Includes Plate 1: Sample Numbers (map 89-5a). Plate 2: Nitrate-N in mg/L (map 89-5b). Plate 3: Chloride in mg/L (map 89-5c). Plate 4: Laboratory Measurement of pH (map 89-5d). Plate 5: Total Hardness in mg/L (map 89-5e). Plate 6: Laboratory Measurement of Electrical Conductivity in μmhos/cm (map 89-5f). Plate 7: Ferrous Iron in mg/L (map 89-5g). (Large-format photocopy.)