SITE INFORMATION AND CORRESPONDENCE 1995-2004

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James L. Tjosvold, A • October 5, 1999 Page 6 the potential formation of more toxic partial degradation products, such as polychlorinated dibenzo-dioxins or furans. Waste products from the destruction are carbon dioxide gas and water vapor. The use of clean-burning natural gas as fuel significantly reduces hydrocarbon releases from the dryer. Thermal dryers/thermal oxidizers are in use in similar applications throughout California. Elimination of the stockpiles before the onset of the rainy season is a prudent step from both the environmental and public acceptability standpoints. Despite PG&E's imposition of runoff control measures, maintaining a large stockpile onsite throughout the rainy season always increases the potential for soils, and contained contaminants,to be carried offsite in runoff. Delays in eliminating the stockpiles will postpone installation of the site cap, further increasing the potential for rainfall intrusion through the post-remedial amounts of residues which remain on site. The inability to treat wastes on site would result in the shipment of approximately 1600- 1700 cubic yards of waste to a RCRA Subtitle C hazardous waste facility, resulting in an increase in local truck traffic brought about by the necessity to use smaller shipping containers which can be loaded into railcars. PG&E supports the community's right to know of the proposed modifications to the Stockton site remedy, and we are committed to providing full public notice of the proposed modifications, consistent with regulations governing the federal CERCLA program. We will develop an Explanation of Significant Differences document, with supporting information,which will reside in the local information repository and in DTSC files, and we will publish a notice that summarizes those differences, and the reasons for such differences, in a major local newspaper. Finally, it bears mentioning that PG&E has only to complete the management of these soils to complete its soil remediation at the Stockton site,which has resulted in the excavation and removal of more than 15,000 cubic yards of soil since the inception of field work on May 18. PG&E appreciates DTSC's support throughout the Stockton former MGP remediation project. Thank you for your consideration of this request to modify the remedy at the site,which we believe represents a more expeditious, cost- effective and environmentally responsible approach. If you have any questions concerning this request, or wish to receive additional information regarding our proposal, please do not hesitate to contact me at(415) 973-7601 or Patricia Sullivan, the PG&E site manager, at(415) 973-6254. Sincerely, e ,� ��