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3- 13- 1996 9 : S6AM FROM GOVERNMENT-BUILDINGS 209+d683363 P . 3 <br /> EXCAVATION will be performed. Samples from beneath the tank will be <br /> collected for evaluation by PHS/EHD Site Mitigation Unit. Because of previous <br /> investigative findings have documented contamination at 18-20 feet bgs, sample <br /> analyses may be held at the laboratory pending disposition. <br /> The tank void will be backfilled and compacted with clean native soil , no pea <br /> gravel . Contractor shall remove, transport and dispose of the two tanks. <br /> Contractor shall also transport and dispose of any contaminated soil. Contractor <br /> shall repair damage to sidewalk and building. Sidewalk specifications attached. <br /> Contractor shall prepare and submit a Tank Closure Report to PHS/EHD and copy <br /> County. <br /> I Two(2) soil samples shall be collected from each tank end at the bottom of the <br /> tank' s contact with native soil. Samples from the pipeline line trench will not be <br /> collected at the time of their removal. <br /> Soil Analysis: <br /> BTX & E EPA Method 8020 (5030) <br /> Detection limit .005 ppm (mg/kg) <br /> Total Petroleum Hydrocarbons, Gasoline CC-FID EPA Method 8015 <br /> (5030) <br /> Detection limit 10.0 ppm (mg/kg) <br /> SITE 2: Canlis Administration Building <br /> 24 S . Hunter Street, Stockton <br /> History: Site contains one single wall 10,000 gallon fiberglass former diesel tank and <br /> related piping to provide fuel to an emergency generator for the building. Special <br /> precautionary measures may be necessary due to the position of the tank relative <br /> to the building, approximately five feet, and the City of Stockton' s sidewalk, less <br /> than five feet. In 1990, the County applied for a UST removal permit, but, <br /> discovered that structural damage to the building may occur if removed. In 1992, <br /> five(5) borings including a angle boring were completed to assess the soil for the <br /> presence of petroleum hydrocarbons. Results indicated that soil at the southwest <br /> comer of the tank, at 25.5 feet bgs was impacted by hydrocarbons (690 ppm TPH- <br /> diesel) . <br /> Project Tasks: <br /> One: Prepare and submit to proper agencies a Tank Removal plan and obtain necessary <br /> permits to remove the 10,000 gallon fiberglass tank. Backfill and compact tank <br /> 2 <br />