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tr <br /> 2 <br /> . r�} \ - <br /> J ' Y <br /> Mr. Don Pratt <br /> Arco#5469 <br /> 930 S. Wilson Way, Stockton CA <br /> E Page 2 oft <br /> decline of contaminant concentrations over time due to advection, diffusion, <br /> dispersion, bioremediation and other natural phenomena that constitute natural <br /> attenuation. The EHD directive was intended to determine whether or not the OS <br /> system is of benefit beyond natural attenuation or if it is ineffective and therefore <br /> not a cost effective remedial alternative. <br /> Please reevaluate the efficacyof <br /> the •S system and include the evaluation in the <br /> SCM. A due date for the SCM will be discussed with you at our 28 November <br /> 2006 meeting. <br /> Questions or comments may be directed to Nuel Henderson by telephone at <br /> (209) 468-3436, or by mail to the address on the letterhead. <br /> Donna Heran, REHS, Director I <br /> Environmental,Health Division l <br /> �I r <br /> Nuel C. Henderson, Jr., PG Margaret Lagorio, REHS <br /> Engineering Geologist Program Coordinator, Unit IV <br /> Unit IV - Site Mitigation <br /> 4 <br /> cc: James L. L. Barton, PG — CVRWQCB <br /> Rusty Benkowsky, PE - SECOR 4 <br /> y <br /> .I <br />