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. '11 <br /> ^ P 02 l; <br /> r <br /> Wm. J. Hunter & Associates 2220 Loma Vista Dr, <br /> Registered Geologists Sacramento, CA 95825 <br /> Petroleum& Mineral Appraisers (918)972-7941 <br /> FAX(9 16) 972.1883 <br /> January 27, 1993 A eZ <br /> Frank Morita <br /> 6622 Belmont Place <br /> Stockton, CA 95207 <br /> Ref: Reviaw of ESE, inc. assessment reports submitted in May & " <br /> November, 1992 for work performed at 814 E. Charter Way, <br /> Stockton <br /> Dear Mr. Morita; <br /> As a followup to my letter to you dated December 18, 1992, I have <br /> made a more thorough review of the results and conclusions <br /> presented in the 11-6-1992 report prepared by ESE, inc. , along - <br /> with. a general site assessment of the area. The following <br /> comments will hopefully clarify some obvious misstatements in <br /> that report, and give you a better idea of what the rules are <br /> covering site cleanup and obtaining closure. <br /> A review of topographic and County Flood Control District Maps <br /> confirms the EHD's statement that the highest recent groundwater <br /> level was about 3S' below ground level , (bgl , ) when measured in <br /> the Spring of 1986. This data, along with information on average <br /> rainfall , is critical to determining the levels of contaminants <br /> that can be left in the soil without removal or remediation. <br /> Using the Environmental Fate worksheets from the LUFT Manual , <br /> allowable levels of HTEX that can be left in the soil can be < <br /> calculated; copies of those worksheets are attached to this <br /> letter for your information. <` <br /> based on the results of those calculations, the amounts of "; <br /> Benzene, Toluene, Ethylbenzane, and Xylene, (BTEX, ) measured in <br /> the 7 soil borings placed in March, 1992 all exceed allowable <br /> ,levels for leaving in place. Benzene was the most preeminent, <br /> oceuring in all 7 soil borings; the data is summarized below. z <br /> BENZENE ` <br /> TH-1 Detected in all samples from 35 ' to 50' ; ND at 55' <br /> TH--2 Detected in samples from 35' & 45' ' <br /> TH-3 Detected in all samples from 25' to 50 ' (Htm. ) <br /> TH-4 Detected in all samples from 20' to 45' (Btm. ) <br /> TH-5 Detected in samp1les, at 30' & 40' ; ND a 45 ' (Stm. ) <br /> E TH-6 Detected at 35' & 40' ; ND 0 45' (btm. ) <br /> TH-7 Detected at 34' 1 ND at 35' (Ston. ) y <br /> i <br /> Based on the data, the Environmental Fate worksheet, (EFW, ) C01 � <br /> r� <br />