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Thus the 1000 ppm cutoff should be; <br />' For SB-1 (4-10.5) ( 1300-1000) = 300 = 1 .5 + 10.5' = 12' <br /> 200 200 <br />' For SS-1 ( 10:5-24) ( 1300-1000 ppm) =3000 = 3. 1 ft + 10.5 ft = 13.6' <br /> 95. 6 ppm/ft 95.6 <br />' For SB-2 (210-1000--ppm) - ( -37.6) ft + 14 .5 = (-23. 1 ' ) <br /> 21 ppm/ft (above ground ) <br />' For SB-3 ( 1500_-1000 ppm) = 500 r 5' + 9.5' = 14 .5' <br /> 99.3 99 .3 <br />' Using the highest gradient from an undisturbed sampling , (SB-3) , <br /> for SB--4 we can set a 1000 ppm level at ; <br /> (210-1000 m) - -790 = --7.9' + 23' = 15. 1 ' <br /> 99.3 99.3 <br />' From these calculations we can draw an overdig profile which <br /> should excavate the +1000 ppm-© material . This has been done on <br /> crass sections A-A' and B-B' . <br /> II <br /> PROPOSAL <br /> It is proposed to follow Alternative B as proposed in the T <br /> & T Earth Services Report of August 119 1992 with the following <br />' exceptions . Excavate sides and bottom of the pit configuration <br /> shown on revised Section A-A' and B-B' as included in this <br /> report . The East wall of the pit would be taken back to the fence <br /> line but the additional cost of removing the permanent fence, gas <br />' line and water line to get the relatively small amount of <br /> material seems unwarranted . <br /> In addition, based on the characterization of the <br />' . contamination as diesel only, surface bioremediation would be the <br /> preferred remedial treatment . <br /> ' Respectfully, <br /> 1 <br /> Tim K. Smith <br /> ' Reg . Cal . Geologist 04013 <br /> Reg . Environmental Assessor #291 <br /> 1 TKS:cj <br /> 3 <br /> T & T EARTH SERVICES <br />