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r d }' RIMM VfISS u TE$ K4 Julian Munoz 10 15 October 1987 Monitorin Well Installation hey were y A Well locations are shown on Figure 2. Twere constructednwibh 4Win.aID approved by the SJLIiD. The monitoring wellsprotected Schedule 40 factory-threaded PVC screen afficoratedcasing, manholesandwwere wells were sealed by locking well caps and at-grade tr from surface infiltration with a 1-1/2 ft thick bentonite plug and cement/sand grout. Monitoring well MW-1 is located approximately 12 ft east o€ the tank pit ound surface. Monitoring excavation and is screened from 25 to 34 £t below gr well MW-2 is approx •jately 15 ft north of the tank pit and is screened from 23 to 33 ft. well MW-3, screened from 25 to 35 ft, is located approximately 19 ft southwest of the excavation. Monitoring wells were screened to monitor ground water in the water-bearing zone found between 24 and 33 ft below ground surface. No water-bearing materials were found obent s24 ignificant laterally extensive migrationrd ial ft, To avoid creating a conduit €or the downwa wereonotpextended hydrocarbons from soils near the water table, well screens to the unsaturated zone. Well Develo ment Wells MW-I, MW-2 and MW-3 were developed and sampled on 25 August 1967. Wells MW-1 and Mu-2 p were developed using a combination of pumping with a submersible pump, surge blocking and bailing. MW-3 was developed with a submersible pump and surge blocking. The submersible pump was fitted with a the check valve to prevent backflushing of agitated water was steam-cleaned well use pump was turned off. The development equipment tilled and was thoroughly rinsed with tap water umes ofsdevelopmentPwatertween wells. were removed Approximately 150 gallons {ln well volumes) ----------- --------- MW-2 and 460 from-Kw--1,-260_gallons (25 well volumes) were reomved from gallons (47 well volumes) were removed from MW-3.