ARCHIVED REPORTS_XR0005829 CASE 1

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Mr Michael Infurna Project 20805-151-004 August 25, 2000 Page 7 Soil Stockpile Samples Six of the 18 stockpile samples contained concentrations of TPHG ranging from 2 54 mg/kg to 340 mg/kg TBA was detected in three of the ' 11 samples analyzed at concentrations ranging from 0 22 mg/kg to 0 46 mg/kg and MTBE was detected in three of the 14 samples analyzed at concentrations ranging from 0 011 mg/kg to 0 32 mg/kg Total lead was detected 1n samples SP-2 (collected on ' 4/21/99), SP-1, and SP-4 at concentrations of 114 mg/kg, 5 mg/kg, and 8 mg/kg, respectively Certified analytical reports and chain-of-custody documentation are presented in Appendix B ' CONCLUSIONS Three fiberglass USTs (two 12,000-gallon gasoline USTs and one 10,000-gallon gasoline UST) were removed from the site on April 29, 1999, and replaced with two new 15,000-gallon gasoline USTs and one new 12,000-gallon gasoline UST The USTs were transported by Fuller Excavation and Demo to Erickson of Richmond, California, for disposal Impacted stockpiled soil was transported by Dillard Trucking to Browning Ferris Industries Vasco Road Sanitary Landfill for disposal Four 4-inch-diameter observation wells were removed intact during the excavation activities The observation wells were replaced with two new 4-inch-diameter Iobservation wells located in the northeast and southwest corners of the new UST complex ' Concentrations of MTBE remaining in soil at the bases of the UST excavations range from 0 012 mg/kg to 20 8 mg/kg Residual benzene and TBA were detected at concentrations of 0 0733 mg/kg (sample T-3-N at 17 feet bgs) and 23 2 mg/kg (sample LT-2-N at 17 feet bgs), respectively No residual MTBE remains beneath the former product lines Residual TPHG and benzene remains beneath sample location PL-6 at concentrations of 2 1 mg/kg and 0 0066 mg/kg, respectively ' Residual MTBE remaining in soil beneath former dispenser location D-6 was detected at a concentration of 0 204 mg/kg Residual TPHG concentrations range from 36 mg/kg to 1,430 mg/kg Groundwater encountered at the base (17 feet bgs) of the northern UST excavation was not sampled SAC\\\SACRFPI\COMMON\Consulting\data\Sharcd\Projects\P10\0805\08051510 4zz doe-Mit 1 (804141 00008)