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• 23 Apri12002 AGE-NC Project No 95-0142 Page 15 of 16 4 6 1 Soil Vapor Extraction Piping System I A network of two-inch diameter,schedule 40 PVC piping will be installed in 6-inch wide by 12-inch deep trenches at the site The PVC piping will be routed from each SVE well head to a vapor dropout drum, the vapor dropout drum will be directly connected to the VES A PVC ball valve will be installed at each SVE well head so that vapor can be drawn from each well independently A plan of the proposed piping system and enclosed VES unit location are depicted in Figure 4a The proposed location of the VES unit is near the southeast corner at the site,immediately adjacent ' to the ground water extraction system, this equipment location will allow the site occupant to conduct their day to day business without interference from the operation of the VES as well as the ground water extraction units The VES unit will be secured within the same chain-linked, gated enclosure as the ground water extraction unit 4 6 2 Soil Vapor Extraction Monitoring Activities During the"start-up"period for the SVE system,organic vapor and operational parameters(air flow, • combustion temperature, volume of processed vapor, oxygen level and the lower explosive limits) will be monitored on a daily basis The anticipated start-up period will be approximately one week tAfter the one-week start-up period, the VES unit will be monitored weekly to monitor cleanup progress, using a photo-ionization detector (PID) on a Model 580A organic vapor meter(Thermo Environmental Instruments Inc ) to document destruction of recovered hydrocarbon vapors and a Dwyer DS-200 flow sensor to measure flow The PID readings will be recorded at the influent point and effluent point of the VES unit (Figure 4b) Operational parameters (air flow, combustion temperature, volume of processed vapor, oxygen level and the lower explosive limits)will also be measured on a weekly basis to ensure optimal destruction of recovered hydrocarbon vapors Vapor samples will be collected on a monthly basis from the influent and effluent points of the VES utilizing the vacuum pump(Figure 4b) The samples will be collected in Tedlar bags and transported in a chilled container under chain-of-custody procedure to a DHS-certified laboratory for analysis 4 6 3 Progress/Confirmation Soil Sampling ' After approximately six months of operation or,when efficibncy of the unit has declined or vapor pP Y recovery has become asymptotic, soil samples will be collected from the "core" petroleum ' hydrocarbon Impacted area Analytical results of the soil samples will serve to approximate • remaining petroleum hydrocarbon levels and determine if continuing remedial operation is necessary ' Advanced GeoEnvironmentab Inc