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California Regional Water Quality Control Board <br />Central Valley Region <br />Steven T Butler, Chair Gray Davis <br />*.Hickox <br />Se'reraryfor Sacramento Main Office Governor <br />Fnvironinenral Internet Address hitFJ/wwwswreb ca 90v/rwgcb5 <br />Protection 3443 Routner Road. Suite A, Sacramento, CallfomM 95927-3003 <br />Phone (916) 255-3000 • FAX (916) 255-3015 - - -I <br />18 October 2000 <br />Mr Bob Cochran <br />Chevron Products Co <br />PO Box 6004 <br />San Ramon, CA 94583 <br />Ivem and Roger Baffonl <br />1175 Orangewood Drive <br />Lodi, CA 95240 <br />APPROVAL FOR ADDITIONAL SITE ASSESSMENT <br />FORMER CHEVRON STATION #9-5775,301 WEST KETTLEMAN LANE, LODI <br />CLEANUP AND ABATEMENT (C&A) ORDER NO- 5-00-704 <br />IDF r <br />{�C51�UVL5 <br />OCT 2 0 2000 � U <br />We reviewed your 9 October 2000 Work Plan for Additional Site Assessment/Remedial Well Installatibn <br />(Workplan) and the 18 October 2000 Addendum to Work Plan (Addendum) submitted by your consultant, Secoi <br />International Incorporated (Secor), for the subject site The Addendum was submitted in accordance with our <br />agreements at our meeting with you on 12 October 2000 In our meeting, we agreed to postpone the remedial <br />well installation work, and add additional investigation activities to complete the lateral and vertical definition of <br />aLamination both on-site and off-site Results of this work will be used to prepare a complete, revised Problem <br />ssessment Report/Final Remediation Plan that is due to this office by 4 December 2000 <br />As presented in the Workplan and Addendum, Secor proposes to install a third interim groundwater extraction <br />well, one sentinel well, and ten monitoring wells The extraction well will be installed on-site near existing <br />monitoring well MW -1, and screened from 60 to 80 feet The extraction well will be connected to the existing <br />interim remediation system, and operated until the final remedial alternative is approved and initiated The <br />sentinel monitoring well will be installed near existing monitoring wells MW-8A/8B, and continuously cored <br />from 50 feet to 220 feet Upon completion of the boring and review of subsurface lithology observed from the <br />core, the screened interval for the sentinel well will be determined The ten added monitoring wells will also be <br />continuously cored from 50 feet to the proposed depth of the boring <br />The Workplan and Addendum are approved as presented Please contact Harlin Knoll at the San Joaquin County <br />Environmental Health Division and me at least two business days prior to any site work or sampling to schedule a <br />field inspection appointment If you have any questions or comments, please call meat (916) 255-3115 <br />^-" <br />Marty Hartl <br />Associate Engineering Geologist <br />cc Ms Wennilyn Fua, UST Cleanup Fund, SWRCB, Sacramento <br />Mr Harlin Knoll, San Joaquin County Environmental Health Division, Stockton <br />• Mr Roger Hoffmore, Secor International Incorporated, Sacramento <br />Mr Frank Beeler, City of Lodi Water Department, Lodi <br />California Environmental Protection Agency <br />Qa Recwted Paper <br />