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Stockton Promenade—N. Ediso l treet USTs& Utility Corridors • Page 13 <br /> Underground Storage Tank Removal Report June 8,2009 <br /> ' WKA No. 7345.09 <br /> • There were detectable VOC concentrations in the two soil samples analyzed from direct- <br /> push boring EB-1 <br /> • Detected metal concentrations in the two direct-push soil samples were not considered <br /> ' problematic when compared to the corresponding health risk based screening levels <br /> 6.5 Grab Groundwater Samples <br /> ' Three grab groundwater samples were collected from three boring locations. Depth to water <br /> measurements ranged from 11 to 23 feet bgs in the three boring locations, however these depths <br /> correspond to depths from ground surface conditions during the day of field activities. <br /> i <br /> • TPHd was detected in one of the three grab groundwater samples at 1,300 gg/L(EB-2- <br /> GW) <br /> • TPHmo was detected in each of the three grab groundwater samples ranging from 5,100 <br /> ' µg/L (EB-1-GW) to 800 µg/l, (EB-3-GW) <br /> • TPHg was detected in two of the three grab groundwater samples ranging from 23,000 <br /> ' µg/L(EB-I-GW) to 6,200 gg/L(EB-3-GW) <br /> • There were detectable concentrations of VOCs in two of the three grab groundwater <br /> ' samples. The most notable of these VOCs was benzene at 9.3 gg/L (EB-3-GW) and 2.9 <br /> µg/L(EB-1-GW) <br /> ' • Detected metal concentrations were not considered problematic when compared to the <br /> corresponding commercial health risk based screening levels <br /> t <br />