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SECOR
<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 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 /> performed and initial groundwater and air influent and effluent samples were collected on March
<br /> 18, 2004. SECOR submitted a request to the SJVAPCD for modifying the existing air permit,
<br /> which included the operation of the DPE system using natural gas rather than propane, and
<br /> extension of the life of the permit to cover five years of operation. SJVAPCD required that the
<br /> revised permit be resubmitted for public review over a 30-day period, which ended on July 15,
<br /> 2004. Throughout the duration of the review period, the SJVAPCD did not authorize the
<br /> operation of the DPE system under the existing permit dud to minor detections of polyaromatic
<br /> hydrocarbons (PAHs) in the effluent sample collected on March 22, 2004. Since no public
<br /> comments were received by July 15, 2004, the SJVAPCD issued the revised air permit on July
<br /> 20, 2004. Initial start-up and shake-down of the DPE system was performed on August 2 and 3,
<br /> 2004. The DPE system was temporarily deactivated on August 3, 2004, during the removal and
<br /> abandonment of former pipelines found near the remediation system compound. To
<br /> accommodate the excavation of the abandoned former pipelines and surrounding petroleum
<br /> hydrocarbon-impacted soil, the remediation system conveyance lines and nearby sewer and
<br /> water lines were also dismantled.
<br /> Concurrently during the installation of the DPE system, SECOR submitted the report entitled
<br /> Work Plan For Pipeline Abandonment, Removal, and Soil Vapor Extraction Well Installation,
<br /> dated April 15, 2004. This report outlined a plan for abandoning or removing the steel pipelines
<br /> • that were discovered during the December 2003 underground utility search on the Parcel 2A
<br /> 1 Q08QSSRQRSRQMR.Final.doc 4 April 30,2008
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