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' results, this soil was deemed suitable for on-site re-use as backfill material During backfilling, the <br /> equipment operator compacted the backfill material with the backhoe bucket <br /> 1 2 3 Waste Soil Sampling, Analysis and Management <br /> ' On January 28, 1999, to characterize the 500 cubic yard sod stockpile generated from the UST <br /> excavation, Ramage Environmental collected 20 soil stockpile samples for two-in-one lab <br /> composite and analysis <br /> Results of the soil sampling stock ileand analysis indicate that the soil pile contained only trace <br /> P <br /> 1 concentrations of MTBE and tertiary butanol (TBA) MTBE was detected in one of the ten <br /> composite soil samples at a concentration of 0 0052 mg/kg TBA was detected in four of the ten <br /> composite soil samples at a maximum concentration of 0 18 mg/kg Based on these results, the <br /> stockpiled soil was either used as backfill or spread in the northern portion of the site <br /> ' On April 1, 1999, to characterize the sod stockpile generated from the canopy support over- <br /> excavation, Ramage Environmental collected eight soil samples from the stockpile for two-in-one <br /> lab composite and analysis To characterize another soil stockpile of approximately 50 cubic <br /> Myards on the south side of the site, Ramage Environmental collected two soil samples from the <br /> stockpile for two-in-one lab composite and analysis This soil (south stockpile) was generated <br /> from earlier UST excavation activities Following sampling, the canopy support over-excavation <br /> soil stockpile was covered with plastic sheeting <br /> ' Results of the soil stockpile sampling and analysis indicated that the canopy support over- <br /> excavation soil pile contained up to 220 mg/kg of TPH-as-gasoline and up to 1 0 mg/kg of <br /> xylenes Benzene, toluene, ethylbenzene and oxygenates were not detected in any of the sod <br /> samples collected from this stockpile Total lead was detected in only one of the soil samples at a <br /> concentration of 8 8 mg/kg The composite soil sample collected from the small south stockpile <br /> did not contain detectable concentrations of TPH-as-gasoline, BTEX, oxygenates or total lead <br /> Based on these results, this stockpile was also spread out in the northern portion of the site <br /> ' On June 7, 1999, the San Joaquin Valley Unified Air Pollution Control District approved the <br /> uncontrolled aeration of the waste soil generated by the canopy support over-excavation <br /> Fallowing approval from the City of Manteca, this soil was also spread in the northern portion of <br /> the site Results of the final disposition of the waste soil will be documented in a separate report <br /> 7 <br />