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Treatability Study Report and Feasibility Evaluation for In Situ Petroleum Hydrocarbon Remediation Field Maintenance Shop #24, 8020 South Airport Way 5.0 HVDPE TREATABILITY TEST 5.1. HVDPE EQUIPMENT The mobile test equipment for vapor extraction, supplied by CalClean, Inc., included a 25 -HP high vacuum blower (oil -sealed liquid ring pump system) capable of sustaining 100 scfm at 22 in. Hg for HVDPE testing, a moisture separator/knockout tank equipped with high/low water level switches, and a transfer pump. The transfer pump conveyed condensate into the onsite 4,000 -gallon storage tank. Vapor conveyance piping routed effluent vapors through a thermal oxidizer for treatment. The vapor extraction and treatment equipment was exempt from air permitting, as explained in Section 2.1.1. of this report. Groundwater was extracted using QED AP -4 low -drawdown bottom loading pneumatic submersible pumps suspended directly above the bottoms of the wells. The pumps were powered by compressed air from the 49 horsepower diesel powered air compressor. Water pumped during HVDPE testing was plumbed into the onsite 4,000 -gallon tank for temporary storage prior to characterization and offsite disposal. Additional equipment and supplies used for the testing and monitoring included the following: • HVDPE well head assembly allowing air and water hoses to enter/exit the well head space while maintaining the well seal; • 4,000 -gallon portable water storage tank; • Four Troll® 9500 by In Situ Inc. multi -parameter groundwater quality monitor including an optical dissolved oxygen probe; • A variety of DwyerTM Magnehelic and other differential pressure gauges to measure vacuum and/or pressure in observation wells; • Dwyer TM DS -300 averaging pitot tube with various Dwyer TM Magnehelic differential pressure gauges to measure extraction flow rates; • MiniRae 2000TM PID to measure VOC concentrations; • GasTech GT -408 multi -gas meter to measure VOCs, %LEL (as methane), oxygen, and carbon dioxide concentrations; • 100 -foot water level meter for monitoring depth to water in wells not fitted with a multi - parameter groundwater quality monitor; • Gast° oil -less vacuum pump for collection of vapor samples; • 1 Liter TedlarTM bags for advective air measurements; and Miscellaneous valves, fittings, hoses/tubing, and hardware. 5.2. TESTING PROCEDURES HVDPE feasibility testing was performed at wells FMS-MW5 and FMS-DPE1 on May 17 and May 18, 2012, respectively. The testing procedure for each well can be summarized into the following steps: 28 OTIE