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envirosP <br /> Site Description <br /> The site is located on the southwest comer of the intersection of Fremont Street and Filbert <br /> Street(Plate 2). Presently,there are four gasoline USTs located on-site; 2-8,000 gallon <br /> capacity tanks and 2-5,000 gallon capacity tanks. The locations of these USTs are shown <br /> on the attached Site Plan. These four tanks and associated piping will be removed. Two <br /> new gasoline USTs and associated new piping will be installed (Plate 2). <br /> The tank removal project is scheduled to begin April 22, 1996. An Application for <br /> Underground Storage Tank Closure Permit has been completed (Attached). Plans have <br /> been submitted and approved by San Joaquin County. <br /> Scope of Work <br /> The proposed scope of work is summarized in the following tasks. <br /> Task 1 - Soil and Groundwater Sampling During Tank Removals <br /> No data documenting subsurface conditions were made available to Enviros for the subject <br /> site. Soil samples will be collected from beneath the USTs per Tri-Regional Guidelines. If <br /> ground water is encountered in the tank pit during UST removal activities, one water <br /> sample will be collected from the excavation pit for chemical analysis. <br /> Task 2- Piping Trench Sampling <br /> Piping associated with the existing four gasoline USTs will be removed. One soil sample <br /> will be collected from piping trenches for every 20 lineal feet of piping. <br /> Task 3 - Chemical Analysis of Soil and Groundwater Samples <br /> Soil and water samples collected from the tank and piping excavations will be sent to a state <br /> of California certified laboratory for chemical analysis for Total Petroleum Hydrocarbons <br /> calculated as Gasoline (TPH-G) according to EPA Method 8015 (Modified),Benzene, <br /> Toluene, Ethylbenzene and Xylenes (BTEX) compounds according to EPA Method 8020, <br /> Total Lead according to EPA Method 7421 and MTBE according to EPA Method 8020. <br /> Chemical analytical results will be requested on a 24-hour turnaround time frame to <br /> expedite this project. <br /> Task 4 -Over-excavation <br /> Based on the results of soil sample analyses from the tank pit and piping trenches, over- <br /> excavation of soils may be performed. An Enviros geologist will be on-site to observe <br /> field conditions and direct the excavation contractor in the removal of soils, and document <br /> field observations, if necessary. The field geologist will screen excavated soils and <br /> stockpile soils appropriately based on field observations. <br /> The extent of over-excavation (if performed) around the peripheral edge of the tank pit and <br /> along piping trenches will be determined in the field by the Enviros geologist. Over- <br /> excavation will be performed in areas as warranted based on visual observations and/or <br /> 96370 2 <br />