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extraction volumes, and parameters are included on the field purging and sampling form included <br /> in Appendix A. The wells were allowed to recharge to at least 80% of their respective static water <br /> levels prior to sample collection_ The 300 gallons of purged water was taken to Riverbank Oil <br /> Transfer under Uniform Hazardous Waste Manifest number 21658809 by American Valley Waste <br /> Oil, Inc. A copy of the signed bill of lading is included in Appendix C. <br /> The samples were recovered using clean, disposable bailers, and were then transferred into 40-m1. <br /> VOA vials. All samples were labeled, placed in an ice chest, chilled with ice to 4° C, and <br /> transported to Precision Enviro-tech Analytical Laboratory (an ELAP-certified laboratory in <br /> Stockton, California) for analysis using appropriate chain-of-custody procedures. <br /> The results of all current and previous groundwater gaugings are summarized in Table 1. The <br /> average depth-to-water on May 16, 2002 was 11.23 feet below the top of the casing elevation of <br /> the three project monitoring wells. At that time, the local direction of groundwater flow <br /> (utilizing elevation data from the monitoring wells) was calculated at approximately North 80° <br /> West along a gradient of 0.00249 foot/foot (equivalent to 2.49 feet of dip per 1000 feet of <br /> horizontal distance) (see Figure 2). <br /> TABLE 1 <br /> HISTORICAL GROUNDWATER SOUNDING DATA <br /> Port of Stock#on Former UST Site No.3, San Joaquin County <br /> well Date Depth To Casing Top Water Table <br /> Avg.Flow Direction: . <br /> Number Sounded Water(Ft) Elevation(Ft) Elevation(Ft) &Gradient.(Ft/Ft) <br /> From"Casio <br /> MW3-1 07/09/99 11.10 9.35 -1.75 East Northeast <br /> @ 0.004 ft/ft <br /> 10/22/99 11.40 -2.05 North 40°degrees west <br /> @ 0.024ft/ft <br /> 02/08/00 10.99 -1.64 North 16°degrees east <br /> @ 0.008ft/ft <br /> 05/17/00 10.08 -0.73 East 22°degrees south <br /> @ 0.012ft/ft <br /> 09/14/00 11.75 -2.40 South 6°degrees east <br /> @0.014-ft/ft <br /> 02/14/01 11.29 -194 South 22°degrees west <br /> @0.035f/ft <br /> 5/17/01 10.77 -1.42 North 17.3°degrees <br /> west @ 0.0028 ft/ft <br /> 08/22/01 12.55 -3.20 West 32°degrees south <br /> @ 0.0044 f}Ift <br /> 11/19/01 12.86 -3.51 West 46.7°degrees <br /> south @ 0.0051 ft/ft <br /> 2119102 10.96 -1.61 North 9.2°degrees east <br /> @ 0.00323 ff/ft <br /> 5116/02 11.44 -2.09 North 800 degrees west <br /> 0.00249 ft/ft <br /> 11th qtr um skO.doc 5 <br />