Division of Water Quality (701)

Transcription

1 Division of Water Quality (701) March April

2 Construction Permit Permit #: NDR Reissued April 1, 2015 Expires March 31,

3 Discharges Covered Stormwater Discharges from: Construction Activity Sites that are 1 acre or more Sites that are part of a larger common plan of development Even if the site is less than 1 acre Support Activities Concrete or asphalt batch plants Equipment staging yards Material storage areas Excavated material disposal areas Borrow areas Certain types of dewatering 3

4 Discharges such as water line disinfection, and treatment of gasoline or diesel contaminated groundwater Wash water using detergents 4

5 The permit does not preempt or supersede the authority of local agencies to prohibit, restrict, or control stormwater discharges to storm sewer systems or other water courses within their jurisdiction 5

6 Obtaining Coverage Submit notice of intent (NOI) Starting late spring of 2018, NOI can be sent to the department electronically Boxes with red outline are required fields an error message appears when ing NOI if required fields are not filled in The owner signs (wet signature required), dates and submits the NOI by mail to department to complete the application Permit coverage becomes effective 7 days after a completed (signed) application is received by the department 6

7 Obtaining Coverage Must submit Notice of Intent (NOI) Coverage is effective 7 days after a completed application is received by the department 7

8 Application Process The owner, or owner jointly with the operator, shall submit a completed application Name of owner and/or operator Contact information Project name Project location latitude and longitude required Brief description Start and end date Size of site and area disturbance 8

9 Application Process Residential construction Either the homebuilder or owner of the lot(s) submits one application for activity within a development/subdivision 9

10 Stormwater Pollution Prevention Plan Develop and implement throughout the life of the project Identify potential sources of sediment or other pollution from construction activity Ensure practices are used to reduce pollution from construction site runoff 12

11 Stormwater Pollution Prevention Plan You can use the SWPPP template provided by the department web link provided below: a company SWPPP format is also permissible provided The SWPPP meets the requirements of the permit SWPPP is considered a living document Needs to be updated as appropriate throughout the life of the project 13

12 SWPPP Site Description Description of overall activity Timetable, schedule, or chart of activities Phase of construction, erosion and sediment control installation and removal Type of soil Surface waters or storm sewer system 14

13 SWPPP Site Description Must include a site map Boundaries (include roads, streets, or water bodies adjacent to the project site) Drainage patterns Discharge points Location of sediment and erosion controls Potential pollution sources (portable toilets, bulk storage) Soil stockpiles 15

14 SWPPP Site Description Must include a site map Steep slopes Surface waters Dewatering points Fueling locations, maintenance areas, washout areas, chemical storage, debris collection 16

15 SWPPP Narrative Include a description about why erosion and sediment controls were selected 17

16 SWPPP Operational Controls Identify a person knowledgeable and experienced in the application of best management practices (BMPs) The owner shall develop a chain of responsibility to ensure the SWPPP is implemented Maintain a clean and orderly site Reduce track-out 18

17 SWPPP Operational Controls Minimize dust Preventative maintenance practices Inspection procedures Spill prevention and response procedures Storage of hazardous substances 19

18 SWPPP Operational Controls Employee training Purpose, requirements, and implementation of SWPPP Location of BMPs Installation, function, maintenance, and removal of BMPs 20

19 SWPPP Operational Controls Employee training Inspectors must understand when and what to inspect, when to initiate corrective actions, how to record findings and corrective actions Maintenance personnel must understand when maintenance is needed, and what needs to be recorded 21

20 SWPPP Operational Controls Concrete grindings and slurry management Wastewater management Concrete washout Washout from stucco, paint, joint compound Leak-proof containers or pits 22

21 SWPPP Operational Controls Describe dewatering activities Limited to uncontaminated stormwater, surface water, and ground water Operate to minimize the release of sediment Minimize erosion at the outfall May not lead to the deposition of sediment in curb and gutter, storm sewer system, or surface waters Must not cause or potentially cause a visible plume in a surface water 23

22 SWPPP Operational Controls Describe dewatering activities Draw water from the surface water, not the bottom Daily inspection 24

23 Operational Controls Litter, debris, and waste must be handled appropriately to reduce the potential for pollution Store liquid or soluble materials to prevent spills or leaks (e.g., oil, fuel, paint, and hazardous substances) Restrict access to prevent vandalism Store in accordance with applicable regulations 25

24 Operational Controls Wash water containments required and must be cleaned out at 80% storage capacity BMPs used in surface water must be cleaned immediately upon removal to prevent the transfer of aquatic nuisance species 26

25 SWPPP Erosion & Sediment Controls Consider expected amount, frequency, intensity, and duration of precipitation events Stormwater run-on and runoff Pervious to impervious surfaces Slopes Seasonal changes Drainage features 27

26 SWPPP Erosion & Sediment Controls Channelized flow must be handled to minimize erosion Consider soil type,erodibility, and settling time Seasonal conditions 28

27 Erosion & Sediment Controls Use sediment basins or equivalent sediment controls on down slope sides 29

28 Erosion & Sediment Controls Provide temporary erosion protection or permanent cover where activities have been completed or temporarily ceased 30

29 Erosion & Sediment Controls Controls need to be appropriately selected, installed, and maintained in accordance to manufacture s specs 31

30 Erosion & Sediment Controls If sediment leaves your site, off-site accumulations must be cleaned up Controls need to withstand and function properly during events of up to the 2-year, 24-hour storm event 32

31 Erosion & Sediment Controls Erosion, sediment, and stabilization practices must be provided Silt fence, fiber rolls, vegetative buffer strips, erosion control blankets, mulch, hydro-seeding, etc. Exposed areas must be stabilized immediately when construction has permanently or temporarily ceased and will not resume for 14 calendar days Must be completed within 14 days Does not include stockpiles of clean aggregate, concrete demolition, or sand 36

