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25 March 2009 AGE-NC Project No. 95-0121 Page 6 of 9 4. 1 . PERMITTING An application for a site-specific air permit will be submitted to the SJVAPCD prior to initiation of the remediation project. Upon receipt of the SJVAPCD Authority to Construct (ATC), the system will be scheduled for installation. In addition, a permit will be obtained from the City of Stockton Department Municipal Utilities to discharge treated ground water into the City's sanitary sewer sewage conveyance system. Any additional permitting for construction work, including electrical and plumbing source installations, if required, will be obtained. 4.2. REMEDIATION SYSTEM PIPING NETWORK A manifold network of one-inch diameter, high-density/high-pressure industrial tubing will be installed from the proposed remediation well network in a series of trenches, approximately 1 .5 feet wide and 1 .5 feet deep. Additionally, four-inch diameter, schedule 40 PVC conduit will be inserted over the 1 -inch piping as secondary piping containment. All remediation tubing will be routed underground from each wellhead (EW4 , VW- 1 and AW- 1), to the DPE liquid-ring blower, located inside the remediation system fenced enclosure (Figure 4). A PVC ball valve will be installed at each well-head location so that vacuum can be adjusted to operate at one well independently, or from a combination of wells. These sampling ports will allow sampling of wells independently without having to remove the well head assembly. Following piping placement, the trench will be backfilled with imported road-base sand, compacted and covered with the native soil removed during excavation. A cut view drawing of the process piping layout is included as Figure 5. 4.3 . DUAL PHASE VAPOR EXTRACTION SYSTEM DESIGN AGE proposes to initiate operation of a DPE system in the core area of the petroleum hydrocarbon impacted area in the vicinity of the former UST area. The DPE system will be plumbed to each proposed extraction well (EW-I , VW-1 and AW-1), which will have the capability to independently control the number of wells being utilized for extraction providing the flexibility to achieve maximum drawn-down to further enhance contaminant removal. In general, one to two extraction wells will be utilized to remove free-phase, aqueous and potentially vapor phases. The majority of the effort will be place on wells EW- I and VW- which are located in the core area of the plume. As field and laboratory data reveals concentration declines, well configurations can be modified to allow for rebound, and/or removal from adjacent wells. Further augmentation of the extraction system and well network may be warranted if laboratory reporting limits reveal significant declines in hydrocarbon concentrations in the "core" area. The proposed wells to be utilized for DPE extraction are depicted in Figure 4. Advanced Gcorovironmental, Inc.