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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION DRAFT MONITORING AND REPORTING PROGRAM NO. R5-2008-0149-XXX FOR IN-SITU GROUNDWATER REMEDIATION AT SITES WITH VOLATILE ORGANIC COMPOUNDS, NITROGEN COMPOUNDS, PERCHLORATE, PESTICIDES, SEMI-VOLATILE COMPOUNDS AND/OR PETROLEUM HYDROCARBONS FOR STALLWORTH AUTO SALES 602 NORTH CALIFORNIA STREET, STOCKTON 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: Stallworth Auto Sales (herein referred to as "the Discharger"). Project Location: A small, single-story office facility with a garage presently occupies the site, which is located at the intersection of North California Street and Oak Street in Stockton, California (Figure 1), in the southwest portion of Section 2, Range 6 East, Township 1 North, Mount Diablo Base and Meridian (MDB&M). The site is in an area of mixed residential and commercial use, and was the former location of a gasoline service station; it is presently utilized for used auto sales. 2. Project Description: On 27 May 1991, one 3,000-gallon diesel UST, one 3,000-gallon unleaded gasoline UST, one 3,000-gallon leaded gasoline UST and one 550-gallon waste oil UST were removed from the site by Otto Watkins, General Contractors. The three 3,000-gallon USTs were located at the southern end of the site; the 550-gallon waste oil UST was located at the northern end of the property. Soil samples collected beneath the tanks indicated that the subsurface was impacted with petroleum hydrocarbons as a result of operation of the former UST. The primary constituents are total petroleum hydrocarbons as gasoline (TPH-g), benzene, toluene, ethylbenzene, and xylenes (BTEX), and 1,2-dichloroethane.