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i <br /> and collection of soil samples Excavation procedures are scheduled to commence immediately <br /> following the removal of three steel-underground storage tanks (USTs) at the site <br /> ' Soil will be excavated using a backhoe or an excavator Soil will excavated to a depth of one to two <br /> feet below the current depth of the UST inverts Soil will be placed into an excavation soil bin for <br /> transportation to an appropriate landfill class I landfill at Waste Management at Kettleman Hills or <br /> ' class 11 landfill at Forward Landfill at Stockton Excavated soil will be field screened for the <br /> presence of volatile organic compounds using an OVM,however, due to the release of waste fluids <br /> ' all waste placed into the bins will be disposed at an appropriate landfill <br /> Following the excavation and samphng clean and appropriate backfill will be placed into the <br /> ' excavation <br /> i <br /> PREVIOUS SITE INVESTIGATION <br /> On 23 and 24 October 2001,four soil probe bonngs(B1 through B4)were advanced at the site under <br /> EHD oversight Probe borings were advanced in former UST excavation and west, southwest and <br /> east of the former UST area to collect soil and grab water samples Probe boring B1 was advanced <br /> ' to a total depth of 65 feet below surface grade (bsg) and bonngs B2 through B4 were advanced to <br /> 40 feet bsg Analytical data is presented on the attached tables Locations of the soil probe borings <br /> are illustrated on Figure 2 <br /> The most intensely hydrocarbon-impacted soil was encountered in the area of the former USTs <br /> (boring B1), contaminants were not detected in analyzed soil samples collected from bonngs B2 <br /> ' through B4 At boring location B 1,petroleum hydrocarbons were detected in collected soil samples <br /> to depths of 30 feet bsg,but generally was not detected in soil samples from 40 feet bsg and below <br /> The highest hydrocarbon concentrations were encountered at depths between 10 and 20 feet bsg <br /> tHydrocarbon-impacted ground water was encountered in all four soil borings The highest <br /> concentration of dissolved hydrocarbons quantified as TPH-g,TPH-d and overall BTEX compounds <br /> were present in a water sample collected at 40 feet bsg from boring BI, at the farmer UST area <br /> However, dissolved TPH-g and BTEX concentrations decreased radially northwest, southwest and <br /> east away from the area of the UST release In addition,dissolved TPH and BTEX were detected at <br /> ' low concentrations in a grab ground water sample collected from 60 feet bsg at boring BI <br /> 1 <br /> 1 <br />