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s ' <br /> 13 October 1997 <br /> AGE-NC Project No. 97-0372 <br /> Page 2 of 2 <br /> are all below the TTLC of 2,500 ppm for copper, although the concentrations detected in 137-2 and <br /> 137-5 exceed 250 ppm, a concentration equivalent to 10 times the STLC of 25 ppm. <br /> Zinc was detected at concentrations from 27 to 120 ppm.All samples were below the TTLC of 5,000 <br /> ppm. None of the detected zinc concentrations exceeded the STLC of 250 ppm for zinc. <br /> I <br /> The pH for samples 137-2 and 137-5 were 4.5 and 3.6,respectively.The pH for the remaining samples <br /> ranged between 6.7 an 9.0. The two samples with the low pH levels were also the two samples with <br /> slightly elevated copper concentrations. The two samples with slightly elevated chromium <br /> concentrations did not appear to correlate to pH levels. <br /> If you have any questions or comments,please contact our Stockton office at (209) 467-1006. <br /> Sincerely, <br /> Advanced GeoEnvironmental, Inc. <br /> Kevin McKibben Nuel C. Henderson, Jr. <br /> Senior Staff Geologist Senior Staff Geologist <br /> Registered Geologist No. 5837 <br /> Advanced GeoEmironmenlal,Inc. <br />