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Engineers Planners 11: . ; Economists Scientists August 27, 1995 117606.AG.ZZ Ms. Diane Hinson and Ms. Margaret Lagorio San Joaquin County Public Health Services Environmental Health Division 3 04 E. Weber Avenue P.O. Box 388 Stockton, CA 95201-0388 Subject: Intrinsic Bioremediation Demonstration Disco Site, 1 10 North Filbert Street, Stockton, California t Dear Ms. Hinson and Ms. Lagorio: On behalf of Del Monte, we thank you for meeting with us on August 3, 1995 to discuss the Disco Site located at 110.North Filbert Street in Stockton, California. Your letter to Steve Ronzone of Del Monte dated August 17, 1995 is an accurate summary of the August 3 meeting. As we agreed during the meeting, a one year intrinsic bioremediation demonstration will provide useful data to evaluate the viability of intrinsic bioremediation at the Disco Site: As you requested, this letter provides a statement of the theoretical basis of the proposed intrinsic bioremediation demonstration, the demonstration monitoring parameters, and the implementation schedule. A more detailed description of the proposed intrinsic bioremediation demonstration is provided in the Problem Assessment Report and Final Remediation Plan (PAR/FRP), DelMonte Disco Site (CH2MHILL, April 1995). Statement of Theoretical Basis At petroleum hydrocarbon sites, aqueous phase contaminant plumes Teach a steady state extent, at which point the rate of contaminant biodegradation in the plume :equals the rate of contaminant loading from the source area (the "smear zone") to the groundwater. Research has shown that at many fuel release sites, this.steady state extent is very limited. With time, as the rate of contaminant loading to the groundwater declines, naturally occurring biodegradation results in"shrinking" of the plume. �l�R� 1111 Broadway,P.O,Box 12681,Oakland,CA 94604-2681 570251-2426 Fax 510 893-8205