Laserfiche WebLink
iL <br /> 0 <br />, 6L L ) <br /> A S S O C I A T E S I N C <br /> In order to assess the potential presence of hydrocarbons at the site a soil vapor survey was <br /> performed in March 1990 Soil vapor samples were collected from 29 locations at approximate <br /> depths of 18 to 22 inches bgs Low levels of volatile organic compounds (VOCs) were detected <br /> in the soil vapor on-site during the survey In October 1990, RESNA Industries Inc (RESNA) <br /> hand augured 19 shallow soil borings to help determine the extent of petroleum hydrocarbons in <br /> soil in the vicinity of the product line leak Soil samples were collected at approximately 4 feet <br /> bgs and screened for possible volatile organic vapors using a photoionization detector (PID) <br /> PID readings ranged from 0 to 1,032 parts per million (ppm) <br />' In March and April 1991 to provide additional information regarding subsurface conditions at <br /> P � P g g <br /> the site, RESNA supervised the drilling of five borings to be completed as groundwater <br /> monitoring wells MW-1 through MW-5 (Figure 2) Petroleum hydrocarbon constituents were <br /> only detected in the soil sample collected from 2 5 feet bgs in boring MW-2 Analytical results <br />' of groundwater samples indicated that wells MW-3, MW-4, and MW-5 contained detectable <br /> petroleum hydrocarbons Quarterly monitoring and sampling of the groundwater monitoring <br /> wells on site was initiated in October 1991 <br />' In July 1991, RESNA personnel witnessed the removal of the 2,000-gallon regular gasoline UST <br /> and the associated product line No holes were observed in the UST Sol] samples were <br /> collected beneath the UST and product line and contained only toluene at 0 045 ppm <br /> In September 1993, RESNA supervised the advancement of a boring to be completed as <br /> groundwater monitoring well MW-6 Soil encountered during drilling was monitored for <br /> organic vapors using a PID No evidence of soil contamination was noted Analytical results of <br /> groundwater samples indicated only toluene was detected, at a concentration of 38 parts per <br /> billion (ppb) <br /> In August 1995, due to infiltration of organic debris in groundwater monitoring well MW4, Smith <br /> Environmental Technology Corporation destroyed well MW4 by overdnlling the PVC casing and <br /> sand pack in the well boring with 8-inch diameter hollow-stem augers Smith also supervised the <br /> advancement of a boring for groundwater monitoring well MW4R to replace well MW4 <br />' Analytical results of the soil samples collected from the boring for monitoring well MW4R <br /> indicated that petroleum hydrocarbons were detected only in the sample collected from 6 5 feet bgs <br /> Petroleum hydrocarbon constituents have not been detected in groundwater samples collected <br /> from monitoring well MW-4R <br /> In January and February 1996, SECOR advanced ten soil borings at the site Soil samples and <br />' grab groundwater samples were collected from the borings Only one soil sample contained <br /> detectable concentrations of petroleum hydrocarbons at low levels Groundwater samples <br /> collected from bonngs SB2 and SB26 contained elevated concentrations of petroleum <br /> hydrocarbons and trace amounts of free product <br /> In July and August 1999, ATC Associates Inc advanced ten soil borings (Figure 2) to evaluate <br /> the extent of petroleum hydrocarbons and trace amounts of free product detected by SECOR <br />' W 1625i4Veporlslsup_suh_tnv doe 2 <br />