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WELL INSTALLATION WORKPLAN PERMITTING AND NOTIFICATIONS Upon approval of this workplan, obtain all necessary permits for well installations, encroachments, traffic safety control, construction of pump and treatment system compound and trenching/manifolding of treatment compound to excavation well. At least, a 48-hour notice will be given to all concern parties prior to start of any site activities. UNDERGROUND SERVICE ALERT NOTIFICATION All trenching and well installation areas will be marked in white paint and labeled for notification to Underground Service Alert(USA). Notification to USA will be initiated one week prior to any drilling/excavating activities and only after obtaining all necessary permits required to perform the necessary work. HEALTH AND SAFETY PLAN A site/job specific Health and Safety Plan will be developed for the drilling, trenching, compound construction work and will be on site for review and reference during job activities pertaining to this workplan. WELL INSTALLATIONS FOUR - INCH EXCAVATION/GROUNDWATER RECOVERY WELL N The 4 inch diameter excavation/groundwater recovery well will be drilled into the backfilled excavation through the previously installed traffic box (placed for this purpose), see Figure 3. This well will be drilled with 10 inch hollow stem augers through the pea gravel backfill three feet into native formation, approximately 33 feet below the surface. A soil sample will be obtained at the termination of the boring for analysis of Total Petroleum Hydrocarbons as gasoline, Benzene, Toluene,Ethyl Benzene, Xylenes and MtBE. The casing will be 4 inch threaded schedule 40 PVC. Slots from 33 to 27.5 will be 0.01 and from 27.5 to 7.5 feet will be 0.06 with blank casing to the surface. Number 2/12 sand will be used as the filter pack across the 0.01 inch screen. The well D will then be surged to stabilize the sand pack and if necessary more #2/12 sand will be added. The M pea gravel removed during drilling will be re-installed opposite and 6 inches above the 0.06 slot. The well will be surged to stabilize the sand and gravel pack and if necessary more gravel will be added. Two feet of hydrated bentonite will then be used above the gravel as a sanitary seal. Neat cement with less than 5% bentonite will be placed on top of the bentonite seal to the base of the traffic vault. A two inch thick cement/sand floor will be placed at the vault floor, leaving 22 inches of the casing exposed within the vault, see Figure 4 for well construction details. A locking thermos type well cap will be placed at the casing top to secure the monitor well. 4 Sanchez WORKPLAN 9-03