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IIV\77ATC <br /> A S S O C I A T E S I N C <br /> activities and analytical results were detailed in ATC's Summary Report of Additional Subsurface <br /> Investigation, dated January 8, 1999 <br /> In December 1999, ATC personnel supervised the advancement of soil borings MW2, MW3, and <br /> MW4 at the site to depths of approximately 65 feet bgs to evaluate groundwater for the presence <br /> of petroleum hydrocarbons and determine the gradient direction and magnitude The borings <br /> were completed as monitoring wells Analytical data indicated that soil samples from boring <br /> N4W2 contained detectable concentrations of petroleum hydrocarbons Petroleum hydrocarbons <br /> ' were also detected in the groundwater from well MW2 Well MW3 contained very low <br /> concentrations of only a few constituents and well MW4 was nondetect Field activities and <br /> analytical results were detailed in ATC's Summary Report of Additional Subs-urface <br /> tInvestigation, dated February 24, 2000 <br /> ' 2.0 SUBSURFACE INVESTIGATION METHODS AND PROCEDURES <br /> To evaluate if soil vapor extraction was a viable remedial option for remediating petroleum <br /> ' impacted soil and groundwater and to evaluate the lateral extent of impacted groundwater, two <br /> soil borings were advanced in the vicinity of the former USTs and one soil boring was advanced <br /> downgradient to the southwest <br /> y2_1 Drilling Activities <br /> 2.1.1 Hollow Stem Auger Drilling Activities <br /> Hollow stem auger drilling was conducted on December 5, December 10 and December 11, 2001, <br /> by Woodward Drilling (State C57 license no 710079) Soil boring VEW 1 was advanced to <br /> approximately 35 feet bgs, and borings VEW2 and VEW3 were advanced to approximately 45 <br /> feet bgs Borings MW5, MW6, and MW7 were advanced to approximately 65 feet bgs Sol] <br /> borings VEW1, VEW2, and VEW3 were completed as 2-inch diameter vapor extraction wells <br /> and soil bonngs MW5, MW6, and MW7 were completed as 2-inch diameter groundwater <br /> monitoring wells <br /> Soil samples were collected from each soil boring at five-foot intervals The soil samples were <br /> collected using a 2-inch diameter split-spoon sampler containing three brass tubes A field <br /> geologist logged drill cuttings and soil samples utilizing the Unified Soil Classification System <br /> Descriptions of soil types encountered and sample collection intervals are included on the sal <br /> boring/well construction logs contained in Appendix A Drill cuttings were temporarily stored on <br /> site in DOT approved 55-gallon steel drums <br /> 2.1.2 Cone Penetrometer Drilling Activities <br /> Drilling was conducted on December 13, 2001 by Fisch Environmental (State C57 license no <br /> 683865) utilizing cone penetrating testing (CPT) methods A cone mounted with sensors at the <br /> tip were advanced into the soil using direct push rods at the location shown on Figure 2 The <br /> w 1625771repoM\rtfs doc 2 <br />