Laserfiche WebLink
MANAGEPS DESgNERStONSWT4MS <br /> 4.0 CONCLUSIONS <br /> ILI <br /> Based on the analytical data, soil contamination observed in the base of the former UST <br /> excavation it is not resent below <br />� P„ p 35 feet bgs. Field observations further indicate that the soil <br /> - contamination is likely vertically confined to the silty sand underlying the former UST by a clay ; <br /> layer that extends from approximately 25 feet to 56 feet bgs. Laterally, soil contamination does <br /> not extend past SB-4, which is located 15 feet from the former UST. <br /> Based on samples collected from the Hydropunch sampler,) groundwater has not been impacted <br /> by petroleum hydrocarbons below or in the estimated up-gradient direction of the former UST.. <br /> However, 60.feet north (presumed down-gradient direction)of the former UST groundwater has <br /> 1 r- been impacted by low concentrations of benzene (0.7 ug%L) and TPH-G (0.22 mg/L). The <br /> L concentration of benzene is below the EPA maximum contaminant level (MCL) of 1 ug/L. <br /> i <br /> i <br /> The concentration of zinc (0.01 mg/L) detected in the groundwater sample from SB-1 (located <br /> beneath the former UST) is significantly below the EPA secondary MCL of 5 mg/L. <br /> I <br /> i <br /> I <br /> II �, <br /> h <br /> 4 <br /> !J <br /> I <br /> L:\....\PEPBOYSMESTLN.REP 11 Nm.1997 <br /> f <br /> i <br /> r <br />