CONSTRUCTION GENERAL PERMIT RISK ASSESSMENT R-FACTOR CALCULATION NOTIFICATION

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1 CONSTRUCTION GENERAL PERMIT RISK ASSESSMENT R-FACTOR CALCULATION NOTIFICATION NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES) GENERAL PERMIT FOR STORM WATER DISCHARGES ASSOCIATED WITH CONSTRUCTION AND LAND DISTURBANCE ACTIVITIES State Water Resources Control Board Order No DWQ, as amended by DWQ (CGP) requires that dischargers assessing Risk must calculate the Rainfall Erosivity Factor (R-Factor) in the Revised Universal Soil Loss Equation through the Environmental Protection Agency (EPA) Rainfall Erosivity Factor Calculator at: The week of February 13, 2012 the Rainfall Erosivity Factor Calculator became unavailable due to maintenance. EPA has approximated that maintenance may take at least 1 month to complete. Until that time, dischargers shall calculate their project R-factor using the Construction Erosivity Waiver Fact Sheet (Fact Sheet) provided by EPA at (also attached). The Fact Sheet provides the instructions and references needed to calculate R-values for a one year period. Projects active for more than a one year period must calculate the R-factor for year 1, and multiply this value based on the estimated duration. Please contact the Storm Water Help Desk if you have any questions or Examples: 1. Find the R value of a construction project in Sacramento, California with a duration of February 29, 2012 to September 1, 2014 (2.5 years). Figure 1 - Erosivity Index Zone Map: The EI distribution zone is 23 Table 1 Erosivity Index Table: EI percentage February 29 to December 31: 100% 25.7% = 74.3% EI percentage January 1 to February 29: 25.7% - 0.0% = 25.7% Total EI percentage for 1 year duration: 74.3% % = 100% EI percentage February 29 to September 1 (0.5 year): 54.1% % = 28.4% Figure 4 Isoerodent Map of California: Interpolated annual erosion index for location: 35

2 - 2 - R-Factor for 2 year construction: 35 x (100%) x 2 years = 70 R-Factor for 0.5 year construction: 35 x (28.4%) = 9.94 R-Factor for complete project duration (2.5 years) = = Find the R value of a construction project in San Diego, California with a duration of June 30, 2012 to November 1, 2013 (1.333 years). Figure 1 - Erosivity Index Zone Map: The EI distribution zone is 25 Table 1 Erosivity Index Table: EI percentage June 30 to December 31: 100% 57.2% = 42.8% EI percentage January 1 to June 30: 57.2% - 0.0% = 57.2% Total EI percentage for 1 year duration: 42.8% % = 100% EI percentage June 30 to November 1 (0.333 year): 69.4% % = 12.2% Figure 4 Isoerodent Map of California: Interpolated annual erosion index for location: 25 R-Factor for 1 year construction: 25 x (100%) = 25 R-Factor for year construction: 25 x (12.2%) = 3.05 R-Factor for complete project duration (1.333 years) = = 28.05

