Presentation on theme: "GAR General Storm Water Permit for Industrial Activity"— Presentation transcript:
1GAR050000 General Storm Water Permit for Industrial Activity Status of theConstruction Aggregates Industry
2General Permit No.GAR050000 Authorization to Discharge Under the National Pollutant Discharge Elimination SystemStorm Water Discharges Associated with Industrial ActivityReplaces General Permit No. GAR000000Approximately 100 quarries/mines, 220 concrete plants, and 60 asphalt plants have applied for coverage
3General 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.
4General 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.
5General 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.
6General Permit No.GAR050000 In effect since June 1, 2012 Monitoring requirements started during the first full quarter following the effective dateJuly 1 until September 30The next quarter ran from October 1 until December 31, 2012Two quarters have passed, and we’re in the third. . . where are we as an industry?
7General Permit No.GAR050000Statistics of GCAA Member Sites (Crushed Stone):No. of Sites Covered Under IGP – 58No. of SW Outfalls – 146Average of about 2.5 per siteNo. of SW Outfalls with No Discharge – 84About 58% have not dischargedNo. of Benchmark Samples Collected – 107No. of Samples Over Benchmark – 21About 20%No. of Dye/Smoke Tests Completed - 0
8Review of Monitoring Requirements General Permit No.GAR050000Review of Monitoring Requirements
9General Permit No.GAR050000 Quarterly Visual Assessments Benchmark Same as under previous permitBenchmarkAnnualDischarges from material storage pilesImpaired Streams
10General Permit No.GAR050000 Measurable storm event: Sample Type Greater than 0.1” of rain that results in an actual discharge from the facilityFollows the preceding measurable storm event by at least 72 hoursSample TypeSamples 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
11General Permit No.GAR050000 Quarterly Visual Assessment Once per quarter for entire term of permitVisually 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.
12General 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.
13General Permit No.GAR050000However, 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 reductionis feasible . . .Notify EPD of your determination in the annual report
14General 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 segmentTwice 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
15General Permit No.GAR050000 Benchmark Monitoring Case study #1: DetailsStorm water outfall from overburden area, roadway, and stockpile areaOverburden area mostly stabilized with vegetationSediment pond mostly reclaimedPipe under road carries runoff from small depression beside road and stockpile area into sediment pond191 mg/L TSS
16Case Study #1stockpilesroadoverburdensediment pondSW outfallpipecreek
17General Permit No.GAR050000 Benchmark Monitoring Case study #1: Corrective ActionsPipe under road was fitted with elbow to turn depression into a basinDischarge pipe was wrapped with filter cloth and surrounded with W57s to filter sediment before discharge
18Case Study #1stockpilesroadoverburdensediment pondSW outfallElbow on pipecreek
21General Permit No.GAR050000 Benchmark Monitoring Case study #1: 7 mg/L TSS after corrective actions
22General Permit No.GAR050000 Benchmark Monitoring Case study #2: DetailsStorm water from roadway to on-site customersCatch basins / filter berms along ditch lineRunoff entered ditch at lowest point – just before discharge through pipe438 mg/L TSS
23Case Study #2creekroadcatch basins / filter bermscustomer sitescreek
24General Permit No.GAR050000 Benchmark Monitoring Case study #2: Corrective ActionsCatch basins / filter berms were cleaned outRunoff was diverted into ditch in selected locationsFresh filter stone was placed around pipeRiprap plunge pool / sediment basin was installed at end of pipe – sample collected before creek
28General Permit No.GAR050000 Benchmark Monitoring Case study #2: 24 mg/L TSS after corrective actions
29General Permit No.GAR050000 Benchmark Monitoring Case study #3: DetailsStorm water from overburden and stockpile area adjacent to on-site customerSlopes were vegetated until new materials was stockedDischarge pipe installed with large holes in it592 mg/L TSS
30Case Study #3storm water pondcreekroadoverburden and stockpile storagecatch basins / filter bermscustomer sitecreek
31General Permit No.GAR050000 Benchmark Monitoring Case study #3: Corrective ActionsFilter berms were installed in pond on either side of discharge pipeFresh filter stone was placed around pipe
38General Permit No.GAR050000 Benchmark Monitoring Case study #4: No discharge from outfall since corrective actions were taken.
39General Permit No.GAR050000 “No Discharge” 1) No rainfall events that met definition of “measurable”2) At least 72 hours since last measurable rain event3) During normal working hours4) That results in an actual discharge from the site.
40General 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 determinationSimilar industrial activities and control measures, exposed materials, and runoff coefficients of drainage basins.Inactive and Unstaffed SitesMaintain a statement onsite with SWPPP stating the site is inactive and unstaffedBegin benchmark monitoring as in first year if facility becomes active and/or staffed
41General Permit No.GAR050000 Monitoring Documentation Recordkeeping For each monitoring event:Date and duration of the rainfall eventRainfall total (in inches)Time (in days) since previous measurable storm event or the absence of measurable precipitation in the 72 hours preceding the monitoring eventEstimated volume (in gallons) of the discharge sampledRecordkeepingSWPPP, monitoring results, corrective actions, reports and other support info must be maintained for at least 3 years after expiration of permit.