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<br /> .: CLEARWA,T.E
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<br /> Assuming the water' 'table his, eric 'uiit r d
<br /> rr 1 o, e e "at '45 feet felow grade;,'Clearwater
<br /> } •!' r ,; ariticpatea' drilling'the':borings 'to .total, depths of, 55 ;feet,below g'r'ade.:`' Tlie, boring
<br /> r ,
<br /> ,'locations' are selected: to'provide some-lateral' definition'of hydrocarboris.in ther.soil
<br /> If allowed by physical'constraints'(utilities etc:}; twol wells 'will be 'located ' one;at
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<br /> ;t'lea'st 0 feet from the;£oi`mer 'tank area 'in the,anticipated 'downgradi6n' i direction ". , r•,?
<br /> from#"the 'fuel and used Foil'UST''.eavities: A' two inch'inside r diameter. splitspoon "' ;�
<br /> ' ''s ler 'lined with'bra"s
<br /> ainp s tubes;,will,be used to collecf soil samples.at five-foot depth
<br /> iriteiVals in two 'borings. One boring will be,`continuously cored,iii-order,to 'provide
<br /> adetailed 'ev'aluation of'subsurface lithology.
<br /> Portons'of each soil sample will be retained 'for a visual lithologic,description;rby a
<br /> Clearwater 'geologist using the Unified So1I''Classification System; and for.•volatile; F '
<br /> orga"nic'heads'pace''analysis 'usirt a hoto-ionization 'detector PID' PID''readirigs
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<br /> "will,'be;.used'to help.'select soil. samples. for, laboratory,.ana ysis:and, will, be'recorde'd'
<br /> on tli'e.well,l6gs..',Soi1"cuttings genErated f�rom''drilling wiill be wyrapped'in 'plastic and
<br /> siored,bh-site -pending•fuiture removal: I, "' L
<br /> arEd ,disposal' by 'a licensed-•waste hauler •• ! � ,, • r"
<br /> Soii'samp.. swill be collected,.into brass tubes by hand at five,foot'+intervals from the
<br /> contizious core:' Soil samples collected''for; analysis will' be labeled;',documented' on, a"`
<br /> cliain-cif-custody form; .and placed' in' a',cooler for transport to PACE.Inc., :a°:State
<br /> .certified 'environmental laboratory,,located'-in Novato; 'California: F&ur"so'il-saimples
<br /> .'fronl each soil boring will be'analy'zed for:' TPHg by°EPA Method 8015; 'TPHd•by;E'PA ^`
<br /> Method 8015; and, benzene, toIuene;, e' thylbenzene, -arid total xylenes (BTEX) bye EFTA i
<br /> 1Vle-hod 8020.
<br /> 2.,2' ,Mont#ori'ng•,Well Insfallation, Developm'e'nt and Survey' . :1 y
<br /> ,two=inch'd'iainetei monitoring well will. be.,-install' d&in each boring:
<br /> �I ,will\be°,constructed of• Schedule'40'PVC,• And, will,consi'st f .1 f
<br /> ... . ,`0 5 eet;;of, 0.420 inc11
<br /> ` slotted•'wel. screen ai`the'base of the'well flush th`reade'd to''forty-feet of_blank PVC
<br /> r. ris'e'r:extending-to''tfie surface(Flgure 3}.',' S1licafsand' filter pack will be.placed;.arounci� " 'y f ��
<br /> 'the r L , ,,, ,. . .. , ,+,. � '
<br /> screen,toy a' depth o f 38 feet below,.•giader' A one-foot thick,bentonite;seal will`be ,•'#
<br /> 1 laced •aboveL the filter,• ack: Ther remaining`.'well• annul'u w
<br /> `P p s. ill be. filled, w-ith �' '+,j
<br /> Portland ceinen't The wells will',be ,fitted,,rwith''locking expansion caps 'and :t
<br /> rf' completed at''gr'ade in ;traffic- rated manhole`�'box'es, The monitorin wells'�.will.be r
<br /> t4j developed 'by; a terriatin'g surging' and bailing If°pos'silile ten"wetted -well. casing' �� 3
<br /> wbiui es ,will,,;be%',-iemoved�,d'uring development '=of each well:!-, Top of casing
<br /> s , elevation fo'rr each well', will b'e;surve'yed to'a.'temporary,benchmark''established,at` ' L1
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