3 Stormwater Phase II Final Rule Fact Sheet Series Overview 1.0 Stormwater Phase II Proposed Rule Overview Small MS4 Program 2.0 Small MS4 Stormwater Program Overview 2.1 Who s Covered? Designation and Waivers of Regulated Small MS4s 2.2 Urbanized Areas: Definition and Description Minimum Control Measures 2.3 Public Education and Outreach 2.4 Public Participation/ Involvement 2.5 Illicit Discharge Detection and Elimination 2.6 Construction Site Runoff Control 2.7 Post-Construction Runoff Control 2.8 Pollution Prevention/Good Housekeeping 2.9 Permitting and Reporting: The Process and Requirements 2.10 Federal and State- Operated MS4s: Program Implementation Construction Program 3.0 Construction Program Overview 3.1 Construction Rainfall Erosivity Waiver Industrial No Exposure 4.0 Conditional No Exposure Exclusion for Industrial Activity United States Office of Water EPA 833-F Environmental Protection (4203) Revised March 2012 Agency Fact Sheet Stormwater Phase II Final Rule Construction Rainfall Erosivity 1 Waiver The 1972 amendments to the Federal Water Pollution Control Act, later referred to as the Clean Water Act (CWA), prohibit the discharge of any pollutant to navigable waters of the United States unless the discharge is authorized by a National Pollutant Discharge Elimination System (NPDES) permit. Because construction site stormwwater runoff can contribute significantly to water quality problems, the Phase I Stormwater Rule imposed a requirement that all construction sites with a planned land disturbance of 5 acres or more obtain an NPDES permit and implement stormwater runoff control plans. Phase II extends the requirements of the stormwater program to sites of between 1 and 5 acres. The Rainfall erosivity waiver allows permitting authorities to waive those sites that do not have adverse water quality impacts. What is Erosivity? Erosivity is the term used to describe the potential for soil to wash off disturbed, devegetated earth during storms. The potential for erosion is in part determined by the soil type and geology of the site. For instance, dense, clay-like soils on a glacial plain will erode less readily when it rains than will sandy soils on the side of a hill. Another important factor is the amount and force of precipitation expected during the time the earth will be exposed. While it is impossible to predict the weather several months in advance of construction, for many areas of the country, there are definite optimal periods, such as a dry season when rain tends to fall less frequently and with less force. When feasible, this is the time to disturb the earth, so that the site can be stabilized by the time the seasonal wet weather returns. There are many other important factors to consider in determining erosivity, such as freeze/thaw cycles and snow pack. How Is Site Erosivity Determined? The Universal Soil Loss Equation (USLE) was developed by the U.S. Department of Agriculture (USDA) in the 1950s to help farmers conserve their valuable topsoil. The methodology for determining if a site qualifies for the erosivity waiver provided in this guide is based on the USDA Handbook Predicting Soil Erosion by Water: A Guide to Conservation Planning With the Revised Universal Soil Loss Equation (RUSLE), dated January (Note that a more updated version of USLE, the Revised USLE, Version 2 (RUSLE2), is available and can be used as an alternative method for determining if a site qualifies for the erosivity waiver. Information about the RUSLE2 computer program is provided later in this fact sheet.) Using a computer model supported by decades worth of soil and rainfall data, USDA established estimates of annual erosivity values (R factors) for sites throughout the country. These R factors are used as surrogate measures of the impact that rainfall had on erosion from a particular site. They have been mapped using isoerodent contours, as shown in Figures 2 through 5. USDA developed the Erosivity Index Table (EI Table, provided here in Table 1), to show how the annual erosivity factor is distributed throughout the year in two-week increments. Table 1 is based on 120 rainfall distribution zones for the continental U.S. Detailed instructions for calculating a project R factor are provided later in this fact sheet. 1 This revised fact sheet corrects errors identified in calculating the R factor from the 2001 version, and includes updated information about the USLE.

