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u %IJ San Joaquin County O.P4uIN' .0 Environmental Health Department DIRECTOR Donna Heran,REHS r. . 600 East Main Street Q. '� PROGRAM COORDINATORS H: •. Stockton, California 95202-3029 Robert McClellon,RENS Jeff Canuesco,REHS,RDI •.Cq ��P Website:www.S]gov org/ehd Vasey Foley,REHS �rF°w Phone: (209)468-3420 unmrurketle,REHs Fax: (209)46"138 March 3, 2011 ConocoPhillips Company Mr. Darrell Eppler Mr. Eric Hetrick 2701 W. March Lane 76 Broadway Stockton,CA 95219 Sacramento, CA 95812 Subject: 76 Station#5886 AP#: 114-060-05 2701 W. March Lane LOP Case#: 1176 Stockton, CA 95215 Global ID#: T0607700718 The San Joaquin County Environmental Health Department (EHD) has received a Concurrence to No Further Action Request letter from the Central Valley Regional Water Quality Control Board (CVRWQCB) dated February 14, 2011. The site is now qualified to apply for monitoring/remediation well removal. Please submit a proposal that details the methods and materials to be used to destroy the wells, which addresses the following well destruction concerns and requirements of the EHD, and the destruction of the UST welt: • Wells that have laboratory data of the last sampling event that found contaminants present are to be destroyed by removing the contents of the well (PVC, sand, bentonite). The cleared borehole is to be sealed with neat cement by grouting from the bottom up, to five feet below grade. • Wells that were found at their last sampling event to be non-detect for contaminants, with acceptable detection limits, may be destroyed by pressure grouting with the well casing left in place. The top five feet of the well shall be drilled out with the same size auger as originally installed, and the top of the well sealed to a mushroom cap with at least 18 inches of neat cement grout. • EHD records indicate 'nested' wells are present at this site that were installed using a 10-inch auger. The EHD requirements for destruction of nested wells include removal of the contents by using an auger larger than the original 10-4nch auger. The destruction auger shall be centered on the deepest casing (which is off-center in the original borehole) and sized to reach out and remove the contents of all nested wells installed during construction. • This site has nine wells that are located off-site in the City of Stockton right of way. Please submit a copy of the City encroachment permit along with your EHD Well and Boring Permit Application forms for these wells.