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t <br /> = <br /> CLEARWAT <br /> G R o U P, r N C. f4l� !) F c <br /> 1: 17 <br /> Ms. Linda A. Turkatte, Senior R.E.H.S. March 16, 1995 <br /> San Joaquin County Public Health Services <br /> Environmental Health Department <br /> P. O. Box 3$8 <br /> Stockton, CA 95201-0388 Lj <br /> Re: Ekholm Property, 1202 Jackson Street, Escalon <br /> Dear Ms. Turkatte, <br /> Enclosed please find the information we have discussed in our recent <br /> con versations. I have also provided copies of the pilot performance information we <br /> generated during the brief test following installation of VW-4 and VW-5. I Dope <br /> you find this material useful. <br /> I have ah-.o included a copy or a good article on bioventing. Of particular import is <br /> the discussion of oxygenation of the subsurface for the purposes of increasing the <br /> rate of blod.egiedati.on of less volatile hydrocarbons. As you are aware, it appears as <br /> if most c;f {he measured hydrocarbons at this site fall into the less volatile range. <br /> this '4^eir! cx.e case, it is anticipated that biodegredation, as opposed to vol.atiliZzation, <br /> will ref: the predominant mechanism of hydrocarbon remediation. <br /> Over the course of this project we will be incorporating methods of m:�asu,rirg bio- <br /> activity as discussed in this article. The results of these measurements drill assist is <br /> n the determination of the most appropriate time to discontinue soil vapor <br /> extraction and plan confirination boring activities. <br /> I will keep you apprised of project developments as they occur. If you have any <br /> questions or comments in the interim, regarding this project or re medial. <br /> approaches in general, please do not hesitate to c.ortact me. <br /> Regards, <br /> Clearwater Group, Mc. <br /> Mark B. Niebanck, R. G. <br /> Operations Manage <br /> enc. <br /> CC. iv:r5. Margaret Ekholm, w/o enc. <br /> Nos. Brooke Iiirkie, Neumi'_ler & Beardslee <br /> Nis. Elizabe6a 'Thayer, RIATQCB <br /> 1125 Atlantic Avenue 9 Suite 102•Alameda •California•94501 • (510)337-8730•Fax(510),523-0984 <br />