br /> Methylene Chloride 8.6 21(2) <br /> 51276/ST05R272/FB:ly Page 2 of 8 <br /> Oc 2005,Kleinfelder,Inc. March 9,2005 <br />