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CASE CLOSURE SUMMARY <br />Former City of Santa Ana City Yard, Santa Ana <br />DEL EASE anln RITF CHAPArTFR17ATInN INFORMATION <br />October 8, 1999 <br />Page 2 <br />Cause & tyLof ease: In 1969, a 10,000 - gallon <br />leade d gask was damaged and <br />replaced. In <br />1986, pipinpaired for the leaded <br />gasoline and <br />diesel tank88, the fill port to the <br />12,000- gallon <br />gasoline Ueaking and subsequently repaired. <br />Site Characterization Complete:YES [x <br />] NO [ ] <br />Date approved by oversight agency: <br />Regional Board <br />Monitoring Wells Installed: Yes <br />Proper screened interval: YES [x ] <br />NO [ j <br />Highest GW depth below ground surface: <br />Lowest depth: Approximately 11 feet <br />bgs <br />Approximately 5 feet bgs <br />Flow Direction: Southerly <br />Nearestlaffected SW name: N/A <br />Most sensitive current GW use: MUN <br />Off -site beneficial use impacts: N/A <br />Groundwater Basin: Santa Ana Pressure <br />Reports(s) filed: California Regional <br />Water Quality Control <br />Board ( <br />Yes) <br />3737 Main Street, Suite 500, Riverside, <br />CA 92501 -3339 <br />Report(s) on file? Yes <br />TREATMENT AND DISPOSAL OF AFFECTED MATERIAL <br />MATERIAL <br />AMOUNT <br />ACTION TREATMENT OR DISPOSAL <br />DATE <br />W /DESTINATION <br />TANKS & <br />Nine (9) USTs and <br />Removed and transported to Erickson, Inc., <br />July 6 -18, 1995 <br />PIPING <br />associated piping <br />Fontana, Crosby & Overton, Long Beach, and <br />American Metal Recycling, Ontario <br />ASBESTOS <br />5,910 square feet <br />Under SCAQMD permit, asbestos was removed <br />January 12, 1996 — <br />and transported by Vision Environmental to BKK <br />January 22, 1996 <br />Landfill, West Covina. <br />Unknown <br />Excavation pit approximately 15' long, 7' wide and <br />5' deep, deepening to 10' feet deep at the east <br />August 1985 <br />SOIL <br />side. Amount removed unknown. <br />3,104.65 tons <br />Petroleum hydrocarbon- contaminated soil was <br />May 23 through June 4, <br />excavated from the former UST excavation area <br />1997 <br />and transported by Dispatch Trucking to <br />Landmark Materials in Irwindale, California, for <br />disposal. <br />Petroleum hydrocarbon- contaminated soil was <br />August 15 and 18, 1997 <br />1,564.94 tons <br />excavated from the former UST excavation area <br />and transported by Dispatch Trucking to <br />Landmark Materials in Irwindale, California, for <br />disposal. <br />Petroleum hydrocarbon- contaminated soil was <br />August 17, 1999 <br />191.13 tons <br />excavated from the former waste oil tanks (2) <br />excavation area and transported by W.A. Woods <br />Industries, Inc. to Thermal Remediation Solutions <br />in Azusa, California, for disposal. <br />