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«SONOMA COUNTY AGRICULTURAL COMMISSIONER’S OFFICE TABLE OF CONTENTS INTRODUCTION REGULATORY REQUIREMENTS CALIFORNIA TIGER SALAMANDER MAP CHAPTER ONE ...»

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Ridgetops 6.5. For all projects proposing tree removal, adhere to 50 foot setbacks for defined ridgetops.

Setbacks for ridgetops may consist of a 25 foot grassy turnaround and 25 foot “no touch” zone, or 50 foot “no touch” zone.

Operations 6.6. Individual trees and stands of trees to be retained within the limits of clearing shall be marked at a height visible to equipment operators and steps taken to protect the drip line of retained trees.

28

6.7. Identify and maintain the existing riparian zone. A healthy riparian zone consists of trees, shrubs of different ages growing closest to the channel and a grassy zone closest to the vineyard/orchard operation.

6.8. All native trees and associated woody vegetation should be retained within the active channel of all stream corridors.

6.9. Establish and maintain cover crops both between rows and around the perimeter of a vineyard/orchard to minimize the exposure of bare soil.

6.10. Minimize impact from roads, culvert installation and activity centers on stream channels.

6.11. Preserve existing ground cover and natural mulch around native trees to be retained in order to prevent erosion, protect roots and hold water.

6.12. Leave downed trees in the riparian corridor for recruitment as large woody debris, as long as it does not pose an immediate threat to infrastructure or property downstream.

6.13. Avoid placing other debris from tree removal operations in locations where it could potentially be discharged into streams.

6.14. All tree removal activity will be carried out from April 1st to October 15th.

6.15. At all times, erosion control measures must be utilized and in place prior to the end of the day if the US Weather Service forecast is a “chance” (30 percent or more) of rain before the next day, and prior to a weekend or other shutdown periods.

Monitoring and Reporting 6.16. During the first year after site development is completed, the project owner shall inspect the site for significant erosion or instability prior to the storm season and then monthly from October to May.

6.17. Annual monitoring reports shall be prepared and submitted to the Agricultural Commissioner on June 30th of each monitoring year. Year one will be considered the first full calendar year after final inspection.

6.18. The first year’s report shall summarize the baseline information as well as the first year’s monitoring results. Thereafter, annual reports shall include a summary of the year’s monitoring results and a discussion of trends noted or problems observed, as well as a description of any repairs that were made. The report should include a description of the monitoring methods, including data collection and analysis.

6.19. Identical color photographic scenes shall be taken and submitted to the Agricultural Commissioner before development and each January from specific locations as identified in the project permit for a minimum of three years following completion of the project.

6.20. County staff shall perform at least one on site inspection at the end of the three year monitoring period, and other inspections as necessary.

Compliance

6.21. The Agricultural Commissioner shall have all submitted engineered plans reviewed by a civil engineer, and all geologic reports reviewed by an engineering geologist. The purpose of the review shall be to verify compliance with Chapter 11 of the Sonoma County Code and these BMPs.

6.22. Projects that already have an approved CEQA document that contains measures that reduce geologic hazards and water quality impacts to a level of insignificance shall be considered to be in compliance with the applicable requirements of Chapter 11 and these BMPs.

29 APPENDIX

1) POTENTIALLY COHESIONLESS SOILS MAP

30

2) POTENTIALLY COHESIONLESS SOILS MAP UNITS

USCS Classification: GC, GC-GM, SP, SP-SW, GP-GC, GP-GM, GW-GC, GW-GM, GW, GP, SW, GM 31

3) SOIL LOSS RATIO (PERMANENT AND TEMPORARY BMPS)

The ratio between pre-and post-development predicted soil loss is called the soil loss ratio. Projects not using a sediment delivery analysis require a soil loss ratio of 1 or less. Pre-and post-development soil loss shall be calculated using the Universal Soil Loss Equation (USLE) for projects with slopes up to 25 percent and the computer based Revised Universal Soil Loss Equation (RUSLE2), or another published or peer reviewed soil loss model shall be used for projects with slopes greater than 25 up to 50 percent. The latest version of RUSLE2 can be downloaded for free at http://www.ars.usda.gov/Research/docs.htm?docid=6038 Alternatively, the applicant may use another published or peer reviewed soil loss predictive model to show no net increase in erosion from pre-development conditions or may prepare a sediment delivery analysis using a published or peer-reviewed method consistent with the standard of care that demonstrates that the project will result in no net increase in sediment delivery to streams, lakes or wetlands.

Soil Loss Equations The USLE and RUSLE2 soil loss equations are based on the

following formula: A = R x K x LS x C X P Where A = computed soil loss per acre for a given storm period of time interval;

R = rainfall factors K = soil erodibility value L = slope length factor S = steepness factor C = vegetation factor P = erosion control practice factor For the purposes of calculating the soil loss ratio, the factors of R and K are removed from the equation given the assumption that rainfall and soil type will be unchanged by site development.

Site Evaluation Divide the development area into blocks with similar landforms and slopes, generally no more than 20 acres in size for purposes of calculating the soil loss ratio or performing a sediment delivery analysis. For example, use existing drainages, major slope breaks, and topographic divides as natural boundaries between blocks. Then calculate a soil loss factor for pre-development conditions and post-development (temporary and permanent BMPs) for each block using the topographic (LS), vegetation (C) factors, and erosion control practice (P) factors as described below or using the RUSLE2 computer model.

