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

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

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.

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.

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. 

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?

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

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

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

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

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.

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.

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

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

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

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

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

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

Case Study #1

Case Study #1

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

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

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

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

Case Study #2

Case Study #2

Case Study #2

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

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

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

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

Case Study #3 filter berms storm water pond

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

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

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

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

Case Study #4 filter berms storm water pond

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

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.

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

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.

General Permit No.GAR050000 Questions?