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MHYc_ Zi1 1 �aU ��—uEULUUll_HL HUC,[r----��==-�--- —�- --- 210 F02 <br /> r <br /> 7--,om <br /> Geological Audit Services, Inc. <br /> 1803 W Match Lane,Suite A•Stockton,CA 95207•(209)956-0264-FAX(209)956-070[3 <br /> SOTL EXCAVATION AND REMEDIATION WORKPLAN <br /> Mid Cal -,easing <br /> SITE DESCRIPTION <br /> The site is located in a Plat 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 rooms and <br /> exterior fenced storage areas. <br /> The site is underlain by unconsolidated Quaternary alluvial <br /> sediment. Groundwater is estimated at 60 ft below surface grade <br /> (San Joaquin County Flood Control and Water Conservation District, <br /> Map showing lines of equal depth to water wells, Fall,- 1989) . <br /> PREVIOUS w0F; <br /> An under,rotind waste oil tan i <br /> de$the garage was remoyed_b <br /> Thorpe of 89 . camucd om beto� <br /> �; <br /> dank-mat - a tsl�"� _ =r _grade v Yi <br /> l�hs _ P'pr, ama y -5-6�� !t'��ie..ew � and��atnal, zed�b <br /> ,tennis Environmental for t0��c� as oj?lg, .. -h,7r_d ambo <br /> n &X " _ ifrTa`i i Zee re ease ot^hydxocasbonm_was a sc e , <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 propose to mLtigate the contamination at the site through <br /> excavation and subsequent treatment on-site by means of <br /> biodegradation. The remediation will be undertaxen in the following <br /> steps: <br /> ]1) Prapare a site health and safety plan in accordance with <br /> occupational Safety and Health Guidance Manual for hazardous <br /> Waste Site, Activities - Prepared by NacLonal Institute for <br /> occupational Safety and Health, Occupatxoial Saf sty 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 D1viS3.on <br /> (SJEND) 48 hours prior to work initiation. <br /> t 3) Overexcavate the tank cavity to the following approximate <br /> dimensions: 10 ft long x 8 ft gide x 9 ft deep (2 ft beyond <br /> the existing excavation and 5 ft below present depth. ) <br /> EmnronrYmen&Services•Hyd%r geolWY•Geotechnical Services <br />