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STATE OF CALIFORNIA-Environmental Prt m Agency _ PETE WILSON Govemor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION _ : r s:; I_TH <br /> 3443 Routier Road,Suite A <br /> Sacramento,CA 95827-3098 --- <br /> PHONE:(916)255-3000 96 AUG 2S Pry 3: 5 <br /> FAX:(916)255-3015 v <br /> 23 August 1996 <br /> Mr. Randy Smith <br /> Southern Pacific Transportation Company <br /> One Market Plaza <br /> San Francisco, CA 94105 <br /> LEAD CONTAMINATED SOIL REMEDIATION, SOUTHERN PACIFIC <br /> TRANSPORTATION COMPANY, OLD TRACY YARD, SAN JOAQUIN COUNTY <br /> I have reviewed the 9 August 1996 report entitled Remediation of Lead-Impacted Soil prepared <br /> by Terranext for Southern Pacific Transportation Company's (SPTCo) old Tracy rail yard. The <br /> report documents the sampling data obtained following the excavation and disposal or treatment <br /> of more than 35,000 cubic yards of lead-contaminated soil. SPTCo has proposed continued <br /> ground water monitoring at the site for three quarters with no further soil remedial action. <br /> Based on the confirmation sampling of the excavations for soluble lead, the remaining soil <br /> contamination probably does not pose a threat to water quality. This conclusion will be <br /> confirmed with three additional quarters of ground water sampling from two existing wells and <br /> four new wells. The remaining, limited high concentrations of total lead (up to 5,870 mg/kg was <br /> found and left in one location) may be a health concern depending upon the future use of the <br /> property. A preliminary health-based cleanup level of 220 mg/kg was established by the <br /> Department of Toxic Substances Control based on eventual residential use. <br /> Based on the above information, no further action is required except for submittal of quarterly <br /> ground water monitoring reports by 30 September 1996, 31 December 1996 and 30 March <br /> 1997. After we review those reports and if they show little or no water quality degradation, we <br /> will provide a final determination for no further action. <br /> If you have any questions, you may call me at(916) 255-3077. <br /> J L M. WEISS <br /> Engineering Geologist <br /> JMW:jmw/lsb <br /> cc: Mr. Eric Garcia, Department of Toxic Substances Control, Sacramento <br /> San Joaquin County Department of Public Health Services, Stockton <br /> Mr. Dick Bateman, Terranext, Sacramento <br />