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SENT HV:A9uaGeoscience Inc. : 7-26-93 'i0:0iAM 1 8053261129-3 `-`- 'a-•^ " GnwndYrater MorNtoAno Wel Inetdtstion r��X 2 tisk( After drilling to approximately 45 fest. 25 fleet of 0.02"0.10. and 20 feet of blank screed . schedule 40 PVC casing will be installed through the augers. The 25 feet of screen will allow for monitoring at the "rant groundwater depth as well as the hidoftW high groundwater level. Flow pads send, consisting of 3112 Motderay Sand,will be placed by tremle pipe while slowly rotes and removing the augers I"I"at a time. The fiNrr pack will extend three feat above the highest skrited ht mal A weighted sleet tape win be used to measure the depth to the titter pack sus well as dalarmins whether bridging' Is occurring. l3entonRe (" Inch) pellets will be placed on lop of the MW pack such that a minimum three foot 801011 is dMained. The pellets will be hydrated with dean potable water and allowed to set a mirdmum of one hour. A neat bentonite (lees than 5%)cement slurry will be placed on top of the After pack and extend six inches above surface grade. A Wing,trafNaruded, Wing well emrar will comPleta the installation. The final elevations will be surveyed from the north side top of casing (C O.C.). The County will be given 48 hours notice to witness the well completions. Enclosed for your evIew Ie a mordt dng WON GOMMtctloe dlegreun (Exhibit 1). i Groundwater Monitoring Wil Development After allowing 24 hours for the cement to cure, a stainless steel submersible pump will be used to develop the wells. Water will be pumped until the "fluent contains less than 10%fine ne matadais(or urd the effluent is dear)- The water willbe stored In appropriate D.O.T. approved 55-011on drums pendirr� receipt of analytical results. Groundwseer Marko fig V40 Purging Forty eight hours after development(to allow the agA*r to retum to equsllodum) a bladder pump will be used to purge a minimum of foul well volume& well volumes will to calculated by measuring the depth to the top of the water and subtracting from the tote!depth of the well. This"tiddkness"will to multiplied by x rQ tD obtain the 'Wren volume". After a minhnum of four wan volumes have been removed,the parem stem of pH, temperature and conductivity will be measured. The aquifer will be aonaidersd atabiib ed If three consecutive nte9suremems are within 10%of previous m9astnernorft Groundwalef SO PIN CoINQM M Upon completion of purging.the walls will be sample ding usa disposable PVC bailer. The baler will be lowered Into the well to collect a sample of the weir. Groundwater samples will be stored in 40-ndtii W VOA Vials and These containers on baerlt a such that nmber �r� IMM a Stets Carried Mboralor� haadapaoa exists and rte samples will be stored in pecking material and placed In an Wed molar at 40 centigrade or less. The samplae win be immedately logged on to a drain af-ouslody document. I