SITE INFORMATION AND CORRESPONDENCE

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2. Background 2. SITE HISTORY The site is located at 75 West Valpico Road about 2 miles south of the City of Tracy (City). The facility is rectangular in shape and is approximately 15 acres in size. The site is bordered by The West Side Irrigation District canal and a residential area to the north, light-industrial and commercial areas to the south, and open fields on both the east and west sides. G-P conducted operations at the site as a chemical packaging facility from 1978 to 1986. G-P transferred facility ' ownership to Stewart Walker Company in 1986, when plastic bottles were made at the site. The facility is presently operated as a container manufacturing facility by Consolidated Container Company. ' The site features a stormwater percolation basin (basin) on the north side that was constructed in 1978. The basin was used for disposal of waste cooling water and stormwater runoff from the plant. The basin is approximately 13 feet belowgrade and had continuously contained a pond of water since at least the early 1980s. Chloroform was formed in the basin when sodium hypochlorite bleach was added to the ponded water to mitigate complaints of sulfite-type odors ' in July 1984. Prior to chlorination, samples were taken from the pond and analyzed. Chloroform was not reported in any of the samples. After the addition of sodium hypochlorite bleach, another set of pond water samples were collected and analyzed in August 1984. Chloroform was reported in these samples. Concentrations ranged between 180 and 220 milligrams per liter. While the majority of the chloroform was created after pond treatment, discharge of treated drinking water ' from the City's South Area Well facility to the basin was recognized as a secondary source of chloroform contamination. ' A sample of City tap water collected in July 1985 contained a reported chloroform concentration of 13 micrograms per liter. A Cleanup and Abatement Order was issued by the RWQCB on September 25, 1984. Based on source removal, ground water treatment, and natural attenuation of compounds of concern, this order was rescinded on November 5, 2003 by the issuing agency (Appendix Q. 1 Report on Well Destruction G-P Former Tracy Chemical Packaging Plant U:12011 Letters and Reports\16014.01\Reports\Well Destruction\Report.doc 75 W.Valpico Road,Tracy,California ©2011.Georgia-Pacific LLC.All rights reserved. ' 2 I