4 Fact Sheet Construction Rainfall Erosivity Waiver Page 2 The Stormwater Phase II rule allows permitting authorities to waive NPDES requirements for small construction sites if the value of the rainfall erosivity factor is less than 5 during the period of construction activity (see (b)(15)(i)(A)). Note that the permitting authority has the option to not allow waivers for small construction activity. If the R factor for the period of construction calculates to less than 5, and the permitting authority allows the use of the waiver, the site owner may apply for a waiver under the low rainfall erosivity provision of the applicable EPA or State NPDES regulations. When applying, owners are encouraged to consider other site-specific factors, such as proximity to water resources and the sensitivity of receiving waters to sedimentation impacts. The small construction operator must certify to the permitting authority that the construction activity will take place during a period when the rainfall erosivity factor is less than 5. The start and end dates used for the construction activity will be the initial date of disturbance and the anticipated date when the site will have achieved final stabilization as defined by the permit, respectively. If the construction continues beyond this period, the operator will need to recalculate the Erosivity Index for the site based on this new ending date (but keeping the old start date) and either resubmit the certification form or apply for NPDES permit coverage. What Other Factors Can Affect Waiver Availability and Eligibility? PA has established the R factor of less than 5 as the criteria Efor determining waiver eligibility. However, since the intent is to waive only those construction activities that will not adversely impact water quality, State and Tribal permitting authorities have considerable discretion in determining where, when, and how to offer it. They can establish an R factor threshold lower than 5, or they can suspend the waiver within an area where watersheds are known to be heavily impacted by, or sensitive to, sedimentation. They can also suspend the waiver during certain periods of the year. They may opt not to offer the waiver at all. NOTE: This waiver is not available to sites that will disturb more than 5 acres of land (large construction). What if My Site Is Not Eligible? f your site is not eligible for a waiver, you must submit a INotice of Intent, or whichever type of application is required, to obtain coverage under the applicable NPDES construction stormwater permit, and comply with its requirements. For information about EPA s Construction General Permit (CGP), see State program information is available at STATE. Examples 1. Construction started and completed in one calendar year. Find the R factor value of a construction site in Denver, Colorado. Assume the site will be disturbed from March 10 to May 10 of the same year. The EI distribution zone is 84 (Figure 1). Referring to Table 1, the project period will span from March 1 (from Table 1, the closest date prior to the actual March 10 start date) to May 15 (from Table 1, the closest date after the actual May 10 end date). The difference in values between these two dates is 9.7% ( = 9.7). Since the annual erosion index for this location is about 45 (interpolated from Figure 2), the R factor for the scheduled construction project is 9.7% of 45, or 4.4. Because 4.4 is less than 5, the operator of this site would be able to seek a waiver under the low rainfall erosivity provision. 2. Construction spanning two calendar years. Find the R factor value for a construction site in Pittsburgh, Pennsylvania. Assume the site will be disturbed from August 1 to April 15. The EI distribution zone is 111 (Figure 1). Referring to Table 1, the project period will span from July 29 (from Table 1, the closest date prior to the actual August 1 start date) to April 15. The difference in values between July 29 and December 31 is 35% ( = 35.0). The difference between January 1 and April 15 is 8%. The total percentage EI for this project is 43% ( = 43). Since the annual erosion index for this location is 112 (interpolated from Figure 2), the R factor for the scheduled construction is 43% of 112, or 48. Since 48 is greater than 5, the operator of this site would not be able to seek a waiver under the low rainfall erosivity provision. How Do I Compute the R factor for My Project? 1. Estimate the construction start date. This is the day you expect to begin disturbing soils, including grubbing, stockpiling, excavating, and grading activities. 2. Estimate the day you expect to achieve final stabilization, as defined by your permitting authority s regulations or NPDES construction stormwater permit, over all previous disturbed areas. This is your construction end date. 3. Refer to Figure 1 to find your Erosivity Index (EI) Zone based on your geographic location.

6 Fact Sheet Construction Rainfall Erosivity Waiver Page 4 Figure 1. Erosivity Index Zone Map

7 Fact Sheet Construction Rainfall Erosivity Waiver Page 5 Figure 2. Isoerodent Map of the Eastern U.S. Note: Units for all maps on this page are hundreds ft tonf in(ac h yr) -1

8 Fact Sheet Construction Rainfall Erosivity Waiver Page 6 Figure 3. Isoerodent Map of the Western U.S. Note: Units for all maps on this page are hundreds ft tonf in(ac h yr) -1

9 Fact Sheet Construction Rainfall Erosivity Waiver Page 7 Figure 4. Isoerodent Map of California Note: Units for all maps on this page are hundreds ft tonf in(ac h yr) -1

10 Fact Sheet Construction Rainfall Erosivity Waiver Page 8 Figure 5. Isoerodent Map of Oregon and Washington Note: Units for all maps on this page are hundreds ft tonf in(ac h yr) -1

11 Table 1. Erosivity Index (%EI Values extracted from USDA Manual 703) All values are at the end of the day listed below - Linear interpolation between dates is acceptable. EI as a percentage of Average Annual R Value Computed for Geographic Areas Shown in Figure 1 Month Jan Jan Jan Feb Mar Mar Mar Apr Apr May May Jun Jun Jul Jul Aug Aug Sept Sept Oct Oct Nov Nov Dec Dec Day EI Zone Fact Sheet Construction Rainfall Erosivity Waiver Page 9

12 Month Jan Jan Jan Feb Mar Mar Mar Apr Apr May May Jun Jun Jul Jul Aug Aug Sept Sept Oct Oct Nov Nov Dec Dec Day EI Zone Fact Sheet Construction Rainfall Erosivity Waiver Page 10

13 Month Jan Jan Jan Feb Mar Mar Mar Apr Apr May May Jun Jun Jul Jul Aug Aug Sept Sept Oct Oct Nov Nov Dec Dec Day EI Zone Fact Sheet Construction Rainfall Erosivity Waiver Page 11

14 Month Jan Jan Jan Feb Mar Mar Mar Apr Apr May May Jun Jun Jul Jul Aug Aug Sept Sept Oct Oct Nov Nov Dec Dec Day EI Zone Fact Sheet Construction Rainfall Erosivity Waiver Page 12

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