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• i CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION MONITORING AND REPORTING PROGRAM NO. R5-2005-XXXX CALIFORNIA WATER CODE SECTION 13267 FOR PIONEER AMERICAS LLC TRACY, SAN JOAQUIN COUNTY Pioneer Americas LLC (Discharger) 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 cylinders and 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. Groundwater is polluted with carbon tetrachloride 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 and various inorganic compounds, emanating from the property under the control of the Discharger. 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 Regional 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 arel5 monitoring wells screened across three water bearing zones. The groundwater monitoring program for the 15 monitoring wells and any wells installed subsequent to the issuance of this MRP, shall follow the schedule below. Sample collection and analysis shall follow standard EPA protocol.