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CLEARWATERFILE DOPY C R O U P, I N C Enarrannitntei Strvicrs Mr Harlan Knoll June 1, 1998 Sari Joaquin County PHSIEHD P O Box 388 Stockton,CA 95201-0388 Re. Fortner E-Z Serve Site No 100878, 1012 West Yosemite,Manteca Tear Mr Knoll, I am glad we had a chance to catch up last week This letter documents our conversation,and will serve as a brief workplan for the desenptlon of the next project step at the referenced location Background An environmental investigation was initiated at this site following the detection of a suspected fuel hydrocarbon release in 1959. A total of eight monitoring wells were installed over the course of the site assessment, and the dissolved contaminant plume was defined to the satisfaction of the San Ioaquin County PHSIEHD staff Numerous groundwater sampling events occurred in the succeeding years Results of analysis of samples collected during these events demonstrated a steady decline in concenirdtton of contaminants Scope of Work As we discussed, the low Ievels of dissolved hydrocarbons present in groundwater do not warrant engineered remedial action, and the case may qualify for closure Prior to a petition for closure, the PHSIEHD has requested a final round of groundwater monitoring, with samples from each well tested for concentrations of fuel additives by EPA-Mt 8260 Clearwater shall complete the required scope of activities, and prepare a report documenting sampling and testing results. If concentrauons of contaminants remain low, and additive levels are within an acceptable range, Clearwater shall complete a request for project closure. The monitoring wells shall be properly abandoned following County and RWQCB concurreace with the closure request. i i , E k 5-'0 Third Street 5wte 104' Qak6and ;Califofma 44607 + Te1ep11br�e 5i0-S93-5160 + Fax 510-593-5a1 dno0j!) 831UM803-0 ,W020 It e6,!,6Z t4rif �'