Upper Yakima Watershed Study Sites of Interest

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					         Upper Yakima Watershed Study - Sites of Interest
                                                               “A Fundamental promise we must make to our people is that the food
                                                                they eat and the water they drink are safe.” – Former President Bill
                                                                Clinton, Safe Drinking Water Act Reauthorization, August 6, 1996

                                                                     Figure 1 – Flow Chart for Project

                                                                                                                                                                            MCLG MCL
                                                                                                                                                                            (ppb) (ppb)
                                                                                                                                                         Aluminum              5         -
                                                                                                                                         Table 1 – USEPA
                                                                                                                                         MCLG, MCL for Arsenic                 0         1
    •          The Safe Drinking Water Act (SDWA), originally passed in 1974 and amended in 1986 and 1996,                               Trace Metals in Copper               130       130
               gives the United States Environmental Protection Agency (USEPA) the authority to set drinking                             Drinking Water
                                                                                                                                                         Iron                  30        -
               water standards.
                                                                                                                                                            Lead               0        1.5
    •          Drinking water standards are regulations that the USEPA sets to control the level of contaminants
                                                                                                                                                            Manganese          5         -
               in the nation’s drinking water supply.
                                                                                                                                                            Nickel             10       10
    •          This project is aimed at identifying study sites of interest in regard to these USEPA drinking water
                                                                                                                                                            Uranium            0        30
               standards for trace metals. (See Figure 1 & Table 1)
                                                                                                                                                            Zinc              500        -

                                                                                          There are two categories of drinking water standards:
                                                                                          •       National Primary Drinking Water Regulation – legally enforceable
                                                                                                  standards, contaminants that adversely affect public health and are
                                                                                                  known or are anticipated to occur in water.
                                                                                                     •        Set by Maximum Contaminant Level (MCL), the
                                                                                                              maximum permissible level of a contaminant in water
                                                                                                              which is delivered to any user of a public water system.
                                                                                          •       National Secondary Drinking Water Regulation – non-enforceable
                                                                                                  standards, contaminants that result in cosmetic or aesthetic effects.
                                                                                                     •        Set by Maximum Contaminant Level Goal (MCLG), the
                                                                                                              max level of a contaminant in drinking water at which no
                                                                                                              known or anticipated adverse effect on the health of
                                                                                                              person would occur, allowing for an adequate margin of
                                                                                          •       The MCL is set as close as possible to the MCLG, which the SDWA
                                                                                                  defines as the level that can be achieved with the use of best
                                                                                                  available technology and treatment techniques, taking cost into
  Figure 2 – Study Sites in the Upper Yakima Watershed                                            consideration.
                                                                                          •       For this study if there was no set MCL, the set MCLG was used.
                                                                                          •       The Interest Level is based on number of contaminants above the
                                                                                                  permissible limit set by USEPA. An interest level of 3 or higher is
                                                                                                  sufficient for a site to be considered for future monitoring measures.
  Figure 3 – Sites of Interest in the Upper Yakima Watershed

                                                                                                                                                      Table 2 – Study Sites Recommended
                                                                                                                                                      For Future Monitoring
                                                                                                                                                       Sample        Type   Interest Level
                                                                                                                                                       NCEGW-1       GW             6
                                                                                                                                                       NCEGW-4       GW             4
                                                                                                                                                       NCEGW-5       GW             3
                                                                                                                                                       NCEGW-9       GW             3
                                                                                                                                                       NCESW-4       SW             4
                                                                                                                                                       SCE-1         GW             3
                                                                                                                                                       SCE-2         GW             3
                                                                                                                                                       SCE-3         GW             3
                                                                                                                                                       SCE-5         GW             3
                                                                                                                                                       SCE-7         SW             3
                                                                                                                                                       SCE-8         SW             3
                                                                                                                                                       SCE-9         SW             4
                                                                                                                                                       SCE-10        GW             3
                                                                                                                                                       SCE-11        GW             3
                                                                                                                                                       TEA-1         GW             4
                                                                                                                                                       TEA-7         GW             3
                                                                                                                                                       ROS-10        GW             3

Hydrography: Pacific Northwest River Reach Files, USGS; Base map modified from USGS data, USGS; Study Sites: digitized from various hard maps; Trace Metal Data: CWU-Env. Geochemistry 2008
Projection: Lambert Conformal Conic Datum: North American Datum of 1983 HARN Standard Parallels: 45 59 98 and 47 19 60 Central Meridian: 120 30 00

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