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Sent"By: RWOCR; P + 2553439; ' Oct 3 O(' 7:24AM; Page 2 <br /> 05/09/2000 02.36 FAX R01 <br /> rA <br /> Ii1A'l01�tMt'AL <br /> 4d4R SfiraMr: <br /> rr <br /> • 1 <br /> PbOrus.pon •lam•: <br /> Ii""o�i" ;ice���i�•, ,-, - - .. .. - <br /> i <br /> OotQbBr 02, 2M <br /> I� 14 a ty flartzell.AEG <br /> N CVR%%=B <br /> 3443 Routier Roan (916)256.3116 Phone <br /> Surantento, CA 93827-3098 (916)285-3439 FAX <br /> 4 <br /> SUBJECT: WORKPLAN FOR A SUBSURFACE INVFSTWAMN TO'Dem THE LATERAL EXTENT OF <br /> myoRocAR9oN Comswrww s w GRour nWATfaR AnomTED wrM TM FORWR <br /> t UNDERwom STMAff TAMM (UST14 'AT T114111aRtOm�R TOM AND COUNI7ZY <br /> m <br /> i CWWRON WM LOCATED a i M� i WOW e8.LA&A&rd,CalMornta <br /> Dear W. Hartzell: <br /> s <br /> The ptfrpase of this technical report Is to aaNirwi ther�proeem by which three (3) <br /> temporary groundwater monitoring wells will be irstatled and sampled al the subied <br /> site.Tho pe oposod groundwater monitoring walls aro intended to provide groundwater <br /> gradient flaw and direction data as well as dissolved hydrocarbon concentration data <br /> to old ire dmin ining if the remaining shallow soil contaminatlon beneath tate site <br /> could impact nearby wade supply wells. <br /> The lost activity on the site entailed eraravallon of one soli boring to the groundwater <br /> table through the comer of the gawflne plume In sail far the purpose of obtaining a <br /> resents sd la�oraitory analysis identNhd d ppb benzene arab sample.The re -rP <br /> in the groundwater. Excavation through contanbiated!soil is problematic from the C? <br /> perr�diw of obtaining a groundwater gra sample E ler dud the d"um of woes <br /> coir wWnatlon of the bailer used for water sampling hi;higher- In order to a sh Mish <br /> whether or not the groundwater is etelualmy contaminated from sire :.e:ondary <br /> contaminated soil source,throe similar cell boringswlll Eli drilled outside the perimeter <br /> of the soil plume for the purpose of obtalnin9 -moor loves dada to establish 0 <br /> groundwater grad om Harr direction and dl solvol l gasoline aonrat7tuents In <br /> groundwater,if present.fade of the three(2)soil borings will be a <br /> of approximately 120 feat bgs(Le.at least 20 ory paled water table) f5� <br /> and each will recelve a 90 feet of blank ate felt . . 4o to 120 feet bgs)of 2 inch- <br /> taVC so�rned ceasing, After the three tempo reundwater monhorhrg wells ham <br /> receive'a sand pack and a bentonite seal,theywill!ie preperh purged,developed,and <br /> sampled.The water samples will be SAW N id to a State certiAed laboratrrry an a 24 <br /> hour turn-around. If related are i the <br /> t preundwatear sa�m pleas ro roundw+oler monitoring weds will <br /> se undwater mon rig wells to MtMHsh GOWOIWW— <br /> ;;;;;i <br /> na co ent trends through time. rarery ane does not <br /> 1Q022m Gensaly, LLC invesJfget7an Workplan far Nunan Pulte 1 of 8 <br />