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and DPE-6 for approximately 28 hours; and simultaneously on wells DPE-1, DPE-3, and DPE-7
<br /> for approximately 26 hours. Results of DPE feasibility testing indicated the following: (1) a
<br /> calculated radius of influence of 31 feet west of well 2AMW-14,'and lower estimated radii of
<br /> influence to the south and east due to the presence of low permeability clays and lower induced
<br /> vacuum readings in wells DPE-3, DPE-4, and DPE-7; and (2) the removal of an estimated
<br /> 196.38 pounds of total petroleum hydrocarbons in gasoline range organics (TPHg)from soil and
<br /> groundwater, 97.02 pounds of total petroleum hydrocarbons in diesel range organics (TPHd)
<br /> from groundwater, and 9.57 pounds of total petroleum hydrocarbons in motor oil range organics
<br /> (TPHo)from groundwater. Results are summarized in SECOR's report entitled Well Installation
<br /> and DPE Feasibility Report, dated January 24, 2003.
<br /> An additional DPE test was performed at the Site from March 3 through 7, 2003, using a
<br /> 25-horsepower(hp) liquid ring vacuum pump connected to a thermal oxidizer unit for abatement
<br /> of the extracted soil vapor prior to discharge to the atmosphere. DPE tests were performed
<br /> separately on wells DPE-4 and 2AMW-14 simultaneously for approximately 21.5 hours and
<br /> wells DPE-4, DPE-6, and 2AMW-14 simultaneously for approximately 72.5 hours. The DPE unit
<br /> ran for a total of approximately 97 hours during the test. Groundwater and soil vapor were
<br /> removed simultaneously from the test wells by applying a high vacuum to a drop tube that was
<br /> lowered below the water table within each test well. Results of DPE feasibility testing indicated
<br /> the following: (1) an effective radius of influence of at least 36 feet to the west of 2AMW-14; and
<br /> (2) the removal of an estimated 212.3 pounds (34.2 gallons) of TPHg from soil vapor, and
<br /> approximately 0.29 pounds (0.05 gallons) of TPHg, 17.56 pounds (2.46 gallons) of TPHd, and
<br /> 8.29 pounds (1.13 gallons) of TPHo from groundwater. Results are summarized in SECOR's
<br /> report entitled Results of Additional DPE Feasibility Testing, dated May 23, 2003.
<br /> From March 10 through April 9, 2003, 12 shallow zone groundwater monitoring wells (MW-18
<br /> through MW-23, MW-25, MW-28, MW-30, MW-31, MW-33, and MW-34), eight deep zone
<br /> groundwater monitoring wells (MW-16, MW-17, MW-24, MW-26, MW-27, MW-29, MW-32, and
<br /> MW-35) were installed, and seven soil borings (SB-1 through SB-6 and MW-16A) were
<br /> advanced at the Site. Results are summarized in SECOR's report entitled Additional
<br /> Assessment Report, dated May 30, 2003.
<br /> From Octoberthrough December 2003, five additional DPE wells (DPE-8 through DPE-12)were
<br /> installed and a DPE remediation system was installed at the site. The DPE system is
<br /> connected to wells DPE-1 through DPE-12. Additionally, a Non-aqueous Extraction Technique
<br /> (NETTM) SPH removal system was installed at well 2AMW-14. System installation activities
<br /> are summarized in SECOR's report entitled DPE Well and System Installation Report, dated
<br /> December 5, 2003.
<br /> On December 17, 18, and 22, 2003, exploratory excavations were conducted at the site to
<br /> locate underground utilities including former product pipelines. Steel pipelines were discovered
<br /> at the site at 14 locations. Results are summarized in SECOR's report entitled Revised
<br /> Underground Utility Search Report, dated March 5, 2004.
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