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GE GENESIS ENGINEERING & REDEVELOPMENT bgs. At each of these depth intervals, and at the bottom of each borehole a reconnaissance groundwater sample will be collected. The drilling and sampling procedures are discussed in Appendix A. The soil and reconnaissance groundwater samples will be tested for nitrate using EPA Method 300.1 and ammonia using EPA Method E350.1. Selected depth-discrete soil samples will be tested for vertical permeability using ASTM Method D5084. 2.3 Task 3—Shallow Water Bearing Unit Aquifer Test Well One shallow aquifer test well will be installed at the location shown on Figure 3. Based on the well construction log for the on-site water supply well, the base of the upper-most saturated unit is 60 feet bgs. The test well will be installed to the base of the upper-most saturated unit. The continuous soil cores from each boring will be logged for soil type. Soil samples will be collected for chemical analysis at 5 foot depth intervals (1 foot, 5feet, 10 feet, 15 feet, 20 feet, 25 feet, 30 feet, 35 feet, 40 feet, 45 feet, 50 feet, 55 feet, and 60 feet). The borehole will be converted into a 6-inch diameter monitoring well, with a well screen interval extending from 40 feet to 60 feet bgs. The size of the well screen slots will be determined based on subsurface material encountered at this location. Upon completion of construction of the monitoring well, it will be developed using surge and bail and pumping techniques. Following well development, the monitoring wells will be purged and groundwater samples collected. The drilling and sampling procedures are discussed in Appendix A of the Work Plan. The soil and groundwater samples will be tested for nitrate using EPA Method 300.1 and ammonia using EPA Method E350.1. 2.4 Task 4—Aquifer Test A 24-72 hour aquifer test will be conducted in the shallow water bearing unit to assess hydraulic properties in this unit. Three existing shallow monitoring wells near the aquifer test well will be used as observation wells. It is anticipated that the aquifer test will last from 24 to 72 hours. Data will be interpreted after 24 hours to assess if sufficient information has been generated to interpret aquifer properties. If additional data are required,the test will be extended in 24 hour blocks until a maximum of 72 hours has elapsed. After completion of the drawdown,the system will be allowed to equilibrate and groundwater levels monitored in the observation wells. Specific procedures to be used to conduct the aquifer test are presented in Appendix D. Ripon Farm Services 5 of 7 Site Characterization Work Plan—Phase II July 2009