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30 January 2015 <br /> AGE Project No. 14-3154 <br /> Page 4 of 9 <br /> laboratory and were analyzed selectively for the following chemical constituents: <br /> • Total petroleum hydrocarbons quantified as gasoline, diesel and oil range <br /> compounds (TPH-g/d/o) in accordance with EPA Method 8015 Modified; and <br /> • Volatile organic compounds (VOCs), including chlorinated VOCs and "BTEX" <br /> compounds and fuel additives/fuel oxygenates (methyl tertiary butyl ether <br /> [MTBE], tertiary butyl alcohol [TBA], di-isopropyl ether [DIPE], ethyl tertiary butyl <br /> ether [ETBE], tertiary amyl methyl ether [TAME] and lead scavengers 1,2- <br /> dichloroethane [1,2-DCA] and 1,2-dibromomethane [EDB]) in accordance with <br /> EPA Method 826013; <br /> • Polychlorinated bi-phenols (PCBs) in accordance with EPA Method 8082. <br /> • Polynuclear aromatic hydrocarbons (PNA), polycyclic aromatic hydrocarbons <br /> (PAH) or semi-volatile organic compounds (SVOCs) in accordance with EPA <br /> Method 8270. <br /> • California Assessment Metals (CAM 17) CAM 17 Metals Total Threshold Limit <br /> Concentration (minimally: lead, cadmium, chromium, nickel and zinc) by EPA <br /> Method 601013/7471. <br /> BORING ABANDONMENT <br /> Following sample collection, each soil boring was permanently sealed to prevent vertical <br /> migration of potential contaminants. Soil borings were destroyed by backfilling with <br /> cement grout from the total depth to surface grade. Borings advanced below the <br /> groundwater table were abandoned with grout utilizing tremie procedures. Backfilling <br /> activities were conducted under inspection by the SJCEHD. <br /> 1.6. OVERALL FINDINGS <br /> Soil stratigraphy was determined from field data collected during advancement of the <br /> soil borings; hydrocarbon and metals impact to soil was quantified by laboratory <br /> analyses of the soil and groundwater samples. <br /> STRATIGRAPHY <br /> Generally, tan, brown to dark brown, silts and sands were encountered between surface <br /> grade and approximately 15 feet bsg. Fine to medium, well graded, sands were <br /> encountered at depths between 15 feet and 20 feet bsg. Silt and clay was observed in <br /> the deepest soil samples collected at 25 feet bsg. Saturated soil was encountered from <br /> borings at depths of 15 feet bsg; while free groundwater was present at 20 feet bsg. No <br /> hydrocarbon-like odors were observed in samples collected from borings. Organic vapor <br /> Advanced GeoEnvironmental Inc. <br />