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California Renal Water Quality Codi itrol Board Central Valley Region Robert Schneider,Chair �N inston H.Hickox Gray Davis Secretwyfor Sacramento Main Office Governor Environmental Internet Address: http://www.swrcb.ca.gov/mgcb5 Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 Phone(916)255-3000•FAX(916)255-3015 Z I :I I Wa '1— 933 Z0 30 January 2002 J; , HL-IV 31 Mr. Jeff Baker Tesoro Petroleum Companies, Inc. 3450S. 344 th Way, Suite 100 Auburn, WA 98001 REVIEW OF EXCAVATION AND SOIL AERATION REPORT, TESORO FUEL TERMINAL, 3003 NAVY DRIVE, STOCKTON, SAN JOAQUIN COUNTY We have reviewed the 14 January 2002 Excavation and Soil Aeration Report(Report) submitted by IT Corporation on behalf of Tesoro Petroleum Companies, Inc. (Tesoro) for the bulk fuel terminal at 3003 Nary Drive in Stockton(site). The Report discusses the excavation and sampling activities performed to address a spill from an oil-water separator caused by a failed check valve in May 1999. Tesoro removed the liquid product on the ground surface and from shallow trenches,pumped groundwater from nearby monitoring well TS-10, and excavated about 240 cubic yards of polluted soil. As part of the remedial efforts, Tesoro treated polluted soil by limited aeration on soil pads constructed at the site in accordance with San Joaquin Valley Unified Air Pollution Control District guidelines. Tesoro collected 19 soil samples along the sidewalls of the excavation and 10 samples from the aerated soil. These samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg),benzene, toluene, ethylbenzene, total xylenes, and methyl tertiary butyl ether (MTBE). The excavation samples contained levels of TPHg,toluene, ethylbenzene, total xylenes, and MTBE that may be related to site operations rather than the 1999 spill. The aerated samples did not contain any constituents above the method detection limits except for TPHg that the laboratory identifies as heavily weathered gasoline. Tesoro proposes to continue aeration of the polluted soil and if necessary, add nutrients to aid degradation, as well as collect samples semiannually for TPHg. As proposed, Tesoro will collect soil samples from the aerated soil during April and October and report these results by 31 May 2002 and 6 December 2002,respectively. By 15 March 2002, please submit a work plan to collect confirmation soil and groundwater samples from the edges of the excavation along with a schedule to collect the samples when site water levels are California Environmental Protection Agency 0 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 reduce demand and cut your energy costs,see our Web-site at http://www.swrcb.ca.gov/mgcb5