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i Ceological7ecFatics Inc. Page 8 City of Escalon Project No. 750.3 February 26,2001 3.3 Piping&Manifold System It is proposed that the vapor extraction and treatment system unit (VETS - a blower and C; thermal oxidizer) be placed west of the former northern dispenser island location, on the north side of the building, for the.purpose of maximum cost effectiveness of installation and operation. The PVCpiping will be connected from then piping of the vapor extraction wells to the VETS enclosure via an underground trenching and piping system. A manifold valve unit will be used to control the direction of vapor"extraction.- The piping will be 3 inch inside L diameter to reduce the amount of airflow lost to friction. . The treatment unit will be located within a secured, fenced area with corner bumper guards. L The manifold will be equipped with control valves to route airflow from desired VEW's. Air intakes and exhaust stacks will be designed to prevent the entry of foreign matter. 3.4 Utilities Natural gas and 220-volt, single phase, electricity will need to be provided to the VETS enclosure. Natural gas service is provided to the store.by an underground pipeline from L PG&E. An additional meter will be installed on the line by PG&E so that natural gas can be supplied to the thermal oxidizer. (TO). A hard pipe gas line will run from the building, underground in the planter, to the VETS enclosure. A licensed contractor will perform this installation.., J At the same time, 220-volt, single phase, electricity will be run from the building to the VETS enclosure. A licensed contractor will also perforin this work according to code. 3.5 Extraction Blower The air will be extracted using a positive-displacement blower with a capacity of approximately 200 scfm at a vacuum at 10 inches of Hg column. A 7.5 horsepower, single- phase electrical motor powers the blower. The extracted air first passes through a liquid r knockout unit and a fabric filter to protect the blower against rapid wear from sediment L particles coming from the extraction wells. Entrained water will be condensed and collected in water knockout drum(s). Collected water will be containerized in DOT-approved drums, labeled, and stored on site. The condensed water will be hauled to a petroleum recycler. 3.6 Emissions Treatment System The emissions will be treated using a then-nal oxidizer (TO). Natural gas will be used as an auxiliary fuel source for the TO. Figure 9 is a schematic of the treatment unit. Specifications of the TO unit are enclosed in Appendix B. The blower and TO will be r secured by a locked, chain-link fence. I