associations is achieved. This parameter was designed to be measured for a period of 5 years after initial plant installation.

Long-Term Success Criterion

Percent cover formed the basis for establishment of long-term success criterion. This criterion calls for achievement of a steady trend toward reaching the ultimate goal of 75% cover for trees and 45% cover for shrubs. The mitigation monitoring report indicated that after the fifth year, the percent cover by trees and shrubs would be monitored as the prime indicator of increasing habitat values. This parameter was designed to be measured for a 10-year period with yearly monitoring occurring through year 5 and biennial monitoring occurring thereafter until year 10.

Duration of Monitoring

The mitigation monitoring plan called for a 15-year monitoring period in which plant survival and species composition would be measured for a total of six consecutive years starting with year 0 (H.T.Harvey and Associates 1992). Plant vigor and health, plant height, basal area, natural reproduction and species diversity were to be monitored yearly through year 5 and every other year through year 10. Root development was to be monitored in years 3, 4, and 5, while hydrological monitoring and photo documentation of the site were to be carried out yearly for 15 consecutive years, including year 0.

Site Installation and Postinstallation Site Review

Grading, installation of water control structures, and planting took place at the Coyote Creek mitigation site from May through September 1993. A total of 10,484 container plants of riparian species were installed between May and June. Results from monitoring visits in September 1993 (year 0) indicated that insects, dust, drought, and browse damage were the most common plant damage factors, although it was noted that none were significantly impeding restoration efforts (H.T.Harvey and Associates 1993). Actions implemented to respond to the September 1993 monitoring results included weed control, mulch application, installation of foliage protectors, erosion control remedial measures, installation of groundwater monitoring systems, and insect/rodent abatement.

Mitigation Monitoring and Site Development

Due to funding and contracting issues associated with the California Department of Transportation, mitigation monitoring reports for 1994,

The National Academies | 500 Fifth St. N.W. | Washington, D.C. 20001
Copyright © National Academy of Sciences. All rights reserved.
Terms of Use and Privacy Statement