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16 <br /> Three of the five sod samples contained slightly elevated concentrations of total lead (up to 91 <br /> mg/kg) To further evaluate these lead concentrations, the laboratory combined the five samples <br /> ' into one composite and re-analyzed the sample for total lead and soluble lead The results <br /> indicated that the lead content in the soil was below hazardous concentrations outlined in Title 22 <br /> of the California Code of Regulations <br /> On November 22, 1999, PHS/EHD approved the transfer of the remediated sod to the City of <br /> 1 Manteca Police Confidence Course On December 3, 1999, Bob Evans Trucking loaded and <br /> transported the remediated soil to the Police Confidence Course in 64 loads, using ten-wheel <br /> trucks According to Bob Evans Trucking, each truck was loaded with approximately 8 cubic <br /> yards of sod, for a total soil volume of 512 cubic yards transported <br /> 12 3 Preliminary Investigation and Evaluation <br /> On September 2, 8, and 9, 1999, in order to evaluate the extent of impacted soil and/or <br /> groundwater, Ramage Environmental supervised the drilling of 11 on-site Geoprobe® sod borings <br /> (Figure 2) Soils observed in the 11 sod borings consisted of massive sand intervals interrupted <br /> ' by alternating thinly-bedded sequences of clay, silt and fine sand mixtures Groundwater levels <br /> measured in each of the soil borings ranged from 17 5 to 19 0 feet bgs <br /> Vertically, the extent of impacted soil beneath the site was defined in six of the 11 soil borings <br /> Laterally, the majority of the petroleum hydrocarbon mass in soil is concentrated at approximately <br /> ' 25 feet bgs The concentrations of MTBE detected in the deeper soil samples are present in the <br /> northeastern and northern portions of the site <br /> 1 The groundwater samples from all 11 of the soil borings contained a detectable concentration of <br /> at least one of the compounds analyzed The highest concentrations of TPH-as-gasoline (62,000 <br /> micrograms per liter[µg/1]) and benzene (230 µg/l) were detected in SB-6, north of the dispensers <br /> The highest concentrations of MTBE (9,600 µg/1), TBA (180 µg/1), tertiary amyl methyl ether <br /> ' (TAME) (14 µg/1) and di-isopropyl ether (DIPS) (3 8 µg/1) were detected in SB-10, northeast of the <br /> UST excavation Only the groundwater sample collected from the on-site domestic well was free <br /> of detectable concentrations of TPH-as-gasoline, BTEX, and/or oxygenates <br />