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. o o ~ en . . With the state cost sharing, the spending limit totals $107 Million, The contracts signed and the efforts under negotiation total $98 Million, It is possible not all components of each authorized effort and not all proposed efforts yet to be contracted for will be built. Any funds not used as anticipated can be added to the $9 Million to fund not yet identified measures to be offered in future RFP's, Under potential new measures, Table 4-2 includes unidentified efforts to control 68,100 tons per year that will need to be implemented before 2015 under the Basinwide Program, Additional salt loading would be controlled in the Price San Rafael area in the joint effort with USDA through contracts with water users who have yet to be identified, It is apparent that the $9 Million remaining cannot provide for this amount of salinity control. Hence, the plan of implementation must rely on Congress authorizing an increase in the appropriation ceiling, Bureau orLand Management The Bureau of Land Management (BLM) component of the plan of implementation includes managing both point and nonpoint sources of salt contribution from public lands in the Colorado River Basin, The majority of salt derived from 'public lands is of nonpoint source origin. The greatest reductions in salt loading are therefore achieved through normal management practices which minimize soil disturbances, repair disturbed surface environments, and protect water quality, However, due to the nature of such nonpoint sources, the imprecise boundaries encompassed by many management decisions, and the large areas affected, it is difficult to quantifY actual impacts on salinity with precision, In contrast, the calculation of salt reduction and/or retention from point source control is relatively easy, The following paragraphs briefly describe BLM's activities included in the plan of implementation. Point Source Control: Well plugging represents one of the few opportunities for BLM to eliminate salt from point sources, Occasionally, old or improperly abandoned wells deteriorate and discharge flowing saline waters to the surface, Where the operator is not known or no longer exists, these wells are referred to as orphan wells. Stopping the discharge of large volumes of saline water from these old, improperly abandoned wells has reduced the contribution of salt from these point sources by approximately 9,600 tons/year, Nonvoint Source Control; Most ofthe salinity reduction achieved by BLM originates from nonpoint sources, Actions tend to fit under one of the following aspects of resource management, within which there is some unavoidable overlap; planning and administrative decisions, vegetative management, wild horse and burro management, construction and maintenance, or use authorizations, Actions taken by BLM to reduce salt contributions from nonpoint sources currently prevent approximately 28,600 tons of salt per year from reaching the Colorado River. 4-9