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r <br /> Yr � a.. <br /> . ... K <br /> On 10 <br /> f <br /> B. Proposed Remediation System <br /> The proposed remediation will consist g atstripping wo stower <br /> a ground water clean-up, <br /> vent system and using <br /> and surface discharge. <br /> Vent 5 sy tem <br /> W At completion of ercavativn, three 4" vacuum vents were <br /> installed North-South across the bottom of the pit; and each <br /> runs to the surface with a 4' PVC riser. The horizontal vent <br /> lines were buried in pea gravel and each line separated from the <br /> adjoininq.`line with silty clay backfill. Bee Plate Nos. 2 and 3. <br /> Two 2" PVC vents, 20 feet long, were installed horizontallY <br /> along the face of the excavation abutting the lube pit. <br /> These <br /> e- The <br /> lines are connected <br /> to the vent and the fathe surface ce 2P <br /> e of theexcaVC vation are <br /> screened bort <br /> covered with pea gravel <br /> i <br /> Each vert line will be controlled with a 3" ball valve; and <br /> - each line will hake a -1/2* vacuum tag. The vacuum pump will be a <br /> 2.5 HP FU.iI model 4Z753 ring compressor capable of producing a <br /> 50" water vacuum at 70 cfm air flow. If additional flow is <br /> required, pumps can be connected i.ii series. <br /> Venting will be done after an air discharge permit is <br /> J: obtained from tre APCD and at a rate specified in the permit. <br /> Monitor Well MW 1 & 3 can be used to measure the radius of <br /> the vacuum or the vent system can be used by shutting -.flown some <br /> x of the 4 vent lines. <br /> - f <br /> �4 <br />