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CLOSURE REQUEST REPORT Section No 5 0 Former American Forest Products Company 07/31/01 2801 West Lane Page 5-1 Stockton,California 50 ADDITIONAL INFORMATION REQUIRED FOR CLOSURE This section presents responses to the request for information in addition to that presented in Tn-Regional Board Staff Recommendations for Preliminary Investigation and Evaluation of Underground Tank Sites, Appendix B, Checklist (March 1994) 1. A listing of all tanks at the site, their sizes, contents, when they were removed and when and where they were disposed. Three USTs were located in the vicinity of the maintenance shop A 10,000-gallon UST and pump island were located on the western side of the building A 500-gallon UST, used for the storage of waste oil, was located on the eastern side of the maintenance shop According to plant personnel, a 325-gallon underground gasoline or diesel tank also existed on the northern side of the building but was evidently removed However, no records of the removal of the 325-gallon UST were kept The 10,000-gallon and 500-gallon USTs were removed on May 11, 1988 Tank removal was observed by a representative of the PHS-EHD Documentation regarding the final disposal site for the USTs is not available 2. A listing of all piping at the site, the quantity of piping in linear feet, when it was removed and when and where it was disposed. Approximately 80 linear feet of pipeline associated with the 10,000-gallon diesel tank was excavated and removed during the summer of 1991 In addition, approximately 150 cubic yards of soil in the area of the underground fuel pipeline was excavated, removed, and disposed in accordance with the permit application (Dames & Moore, 1991b) Site restoration included backfilling of the excavation with pea gravel and capping with asphalt Site restoration was conducted by Environmental Geotechnical Consultants of Stockton, under the supervision of Dames & Moore Documentation regarding the final disposal location of the piping is not available 3. A listing of quantities of excavated soil, purge water, soil cuttings, and barrels and when and where they were disposed of Approximately 3,100 tons of treated soil from the UST excavations and monitoring well installations was disposed at the BFI Landfill, located in Livermore, California Approximately 160 cubic yards of soil exevated during the piping demolition was disposed at Port Costa Materials, Inc , located in Port Costa, California A 55-gallon drum of piping ansate was disposed by Chico Drain Oil Service, in Chico California Soil generated from monitoring wells installed after 1990 were collected in drums and disposed, most recently at TPS Technologies in Richmond, California Approximately 4 cubic yards of soil was generated during well and soil boring drilling conducted since 1990 Purge water generated since 1998 (approzlmtely 50 gallons per sampling event) was disposed to the City of Stockton wastewater system,under permit number P 106984104 4. Greatest and least depths to groundwater bellow ground surface. The depth to groundwater at the Site as measured in monitoring wells since August 1990, has varied from approximately 35 feet bgs in May 2000 to approximately 69 feet bgs in July 1991 Current water levels are approximately 38 feet bgs Seasonally, water levels vary approximately three feet, with the shallowest water levels typically measured in late spring, and the deepest water levels in early winter(Table 2) K\840191afp1afp—c1osure_rpt doc 07/31/01 3 24 PM