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tug1onal Water Qua1iMOMMMM <br /> Linda S.Adams Centra/ Valley Region Co�of <br /> Secretdw, Karl E. I, Board <br /> EnvironmemalProreepan 1102 OngieY.SCD <br /> O Sun Center Drive 'P'L'•� Chair <br /> ion <br /> Phone #200•Rancho Cordo <br /> http://H,916)464-3291 •F °�California 956J <br /> ww.waterbo AX(916 4 0-611q 01W <br /> ards.ca. ov/ ) 64-4lcy <br /> B centralvalley <br /> 22 April 2009 Arnold <br /> Sch egg <br /> Govcr, , <br /> IL�CrlrviV Governor <br /> Mr. Jeff Baker APR 2 3 2009 <br /> Tesoro Companies,Wa <br /> Auburn, WA 980 ay,Inc. ENVIRONMENT HEALTH <br /> 3450 South 344th quite 100 PERMIT/SERVICES <br /> PILOT STUDY WORK PLAN AND <br /> TECHNICAL. COMM/TTEE F ANNUAL REPORT <br /> COUNTY AC/L/T/ES, PORT OF ' STOCKTON TERMINALS <br /> STOCKTOl1/, SAN JOAQU/N <br /> Regional Water Quality Control Board <br /> Central Board) staff reviewed the 13 April 2009 R sponse)to RW Ion <br /> (Central Valley Water <br /> (Letter) submitted on behalf of the Stockton Terminals Technical Committee <br /> QCB March 71, 2009 Letter <br /> Stantec Consulting Corporation (Stantec). p <br /> at the Port of Stockton (Site) including ) STTC is comprised of three bulk fuel facilities <br /> Petroleum Company Inc. Tesoro British Petroleum (BP) (formerly ARCO), Tesoro <br /> p y ), and Time Oil Company. <br /> In summary, the Letter re5onds to Central Valley Water Board staff comments as <br /> follows= <br /> • Despite the detection 156 micrograms per liter (Ng/L) of total petroleum <br /> hydrocarbons as dies(TPHd) in the deepest groundwater sample, STTC thinks the <br /> vertical extent of TPHcear boring TS/MW-3D has been determined. <br /> • The cross-section pro\,d in the 15 December 2008 Monitoring Well Destruction, <br /> Installation and Additid Assessment Report is a generalized interpretation of the <br /> subsurface based on lied data collected over about 0.4 miles. <br /> • The installation of TS/1-41) to a depth of about 135 feet below ground surface <br /> (bgs) is not contingentthe outcome of the helium-oxygen tracer test. The tracer <br /> test will be conducted been the existing 109-foot TS/MW-3D and the 115-foot <br /> TS/MW-2D. If commurion between the two wells is absent, TS/MW-3DR will be <br /> installed to 115 feet du the same mobilization as TS/MW-4D. Otherwise, <br /> TS/MW-4D will be inst in a separate mobilization. <br /> • Stantec is conducting �review to determine if the appropriate monitored natural <br /> attenuation (MNA) dat/e been collected that would allow the calculation of <br /> biodegradation rates ce of the ozone injection arrays. <br /> • Oxygen will be injectecgroundwater at a pressure of 47.6 pounds per square <br /> inch (psi). <br /> • Thirteen pounds of oxhjected into each well will be sufficient because it fulfills <br /> the empirical 3:1 oxygoetroleum hydrocarbon molar ratio required to promote <br /> oxidation, assuming the is between five and 29 pounds of petroleum <br /> hydrocarbons in the vi)f each well. <br /> Cru Environmental Protection Agency <br /> ea Recycled Paper <br />