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• Olin Chlor Alkali, 26700 S. Banta Rd. This GeoTracker case is open with a status of "verification monitoring" as of 2010. The contaminants of concern are chlorinated hydrocarbons and volatile organic compounds; groundwater has been affected. "The site is currently a bleach manufacturing facility. Sodium hypochlorite (liquid bleach) is produced from chlorine and caustic. The site previously had a sulfuric acid repackaging line and a truck maintenance shop. Between 1948 and 1957, the site was used for alfalfa dehydration. Between 1957 and 1970, it was used for used tire sorting and storage. The site has been used to manufacture and package bleach since 1975, and previously had 6 ponds. Four were wastewater ponds for manufacturing process liquid (Stormwater Pond, Small Wastewater Pond and Ponds 1 and 2) and two were water storage for fire suppression (Fire Ponds 1 and 2). The Small Wastewater Pond was 4 feet wide, 4 feet long, 3 feet deep, and lined. It reportedly used to collect runoff from the wash rack where empty chlorine containers were cleaned. In 1994 sediment was collected from the pond and disposed off site, and the pond was closed by backfilling it with native soil. Pond 1 and Pond 2, constructed in 1977, were located along the northeastern boundary of the site. They were approximately 60 feet wide, 100 feet long, 4 feet deep, and lined with a PVC liner. Ponds 1 and 2 were used to store process wastewater; occasionally they were used to store cleanup spills within the process area of the plant. In October 1998, pond sediment and the liners were removed and disposed off site. Approximately 570 tons of material were removed. Beginning on August 9, 1999, soil beneath the former liners for Ponds 1 and 2 was excavated and remaining soil tested for soluble sodium and soluble chloride. Approximately 3,200 cubic yards of soil were excavated and disposed off site. Fire Ponds 1 and 2, and the stormwater pond were also closed." The most recent monitoring report (Stantec, 2012) indicates that, during the first quarter of 2012, the main contaminants of concern, carbon tetrachloride and chloroform, were not detected in the monitoring wells closest to the subject Site. The groundwater gradient is to the northeast, away from the subject Site, according to this report, and depth to groundwater is approximately 10 feet bgs. For previous 2011 sampling events reported in the 2011 Annual Report (Stantec, 2012), detections of sodium, chloride, iron, and total dissolved solids (TDS) exceeded the Water Quality Goals in the monitoring well closest to the subject Site. • Chevron, Lyoth Loading Station, Tracy, 26501 S. Banta Rd. Groundwater and soil were impacted in this GeoTracker case, the case was closed in 2009. "The Site is located ... on approximately 6 acres. The Site was historically part of the former Old Valley Pipeline (OVP)... Two former 35,000 barrel above ground storage tanks (ASTs), one former 55,000 barrel AST and associated AST pumps have been removed from the Site. Site investigations were performed between 1990 and 2007, during which time a total of 43 soil borings were advanced and a total of seven groundwater monitoring wells were installed. The extent of the affected soil and groundwater was defined during the course of these investigations. A Human Heath Risk Assessment (HHRA) was completed in LOGE 1303 Page 5