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ENVIRONMENTAL HEALTH DIVISIOL v' <br /> 304 E. Weber Ave. Third Floor <br /> R O. Box 388, Stoc ton CA 95201-0388 <br /> Approved gr <br /> Denied El <br /> O/Conditions—SEa CnI14A4 -,?a 6aa j <br /> Date 3 12 -18 by &,-1 . eoj,� <br /> I . (LrmeAiA-1'i6i..) P¢oPD5Ai�5 / a <br /> SHAIJ- hE 906TeNQQ UNDUI � � <br /> 56iL � G2olJwwp� pLUM65 <br /> i rHe 'nnta`rr/else- 4 , gERtT- <br /> L)Ab l ,sroc)36 . EYcujUE VIMI January 15, 1998 PAYMENT <br /> 94373 pF^�nrr <br /> rjQ(1A. G I/ 61AL POOL K) 707 TME. JAN 16 1998 <br /> 2• rf Z1u � ��" Wmti Ms.MarYMeaYs w$aFuNc.,ONFf.:UIN <br /> swas <br /> aoNMamFr HF n wu.a. <br /> San Joaquin County <br /> ly wnEkfivi �MfIAk'y Environmental Health Division <br /> P.O.Box 388 <br /> Stockton,California 95201-0388 <br /> Subject: Addendum to Workplan for Subsurface Investigation at Former Thiemann's <br /> ,,,,,,� Service, 106 West Second Street,Ripon,California <br /> 3. flPIVIW9r1l I� L1BflA � Dear Ms.Meays: <br /> TU 106wt, Eke fti� Smith Technology Corporation(acquired by ATC Associates)has prepared this second workplan <br /> m!/ � AJC—) <br /> addendum to Smith Technology's WorAplan for Submrface Investigation, dated May 3, 1996, <br /> V[K L( and Smith Technology's first Addendum to WorAplan for Subsurface I waigalion, dated May <br /> D 15, 1996. This addendum addresses the changes in scope of work suggested in PHS/EHD <br /> .ts�fffl-mEt•L 7 .1L,1•�r7 I Tp correspondence dated October 16,1997. <br /> l,JQr 1'r L ��' AA 1 MtgWy I The revised scope of work will include advancing one soil boring to approximately 60 feet below <br /> ground surface(bgs)and analyzing soil and groundwater samples collected during the installation <br /> I ftL/ ttif D7.�Ge2l. �( C(jl,J� tA/ ( of the vapor extraction wells and air Sparge wells for oxygenate fuel additives. In addition, <br /> ` TSiL131��1bN - I nl existing groundwater monitoring wells MW-1, MW-2, MW4, and MW-5 will be sampled for <br /> D I'lfly [totsc. oxygenate fuel additives by EPA method 8260 during the next quarterly monitoring event. Wells <br /> SH�Iti (SG CAAIfI .Jiy ��'� MW-3 and MW-6 were sampled for oxygenate fuel additives during fourth quarter and oxygenate <br /> fuel additives were not detected. <br /> /p If I <br /> pr,,� I T•`I �T��- � b�Z�IC��a• In the Addendum to Workplan for Subsurface Investigation, dated May 3, 1996, Smith <br /> /A IPUA� 5NAU aTAL10� CA01 Technology proposed to advance two onsite air sparge wells, one of them located inside the <br /> 7 // I`l W W^ former tank excavation ro approximately 35 feet bgs. To fully delineate the vertical extent of soil <br /> SI6t,A rl vAAA�W Ln)U u}[I a_ contamination,this soil boring will be advanced until field observations indicate that the soil is no <br /> ,ter, longer impacted by petroleum hydrocarbons, approximately 60 feet bgs. Once the soil <br /> uMT '/ttj} t)�t✓� 0}�5 (=j�t" contamination has been defined,the soil boring will be backfilled with grout until the bottom of <br /> • �Ti..� the boring is at approximately 37 feet bgs. The grout will be allowed to set overnight and two <br /> 5M Pj C-14 P tom•' Nez <br /> 6b -}b ry feet of bentonite will be placed on top of the grout. The air sparge well will then be completed as <br /> originally specified. <br /> �� g V�I r�itS`llfii C/ aNJ <br /> 13y1CrapnP..:w5namw=Cr 1 <br /> `1 aiu lSrive MONso.CA"351 5 02 IYAI 5]9-3221 . Fu lEW1859-FESS <br /> Q . R—sruw - Covry <br /> Um P�rE� a sI ( mFl St 3 af(Si � <br /> /��'-viiva'� D-�s�tlh�lJt� 6� i�'t�26uRQ�iOtf� <br /> 5• "/UhMlf ��IUf�lurih � �+�� 6f�Sd'�% <br />