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�l Ms Lori Duncan October 10, 2003 Page 3 Groundwater Groundwater Well IDs Monitoring Sampling Frequency Frequency ARCO Service Station E-9, E-10, PR 1,and BHD 1 Quarterly Quarterly E-2, E-3, E-4, E-5,E-61 E-81 Quarterly Semiannually E-11,E-12, MW-1 E-7,PR-2, BHD-2, MW-2, Quarterly Annually MW-3,MW-4,MW-5 Chevron Service Station MW-1 through MW-9, City of Quarterly Quarterly Stockton Well#10 Wells E-9, E-10, and BHD-1 will remain on a quarterly sampling schedule, based on their locations, which are downgradient from the underground storage tanks (USTs) and upgradlent of the nearby Chevron Service Station, and the presence of residual concentrations of petroleum hydrocarbons and MtBE in the wells Despite historically non-detectable concentrations of petroleum hydrocarbons and • MtBE, well PR-1 will remain on a quarterly sampling schedule, due to Its close, upgradlent proximity to City of Stockton Municipal Well #10 As requested in the SJCEHD September 11, 2003 letter, SECOR submitted an encroachment permit application package to the City of Stockton Public Works Department (CSPWD) on September 17, 2003 for uncovering ARCO well E-8 and raising the well box to grade Fallowing approval of the permit and completion of well repair activities, a groundwater sample will be collected from the well during the fourth quarter 2003 groundwater monitoring and sampling event Following review and approval by the SJCEHD, SECOR will implement the proposed modifications to the groundwater sampling program at the ARCO Service Station during the fourth quarter 2003 If you have any questions, please call us at (916) 861-0400 with any questions regarding this submittal Sincerely, SECOR International, Incorporated 1��Vll 4V k'bA k� Kasten Fiesoras ��SQR�F�E q�Fy Project Scientist ��, N cu QC NO C 058399 i us Benkosk P E * EXP - Senior Engine JTq CML a j I WRC0121331Misc LetterslSHCEHD RspLtr&M&S Redx Req doc '