Laserfiche WebLink
site would be remediated by excavation and off-site disposal of lead-impacted soil. <br /> Confirmation samples would be collected from excavation sidewalls and floors and analyzed <br /> i for total lead to document successful completion of remediation. This workplan was <br /> approved by the Regional Board in a letter to SPTCo dated January 6, 1995. The only <br /> additional condition imposed (telephone discussion on January 13, 1995) was a "tentative <br /> designated level" (goal but not requirement) of 0.015 milligrams per liter (mg/L) for soluble <br /> lead in soil based on the California waste extraction test [WET] using a deionized water <br />..s leach. Subsequent to workplan approval by the Regional Board, a soil cleanup level of 220 <br />•—� mg/kg total lead was required by the DTSC (letter from DTSC to SPTCo dated June 15, <br /> 1995) for residential development/use of the site. <br />■� Based on site characterization data available at the time, the 220 mg/kg cleanup level for <br /> total lead, and the 0.015 mg/L cleanup goal for soluble lead, it was initially estimated that <br /> slightly in excess of 2,400 cubic yards (cy) of impacted soil would need to be excavated and <br /> transported for off-site disposal. Excavation of site soil with total lead concentration in <br /> excess of the established cleanup level was initiated in July 1995. Excavation, confirmation <br /> sampling, and disposal activities continued intermittently until early January 1996, by which <br /> time an estimated 25,500 cy of impacted soil had been excavated and stockpiled and <br /> approximately 10,000 cy had been transported by rail for off-site disposal at the East Carbon <br /> Development Corporation (ECDC) landfill in Utah. <br /> Additional soil characterization data collected in January 1996 indicated that a significant <br /> volume of impacted soil would still need to be excavated if the 220 mg/kg cleanup level were <br /> to be achieved for the entire site. Based on this information, SPTCo decided to cancel the <br /> planned sale of the parcel and modify the soil remediation program. A modified soil <br /> remediation program was submitted to the Regional Board in a letter dated February 15, <br /> L 1996. The modified soil remediation program involved on-site treatment of the excavated <br /> soil stockpiled on site (estimated to be about 15,500 cy) to immobilize the lead and thus <br /> 369-002.rpd08-09-96/u/keydaca/oldtracy/reports/rpE002 3 <br /> TerraNext <br />