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GEOSYNTEC CONSULTANTS <br /> Ms. Amy Terrell <br /> 25 August 2003 <br /> Page 3 <br /> summary table and figure indicating sample locations from the excavation sampling are <br /> included as Attachment B. <br /> SUMMARY OF SITE GROUNDWATER AND SOIL CONDITIONS <br /> The WFS Vernalis groundwater monitoring well network consists of six <br /> groundwater monitoring wells installed between 1996 and 2002 at the locations shown <br /> on Figure 2. Water levels and water quality have been monitored periodically since the <br /> wells were installed. Depth to the first-encountered groundwater at the site is between <br /> 30 and 35 feet below ground surface. The groundwater flow direction is predominantly <br /> to the east,with occasional fluctuations to the north and south. <br /> The uppermost soils at the site (0 to 30 ft below ground surface [bgs]) are <br /> predominately clays with some sand and gravel at and slightly above the water table. <br /> CORRECTIVE ACTION APPROACH <br /> The objective of this Work Plan is present a plan for addressing soils in the area of <br /> the former tank farm where nitrogen in the form of nitrate and ammonia/ammonium are <br /> present. In the process of developing this Work Plan, a number of possible corrective <br /> actions for nitrogen in soil were considered, primarily: phytoremediation in which the <br /> soil nitrogen would be used by plants or trees; excavation followed by treatment or <br /> disposal; and bioremediation in various forms. In selecting one approach, we <br /> considered a number of factors including: <br /> ■ the routine operations at the site; <br /> ■ the nature of the unsaturated soils; <br /> ■ cost; <br /> ■ applicability of the technology to reduce residual nitrogen in soil; and, <br /> PAPRJ2003REM\WFS\VER\Soil Plan 2003\RAP-Soil8-M.doc <br /> RECVaMAW �j �� <br />