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Unocal Corporation s Y y 2000 Crow Canyon Place,u400 San Ramon,California 9458 -`" Telephone(510)867-0706 Facsimile(510)277-2308 UNOCALO September 6, 1994 San Joaquin County Public Health Services Northern Region Environmental Health Division Corporate Environmental Remediation&Technology 445 N. San Joaquin Street P.O. Box 388 Stockton, California 95201-1388 attn: Mr. Michael Collins Site Code No. 505099 1034 Central Avenue Tracy, California Dear Mr. Collins: Union Oil Company of California (dba Unocal) is in receipt of your letter dated August 29, 1994 regarding a request for a Work Plan for the continued investigation of soil and groundwater contamination at the subject site. The purpose of this letter is to confirm our commitment to comply with this request, and to express concern as to how the responsible party (RP) for conducting this investigation was determined. We had earlier received a letter dated July 7, 1994 regarding the same site directed to both Unocal and Wells Fargo Bank. In that letter you identified both Unocal and Wells Fargo Bank ti as multiple RPs for the requested site investigation. In the period since receipt of that letter, Unocal has been in repeated contact with Wells Fargo attempting to establish an agreement (including obtaining site access and allocating financial responsibility) to conduct the requested investigation. We had every intention to comply with the deadline set forth in the July 7, 1994 letter, and were in fact quite surprised to learn that Wells Fargo had arranged for meetings with your department to discuss this site without, our involvement. and that as a result of these meetings you summarily determined that Wells Fargo was no longer an RP. We believe that as a public agency you, at a minimum, have an obligation to invite us to any meeting where allocation of responsibility between multiple RPs is discussed. Nevertheless, as a responsible corporate citizen, we will comply with the request to have a Work Plan submitted to your office no later than October 7, 1994. Access to the property to conduct the investigation will be subject to Wells Fargo's permission (since they are the property owner), so any schedule associated with the Work Plan will be contingent upon them granting site access.