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July 1993 -32- 923-2515 • Ground water quality data (Table 5.23) in Scotchmans Gulch is from asame-day, down-gradient sample (WRD-1) located below the confluence with Armand Draw. The conductivity (4.07 mmhos/cm) is approaching the limit for germination of wheat and barley (Gonzales 1993). The sodium adsorption ratio (SA.R) (4.3) is acceptable. Boron is (0.34 mg/1) is within acceptable limits and chloride (43 mg/:I) is well below the suspect level of 250 mg/I. With a pH higher than 7.0 there is no adverse: impact f'or aluminum, manganese, nickel, and zinc, as discussed earlier. The values for arsenic, cadmium, copper, lead, molybdenum, and selenium aze below suspect levels. 5.4.2 Water Rights. lrrigation Ditches, and Diversion Points There aze no existing water rights on Scotchmans Gulch and no existing irrigation ditches (Table 5.17). A small ditch begins at the base of a small hill in the edge of a grain field between Scotchmans Gulch and Armand Draw and extends north for about 1.5 mile to intercept Scotchmans Gulch. This ditch is not related to flood irrigation activities. The ditch was installed by Hockett (1993), the landowner in 1972 to divert stormwater runoff from the field and prevent alkali salt from being deposited in the field. 5.4.3 Existing Flood lrrigation Areas There aze no existing flood irrigation areas along Scotchmans Gulch. 5.4.4 Subirrigated Areas Approximately 12 acres of a large grain field on the Hockett property is potentially subirrigated (Figure 2). The Spicerton fine sandy loam soils in this field have a hydric soil component, a high available water capacity, and a very low permeability. The surt'ace layer of this soil is a light brownish gray (lOYR 6/2 dry) fine sandy loam two inches thick. The subsoil is a grayish brown (lOYR 5/2 dry) clay loam six inches thick over a highly saline-alkaline light brownish Golder Associates