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Sent'By: RWOCB; 4 ...�.. _, 2553439; Oct-3-Or' 7:26AM; Page 7112 <br /> 05/08/2000 02:36 FAX Q06 <br /> 10-02,"N GeaSo1v, LLC lnwsii inn Work�on for Nunan _ 6 of a <br /> 4.0 Matl+ed of Tomporwy Well Construction <br /> Each sell baring will be excavated with an eight($)I Inch hollow-Alam auger drill to a <br /> depth af,appro3d inarelyr 120 feet bpi(Ste Fnswg 3 Fos AltauMDWATEs MoNrroRwa WoLL <br /> Cotrst Ttva DrwL). A two {2) inch diameter, schodula 40 PVC, 0A2 inch slotted <br /> screened casing will be selected to correspond with the length of the deeper water <br /> production sone below the fine grained soils{i.e.grourEdwatir is eM.cfed at 100 feet <br /> bw and the seroen will be set 10 feet above and 1'20 feet below the potcentiometric <br /> surf mw).,The remaining 700 fest of PVC wHi be blank casing ro the si►rFaee.No.3 Silica <br /> sand will be placed in Nee annular space up to two fe,61 ahoy.the top of tho screen and <br /> a three loot thick bentonite seal wlil be placed ori top'of the sand pads. Bentonite <br /> pal lets will be dropped to the top of the sand pack in sib itch lifts and hydrated through <br /> a trammie pipe until a three foot thick nal is attained. <br /> 5.0 Well Development of Temporary Oroundwerirr MetrMeringf walls <br /> The temporary►Walls will not recalve aHyl prowl and will no't;undergo any additional well <br /> construction procedures union gmundwetar contam ne ion is encountered Water <br /> levels will be measured In the open soil borings until stalilfized.The water levels will <br /> be measured with a Slops Indicator wale#level meter to As nearest 100th of an inch <br /> i4 and will,be tompared to cartified field survey rife e6ce pph is ad;awnl to each <br /> borehole location. <br /> t <br /> Development with a surge Montt by the C-57 llconx4id driller will be performed under <br /> the dlreation of a quallNed florid technician under tfis sv 1 rvislon of a State Certified <br /> Hy►drogeologlst. <br /> Each temi,poraay well will be sampled after purging approi6mately►three(3)to ton(10) <br /> borehole volumes,allowing the water level to r+ecov"or to at least 90%of the original, <br /> static level.The purging will be performed by the use&#a' steel bailer.Temperature, <br />{ electrical condutli�ritT,and pin will be monitored during a 'arh purging,so that the three <br /> pa ometers are within a 10diX.errordiHerancefrom*noon:,other,arerthree consecutive <br /> readings. The data will be used to warily that watsr,had ean removed from that well <br /> casing stowage and that the well water wars representative of die aqu for, prior to <br /> sampling, <br /> 6.6 Groundwater Sampling from T'ewparairy 144lya <br /> Water samples will be co0aded by placing a steel or'phastii disposable baiter down the <br /> confer of the PVC well easing after purging.The biller will be lowered to the bottom <br /> of the will tadag and pulled to the surface to be from the bottom of the <br /> holler byi,temporarily unplugging the cheekvahre unitil wetter flows fry into the glass <br /> semPla cornah er.Water spmpl es will be contained iii 40-e ryfllllitor VOA vials for TP", <br /> BTM and EPA Mathad 0360 analpes.The samplasj wul'be labeled and stored*nice <br /> at 4 eoorwes centlgrado until dellvered on a24 hourturn-around, under dwin-of- <br /> antodyr prarwlaroo, to MtCampholl Analytical, Inc: of ftchaco, Calltarnla, a State- <br /> certifiied;analy"caei laboratory. All sknmples will lie ahalyr by appropriate and <br /> i appllcdble EpA test methods. ; <br /> 3 <br /> 10.02.2000 OaoSoly, LLC invesuganan Workplan far NLInOn Pape 6 of a <br /> s <br />