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L & M OPERABLE UNIT - THIRD QUARTER 2013 SITE STATUS, REMEDIAL SUMMARY,
<br /> AND GROUNDWATER MONITORING REPORT
<br /> Appendix B
<br /> Page 3
<br /> (TPHd) from groundwater, and 9.57 lbs. of total petroleum hydrocarbons in motor oil range
<br /> organics (TPHo) from groundwater. Results are summarized in SECOR's report entitled Well
<br /> Installation 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 ft to the west of 2AMW-14; and
<br /> (2) the removal of an estimated 212.3 lbs. (34.2 gallons) of TPHg from soil vapor, and
<br /> approximately 0.29 lbs. (0.05 gallons) of TPHg, 17.56 lbs. (2.46 gallons) of TPHd, and 8.29 lbs.
<br /> (1.13 gallons) of TPHo from groundwater. Results are summarized in SECOR's report entitled
<br /> 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 S13-6 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 October through 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 are
<br /> 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.
<br /> In January 2004, SECOR completed construction of the DPE system. Electrical power and
<br /> natural gas service were established by Pacific Gas and Electric (PG&E) on March 4, 2004.
<br /> Under the conditions of the initial air permit for the DPE system issued by the San Joaquin
<br /> Valley Air Pollution Control District (SJVAPCD) in April 2003, which covered the first six months
<br /> of system operation utilizing propane as a fuel source, startup of the DPE system was
<br /> 5tantec
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