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30 December 1998 • AGE-NC Project No 95-0173 Page 9 of 12 I hollow stem augers Each SVE well will utilize fifteen feet of slotted well casing (0 020-inch screen size) from 10 to 25 feet bsg A 43 Lonestar Lapis Luster sand will be poured down the annulus between the well casing and the inner wall of the hollow stem auger The filter pack will be placed adjacent to the screen from the bottom of the boring to a point approximately 2 feet above the top of the screen A three foot interval of bentonite pellets (annular seal) will be placed above the filter pack Portland cement will be utilized to grout from the annular seal to surface grade A SVE well construction diagram is depicted in Figure 7 4 2 2 Soil Vapor Extraction Piping System ' A network of two-inch diameter, schedule 40 PVC piping will be installed in 5-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 vapors can be drawn from each well independently A plan of the proposed piping system and enclosed VES unit location are depicted in Figure 5 The location of the VES unit is proposed near the southwest corner at the site (Figure 5) This ' proposed location of the VES unit will allow neighboring properties to conduct their day to day business without interference from the operation of the VES unit The VES unit will be secured by ' a chain-linked, gated enclosure with measurements 15 feet wide by 20 feet long and six feet in height ' 4 2 3 Soil Vapor Extraction Supplemental Fuel ' Supplemental fuel`(patural gas)is/proposed for the operation of the selected VES 7oxygen :mieter ` air dilution module adjusts for the optimal combustion parameters by addi supplemental fuel Natural gas is readily available to the site A dedicated naturalcould be installed by_representatives of P G & E that would connect directly to the VE w 4 2 4 Son Vapor Extraction lvlonnoring ACiiviies ' The VES unit will be monitored weekly using a photo-ionization detector(PID) and Dwyer DS-200 flQw sensor to ensure optimal destruction of recovered hydrocarbon vapors, and to monitor cleanup progress The PTD readings will be recorded from the influent end of the VES unit, and recorded before and after catalytic destruction Operational parameters (air flow, combustion temperature, volume of processed vapor, oxygen level and the lower explosive limits) will be measured on a weekly basis to ensure optimal destruction of recovered hydrocarbon vapors I Advanced GeoEmwonmental,inc