SITE INFORMATION AND CORRESPONDENCE

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I ' w CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION MONITORING AND REPORTING PROGRAM NO. R5-2007 -0804 CALIFORNIA WATER CODE SECTION 13267 FOR PIONEER AMERICAS LLC TRACY, SAN JOAQUIN COUNTY Pioneer Americas LLC (Discharger) leases and operates a 15-acre manufacturing facility at 26700 South Banta Road in Tracy, San Joaquin County (Site). The Discharger acquired the lease for the Site upon the acquisition of the All-Pure Chemical Company (All-Pure) in 1989. The previous owner of All-Pure (and current owner of the Site property) purchased the property in 1975 from Anderson Tire Recapping Company. Anderson Tire Recapping Company developed the Site in 1945, before which the Site was used for alfalfa production. The Discharger currently produces sodium hypochlorite (liquid bleach) from chlorine and caustic, and repackages chlorine gas into 150 and 2,000 pound cylinders. Also, the Discharger purchases calcium hypochlorite from another company, which it warehouses and distributes for sale at the Site. The Site previously had a sulfuric acid repackaging line and a truck maintenance shop. Groundwater at the Site is about 15 feet below the ground surface. Waste constituents in groundwater from the Site include carbon tetrachloride, chloroform, and various inorganic compounds. This pollution impaired the beneficial uses of this water resource. This Monitoring and Reporting Program (MRP) is issued pursuant to Section 13267 of the California Water Code and is necessary to delineate groundwater pollutant plumes and determine whether remediation efforts are effective. Existing data and information about the Site show the presence of various chemicals, including carbon tetrachloride, chloroform, and various inorganic compounds, emanating from the property under the control of the Discharger at concentrations in excess of the applicable Water Quality Objectives. The Discharger shall not implement any changes to this MRP unless and until a revised MRP is issued by the Executive Officer. This MRP replaces the requirements listed in MRP No. 5- 00-846, which was issued on 17 November 2000. Prior to construction of any new groundwater monitoring or extraction wells, and prior to destruction of any groundwater monitoring or extraction wells, the Discharger shall submit plans and specifications to the California Regional Water Quality Control Board, Central Valley Region (Regional Water Board) for review and approval. Once installed, all new wells shall be added to the monitoring program and shall be sampled and analyzed according to the schedule below. GROUNDWATER MONITORING As shown on Figure 1 , there are eighteen monitoring wells screened across three water bearing zones, three industrial water supply wells, and four private domestic water supply wells. Fifteen of the monitor wells are owned and maintained by the Discharger, one of the wells is an industrial production water supply well that has been converted by the Discharger to a monitor well, and two of the wells are monitor wells owned and operated by the U.S. Department of Defense Logistics Agency at their distribution depot located approximately