1. GAR050000 General Storm Water Permit for Industrial Activity
Status of the
Construction Aggregates Industry

2. General Permit No.GAR050000 Authorization to Discharge Under the
National Pollutant Discharge Elimination System
Storm Water Discharges Associated with Industrial Activity
Replaces General Permit No. GAR000000
Approximately 100 quarries/mines, 220 concrete plants, and 60 asphalt plants have applied for coverage

3. General Permit No.GAR050000 So what has changed?
The Permit’s format has been revised to be organized similar to EPA’s 2008 Multi-Sector General Permit (MSGP). 
There are new sector specific requirements, benchmarks, and best management practices (BMPs)
Smoke/Dye Testing are required at least once during the permit period.  All drains including floor drains and sinks in industrial areas must be tested and documented in the Annual Report.

4. General Permit No.GAR050000 So what has changed?
There are new SWPPP requirements and a corresponding checklist that must be submitted with the Annual Report.
There are new requirements for the SWPPP site map.
SWPPPs are required to specifically address vehicle and equipment washing as any discharge associated with these operations are not authorized and may require a separate permit.

5. General Permit No.GAR050000 So what has changed?
All employees working within areas where industrial materials or activities are exposed to storm water must be trained. EPD’s recommendation is training at time of hire and retrained at least annually.
Rosters and training dates are required to be maintained within the SWPPP or be readily available onsite. 

6. General Permit No.GAR050000 In effect since June 1, 2012
Monitoring requirements started during the first full quarter following the effective date
July 1 until September 30
The next quarter ran from October 1 until December 31, 2012
Two quarters have passed, and we’re in the third. . . where are we as an industry?

7. General Permit No.GAR050000
Statistics of GCAA Member Sites (Crushed Stone):
No. of Sites Covered Under IGP – 58
No. of SW Outfalls – 146
Average of about 2.5 per site
No. of SW Outfalls with No Discharge – 84
About 58% have not discharged
No. of Benchmark Samples Collected – 107
No. of Samples Over Benchmark – 21
About 20%
No. of Dye/Smoke Tests Completed - 0

8. Review of Monitoring Requirements
General Permit No.GAR050000
Review of Monitoring Requirements

9. General Permit No.GAR050000 Quarterly Visual Assessments Benchmark
Same as under previous permit
Benchmark
Annual
Discharges from material storage piles
Impaired Streams

10. General Permit No.GAR050000 Measurable storm event: Sample Type
Greater than 0.1” of rain that results in an actual discharge from the facility
Follows the preceding measurable storm event by at least 72 hours
Sample Type
Samples are to be collected within first 30 minutes of discharge (or as soon as practical with documentation maintained in SWPPP of why it was not possible to collect during initial 30 minutes.)
During normal operating hours

11. General Permit No.GAR050000 Quarterly Visual Assessment
Once per quarter for entire term of permit
Visually inspect for: color, odor, turbidity, floating solids, settled solids, suspended solids, foam, oil sheen, and other indicators of storm water pollution.
Document results, perform and document corrective actions as indicated by results according to the schedule in the IGP.

12. General Permit No.GAR050000 Benchmark Monitoring
Requires laboratory analysis of the sample.
Benchmarks serve as “levels of concern” for storm water sampling.
Benchmarks are not permit limits, therefore an exceedance is not a permit violation.
Primarily for permittee’s use to determine the overall effectiveness of the control measures and to determine if corrective actions are needed.

13. General Permit No.GAR050000
However, when a benchmark is exceeded, the permittee must:
Review the control measures, make necessary modifications, and document according to schedule in IGP.
Continue to sample each quarter until the benchmark is met or it is determined that no further pollutant reduction
is feasible . . .
Notify EPD of your determination in the annual report

14. General Permit No.GAR050000 Impaired Streams Monitoring
Definition: A stream with chronic or recurring monitored violations of the applicable numeric and/or narrative water quality criteria.
Applicable to discharge into or within one linear mile upstream of, and in the same watershed as, any portion of an impaired stream segment
Twice per quarter for first year of permit.
If 75% or the average pass the benchmark value, then annual monitoring.
If not, select and implement additional BMPs (up to one year)
Re evaluate by twice per quarter sampling for additional year

