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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION MONITORING AND REPORTING PROGRAM NO. 5-00-846 FOR PIONEER AMERICAS, INC. —TRACY PLANT FORMER ALL-PURE CHEMICAL COMPANY SAN JOAQUIN COUNTY Pioneer Americas, Inc. (Pioneer; Discharger) operates a 15-acre manufacturing facility at 26700 South Banta Road, Tracy, San Joaquin County(site). Pioneer produces sodium hypochlorite (liquid bleach) from chlorine and caustic and repackages chlorine gas into 150-pound and one-ton cylinders at the site. Pioneer also purchases calcium hypochlorite from another company, which it warehouses and distributes for sale. Contract carriers deliver the products to the wholesale market. The facility currently operates two shifts per day, five days per week, with 22 employees. The site previously had a sulfuric acid repackaging line and a truck maintenance shop. Groundwater at the site, located about 10 feet below the ground surface, is polluted with carbon tetrachloride and various inorganic compounds. Pioneer 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. This Monitoring and Reporting Program (MRP) is issued pursuant to Section 13267 of the California Water Code and is designed to delineate groundwater contaminant plumes and determine whether remediation efforts are effective. The Discharger shall not implement any changes to this MRP unless and until a revised MRP is issued by the Executive Officer. Prior to construction of any new groundwater monitoring or extraction wells, Pioneer shall submit plans and specifications to the 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 eight groundwater monitoring wells with the following screen intervals: • MW-1 through MW-4 screened from 13 to 23 feet bgs • MW-5 and MW-6 screened from 10 to 25 feet bgs • MW-7 screened from 12 to 22 feet bgs • MW-8 screened from 10 to 20 feet bgs The groundwater monitoring program for the eight 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.