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GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Escalon, California 95320 <br /> Telephone: (209) 8 <br /> Facsimile: (209)838-938-9838-9888 <br /> 8833 illllv(UU Il VV 11�� <br /> FEB 13 2002 <br /> February 12, 2002 ENPERMIMSERVICESH <br /> Ms. Rebecca E. Setliff <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 E. Weber Ave., 3rd Fl. <br /> Stockton, CA 95202 <br /> Subject: Addendum to Workplan for Additional Site Activities <br /> 102 South Wilson Way, Stockton, California (Figure 1) <br /> Dear Ms. Setliff: <br /> This Workplan Addendum is submitted on behalf of the Knowles Family 1993 Revocable Trust in <br /> response to EHD comments concerning our Workplan for Additional Site Activities(Workplan) dated <br /> October 31, 2001. <br /> AMENDMENTS TO WORKPLAN <br /> Destruction of Monitoring Well MW13 <br /> Well MW13 will be destroyed per San Joaquin County Well Standards, sectionl3.17.6. The well <br /> will be drilled out to total depth and backfilled to the surface with cement slurry. The location of <br /> well MW 13 is shown on Figure 2. <br /> Vapor Extraction System <br /> During the first quarter of 2002, the vapor extraction system will be pulsed several times in order <br /> to verify the current potential rate of petroleum hydrocarbon removal from the subsurface. <br /> Installation of Additional Groundwater Monitoring Wells <br /> In our October 31, 2001 Workplan, we proposed to install one multi-level monitoring point <br /> downgradient of the leading edge of the "Knowles Plume". The monitoring point was to consist <br /> Roek\c1osure\workp1m\sddmdum.doc <br />