Section 3
Implementation Plan for Walnut Point Lake
FINAL REPORT 3-17
USEPA (1993) reports initial costs ranging from $340,000 to $830,000 plus annual
operating costs of $60,000. System life is assumed to be 20 years.
Alum treatments are effective on average for approximately 8 years per application
and can reduce internal loading by 80 percent. Treatment cost ranges from $290/acre
to $720/acre (WIDNR 2003). The surface area of Walnut Point Lake is 41.6 acre, so
total application costs for the lake would likely range from $12,100 to $29,950.
Dredging is typically the most expensive management practice averaging $8,000/acre.
Although cost is high, the practice is 80 to 90 percent effective at nutrient removal and
will last for at least 50 years (Cortell 2002; Geney 2002).
3.2.2.9 Planning Level Cost Estimates for Implementation Measures
Cost estimates for different implementation measures are presented in Table 3-5. Cost
estimates shown in Table 3-5 are the total estimated cost per acre and many costs could
be reduced through cost share opportunities discussed in Section 3.2.1. The column
labeled Program or Sponsor lists the financial assistance program or sponsor available
for various BMPs. The programs and sponsors represented in the table are the Soil
Stabilization and Restoration Practice (SSRP), Wetlands Reserve Program (WRP), the
Conservation Reserve Program (CRP), National Resource Conservation Service
(NRCS), Conservation Cost-Share Program (CPP), Illinois EPA, and Illinois
Department of Agriculture (IDA). It should be noted that Illinois EPA 319 Grants are
applicable to all of these practices.
Table 3-5 Cost Estimate of Various BMP Measures
Source Program Sponsor BMP
Installation
Mean $/acre
CRP/CPP NRCS and IDA Seeded filter strip $25
CRP/CPP NRCS and IDA Sodded filter strip $43
CRP/CPP NRCS and IDA Riparian Buffer $60
WRP NRCS Wetland varies
NRCS Nutrient Management Plan $6-18
IDA and Illinois EPA Nutrient Management Plan $13
Nonpoint
CRP/CPP/ICCI NRCS, IDA, CCX Conservation Tillage varies
Dredging $8,000
Aerator varies
Internal
Cycling
Alum $290-$720
Total watershed costs will depend on the combination of BMPs selected to target non-point
sources within the watershed. Regular monitoring will support adaptive
management of implementation activities to most efficiently reach the TMDL goals.
3.3 Monitoring Plan
The purpose of the monitoring plan for Walnut Point Lake is to assess the overall
implementation of management actions outlined in this section. This can be
accomplished by conducting the following monitoring programs:
Track implementation of management measures in the watershed
