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Mr. Nathan Crum - 3 - 21 October 2010 <br /> Valley Pacific Petroleum Ser\, <br /> MW-6R, MW-9R, and MW-8 and the elevated vapor concentrations observed in <br /> VEW1 indicate that separate phase product (SPH) may be present in this extraction <br /> well. Valley Pacific must continue to implement its SPH removal program and house- <br /> keeping practices to prevent additional releases to promote successful <br /> implementation of the proposed remedy. <br /> 2. The presence of free product in the area of the VEW 1 indicates that influent vapor <br /> concentrations may be sustained at elevated concentrations for an extended period <br /> following implementation of the remedy. We anticipate that these high concentrations <br /> will initially be treated by thermal catalytic oxidation, as in the pilot test. In the event <br /> that concentrations do decrease rapidly, however, we request that the CAP identify a <br /> plan to efficiently obtain a permit from the San Joaquin Valley Air Pollution Control <br /> District to switch to a granular activated carbon (GAC) treatment system, if necessary, <br /> to minimize down time. The CAP should also identify the influent vapor concentration <br /> thresholds at which a plan for the air-sparging evaluation will be prepared. <br /> Please submit the CAP by 31 December 2010. If you have any questions regarding this <br /> letter, you may ntact meat (916) 464-4811 or betaylor@waterboards.ca.gov. <br /> BRIAN TAYLOR, P.G. <br /> Engineering Geologist <br /> cc: Mr. Harlin Knoll, San Joaquin County Environmental Health Department, Stockton <br /> Mr. Gregory Stahl, Ground Zero Analysis, Inc., Escalon <br /> Mr. Patrick Riddle, Law Offices of Patrick D. Riddle, Acampo <br /> Mr. John Miller, Valley Pacific Petroleum Services, Inc., Stockton <br />