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i ~ • 5.2.4 Ralston Creek Sampling Monthly grab samples will be taken at two sites, upstream and downstream of the waste pile , as long as there is water flowing in the o~eek, waters will be analyzed for Ra-226 and U. (See Figure 1.1-2.) 5.2.5 Ambient Air Sampling As stated in Section 2, two high volume air samplers have been installed. Two passive radon monitors will be colocated with the high volumes a:> soon as they are received. One additional radon monitor will be installed in the area of 56th and Pine Ridge Road. (See Figures 1.1-1 and 1.1-2.) 5.2.6 Radium and/or Uranium Uptake by Plants This one-time study is set up at the site adjacent to the wa~;te pile, and should give an indication of uptake of Ra-226 and/or Uranium as z~ result of • runoff from the waste pile. It consists of 3 or 4 parallel lines from the waste pile to the creek following a direct line with the runoff. Samples Neill be taken along each line at 2 to 3 foot intervals. Samples will be analyzed for Ra-226 and Uranium. 5.2.7 Infiltration/Runoff Study The final study proposed will take place when there is no flow in Ralston Creek. After a tunderstorm, water samples will be taken at the four vegetation sampling sites described above, as long as there is flow in the creek. These samples will be analyzed for Ra-226 and U. The data from this test should supple- ment the data given in Table 2.2-1. Meterological conditions will bra recorded including rainfall and temperature as well as antecedent soil moisture conditions. The data obtained from this waste dump runoff study will be combined with the data presented in Table 2.2-1 for the purposes of discussing rainfall infil- • tration into the waste dump following reclamation. The mitigating ei`fects of the waste dump soil cover, dilution of waste dump runoff by stream flow, and other factors will also be discussed. F-2