Laserfiche WebLink
4. <br /> Department of Toxic Substances Controld ; <br /> Terry Tamminen 8800 Cal Center Drive Arnold Schwarzenegger <br /> Agency Secretary Sacramento, California 95826-3200 Governor <br /> Cal/EPA ((�� �ry�,�J lEV� <br /> August 6, 2004 U11L�CE v <br /> AUG 10 2004 <br /> Mr. Marshall Cloud ENVIRONMENT R HEALTH <br /> Remedial Project Manager <br /> ICES <br /> Environmental Office <br /> Post Office Box 960001 <br /> Stockton, California 95296-0250 <br /> CONCURRENCE WITH THE DRAFT FINAL REMEDIAL ACTION REPORT FOR THE <br /> NORTHERN DEPOT AREA DEFENSE SITE ENVIRONMENTAL REPORTING AND <br /> TRACKING SYSTEM (DSERTS) 67 COVER INSTALLATION FOR DEFENSE <br /> DISTRIBUTION DEPOT SAN JOAQUIN CALIFORNIA (DDJC)-TRACY SITE, TRACY, <br /> CALIFORNIA <br /> Dear Mr. Cloud: <br /> The Department of Toxic Substances Control (DTSC) received the above-mentioned <br /> report on June 29, 2004. The report discusses the post Record of Decision (ROD) <br /> remedial action activities related to DSERTS 67. <br /> History <br /> DSERTS 67 site was used as a storage area for the National Stockpile of Strategic <br /> Metals between the early 1940s and mid 1980s. This site was used to store ferrous <br /> chromium ore until the 1980s, and was used to store lead ballast until 1986. <br /> Manganese ore was also stored at DSERTS 67 until the 1970s. <br /> Remedial Actions <br /> The selected remedy in the ROD was to construct an asphalt cap approximately <br /> 138,000 square feet for the protection of onsite workers; specifically, to protect grader <br /> operators from elevated levels of arsenic and manganese in dust. On July 22, 1999, a <br /> DDJC-Tracy Remedial Project Managers meeting concluded that the ROD-required <br /> asphalt cover was overly conservative based on future land use and limited exposure <br /> scenarios of grader operators and onsite workers. Alternative remedies were evaluated <br /> and an Aggregate Base (AB) cover was selected as an equivalent ROD-required <br /> remedy. A design data collection effort was conducted in 2001 to define the lateral <br /> 0 Printed on Recycled Paper <br />