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. • Temporary stockpiling of copper concentrate <br /> It should, however, be noted that the site has been used for a multitude of <br /> industrial activities, including storage of coal on site and in the adjacent land <br /> parcels by other parties, prior to the commencement of and contemporaneous <br /> with MSC's lease of this land parcel. <br /> IV. Monitoring Well Locations and Redevelopment <br /> Four monitoring wells are located on Parcels I, II and III at the Delta Bulk <br /> Terminals Facility. A site reconnaissance and a magnetometer survey were <br /> performed on April 9, 2003 to locate the four monitoring wells and access the <br /> current condition of each well. As indicated in the background section, Dames <br /> and Moore installed the wells in 1991 under well installation permits issued by <br /> the San Joaquin County Environmental Health Department (EHD) (see <br /> Reference). Well logs and details were not available but all appeared to be <br /> either Sch. 40 PVC cased 2-inch diameter, or Sch 80 PVC cased 4-inch diameter <br /> 25-foot deep monitoring wells. When the monitoring wells were uncovered and <br /> repaired on April 25, 2003, all the casings were found to be 4-inch diameter well <br /> casings. The April 9, 2003 site reconnaissance with Global Positioning System <br /> (GPS) monitoring well location coordinates is summarized below. The wells <br /> were redeveloped as summarized in Table 1. <br /> The GPS locations for the wells are Monitoring Well MW-1 (GPS N 37 <br /> 56.879; W 121 19.968); Monitoring Well MW-2 (GPS N 37 56.719; W 121 <br /> 19.997); Monitoring Well MW-3 (GPS N 37 56.740; W 121 19.949); Monitoring <br /> Well MW-4 (GPS N 37 56.808; W 121 19.919) (see Figure 2). <br /> Table 1. Monitoring Well Redevelopment Summary, April 25, 2003 <br /> Monitoring Temp. F pH Conductivity Turbidity Well Depth to <br /> Well No. µmhos/cm NTU Depth feet Water <br /> feet below <br /> existing <br /> rade <br /> MW-1 start 63.6 6.5 1777 673 22.17 8.48 <br /> MW-1 finish 64.1 7.2 1673 20 22.20 13.80 risin <br /> MW-2 start 64.5 6.9 2306 >1000 19.53 3.70 <br /> MW-2 finish 64.8 6.5 2603 22 20.50 12.04 <br /> MW-3 start 63.0 4.4 1763 >1000 20.80 7.20 <br /> MW-3 finish Pump Clogged Ended Redevelopment After 15 gallons <br /> pumped <br /> MW-4 start 66.3 6.4 2656 >1000 22.74 6.79 <br /> MWA finish 67.3 6.5 2777 160 22.75 7.99 <br /> . Legend: F: degrees Fahrenheit Unit. pH: log scale. µmho/cm:micro mho per centimeter <br /> NTU:Nephelometric Turbidity Units. Severe sand pumping in Well MW-3. <br /> 5 <br />