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07 July 2000 <br /> AGE-NC Project No 98-0448 <br />' Page 9 of 12 <br /> rate will be determined from the measured differential pressure and the piping diameter using a <br />' nomograph(Appendix A) The air stream will be monitored for the presence of organic vapor using <br /> an organic vapor analyzer (OVA) e4uipped with a photo-ionization detector (PID Thermo <br />' Environmental 580A, 10 0 eV, calibrated to isobutylene) Sampling ports will be installed upstream <br /> the vacuum blower inlet to recover Influent soil gas stream samples, and downstream of both carbon <br /> canisters to recover effluent stream samples to monitor the efficiency of hydrocarbon filtration <br /> 4 2 1 Soil Vapor Extraction Well Installation <br />' Installation of an additional three SVE wells is proposed utilizing a limited access truck-mounted <br /> drill rig equipped with 8-inch diameter hollow stern augers Hollow steric augers will be cleaned prior <br />'. to advancement in each borehole The SVE wells will be advanced to depths of approximately 20 <br /> feet bsg The SVE wells will be completed with 2-inch diameter, schedule 40 PVC well casing <br />' emplaced through the hollow stem augers Each SVE well will utilize fifteen feet of slotted well <br /> casing (0 020-inch screen size) from 10 to 25 feet bsg A #3 Lonestar Lapis Luster sand will be <br /> poured down the annulus between the well casing and the inner wall of the hollow stem auger The <br /> filter pack will be placed adjacent to the screen from the bottom of the boring to a point <br /> approximately 2 feet above the top of the screen A three foot interval of bentonite pellets (annular <br /> seal)will be placed above the filter pack Portland cement will be utilized to grout from the annular <br />' seal to surface grade A SVE well construction diagram is depicted in Figure 6 <br /> 4 2 2 Soil Vapor Extraction Piping System <br /> A network of two-Inch diameter, schedule 80 PVC piping will be Installed in a series of trenches <br />' approximately 6-Inch wide and 12-Inches deep The PVC piping will be routed from each SVE well <br /> head to a water vapor dropout drum, the water vapor dropout drum will be directly connected to the <br /> vacuum blower A PVC ball valve will be installed at each SVE well head so that vapors can be <br />' drawn from each well independently or a combination of specific wells A plan of the proposed <br /> piping system and enclosed unit location are depicted in Figure 5 <br /> The location of the vacuum blower unit is proposed near the southwest corner of the warehouse <br /> building structure at the site(Figure 5) This proposed location of the vacuum blower will allow the <br /> Sierra Lumber facility to conduct their+day to day business without interference from the operation <br />' of the remediation system The vacuum'blower unit will be secured by a chain-linked, gated <br /> enclosure approximately 10 feet wide,I1 feet long and seven feet high <br /> Electricity is readily available to the site A dedicated electrical meter will be installed by <br /> representatives of P G & E .that will connect directly to the vacuum blower unit <br /> 4 <br /> Advanced GeoEnvironmental,Inc <br />