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I , <br /> i <br /> Harding Lawson Associates <br /> a four-inch Schedule 40 PVC line to two,0=pou cls _ f <br /> j. activated carbon reactors connWected in series before exiting <br /> to the atmosphere through a=_-four-inch-diameter exhaust' <br /> stack, tenjeet above the round-surf ace <br /> f "� <br /> The extraction trench will be constructed in the parking a <br /> area in front of the store with the capability to also <br /> i extract groundwater. The trench layout is shown on Plate 3 <br /> and construction details are presented on Plate 4. The t <br /> extraction trench contains four separate vapor conduits }! <br /> (two-inch Schedule 40 PVC) which lead to the treatment <br /> compound located on the west side of the convenience store. <br /> A fifth vapor line is connected to two lateral pip- <br /> s_-in the <br /> location of the former underground tank area. All-five? <br /> lnesrrare-'ma`nifolded--'above-ground- in`the treatmerit"area" to a? <br /> four-inch Schedule 40 PVC conduit with two-inch-ball.-valves... <br /> The four-inch vapor conduit is connected 'to an in-line water <br /> "knockout" container before connection to the inlet of the <br /> x vacuum blower. <br /> E The soils obtained from installation of the trench will be <br /> stockpiled along the western edge of the parking lot and <br /> covered with an impermeable plastic cover. During the <br /> evc; stockpiling, lateral screened two-inch PVC piping will be } <br />` interspersed with the soil to enable the VES to induce a <br /> flow throughout the pile and volatilize the hydrocarbon <br /> contaminants from the soil pores to be removed for treatment <br /> by the VES. The two-inch vapor laterals in the stockpile <br /> will be manifolded together into a single vapor conduit <br /> which runs aboveground to the treatment compound where it <br /> will be manifolded into the VES. After the stockpiled soils <br /> have been remediated ) � the antici ate three to four months <br /> ( p r <br /> soil will be transported to a Class III landfill facility, <br /> all above ground piping will be removed, and the parking { <br /> ti area returned to normal operation. k <br /> ' Plate 3 shows the site layout with the location of the <br /> extraction trench, the location of the existing lateral <br /> piping in the former underground tank area, the location of <br />: the stockpiled soils, and the location of the treatment i <br /> compound. % <br /> �tf <br /> 1. Basic and Control -Equipment Descriptions � <br /> (manufacturer's specifications enclosed in <br /> Attachment A) ; <br /> . r <br /> a. Vacuum Blower - One (1) Sutorbilt rotary positive <br /> displacement blower Model # 4MVL driven by a 5 <br /> Horsepower Electric motor. Maximum flow rate <br /> without restriction at 2 , 000 RPM would be f <br /> approximately 230 cubic feet per minute (CFM) . <br /> Actual rate is anticipated as 160-180 CFM. <br /> 032909P/R53 <br />