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r"y..40.1177 e:=�4h II im h'C_F11` .L1'K:2 HL111111 11".1I t'.Z;/11 <br /> A41G,705' 97ME) 16:47 UNOCAL Vr.wNORTH RR TiSi1;514 277 "q r, uus <br /> June 13, 1997 <br /> Pip 4 <br /> wells(VW-1 through VW-3)screened in the 9-to 53-fbat depth interval.. The syMan <br /> was aucomsful in removing remmining hydrarazbons in Ow vadose zoine, Approximately <br /> 2.745 pounds of IoW purgcable petroleum hydxwarbons(TPPH)and)2 pounds of <br /> _. berate were removed. . <br /> Currleot Site Steens. SJCEFID las detem irlcd khat the both wit and VM"dWx r <br /> asmessmottt has been coarplacd and the plume appears stable(Attachment B). All <br /> protr>apatly hydroearbo* iMac N d soli has beep rather removed by excavation or reme- <br /> diated through SVE. No SM has ewer been detected in any Monitoring wells. The <br /> remaining dissolved-phsae:plume is caneentrated in the nastern portlon of the site. Mr. <br /> site rrigr4oin is appar+eWy limited to less than 100 fea(Figure GS). <br /> In theirteftr dated January 9. 1997, MCUM requested additiorW in�ti=regard <br /> irtg rhe pat d+l'#br mural at c- vf'hydrombans. Spec ilcall3r <br /> • Dum on the presence ofbydrocarbon deg wft bacteria, oxygen, or <br /> other available electron acceptors, nitrogen,phosphorous,potas:.ium <br /> values., sail porashy, and organic embaa content <br /> e A murv+ey of wells wi t 7,0(30 feet of the site and nearby pathways <br /> Mich as basememts and amTrty he tr+m c*. <br /> A 1amMity study and corrective acdon plant. <br /> ! <br /> Continued quarterly monitoring. <br /> In t h=t dated February 7, 1997, Unocal respandad 1but this site poses no threat to <br /> human health acrd safety or the eavimrnmem mod that further aw-unnent and active <br /> =ffw ive a don was smwar=Ud (Aaachment B). Unocal concluded that the site was <br /> suitable for clamro as a low-risk Sn=dwater,rase, In a letw dated March 3. 1497, <br /> SJCEI-ID denied Unocal's mue st for site closure(Attachment B). <br /> EVALUATION OF SITE FOR CLOSURE(1.G,) <br /> PACIFIC requests 9W the Fmd Manager consider The fr}llowipg=,ertt site =AWons <br /> Whim evaluating the site's el Withy for cloacae. <br /> • Shallow Impacted sad identified at dee:site has bean remediated pia <br /> excavation"soil vapor enmu6c t. Thus, soil poWdaliy sanrrawd <br /> with petmleum in the irnrnedtates AcWty of the former source(s)has <br /> apparently been removed or remediatcd. <br /> • The health risk due to ingrs6on.or dermal contact with soil affiewd by <br /> the:disdwMe is r eamnably abated, since the"aw hydroenrNm- <br /> itrtpacwd sort has been excavated, <br /> �s <br />