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GROUND ZERO ANALYSIS, INC. _ <br /> 2291 W. March Lane, Suite 127D ` ' <br /> Stockton, California 95207 <br /> Telephone: (209) 952-3481 <br /> Facsimile: (209) 952-9892 <br /> January 25, 1996 <br /> Ms. Linda Turkatte <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 445 North San Joaquin Street <br /> PO Box 388 <br /> Stockton, CA 95201-0388 <br /> Subject: Amended Table and Figures for Corrective Action Plan (CAP) <br /> Knowles/Roek Property, 102 South Wilson Way, Stockton, California <br /> Ms. Turkatte: <br /> At your request, Ground Zero Analysis, Inc. (Ground Zero) is writing to address and correct <br /> inconsistencies in the CAP submitted in December 1995. One inconsistency concerns the depth <br /> from which a particular soil sample was collected in boring SB-29. In Table 2 of the CAP, this <br /> sample, which contained 16,000 parts per million TPHg, was identified as "SB29-55.5" and was <br /> represented as having been collected at a depth of 55.5 feet. <br /> Chain of custody documentation, the laboratory report and the boring log identify this sample <br /> as having been collected at a depth of 5.5 feet. Nevertheless, a review of the PID readings and <br /> visual/olfactory observations made during the drilling of SB-29 strongly suggest that the sample <br /> was collected from 55 feet. We feel the sample depth was probably misidentified on the soil <br /> tube end cap and thus transposed incorrectly to the chain of custody. Consequently, for the <br /> present we are retaining the interpreted sample depth of 55.5 feet in Table 2 and on the cross <br /> sections. <br /> The dilemma can be easily solved, if necessary, by a shallow hand auger boring in the location <br /> of SB-29. <br /> Another oversight was the lack of analytical results reported in Table 2 for samples collected <br /> from SB-37/MW-13 at 10.5, 20.5, and 30.5 feet. The cross section(Figure 6) indicates samples <br /> were collected at these depths, but the laboratory results were not summarized in Table 2. <br /> Samples were collected at these depths, and all had nondetectable TPHg and benzene, toluene, <br /> ethylbenzene, and total xylenes (BTEX) concentrations. Table 2 has been corrected, and is <br /> attached. <br /> groundm\roek\chngs1a.cap <br />