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I l , <br /> CLEARWATER <br /> G R O U P, I N C <br /> r <br /> September 20, 1994 D p <br /> S Q <br /> Ms Linda Turkatte EP 2 3 1994 ' <br /> San Joaquin County ENVIRO <br /> PHS/EHD <br /> pERMIMs VI kl s LTH <br /> 445 N San Joaquin Street <br /> Stockton, CA 95201 <br /> Re Additional Vapor Well Installation, 1702 Jackson Street, Escalon, CA <br /> Dear Ms Turkatte, <br /> The purpose of this letter is to present Clearwater Group, Inc `s workplan for the <br /> installation of two additional vapor wells, as well as other recommendations, for , <br /> . the above referenced property As we discussed on September 14th, Clearwater <br /> recommends the installation of these two- new vapor wells due to the fact that <br /> existing vapor wells are located in an area free of contamination Although these <br /> existing wells may address the contamination over time, this approach is definitely <br /> not the most expedient or-cost effective - Mrs Ekholm, the property owner, has <br /> expressed her desire to attain closure at this site as quickly as possible <br /> In order to proceed quickly with the system installation, drilling has been scheduled <br /> for October 3, 1994 I will give you a call on September 23rd to confirm this date with <br /> you <br /> Vapor Well Installation/Soil Sampling, <br /> Clearwater recommends the installation of two vapor extraction points in the <br /> vicinity of MW-1 (refer to the proposed well location map) The two points are <br /> necessary in order to address the contamination in two different types of subsurface <br /> lithology VW-4 will be screened from ten to forty feet below grade, which will <br /> allow vacuum extraction through the upper sandy region VW-5 will be screened <br /> from forty to fifty feet below ground surface It is in this region that a silty sand to <br /> clay layer has previously been encountered In order to obtain the maximum <br /> 1125 Atlantic Avenue 9 Suite 102•Alameda •Cahfon-ua• 94501 9 (510)337,8730 •Fax(510)523-0984 <br />