–  –  –

6.0% 0.34 0.47 0.58 0.67 0.75 0.82 0.95 1.06 7.0% 0.41 0.58 0.71 0.82 0.92 1.01 1.16 1.30 8.0% 0.49 0.70 0.86 0.99 1.11 1.21 1.40 1.56 9.0% 0.59 0.83 1.01 1.17 1.31 1.43 1.66 1.85 10.0% 0.68 0.96 1.17 1.35 1.51 1.66 1.92 2.14 12.0% 0.87 1.23 1.51 1.74 1.95 2.13 2.46 2.75 14.0% 1.08 1.52 1.86 2.15 2.4 2.63 3.04 3.40 16.0% 1.29 1.82 2.23 2.58 2.88 3.16 3.65 4.08 18.0% 1.51 2.14 2.62 3.02 3.38 3.70 4.27 4.78 20.0% *1.74 2.46 3.01 3.48 3.89 4.26 4.92 5.50 22.0% 1.97 2.79 3.42 3.94 4.41 4.83 5.58 6.24 24.0% 2.21 3.12 3.83 4.42 4.94 5.41 6.25 6.99 26.0% 2.45 3.46 4.24 4.90 5.48 6.00 6.93 7.74 28.0% 2.69 3.81 4.66 5.38 6.02 6.59 7.61 8.51 30.0% 2.93 4.15 5.08 5.87 6.56 7.19 8.30 9.28 32.0% 3.18 4.49 5.50 6.35 7.10 7.78 8.99 10.0 34.0% 3.42 4.48 5.92 6.84 7.65 8.38 9.67 10.8 36.0% 3.66 5.18 6.34 7.32 8.18 8.97 10.4 11.6 38.0% 3.90 5.52 6.75 7.80 8.72 9.55 11.0 12.3 40.0% 4.14 5.85 7.16 8.27 9.25 10.1 11.7 13.1 45.0% 4.71 6.67 8.17 9.43 10.5 11.5 13.3 14.9 5.27 7.45 9.12 10.5 11.8 12.9 14.9 16.7 50.0% 33

4) Length of Slope (LS) Values (2 of 2)

–  –  –

6.0% 1.16 1.26 1.34 1.42 1.50 1.57 1.65 1.78 1.90 2.12 2.33 7.0% 1.43 1.54 1.65 1.75 1.84 1.93 2.02 2.18 2.33 2.60 2.85 8.0% 1.71 1.85 1.98 2.10 2.21 2.62 2.42 2.62 2.80 3.13 3.43 9.0% 2.03 2.19 2.34 2.48 2.62 2.75 2.87 3.10 3.31 3.70 4.06 10.0% 2.35 2.53 2.71 2.87 3.03 3.18 3.32 3.58 3.83 4.28 4.39 12.0% 3.02 3.26 3.48 3.69 3.89 4.08 4.27 4.61 4.93 5.51 6.03 14.0% 3.73 4.02 4.30 4.56 4.81 5.04 5.27 5.69 6.08 6.80 7.45 16.0% 4.47 4.82 5.16 5.47 5.77 6.05 6.32 6.82 7.29 8.15 8.93 18.0% 5.23 5.65 6.04 6.41 6.76 7.09 7.40 7.99 8.55 9.56 10.5 20.0% 6.02 6.51 6.96 7.38 7.78 8.16 8.52 9.20 9.84 11.0 12.0 22.0% 6.83 7.38 7.89 8.37 8.82 9.25 9.66 10.4 11.2 12.5 13.7 24.0% 7.65 8.26 8.84 9.37 9.88 10.4 10.8 11.7 12.5 14.0 15.3 26.0% 8.48 9.16 9.80 10.4 11.0 11.5 12.0 13.0 13.9 15.5 17.0 28.0% 9.32 10.1 10.8 11.4 12.0 12.6 13.2 14.2 15.2 17.0 18.6 30.0% 10.2 11.0 11.7 12.4 13.1 13.8 14.4 15.5 16.6 18.6 20.3 32.0% 11.0 11.9 12.7 13.5 14.2 14.9 15.6 16.8 18.0 20.1 22.0 34.0% 11.8 12.8 13.7 14.5 15.3 16.0 16.8 18.1 19.3 21.6 23.7 36.0% 12.7 13.7 14.6 15.5 16.4 17.2 179.0 19.4 20.7 23.2 25.4 38.0% 13.5 14.6 15.6 16.5 17.4 18.3 19.1 20.6 22.1 24.7 27.0 40.0% 14.3 15.5 16.5 17.5 18.5 19.4 20.3 21.9 23.4 26.2 28.7 45.0% 16.3 17.6 18.9 20.0 21.1 22.1 23.1 24.9 26.7 29.8 32.7 18.2 19.7 21.1 22.3 23.6 24.7 25.8 27.9 29.8 33.3 36.5 50.0% 34

5) Vegetation Factor

–  –  –

0 20 40 60 80 95 0.85 0.39 0.20 0.088 0.028 0.007

–  –  –

0 20 40 60 80 95 0.68 0.31 0.16 0.070 0.022 0.006 35

–  –  –

Maximum slope length for which the specified mulch rate is considered effective. When this limit is exceeded, either a higher 1 application rate or mechanical shortening of the effective slope length is required.

When the straw or hay mulch is not anchored to the soil, C values on moderate or steep slopes of soils having K values 2 greater than 0.30 should be taken at double the values given in this table.

36

Sonoma County Agricultural Commissioner’s Office 133 Aviation Blvd., Ste. 110 Santa Rosa, CA 95403 Phone: (707) 565-2371 Fax: (707) 565-3850

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