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Iffiers'Tanc. SACRAMENTO <br /> The system is equipped with an air dilution valve, which <br />' allows manual control of the vapor concentration being processed <br /> by the system. The system has in-line sampling ports to insure <br /> that concentrations of volatile organic compounds are below the <br /> lower explosive limit (LEL) at all times, and that the <br /> concentration of fuel hydrocarbons in the post--treatment air <br /> represents at least a 90 percent reduction from original <br /> concentrations. <br />' The Carbtrol adsorption canisters that will lower the fuel <br /> hydrocarbons in the treated air are two 55-gallon drums each <br />' filled with 200 pounds of virgin activated carbon connected in <br /> series to prevent breakthrough. <br /> The emission stack will either be constructed to emit the <br /> treated air above the adjacent building (approximately 20 feet <br /> above ground level) and away from human habitation, or will be <br /> modified so the treated air will be injected into another well . <br /> Manufacturer equipment specifications are included. <br /> 4 . 0 OPERATING SCHEDULE <br />' The pilot study will continue for approximately four months <br /> from the start of operations. The equipment described above will <br /> operate twenty-four hours a day for the duration of the study. <br /> 5. 0 SAMPLING <br /> Field sampling of the treated vapor will be conducted <br /> frequently in the first hours of equipment operation with an <br /> organic vapor analyzer (OVA) using flame ionization detection <br /> (FID) . The schedule for collection of samples to be submitted <br />' for laboratory analysis will be determined based upon the <br /> effectiveness of the treatment system as determined by field <br /> analysis. Samples will be collected every two weeks at a <br /> minimum. Sampling will be conducted to insure that the treatment <br /> is effectively reducing the concentrations of petroleum <br /> hydrocarbons by 90 percent or more. <br />