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I ATC Associates Inc. MkVAT C 1117 Lone Palm Avenue, Suite 201 Modesto, California 95351 209-579-2221 ASS O C I ATE S I N G . fax: 209-579-2225 STANDARD OPERATING PROCEDURE HIGH VACUUM VAPOR EXTRACTION PILOT TESL' High Vacuum Vapor Extraction Pilot Test Before performing the high vacuum vapor extraction pilot test, any necessary air permits shall be obtained and the test will be performed in accordance with any requirements stated in the permit. Ambient pressure readings will be measured at the observation wells prior to the start of the test. The pilot test wilt be conducted by applying a vacuum to a well with a blower to extract soil-gas. The test will be conducted at three steps of increasing applied vacuum. The final step of the test will be conducted at the maximum applied vacuum of the blower. A step will be considered complete when vacuum influence measured in observation wells stabilized for two consecutive readings. The following measurements will be made during each step of the test: • The vacuum applied to the well will be measured with a vacuum gauge. The applied vacuum will be controlled and adjusted with dilution valve. • The concentration of hydrocarbon volatiles and oxygen in the soil-gas extracted from the well will be monitored during each step of the test using a flame ionization detector (FID) or a photo ionization detector (PID), and Gastece meter. • The vaeurun influence in observation wells will be measured in inches of water (vacuum) with Magnehelic gauges. • The soil-gas extraction flow rate at the extraction well will be measured during each step of the test, once the vacuum has stabilized, using a thermal anemometer, or pitot tube and MagneheliQ0 gauges. A soil-gas sample will be collected at the maximum applied vacuum in a TedlarT"r bag for laboratory analysis. The samples will be analyzed for volatile fuel hydrocarbons (VFH) using Modified EPA Method 8015B and for BTEX using EPA Method 8021B at a California DHS-certified lab. The extracted soil-gas will be treated with an internal combustion engine, or thermal oxidizer. The appropriate air quality control permit will be procured for the internal combustion engine, or thermal oxidizer. The total gallons of groundwater removed during the pilot test will be recorded on a flow meter. This will be used to determine the total number of gallons extracted during the test. Depth to groundwater measurements will be collected from surrounding observation wells at periodic time intervals. The test will be conducted for 24 hours. An effluent water sample shall be collected during the pilot test. The analytical data can be used to design a groundwater remediation system. Additional sampling may be required by conditions of a discharge permit. If water is being stored in a holding tank, appropriate samples will be collected per disposal requirements. The water will be removed to an appropriate disposal facility by a licensed transporter.