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JAN. 8, 2007 1 .4M WARD REAL ESTATE $79-7213 NO. 396 P. <br /> PUBLIC HEALTH SERVICES <br /> SAIN JOAQUIN COUNTY <br /> ENVIRON MENTAI. HEALTH DIVISION <br /> w y, r■ <br /> Muen lvtmt,XD., A X.K, ]with Officer <br /> $04 last Weber Avenue, TWrd ,Hour k Stockton, CA 95202 <br /> UNOCAL CORP FEB 2 a lose <br /> 8013 BOUST <br /> 2121 N CALIFORNIA BLVD STE 250 <br /> WALNUT CREEK CA W98 <br /> RE: former Unocal#0123 SITE CODE: 505098 <br /> 1 034 Central Ave. <br /> Tracy, OX, 95376 <br /> San Joaquin County Public Hazith Servicas, Environmental Health Division <br /> (PHMB HD) hae raeorttiy received two phony 1nquides concerning future <br /> requirements from PHS-EHD for this site. Fdr clarification,the fallowing <br /> recommendations are offered, <br /> The delineation of contamination In the soil and groundwater both laterally and <br /> vertically is required. Subsurface data from soil arid groundwater samples <br /> should provicia Information that will allow the site to be aasessed for the extent of <br /> contaminated meas, the average concentration of petraleurn Impacted salt, and a <br /> detarminstlan it the soil has completed its"loading" to the groundwater or ' <br /> whather it can be Weoted to ocntlnus to increaae its impact to the gmuridwater. <br /> IdertifWorl of all wells wi hln a 2000 toot radius of this Sita must ba,corhpleted. <br /> Further assessment in the area of the fOrmar waSW ail tank is needed. Solvent <br /> contamina*m from the waste oil tok appears to exist in rttonjoring well #U-3 <br /> and a lateral and vertical plume determination Is required, Additionally, high <br /> levels of gasoline have been detected In the newest monitoring wall (#U-s] and <br /> furthar down-gradlent irivestlg4on is requlmd, <br /> QhOi the site has bean fully amassed and fewlblllty testing dompleted, a <br /> Corrective Action Flan (CAP) is to be submitted to PHS,EHQ that address <br /> remadial methods and evaluates at least two altema vom for cost-effectiveness, <br /> This CAP is to include the casts and time Mme estimates needed to retum the <br /> groundwater to it's designated"heneflelai use,. Once approved by PHS-EMD, <br /> the Corrective Action Plan Is submitted to the SWIs Water Resotrtoas Control <br /> aoarcl (SWROB), Clean Up f=und (CUFD for pre•appmval of c+asta. <br /> lPc"'brand tax trangrrn`dal memo 7671 #at"• 2 <br /> wa Fan 0 .� <br /> am. <br /> A Oi�;i�+a78ari �e <br /> 1plr�n �ouney'l•TCs a ��e SdivlrFa <br />