ARCHIVED REPORTS_XR0008575 - Laserfiche WebLink

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1 . STANDARD OPERATING PROCEDURE ' AIR SPARGE, SOIL VAPOR EXTRACTION,AND COMBINED AIR SPARGE/SOIL VAPOR EXTRACTION PILOT TEST Vapor Extraction Pilot Test Before performing the vapor extraction pilot test (VEPT), 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 will 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 Gastech®meter ' • The vacuum influence in observation wells will be measured in inches of water (vacuum) with Magnehelice 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 Magnehelico gauges ' A soil-gas sample will be collected at the maximum applied vacuum in a TedlarTM 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 8021E 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 ' Air Sparge Pilot Test The air sparge test will be performed by infecting atmosphenc air into the saturated zone through an air sparge well and monitoring the influence at observations wells Ambient groundwater level and DO readings will be measured at the observation wells prior to the start of the test The test will be performed at three different flow rates, 2, 5, and 10 acfm The test will be conducted at three steps of increasing flow I rate A step will be considered complete when the groundwater level and DO measured in observation wells stabilized for two consecutive readings, or at the discretion of personnel conducting the test The vapor extraction system will be operated during the air sparge pilot test The vapor extraction system will be operated at a constant flow rate to capture hydrocarbon vapors produce by air sparge Personnel conducting the test will determine the extraction flow rate The air sparge test will be conducted using a compressor, associated flow rate and pressure gauges, DO and I water level meters All above ground air pressurized piping will be metal or hose suitable to the application Prior to beginning the test the following measurements will be made at the surrounding observation wells • The groundwater level will be measured to the nearest 0 01 foot with a Solmst0 electronic interface probe, or equivalent in the observation wells • The down hole groundwater DO concentration in the observation wells