32 Erosion & Sediment Controls Stockpiles must have sediment controls and cannot be placed in the curb and gutter, stormwater conduits, nor ditches Stabilization is required if the site was not stabilized before winter Frozen ground and snow cover is not considered stabilized 37

33 Erosion & Sediment Controls Outlets must have energy dissipation within 24 hours of connection to a surface water Provide splash pads and downspouts for roof drains Protect storm drain inlets in the vicinity of the site Includes storm drain inlets that may be affected by tracked sediment Inlet protection is a last line of defense 39

34 Erosion & Sediment Controls Vegetative buffers Minimum width of 1 foot for every 5 feet of disturbance draining to the buffer Slope of 5% or less Area draining to the vegetative buffer must have a slope less than 6% Minimize concentrated flows Dense grassy vegetation (3 to 12 inches tall) Uniform coverage (90%) 40

35 Erosion & Sediment Controls Vegetative buffers No more than 10% may be wooded Consist of dense grassy vegetation (3 to 12 inches tall) Provide a 50 foot buffer when the project is within 50 feet of a surface water Use equivalent controls if a 50 foot buffer cannot be attained Use 100 foot buffer if the surface water is impaired for sediment, suspended solids, or turbidity 41

36 Self Inspections Once every 14 calendar days; and Within 24 hours of any storm event greater than 0.25 inches of rain per 24-hour period Rainfall amounts must be taken from a rain gauge representative of the site 44

37 Self Inspections Records of each inspection and maintenance: Date and time Person conducting the inspection Findings including recommendations and schedule for corrective actions Date and amount of rainfall events greater than 0.25 inches within 24 hours Documentation when the SWPPP has been amended Signature 45

38 Reduced Self Inspections When earthwork has been suspended due to frozen ground conditions Resume as soon as runoff occurs or the ground begins to thaw Document when an inspection cannot be done because of flooding, high winds, electrical storms, etc. 46

39 Reduced Self Inspections Inspect stabilized areas that do not meet final stabilization once per month Suspend inspections in areas that meet final stabilization 47

40 Maintenance Inspect all BMPs to ensure integrity and effectiveness SWPPP must indicate maintenance or clean out interval Must be accomplished in accordance with the permit 48

41 Maintenance Nonfunctional BMPs must be repaired or replaced with functional BMPs Corrective actions must be made before the next rain event or within 24 hours or as soon as conditions allow 49

42 Maintenance Remove sediment from devices such as silt fence when sediment approaches ½ of the above ground capacity Replace fiber rolls when ½ the original above ground height of the roll is lost due to flattening or damage Drain sediment basins and remove sediment within 72 hours when the depth of sediment reaches 1/2 the storage volume 50

43 Maintenance Maintain inlet protection devices when sediment accumulates, the filter becomes clogged, or performance is compromised 51

44 Maintenance Tracking must be minimized with BMPs (rock check, designated egress, off-site parking, etc ) Permittees are responsible for street cleaning Tracked and deposited sediment must be removed by the end of the work day or shorter time period specified by local authorities or the department 53

45 Maintenance Offsite accumulations must be removed to minimize impacts Fugitive sediment in streets could be washed into storm sewers by the next rain event or pose a safety hazard to users of public streets (MS4 violation) Inspect vegetative buffers for proper distribution of flows, sediment accumulation, and signs of rills New control measures must be used if a buffer becomes silt covered or is rendered ineffective Eroded areas shall be repaired and stabilized within 24 hours 54

46 Maintenance Records of maintenance shall include: BMPs corrected Date and time Person conducting maintenance Corrective actions taken Record of maintenance Signature 55

47 Records Location The following must be kept at the construction site: A copy of the completed and signed NOI The coverage letter from the NDDoH SWPPP Site inspection Records The construction general permit, NDR

48 Records Location Keep in a field office, trailer, shed, or vehicle that is on-site during normal working hours If the site is inactive, then documents may be stored at a local office 57

49 Records Location If electronic copies are kept, permittees must be able to access them on-site Permittees should avoid using personal electronic devices for storing electronic records 58

50 Final Stabilization All soil disturbing activities have been completed 70% pre-existing vegetative cover over the entire pervious surface area or other equivalent means necessary to prevent soil failure All temporary synthetic, and structural ESC devices (such as silt fences) have been removed 59

51 Final Stabilization Residential construction Temporary erosion protection and down gradient perimeter controls have been installed Residency has been established by the homeowner A homeowner fact sheet must be distributed to the homeowner Demonstrate that the homeowner received the fact sheet. 61

52 Transfer of Control Owner or Operator submit written request for transfers and modification within 14 days of assuming control Developer to Builder developer adjusts SWPPP and Builder fills out new NOI Builder to Homeowner a transfer is not required 62

53 Termination of Coverage Compliance with the permit is required until a notice of termination (NOT) is submitted and accepted by the NDDoH A NOT may be submitted when one of the following has been met: Final stabilization has been achieved on all portions of the site for which you are responsible Another operator/permittee has assumed control over all areas of the site that have not achieved final stabilization For residential construction only, a NOT may be filed when all the lots have been sold and/or final stabilization has been achieved 63

54 Notice of Termination (NOT) 64

55 Questions? 65

56 DEQ - Stormwater Contacts Dallas Grossman Environmental Engineer Bill Giuliani - Environmental Engineer Sam Swanberg Environmental Scientist Duane Sandvick - Environmental Scientist Department stormwater@nd.gov 66