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Gonal Water Quality ontrol Board °ao California Reg Q t3' Central Valley Region. Robert Schneider, Chair Gray Davis Winston H. Hickox Governor Secretaryfor Sacramento Main Office Environmental Internet Address: http://www.swrcb.ca.gov/—rwgcb5 Protection 3443 Routier Road, Suite A, Sacramento, California 95827-3003 Phone (916) 255-3000 • FAX (916) 255-3015 1 Febuary 2002 Mr. William Barber BP Oil Company 200 Public Square 7-I Cleveland, Ohio 44114-2375 a S :Zi ad � - 83J zo NUM _w!h'3i'�is�i SOIL CLOSURE, GROUNDWATER MONITORING PROGRAM REVISION, BP OIL COMPANY/ APPLIED AEROSPACE STRUCTURES CORPORATION, STOCKTON, SAN JOAQUIN COUNTY We have reviewed your 12 December 2001 letter referencing the 12 June 2001 Soil Closure Report, Former Hazardous Materials/Waste Storage Area at Applied Aerospace Structures Corporation (Soil Closure Report) and the 5 November 2001 Request for Revision of Groundwater Monitoring and Reporting Schedule for the BP Oil/Applied Aerospace Structures Corporation in Stockton. The 12 December letter also references various communications via telephone and e-mail between Mr. Fred Kintzer of Parsons Infrastructure and Technology Group and Philip S. Isorena of the Board staff. The Soil Closure Report requested no further action for the site soils and evaluated results of: (1) soil vapor extraction (SVE) treatment at source areas; (2) soil vapor sampling and analyses; and (3) vadose zone modeling using VLEACH. The report also recommended dismantling of the SVE system and decommissioning of the vapor extraction and vapor monitoring wells. The proposed revisions to the monitoring program include: (1) sampling of the full array of groundwater monitoring wells (MWs) in February and August each year; (2) sampling of only MWs 5R, 6, 11, and 12 in May and November; and (3) sampling and analysis of the six extraction wells from monthly to every other month. During a 15. November 200 1 telephone conversation between Mr. Kintzer and Mr. Isorena, we expressed to Mr. Kintzer our concurrence with the Soil Closure Report findings and recommendations, proposed revisions to the monitoring program, and decommissioning of the vapor extraction and monitoring wells. This letter documents those approvals. We will send you a draft Monitoring and Reporting Program for your review and comment to formally establish the monitoring requirements. California Environmental Protection Agency �a Recycled Paper The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. For a list of simple ways you can do to reduce demand and cut your energy costs, see our Website at http://www.swrcb.ca.gov/rwgcb5.