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STATE OF CALIFORNIA—ENVIRONMENTAL PR ION AGENCY PETE WILSON, Govsrnor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— �4�Of <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD, SUITE A <br /> SACRAMENTO, CA 95827-3098fa <br /> PHONE: (916) 255-3000 "0u"�'"`' <br /> FAX: (916) 255-3015 <br /> 25 February 1993 RECEIVED <br /> MAN <br /> ENV <br /> Mr. Leon Brasowski j T. T, <br /> Manager, Environmental Permitting <br /> Ogden Martin Systems,Inc. <br /> 40 Lane Road <br /> P. O. Box 2615 <br /> Fairfield,New Jersey 07007-2615 <br /> STOCKTON SOILS TREATMENT FACILITY— <br /> CONTAMINATED SOIL WASTE PILE REMOVAL CONFIRMATION SAMPLING <br /> I have reviewed the report, Stockton Soils Treatment Facility: Soil Confirmation Sampling, <br /> submitted under your cover letter of 23 June 1992. The work described in this report was <br /> performed to determine the adequacy of soil removal beneath the former petroleum- <br /> hydrocarbon-contaminated soil stockpile. Review of this report had been postponed, <br /> pending submittal of a complete Report of Waste Discharge for the establishment of a <br /> new Class H waste pile for storage of petroleum contaminated soils on the location of the <br /> former soil stockpile. As you explained on 23 December 1992,Ogden does not now plan <br /> to pursue waste discharge requirements for the establishment of a new waste pile at your <br /> Stockton facility, and does not intend future use of the site as a soils treatment facility. <br /> Work performed by Ogden's consultants in 1992 included removal of contaminated soils <br /> stored in the stockpile, removal of the stockpile's liner and leachate collection system, and <br /> removal of visually contaminated soils beneath the liner. Your confirmation sampling <br /> report contains data indicating that no petroleum hydrocarbons in the gasoline or diesel <br /> ranges remain in soils beneath the former stockpile. Metallic constituents in these soils do <br /> not appear to be elevated above those in background soil samples taken from an area <br /> removed from the stockpile. Seven out of 26 samples from beneath the stockpile <br /> contained hydrocarbon contaminants of chain lengths larger than the diesel range and in <br /> concentrations ranging from 60 to 220 mg/kg. These heavy hydrocarbons were also <br /> found in the two background soil samples,indicating that these contaminants likely <br /> represent oil and grease contamination from industrial activities at the site,but not <br /> necessarily related Ogden's operations. The Ogden site is in an industrial area where <br /> such contamination may be common. Petroleum hydrocarbons heavier than the diesel <br /> range are generally considered not to pose a significant threat to ground water quality in <br /> the concentrations found at the Ogden site, due to their limited mobility in soils. <br /> Based on your soil confirmation sampling report,it appears that sufficient soils have been <br /> excavated from beneath the former soil stockpile to eliminate a threat to ground water. <br /> Therefore, sampling proposed in your 12 January 1993 submittal does not appear to be <br />