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21 June 2018 AdvancedGeo AGE Project No. 11-1847 Environmental Page 7 of 8 ggg or monitoring well and through the regenerative vacuum blower. From the vacuum blower, the extracted hydrocarbon vapor will be processed and adsorbed through the carbon canisters as part of the treatment process. Hydrocarbon concentrations in the SVE effluent stream will be measured at 1-hour intervals utilizing an OVA. During the 8-hour SVE pilot test, the vapor flow rate extracted at VW-1 will be monitored at the inlet of the vacuum blower using a Dwyer DS-200 flow sensor (inches of water) which will then be converted to standard cubic feet per minute (scfm) using a manufacture (Dwyer) supplied conversion chart. Flow rates will be measured in 30-minute intervals and documented in scfm and inches of water of differential pressure. Influent vapor samples (air flow samples) will be collected at the start-up and at two-hour intervals thereafter from the inlet of the extraction well to measure concentrations of extracted hydrocarbon vapor. The samples will be collected in 1-liter Tedlar bags using a hand air-vacuum pump. Following sample collection, the samples will be placed in a covered container and transported under chain of custody to a California Department of Health Services-certified analytical laboratory for analysis. Each sample will be analyzed within 72 hours for TPH-g, BTEX and fuel additives (MTBE, 1,2-DCA) in accordance with EPA Methods 8015M and 8260B. An 8-hour in-situ air sparge pilot test will be simultaneously conducted at the site with the above referenced 8-hour SVE pilot test. The IAS pilot test will be conducted utilizing the newly installed IAS-1 well (screened 30 to 35 feet bsg). The IAS portion of the pilot test will utilize a minimum 3-horsepower, electric air compressor to inject air beneath the water table from well IAS-1. From the outlet of the air compressor, 1-inch diameter, schedule 40 PVC piping or equivalent will be connected to the well head at IAS well IAS-1. An oil filter and air pressure regulator will be installed at the outlet of the air compressor for added controls. The injected air should strip adsorbed hydrocarbons in saturated soil and volatilize dissolved hydrocarbons in the groundwater and force hydrocarbon vapors into the vadose zone, where they could be withdrawn by the SVE extraction described above (i.e. VW-1). As part of IAS pilot test procedures, wells (IAS-2, MW-4, MW-5, MW-6) will be utilized as IAS pilot test observation points. Several parameters, including air injection rate, groundwater depth and dissolved oxygen will be measured from IAS observation points at a minimum of 2-hour intervals (i.e. every two hours). Additionally, grab groundwater samples will be collected from IAS well IAS-1 at the start and at the conclusion of the 8-hour test. Grab groundwater samples will be properly labeled, stored on ice and transported under chain-of-custody procedure to a CDPH-certified laboratory for analysis of: TPH-g and TPH-d by EPA Method 8015 Modified; BTEX compounds, Fuel Oxygenated Compounds (MTBE, TAME, DIPE, ETBE, TBA), 1,2-DCA, EDB and Naphthalene by EPA Method 8260 Modified.