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' 05 May 1997 • AGE-NC Project No 95-0112 Page 4 of 14 are summarized on Table 3 The vapor extraction pilot test was described in the PAR prepared by ' GAS A Final Remedial Plaii(FRP)was prepared by GAS in July 1994 Soil vapor extraction(SVE) and in-situ air sparging (IAS) were recommended for soil and ground water reinediation at the site 1 27 PURGED WATER/ STOCKPILED SOIL DISPOSITION On 03 September,purge water stored on the site,,vas transported to PRC Patterson,Inc , for disposal The purge water was transported under non-hazardous waste manifest by Nor Cal Oil of Turlock Purge water disposal was discussed in the Qua;tei ly Repot t - Octobei 1995 prepared by AGE Currently approximately 150 gallons of purge water is stored on-site in 55-gallon DOT drums Soil from the advancement of monitoring wells and confinnatoiy soil borings is currently stockpiled on- site on plastic sheeting and spread for aeration ' 3 0. SOIL AND GROUND WATER REMEDIATION ' • 3 1 SOIL VAPOR EXTRACTION In July 1995, an SVE/IAS system was installed inside a fenced enclosure at the southea5- co,ner of ' the Art& Artists building PVC piping was installed from RW-I and MW-1 to the extraction unit and from S WA and SW-2 to the spas ging unit Operation of the remediation system began in August 1995 Installation of the SVE/IAS system was described in the Quaff tei ly Repoi t - July 1995 prepared by GAS The SVE system extracted an average of 70 to 75 cubic feet per minute (cfm) of vapor from RW-1 during operation The SVE system operated at the site from 13 July 1995 until 26 Februaiy 1997 The extraction unit operated a total of 10,559 hours, or 74% of the time A photo-ionization detector (PIT) Thermo Environmental 580A, 10 OeV, calibrated to isobutylene) was used to monitor the extracted ' hydiocarbon vapor and SVE unit discharge on a regular basis The PID reading, elapsed engine operational time and supplemental fuel consumption was measured and recoided (Table 2) Soil vapor samples were collected in October 1995 and monthly since January 199E to inonitoi "remediation progress at the site The final vapor`sariiple was collected ori26-February 1997 -All soil vapor samples were collected in a Tedlar bags and transported in a cool container under chain-of custody to McCainpbell Analytical, Inc (MAI) in Pacheco, California Samples were analyzed . within 72-hours for TPH-g and BTE&X in accordance with EPA methods 5030 and 602, respectively