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Stantec Work Plan for Vapor ProbeDestruction, Well Destruction, and Well Installation ARCO Service Station No. 2186 October 14, 2008 identify the location of any utilities in the area. USA will be'notified to identify any public utility alignments that may be in conflict with the proposed borings: In conjunction with the USA, 811 will be notified at least 48 hours in advance of drilling,to-allow the local underground utility companies to identify the location of any utilities in the area. The new 811 number is a national"Call Before You Dig" phone number designated by the FCC to eliminate the confusion of multiple"Call Before You Dig"numbers. 811 calls will be directed to the local One Call Center and the affected utilities,who will then mark underground lines. In conjunction with USA and 811; a private utility locating company will be utilized for clearing proposed soil boring locations for underground utilities'7"w-a' 2.2 Soil Vapor Probe Destruction The destruction of soil vapor probes VP-1 through VP-3 ill be supervised by Stratus. A licensed drilling company will complete the soil.,vapor probed truction work following"thi-e4California Well Standards bulletin.74.;90 Part Ill,�Section,19 an 23 ,Well constructiondetails are summarized ins Table 1.and soil boring logs are included as Attac ment �l .,._. / IIA - A#ria rvE" Soil vapor probes VP-1 through VP-3 will-be-pressure grouted from total depth to approximately.�hd- ground"surface using neat cement. Groundwater expelled from the wells during the grouting process will be.properly contained,.characterized,"and disposed. The former soil vapor probes will-) be capped with appropHate._material-s to-match existing grade. �"--= �► - 23 Well.Destruction The destruction of wells MW-1 and MW-3 will be supervised by Stratus. A licensed drilling company will complete the well destruction work following the California Well_Standards bulletin 74-90 Part 111, Section 19 and23. ` .. Wells MW-1 and MW-3 will be destroyed by-removJJi�ll oft well contents via over-drilling the 35� boreholes to total depth, the n'backfiIling the.bar€holes to three.ft bgs-with.,neat._cement using'a treinie-pipe system forming k�-mushroom g ut ca_ rface seal."Groundwater expelled from the wells during the grouting proces`sWilfib pro ontained, characterized,and disposedof..=After the sealing operation,the bbreh61bs`shall be backfilled with clean', native soil.71 a formerwehs will be capped with appropriate materials to matchexi§ting-grade--= 2.4 Soil Boring,Advaneement, Soil Sampling, and Well Installation Three on-site soil boring/groundwater monitoring wells- (MW-1 R, MW-1 D, and MW-3R) are proposed at the approximate locations shown on Figure 2. The locations of the proposed wells may require field modification due to unforeseen conditions such as obstructions or space constraints to accommodate drilling equipment placement, etc. Prior to drilling, all locations will be air-knifed to-al l"five ft bgs: The-soil borings for.MW_1.R.and MW-3R,will be advanced to approximately ft.bg"s_using a drill rig equipped,with-ieight-inch diameter,continuous flight, hollow-stem auger ..th soil boring for-MW-1 D.will.initially be advanced_ to approximately 65 ft bgs using a drill rig equipped with.an eight-inch.diameter,continuous flight, ' hollow-stent auger as'a pilot hole:Afterward,the soil_boring will be advanced to a depth of 65 ft bgs using a drill-rig equipped with-an 18-inch diameter-,continuous flight,hollow-stem auger centered on'' the.eight-inch-pilot hole. An eight an 518 inch diameter, lush-threaded,steel conductor casing will - 7 2186 Work Plan for Vapor Probe Destruction, Well Destruction, and Well Installation.doc 3