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1 <br /> 29 January 2002 <br /> ' AGE-NC Project No. 98-0466 <br /> Page 12 of 25 <br /> ' (PCE). Sample 70858, collected at 5 feet bsg in the south bum pit did not contain detectable <br /> concentrations of these analytes. No other samples were analyzed r solvents. Three samples <br /> (63599, 70858 and 70864 -south bum pit, 5 feet bsg) contained 15 mg/kg, 26 mg/kg and 18 mg/kg <br /> ' diesel-range hydrocarbons. Five other samples from 5 feet bsg and 15 eet bsg in the two bum pits <br /> did not have detectable concentrations of diesel-range hydrocarbons. <br /> ' Following excavation of the bum pits and teepee area, soil samples co ected from the excavation <br /> walls and floors in 1994 by Stockton Service Station Equipment Co any (SSSE) contained lead <br /> ' concentrations ranging from less than 4 mg/kg to 10 mg/kg. Soil samples collected from the teepee <br /> area in 1994 contained arsenic concentrations were equal to or less th 0.55 mg/kg - less than the <br /> the mean background concentration in California soils and less than e PRG for industrial soil. <br /> ' Concentrations for the other metal analytes did not exceed the TTLC, STLC or applicable PRGs. <br /> Sampling location and analytical results were included in AGE's Site En vironmental History report, <br /> dated 04 May 2001. <br /> ' AGE visited the bum pit areas on 15 October 1999 and noted that the excavated soil is still <br /> stockpiled on site east and north of the burn pit area. The north burn pit d approximate dimensions <br /> of 45 feet x 47 feet x 14 feet depth, with a volume of approximately 1 100 cubic yards. The south <br /> bum pit had dimensions of approximately 30 feet x 40 feet x 10 feet deep, with a volume of <br /> approximately 450 cubic yards. A drawing of the teepee area shows a ircular area with a 57-foot <br /> ' diameter that is excavated to a depth of 4.5 feet, for a potential volume of approximately 850 cubic <br /> yards. <br /> ' 3.0. PROCEDURES <br /> ' On 01, 02 and 15 November and 17 December 2001, AGE advanced 2 soil borings at the site to <br /> assess soil and groundwater for contaminants known or suspected to h1ve been used or released in <br /> the areas investigated. Soil borings PBI through PB12 were all advanced to collect grab ground <br /> ' water samples; in addition, soil samples were collected from borings PBI through PB7 and PB9. Soil <br /> probe borings were advanced at the site as follows: <br /> ' • Soil borings PBI and PB2 were advanced in the former truck parking area located in the <br /> southern portion of the property. Borings PB 1 and PB2 were a Ivanced to 60 feet bsg; <br /> ' • Soil boring PB4 was advanced near the former"Penta Tank"to ated just south of the Cover <br /> Plant to a depth of 55 feet bsg; <br /> ' • Soil boring PB3 was advanced near the south steam cleaning ar a to a depth of 60 feet bsg; <br /> • Soil borings PB5 and PB6 were advanced near the western ditch area to depths of 60 feet <br /> bsg; <br /> - Advanced GeoEnviron ental,Inc. <br /> 1 <br />