SITE INFORMATION AND CORRESPONDENCE FILE 2

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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION MONITORING AND REPORTING PROGRAM NO. R5-2008-0149-010 FOR IN-SITU GROUNDWATER REMEDIATION AT SITES WITH VOLATILE ORGANIC COMPOUNDS, NITROGEN COMPOUNDS, PERCHLORATE, PESTICIDES, SEMI-VOLATILE COMPOUNDS AND/OR PETROLEUM HYDROCARBONS FOR CIRCLE K STORE #1205 16470 CAMBRIDGE DRIVE, LATHROP SAN JOAQUIN COUNTY This Monitoring and Reporting Program (MRP) describes requirements for monitoring a groundwater extraction and/or treatment system. This MRP is issued pursuant to Water Code Section 13267, and has been prepared based on Attachment C, a part of General Order R5-2008-0149. No changes to this MRP shall be implemented unless and until a revised MRP is issued by the Executive Officer of the Central Valley Water Quality Control Board (Board). As appropriate, Board staff shall approve specific sample station locations prior to implementation of sampling activities. PROJECT 1. Parties Submitting a Notice of Intent under General Order R5-2008-0149: ConocoPhillips (hereafter referred to as the "Discharger'). 2. Project Location: The project is a service station/convenience store in the city of Lathrop, San Joaquin County, Township/Range/Section 1S, 6E, S26, Mount Diablo Base & Meridian. The assessor parcel number is 196-430-32. 3. Project Description: Vehicle fueling operations at the Circle K Store # 1205 have caused pollution of soil and groundwater by petroleum constituents. The primary constituents are total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, and xylenes (BTEX), and methyl tert-butyl ether (MtBE). The petroleum impacts were found during removal of underground storage tanks (UST) at the site in 1997. From 1997 to present, a number of soil and groundwater investigations have been completed. Limited remedial measures have been conducted in the past that include soil overexcavation. Although the previous remedial efforts were moderately successful, it has been determined that additional remedial efforts are required to more expeditiously and cost-effectively clean up the impacts to groundwater. The Discharger proposes to conduct a limited pilot study, to be followed by full implementation depending upon the success of the pilot study, for remediating the existing petroleum impacts using in-situ chemical oxidation, to run concurrently with the proposed soil vapor extraction system. The Discharger proposes to inject ozone, and an approved