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RE's <br /> MAY 2 <br /> IRONMENI P� <br /> SOIL EXCAVATION AND REMEDIATION WORKP�� � ���� y�� �, <br /> Mid Cal Leasing <br /> SITZ DESCRIPTION <br /> The site is located iT, a flat commercial/residential area in <br /> central Stockton (Figure 1 - Location Map, 7 .5 Minute Stockton West <br /> Quadrangle, USGS Topographic <br /> and adeo�ning7storage roomsland <br /> consists of a large empty g 7 <br /> exterior fenced storage areas. <br /> T ,e site is underlain by unconsolidated Quaternary .11luvial <br /> sediment. Groundwater is estimated at 60 ft below surface grade <br /> (San Jcaquin County Flood Control and water Conservation District, <br /> Map showing lines of equal depth to water wells, Fall, 1989) . <br /> PREVIOUS WORK <br /> An underground waste oil tank inside the garage was removed by <br /> Thorpe Oil in January, 1989. A soil sample was collected from below <br /> the tank at approximately 5-6 ft below grade and analyzed by <br /> Canonie Environmental for total extractable petroleum hydrocarbons <br /> and BTE&X. An unauthorized release of hydrocarbons was detected, <br /> ,eith ,a concentration of 8500 mg/kg (ppm) TPH. BTE&X compounds were <br /> ND at 20. TPH values may have dropped somewhat in the two years <br /> since the tank was excavated. <br /> The tank cavity is approximately 6 ft long x 4 ft wide x 4 ft <br /> deep. Approximately 3.5 cu. yds. of contaminated soil were removed <br /> during the excavation. Following excavation, this soil was <br /> reemplaced in the tank cavity. <br /> PROPOSED EXCAVATION AND SAMPLING <br /> We prop+c.se to mitigate the contamination at the site through <br /> excavation and subsequent treatment on-site by means of <br /> biodegradation. The remediation will be undertaken in the following <br /> steps: <br /> 1) Prepare a site health and safety plan in accordance with <br /> Occupational Safety and Health Guidance Manual for Hazardous <br /> Waste Site Activities - Prepared by National institute for <br /> Occupational Safety and Health, Occupational Safety and Health <br /> Administration, U.S. Coast Guard and US Environmental <br /> Protection Agency, October 1985. <br /> 2) Notify the San Joaquin County - Environmental Health DiviFion <br /> (SJEHD) 48 hours prior to work initiation. <br /> 3) Ovexexcavate the tank cavity to the following approximate <br /> dimensions: 10 ft long x 8 ft wide x 9 ft deep (2 ft beyon,' <br /> the existing excavation and 5 ft below present depth. ) <br /> 2 <br />