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�i M 02 January 2007 AGE-NC Project No. 95-0121 Page 3 of 10 • hi February 2000, SVE remediation was initiated on the shallow water table at the site by applying a vacuum to wells VW- 1, V W-3, VW-4, VW-5, VW-6, VW-7, VW-8 and VW-9 utilizing aregenerative vacuum blower and two 55-gallon carbon canisters; during this time, IAS remediation was initiated at the site on wells AW4 , AW-2, AW-3, AW4 and AW-5. SVE and IAS procedures for the site were described in a modification letter dated 04 February 2000, prepared by AGE and approved by the EHD by letter on 07 February 2000. • Between 15 February 2000 and 31 March 2000, the SVE and IAS remediation system was operational for 1 ,056 hours. During the operational period, flow rates ranged from 18 to 30 standard cubic feet per minute (scfm) at differential pressures between 0. 10 to 0.30 inches of water; the induced vacuum stabilized at approximately 0.25 inches of water during this start-up period of the remediation system. • Between 01 April 2000 and 30 June 2000, the SVE and LAS remediation systems were operational for 2, 184 hours. During the operational period, SVE inlet flow rates ranged from 39 to 48 cubic feet per minute (cfm); differential pressures ranged between 0.5 and 0.75 inches of water; and induced vacuum between 15 and greater than 25 inches of water. Utilizing a photo ionization meter (PID), hydrocarbon concentrations were measured between 8 and 32 parts per million (ppm) at the SVE inlet. • The mass of hydrocarbons extracted from the inlet of the SVE system was calculated to be approximately 57.58 pounds of petroleum hydrocarbons during the second quarter 2000 monitoring period. • Between 01 July 2000 and 30 March 2001 SVE and IAS using procedures described by a modification letter dated 04 February 2000, prepared by AGE and approved by the EHD by letter dated 07 February 2000. • On nine separate occasions, between June and October 2003, free-phase floating petroleum product was measured ranging from 0.06 to 0.90 feet in well VW4 utilizing a Solinst Interface Probe; thereafter, a clear, disposable polyethylene bailer was utilized at the well to remove floating petroleum product and ground water; bailing activities continued (approximately 2 to 6 gallons) until product could not be observed. • On 03 February 2004, SVE remediation was re-initiated at the site by applying a vacuum to wells V W- 1 through VW-9 utilizing aregenerative vacuum blower andtwo 55-gallon carbon canisters. SVE procedures for the site were described in an AGE-prepared modification letter, dated 04 February 2000 and approved by the San Joaquin County Environmental Health Department (EHD) by letter dated 07 February 2000. • Between 03 February 2004 and 22 June 2004, the SVE remediation system was in continuous operation at the site. • Between 03 February and 22 June 2004, the SVE unit operated for approximately