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Wm. I Hunter & Assoclate5 2220 Loma Vista Dr. <br /> $'"r `jr'M I' '" Sacramento, CA 95825 <br /> Registered Geologists,. „� r� r�i 01L fir <br /> _ rYr` �' I$Lj}l 916 972-7941 <br /> Petroleum 8�Mineral Appraisers +� ..�r.�'VEC;: ( ) <br /> P FAX (916) 972-1683 <br /> 98 SEP 16 >' 1: ®7 <br /> September 14, 1998 <br /> Margaret Lagorio, Supervising RENS <br /> Site Mitigation Unit <br /> San Joaquin County PHS <br /> Environmental Health Division <br /> 304 E. Weber Ave., Third Floor <br /> Stockton, CA 95202 <br /> Re: 2969 Loomis Road, Stockton; Site Code 2015 <br /> Per your correspondence of August 31, 1998, we have enclosed the QA/QC sheets for the <br /> laboratory work associated with the 12/2/97,3/30/98, and 7/1/98 samplings at the above <br /> site. The December, 1997 quality control sheets should have been forwarded to your <br /> office earlier this year by Sherwood Labs; we apologize for not following up on that <br /> matter. We have informed the laboratory to include QA/QC sheets with all future results. <br /> Paragraph three of your 8/31/1998 letter refers to the direction of the hydraulic gradient as <br /> shown in our 8/17/1998 report. PLATE 1 shows it to the northwest, but the text says <br /> northeast. A close examination of that plate reveals that there appear to be three <br /> gradients. One is to the northeast based upon MW-1, 2, & 3; one to the northwest based <br /> upon MW-2, MW-1, and MW-4; and one to the southwest based upon MW-1 &MW-4. <br /> Prior monitoring events have shown the gradient to be indeterminate, and very flat. We <br /> have stated in prior reports that the divergent gradient indicates a very restricted aquifer <br /> that is not within the sphere of influence of any withdrawal points in the area. We will be <br /> more s Pcr <br /> oncerning the potentiometric surface in future reports. <br /> W te &Associates <br /> C <br /> c hn Marci -_- <br />