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Mr. Marshall Cloud <br /> August 31, 2004 <br /> Page 4 <br /> detected TCE in soil gas at 4 feet bgs to 8 feet bgs with concentrations ranging from 14 <br /> parts per billion volume (ppbv) to 24 ppbv, significantly less than the 350 ppbv cleanup <br /> standard specified in the ROD. The presence of residual contaminants in soil above the <br /> ROD cleanup level for TPH-d and detections of TCE in EW-011 prompted the regulatory <br /> team to recommend Institutional Controls for SWMU 20. <br /> Institutional Controls for SWMU 20, are identical to those listed above for SWMU 6 and <br /> are specified in section 2.0 of the Final ESD to the Sitewide Comprehensive ROD. The <br /> existing LUCs, future industrial use of the site, and ongoing ground water <br /> monitoring/treatment will ensure the long-term effectiveness of the remedy and will <br /> protect human health and environment well into the future. <br /> Erata <br /> 1.) Page 1-2, section 1.3.1, second paragraph, first sentence: Please correct the <br /> misspelling of "sump." <br /> 2.) Table 10-1, Regional Water Quality Control Board Contact: Please list the new <br /> phone number for Mr. Marcus Pierce as (916) 464-4733. <br /> Conclusion <br /> DTSC concurs with the determinations presented in the Draft Final Remedial Action <br /> Report for SWMU 6 and 20 Small Excavation Sites, and SWMU 4 Wet Season <br /> Controls. <br /> If you have any questions or comments regarding this letter, please feel free to contact <br /> the Project Manager, Mr. Peter MacNicholl at (916) 255-3713 or e-mail <br /> Pmacnich andtsc.ca.aov. <br /> Sincerely, <br /> Anthony J. Landis, P.E. <br /> Chief <br /> Northern California Operations <br /> Office of Military Facilities <br /> cc: See next page. <br />