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' SECOR INTERNATIONAL INCORPORATED <br /> www.secor.com <br /> S E C 0 R <br /> potentially due to carry over of suspended particulates or organically complexed chromium. The <br /> low concentration of total chromium, and the lack of hexavalent chromium indicate that the <br /> ' chromium should not be an ongoing problem. <br /> SECOR recommends that GTI request authorization from the RWQCB to conduct a field scale <br /> Pilot study or allow a phased implementation of ozone sparging during which time the RWQCB <br /> can require additional sampling for hexavalent chromium. <br /> ' If you have any questions regarding the proposed study, please contact Dr. Angus E. McGrath <br /> at (925) 299-9300. <br /> ' Sincerely <br /> SECOR International Incorporated <br /> ' <br /> Angus g s E. McGrath, Ph.D. <br /> ' Principal Geochemist <br /> Attachment(s): <br /> M Table 1 — Bench Scale Sampling Groundwater Analytical Data <br /> Table 1 a— Bench Scale Sampling Groundwater Analytical Data (21812005) <br /> Table 2— Bench Scale Sampling Soil Analytical Data <br /> ' Attachment 1 — Excelchem Analytical Report <br /> 1 <br />' 3 <br />