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CLEARWATER <br /> G R O U P, I N C. <br /> i <br /> Envi101iillepw Services <br /> • Although soil will likely be remediated before groundwater, continue soil vapor <br /> extraction to recover sparged air. However, soil vapor recovery rates only need, <br /> to be sufficient to capture sparged air (i.e. soil vapor extraction flow rates only <br /> need to equal approximately 3 times the air sparge flow rate). Convert vapor <br /> processing and treatment to an appropriately sized small blower and activated <br /> carbon; <br /> I <br /> • Petition for regulatory closure after hydrocarbon recovery rates decrease and <br /> become asymptotic with time (i.e. <1 lbs/day); <br /> • Decommission all wells and system components upon receipt of regulatory <br /> P p p g Y <br /> closure. <br /> If you have any questions or s project, <br /> require additional information regarding this ro <br /> � � <br /> please feel free to call me. <br /> Sincerely, D �JeO <br /> CLEARWATER GRO C <br /> a: CO 0. 6505 <br /> (N <br /> Brian Gwinn, R.G. OF CA`��oQ' <br /> Project Geologist <br /> attachments <br /> cc: Mrs. Stella Ruiz, Ruiz Grocery <br /> Ms. Brooke Birkie, Neumiller & Beardslee <br /> Ms. Elizabeth Thayer, CVRWQCB <br /> Ruiz.4491 W.Durham Ferry.Tracy.CA 5 November 12,1996 <br />