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i IH 2Z DI It: 50 HUr1 T T 210 P02 <br /> s <br /> Geological Audit Services, Inc. <br /> VK-As1803 W March Lane Suite A- StOGK10n, CA 95207• (209)956 0264 • FAX (209)958-0700 <br /> SOIL EXCAVATION AND REMEDIATION WORKPLAN <br /> Mid Cal Leasing <br /> SITE PESCRIFTION <br /> The site is located in a flat commercial/residential area in <br /> central Stockton (Figure 1 - Location Map, 7. 5 Minute Stockton West <br /> Quadrangle, USGS Topographic Map Series, 1976) . The facility <br /> consists of a large empty garage and adjoining storage rooTas and <br /> exterior fenced storage areas. <br /> The site is underlain by unconsolidated Quaternary alluvial <br /> sediment. Groundwater is estimated at 64 ft below surface grade <br /> (San Joaquin County Flood Control and Water Conservation Distract, <br /> Map showing lines of equal depth to water wells, Fall, 1989) . <br /> PREVIOUS WORK <br /> An underground waste oil tank a the aro a was <br /> Thor ar 1989. <br /> The tank cavity is approximately 5 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 sail was <br /> reemplaced in the tank cavity. <br /> PROPOSED EXCAVATION AND SAMPLING <br /> We propose 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 wit. <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 Division <br /> (SJEHD) 48 hours prlo3r to work initiation. <br /> 3) overexcavate the tank cavy y to <br /> te <br /> dimensions: to ft long x 8 ft wide xe following <br /> PP <br /> (2tobeyond <br /> the existing excavation and 5 ft below present depth. ) <br /> Er v rorui*mal Services - Hydrogeolocgy ,Geotechnical Services <br />