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i 0 L & M OPERABLE UNIT- FIRST QUARTER 2014 SITE STATUS, REMEDIAL SUMMARY, AND GROUNDWATER MONITORING REPORT Attachment 2 Page 3 to delineate soil and groundwater impacts previously identified in the vicinity of borings DP-1 through DP-6. In addition, Clayton performed a soil gas survey in July 2002 involving the installation of 111 Gore-Sorber0 modules to investigate the areas of greater petroleum hydrocarbon impact. Results are summarized in Clayton's Site Delineation Report, dated August 6, 2002. In December 2002, a 5-day DPE feasibility test was performed by SECOR, following the installation of seven DPE wells (DPE-1 though DPE-7). SPH were reportedly present in wells DPE-1, DPE-3, DPE-4, DPE-6, and DPE-7 prior to the initiation of testing. DPE tests were performed utilizing well 2AMW-14 for approximately 45 hours; simultaneously on wells DPE-4 and DPE-6 for approximately 28 hours; and simultaneously on wells DPE-1, DPE-3, and DPE-7 for approximately 26 hours. Results of DPE feasibility testing indicated the following: (1) a calculated radius of influence of 31 ft west of well 2AMW-14, and lower estimated radii of influence to the south and east due to the presence of low permeability clays and lower induced vacuum readings in wells DPE-3, DPE-4, and DPE-7; and (2) the removal of an estimated 196.38 pounds (lbs.) of total petroleum hydrocarbons in gasoline range organics (TPHg) from soil and groundwater, 97.02 lbs. of total petroleum hydrocarbons in diesel range organics (TPHd) from groundwater, and 9.57 lbs. of total petroleum hydrocarbons in motor oil range organics (TPHo) from groundwater. Results are summarized in SECOR's report entitled Well Installation and DPE Feasibility Report, dated January 24, 2003. An additional DPE test was performed at the Site from March 3 through 7, 2003, using a 25-horsepower (hp) liquid ring vacuum pump connected to a thermal oxidizer unit for abatement of the extracted soil vapor prior to discharge to the atmosphere. DPE tests were performed separately on wells DPE-4 and 2AMW-14 simultaneously for approximately 21.5 hours and wells DPE-4, DPE-6, and 2AMW- 14 simultaneously for approximately 72.5 hours. The DPE unit ran for a total of approximately 97 hours during the test. Groundwater and soil vapor were removed simultaneously from the test wells by applying a high vacuum to a drop tube that was lowered below the water table within each test well. Results of DPE feasibility testing indicated the following: (1) an effective radius of influence of at least 36 ft to the west of 2AMW-14; and (2) the removal of an estimated 212.3 lbs. (34.2 gallons) of TPHg from soil vapor, and approximately 0.29 lbs. (0.05 gallons) of TPHg, 17.56 lbs. (2.46 gallons) of TPHd, and 8.29 lbs. (1 .13 gallons) of TPHo from groundwater. Results are summarized in SECOR's report entitled Results of Additional DPE Feasibility Testing, dated May 23, 2003. ® Stantec