15. General Permit No.GAR050000 Benchmark Monitoring
Case study #1: Details
Storm water outfall from overburden area, roadway, and stockpile area
Overburden area mostly stabilized with vegetation
Sediment pond mostly reclaimed
Pipe under road carries runoff from small depression beside road and stockpile area into sediment pond
191 mg/L TSS

16. Case Study #1
stockpiles
road
overburden
sediment pond
SW outfall
pipe
creek

17. General Permit No.GAR050000 Benchmark Monitoring
Case study #1: Corrective Actions
Pipe under road was fitted with elbow to turn depression into a basin
Discharge pipe was wrapped with filter cloth and surrounded with W57s to filter sediment before discharge

18. Case Study #1
stockpiles
road
overburden
sediment pond
SW outfall
Elbow on pipe
creek

19. Case Study #1

20. Case Study #1

21. General Permit No.GAR050000 Benchmark Monitoring Case study #1:
7 mg/L TSS after corrective actions

22. General Permit No.GAR050000 Benchmark Monitoring
Case study #2: Details
Storm water from roadway to on-site customers
Catch basins / filter berms along ditch line
Runoff entered ditch at lowest point – just before discharge through pipe
438 mg/L TSS

23. Case Study #2
creek
road
catch basins / filter berms
customer sites
creek

24. General Permit No.GAR050000 Benchmark Monitoring
Case study #2: Corrective Actions
Catch basins / filter berms were cleaned out
Runoff was diverted into ditch in selected locations
Fresh filter stone was placed around pipe
Riprap plunge pool / sediment basin was installed at end of pipe – sample collected before creek

25. Case Study #2

26. Case Study #2

27. Case Study #2

28. General Permit No.GAR050000 Benchmark Monitoring Case study #2:
24 mg/L TSS after corrective actions

29. General Permit No.GAR050000 Benchmark Monitoring
Case study #3: Details
Storm water from overburden and stockpile area adjacent to on-site customer
Slopes were vegetated until new materials was stocked
Discharge pipe installed with large holes in it
592 mg/L TSS

30. Case Study #3
storm water pond
creek
road
overburden and stockpile storage
catch basins / filter berms
customer site
creek

31. General Permit No.GAR050000 Benchmark Monitoring
Case study #3: Corrective Actions
Filter berms were installed in pond on either side of discharge pipe
Fresh filter stone was placed around pipe

32. Case Study #3
filter berms
storm water pond

33. General Permit No.GAR050000 Benchmark Monitoring Case study #3:
9 mg/L TSS after corrective actions

34. General Permit No.GAR050000 Benchmark Monitoring
Case study #4: Details
Storm water from roadway and stockpile area next to a scale house
Adjacent to a creek buffer
418 mg/L TSS

35. Case Study #4
roadway
creek
road
scale house
catch basins / filter berms
creek
creek
stockpiles

36. General Permit No.GAR050000 Benchmark Monitoring
Case study #4: Corrective Actions
Installed filter berm around discharge

37. Case Study #4
filter berms
storm water pond

38. General Permit No.GAR050000 Benchmark Monitoring Case study #4:
No discharge from outfall since corrective actions were taken.

39. General Permit No.GAR050000 “No Discharge”
1) No rainfall events that met definition of “measurable”
2) At least 72 hours since last measurable rain event
3) During normal working hours
4) That results in an actual discharge from the site.

40. General Permit No.GAR050000 Monitoring Exemptions
“Substantially identical outfall” (if not discharging to imparted stream) may monitor just one outfall and report that results apply to the others as long as:
Identified in storm water pollution prevention plan (SWPPP) with rationale for determination
Similar industrial activities and control measures, exposed materials, and runoff coefficients of drainage basins.
Inactive and Unstaffed Sites
Maintain a statement onsite with SWPPP stating the site is inactive and unstaffed
Begin benchmark monitoring as in first year if facility becomes active and/or staffed

41. General Permit No.GAR050000 Monitoring Documentation Recordkeeping
For each monitoring event:
Date and duration of the rainfall event
Rainfall total (in inches)
Time (in days) since previous measurable storm event or the absence of measurable precipitation in the 72 hours preceding the monitoring event
Estimated volume (in gallons) of the discharge sampled
Recordkeeping
SWPPP, monitoring results, corrective actions, reports and other support info must be maintained for at least 3 years after expiration of permit.

42. General Permit No.GAR050000
Questions?