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Tosco Marketing Company <br /> _ - 2000 Crow Canyon Place,Ste.400 <br /> Sen Ramohone: 10-27Califonia-2394583 <br /> n Telephone:510-277-2305 <br /> 1I v Facsimile:510-277-2351 <br /> `,� _91 52 Emironantal Compliance <br /> TOSCO 97 DEC 15 i 7 mDeepanment <br /> November 26,1997 <br /> Ms.Mary Maeys <br /> San Joaquin Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton,CA 95202 <br /> Unocal Station#6981 <br /> 4707 Pacific Avenue <br /> Stockton, California <br /> Dear Ms.Maeys: <br /> Tosco Marketing Company(Tosco)was informed today that groundwater samples for the 4's Quarter monitoring and <br /> sampling event were analyzed by the EPA 8260 method,as per your request. Unfortunately,the field technician for <br /> MPDS misinterpreted your request on October 15, 1997,and completed the chain of custody for MtBE only, rather <br /> than indicating the analyses were to be performed for oxygenates. Tosco had also verbally instructed MPDS to analyze <br /> all groundwater samples for oxygenates by the 8260 method. We apologize for any inconvenience and any <br /> miscommunication between the San Joaquin County,MPDS and Tosco. <br /> We have contacted our primary consultant,GeoStrategies,and requested that they contact your office to schedule the <br /> resampling of the groundwater monitoring wells for analysis of the oxygenates. Once the results are available,they will <br /> be incorporated in the 4'Quarter monitor and sampling report as an addendum. <br /> If you have any questions,please feel free to contact me at(510)277-2311 <br /> Sincerely, <br /> zo'-So'� C . R. - <br /> Edward C.Ralston <br /> Project Manager <br /> cc: James Munch,SWRCB <br /> Tom Skok,Tosco <br /> Greg Gurss,GSI <br /> Erin Gamer,PEG <br /> Ron Schwab,Unocal <br />