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TATE OF CALIFORNIA • • GEORGE DEUKMEJIAN, Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD, SUITE A 9 � <br /> SACRAMENTO, CA 95827-3098 <br /> 24 July 1990 JUL 2 6 <br /> ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> Mr. Marshall Cloud <br /> Office Installation Services <br /> Defense Depot Tracy <br /> Tracy, CA 95376-5000 <br /> UNDERGROUND TANK AT BUILDING 201, DEFENSE DEPOT TRACY, SAN JOAQUIN COUNTY <br /> John Tomko of my staff has reviewed the Statement of Work (SOW) for the <br /> remediation of the underground storage tank site at Building 201 . The strategy <br /> to assess and remediate this site, as proposed in this SOW, appears satisfactory. <br /> John discussed with you an alternative remediation strategy at a 17 July 1990 <br /> RI/FS progress review meeting, that you may want to consider if time is critical . <br /> This strategy includes the excavation of contaminated soils to a predetermined <br /> cleanup level , confirmation soil sampling, and the management of the excavated <br /> contaminated soils. <br /> To assist you in determining cleanup levels and soil management options I've <br /> enclosed a Regional Board memorandum, dated 15 August 1986, regarding the waste <br /> classification of, and suggested management options for, fuel contaminated soils. <br /> This memorandum indicates that diesel contaminated soils may be classified as <br /> designated wastes or as unclassified wastes depending on their threat to water <br /> quality. <br /> Cleanup levels and suggested management options vary depending upon the <br /> contaminated soil 's waste classification. Hence, I've also enclosed a report <br /> entitled "The Designated Level Methodology For Waste Classification and Cleanup <br /> Level Determination" that Sulilmdr IZBS ale dcS1grla6 U 1cVcl methodology. if yaU <br /> wish to receive a copy of the full report, contact John Tomko. <br /> If the contaminated soils are not, or cannot be, excavated to non-designated <br /> waste levels, than the follow-up RI/FS program, pertaining to the assessment and <br /> remediation of the Depot's underground storage tanks, must include an assessment <br /> of the water quality risks associated with this residual soil contamination. <br /> The preferred management option for excavated diesel contaminated soils is onsite <br /> treatment either by landfarming, soil aeration, or soil venting. If either of <br /> these options are implemented we require that a facility description, including <br /> site plan, be submitted that demonstrates that the facility will not impair <br /> surface and/or ground waters. In addition, the local Air Pollution Control <br /> District, should be consulted regarding emissions from the soil treatment <br /> facility. <br />