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APR 22 '91 10:37 ERM-WEST (916) 444-5313 P. <br /> Mr. Harlin Knoll April 22, 1991 <br /> a Preparation of a brief report of the findings of the additional <br /> investigation to be designated as Appendix K of the March 1991 <br /> Site Assessment Report, <br /> Figure A•1 shows the locations of the proposed borings. Boring 1.1 will be <br /> installed to determine the maximum depth of occurrence of the product <br /> identified in the August 1989 soil investigation. We estimate that the total <br /> depth of this boring will be 40 to 45 feet. Two soil samples for laboratory <br /> analysis will be submitted from Boring 11. One sample will be submitted for <br /> purposes of further waste characterization. The other sample will be a <br /> clean confirmation sample from the bottom of the hole. <br /> Borings 12 and 13 will be installed to confirm the lateral extent of the <br /> product affected soil on the eastern perimeter of the original borings <br /> installed in August 1989. These borings are not expected to encounter any <br /> product affected soil. Any product affected soil encountered in Borings 12 <br /> and 13 will be noted on the boring logs. No samples from Borings 12 and 13 <br /> will be submitted for laboratory analysis. <br /> Procedures for boring installation, sample collection and Dandling, and <br /> boring abandonment will be as previously described in the Workplan. <br /> i 10, 31923"T <br /> APR go i9t <br /> ENVIRONMENT HEALTH <br /> PERMR/SERVICES <br /> A-2 <br />