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h UnocalLporation <br /> Diversifi6d Businesses <br /> 2000 Cr6w Canyon Place,Suite 400 <br /> San Ramon,California 94583 <br /> Telephone(510)867-0760 <br /> Facsimile(510)277-2303 <br /> uN�CAL O RECEI V E <br /> JAS! 311996 <br /> S <br /> ` :NVIRONME.NlAL HEALTH <br /> January 25, 1996 <br /> PERMIT j SERVICES <br /> Northern Region <br /> Corporate Environmental Mr.Michael Infurna <br /> Remediation and Technology I <br /> San Joaquin County Public Health Services <br /> EnviJJronmental Health Division E. <br /> 304 Weber Avenue <br /> P.O.Box 388 <br /> Stockton, California 95201-0388 <br /> I <br /> Former Unocal Service Station 0123 <br /> I <br /> 1034 Central Avenue at 11th Street <br /> Tracy,California <br /> Dear Mr.Infurna: f <br /> As requested in your review letter dated December 26, 1995,this letter serves to notify you of the status <br /> of on-going environmental investigations for the former Unocal site referenced above. Unocal's status <br /> of investigations and proposal for proper abandonment of the two underground storage tanks(USTs) <br /> located beneath the Eleventh Street sidewalk are presented below. <br /> Status of Site Assessment Activities <br /> Analyses of groundwater samples collected during the see)nd and third quarters of 1995 identified the i <br /> I I <br /> presence of dissolved-phase petroleum hydrocarbons in Monitoring Wells U-1 and U-2,while <br /> groundwater samples collected in the fourth quarter 1995(contained no detectable hydrocarbons. Given <br /> the attenuating trend in hydrocarbon concentrations currently noted in site wells,it is Unocal's opinion <br /> that additional groundwater monitoring is necessary,prior'to determining if additional on-site or off-site <br /> investigations are warranted. Unocal will submit status reports quarterly to interpret groundwater <br /> monitoring data and provide proposals for continuing next phase investigations.,if appropriate. <br /> Status of UST Abandonment <br /> i <br /> I <br /> As you know Unocal's site consultant,Pacific Environmel tal Group Inc.,has been in contact with Mr. <br /> Mark Thrailkill of the City of Tracy,Public Works Department(the City)and yourself, since July of <br /> 1995 regarding proper abandonment procedures for the USTs. On January 18, 1996 you spoke with Joe <br /> Muzzio of PACEFIC and indicated that you had discussed the UST issue with the City and offered three <br /> options for UST closure: (1)Remove the USTs by conventional methods requiring sidewalk opening;(2) <br />