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110112/1998 16:09 9165350207 APEX ENVIROTECH PAGE 06 WOrkplaft for Pilot TCd rued Feasibility Anatysis Colbarg Boat Works,401`N Stockton St.,Stockton,Califoz*a Pap 2 SubsquentlY,Colberg Beat Works was directed by the San Joaquin County Environmental Health Division(SICEHD)to per�nn further investigations at the site. Apex proposed additional subsurface investigation and groundwater monitoring installation at the site. The Proposed work was documented by Apex in Workplanfor LimiledSubsurface Itivestigatior,and WarAplan Addendum far Limited Subsurface Imestigation,dated May 2, 1995 and January 24, 1997,respectively, On July 28, 1997,Apex personnel supervised the drilling of six sod borings,and converting the borings into six groundwater monitoring wells(Figure 2,MWA through MW-6)at the site. The results of the work were documented by Apex in Results of Subsurface Invesligatiory, dated August 21, 1997. In April 1998, Apex submitted a closure request for the former diesel tank location,which is on the west side of the subject site area and also recommended discontinuing analyses for oxygenate constituents with the exception of MT13E in wells MW-1,MW-2 and MW-3. Apex further recommended discontinuing analyses for TPHd in wells MW-1,MW.2 and MW-3. GEOLOGY AND HYDROGEOLOGY The subject sites situated in-the-northern portion of the San Joaquin Valley sub-basin of the Cvmt Valley geomorphic province. The Great Valley is an asymmetrical synclinal trough with its axis off center to the west. In the Stockton area,it is interrupted by the Stockton Fault in the Stockton Arch. The regional geology consists chiefly of various alluvial marine and non-marine sediments of the Quaternary and upper Tertiary age. The Stockton Arch exposes upper Cretaceous marine sediments just south ofthe Stockton Fault. The Stockton Fault is an east-west trending normal fault,with the southern block upthrown. The site lies on the Stockton Deep Water Channel of the San Joaquin River, which borders the southern portion of the site. The Stockton Deep Water Channel allows access to the Port of Stockton by sea going ships. Portions of the Colberg Boat Works property are subject to intermittent flooding as water levels change in the San Joaquin River and the Stockton Deep Water Channel. Annual rainfall in the Stockton area averages about 20 inches. PILOT TESTING AND FEASIBILITY ANALYSIS The following is a discussion of the activities to be completed for the Pilot Testing and Feasibility Analysis. All of the tasks are subject to regulatory agency review and approval. TB:DAApxNPr*jectslPrqjem\CW)Mo1-001%F=zibffityWorkp1am&c