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Home My WebLink About20090566 Ver 2_Stormwater Info_2010111009-05G(oVa CATERPILLAR@??6¢on¢o Caterpillar Core PDC Test Facility INETLRNOS?roSM M TMa Operation and Maintenance Agreement Caterpillar, Inc. will keep a maintenance record for the permanent stormwater devices approved as part of the stormwater management plan for the 401 Water Quality Certification, issued on May 21, 2009. This maintenance record will be kept in a log in a known set location. Any deficient items noted in this inspection will be corrected, repaired or replaced immediately. These deficiencies can affect the integrity of structures and safety of the public. General Owner shall adhere to the following requirements as set forth in the approved NPDES General Stormwater Permit NCGO1000 (Construction Activities). SECTION B: MINIMUM MONITORING AND REPORTING REQUIREMENTS Minimum monitoring and reporting requirements are as follows unless otherwise approved in writing by the Director of the Division of Water Quality. 1. All erosion and sedimentation control facilities shall be inspected by or under the direction of the permittee at least once every seven calendar days (at least twice every seven days for those facilities discharging to waters of the State listed on the latest EPA approved 303(d) list for construction related indicators of impairment such as turbidity or sedimentation**) and within 24 hours after any storm event of greater that 0.5 inches of rain per 24 hour period. A rain gauge shall be maintained on the site and a record of the rainfall amounts and dates shall be kept by the permittee. (I The latest approved list may be obtained from the Division of Water Quality, or from the following website location: http//h2o.enr.state.nc.us/su/construction303d) 2. Once land disturbance has begun on the site, stormwater runoff discharges shall be inspected by observation for stormwater discharge characteristics as defined below at the frequency in #1 above to evaluate the effectiveness of the pollution control facilities or practices. If any visible sedimentation is leaving the disturbed limits of the site, corrective action shall be taken immediately to control the discharge of sediments outside the disturbed limits. S:\1517\0210 - CAT Clayton Test Area\40-Permit\Phase 2A\401 Submittal\O&MAgreement.Rev102510.doc Stormwater Discharge Characteristics Monitoring Type 1 Monitoring Location 2 Clarity SDO Floating Solids SDO Suspended Solids SDO Oil Sheen SDO Other obvious indicators of stormwater pollution SDO Footnotes: 1 Monitoring Type: The monitoring requires a qualitative observation of each stormwater outfall. No analytical testing or sampling is required. 2 Sample Location: Stormwater Discharge Outfall (SDO) 3. The operator shall keep a record of inspections. Visible sedimentation found outside of the disturbed limits shall be recorded and a brief explanation kept with the records as to the measures taken to control future releases. Any measures taken to clean up the sediment that has left the disturbed limits shall also be recorded. These records shall be made available to DWQ or authorized agent upon request. If the language of the NPDES General Stormwater Permit NCGO 1000 (Construction Activities) is updated, the owner will update this language accordingly. Owner should contact the local NC Division of Water Quality Regional Office if there are questions or concerns regarding turbidity or water quality. (Martin Richmond 919- 791-4250) For the permanently disturbed areas, the owner shall provide the following measures at the completion of each testing period or every 8 weeks, whichever occurs first. 1. Backfill all open holes and grade areas back to its original grade per site plan. 2. Clean any silt from perimeter drainage ditches around field. 3. Scarify or disk the entire surface of the field in a pattern perpendicular to the natural slope. * Note that if an area has been disked and has not been used for testing, then the timeframe to disk again will commence with the start of the testing in this area. Check Dams • Check dams shall be inspected at least once every week and within 24 hours of a rainfall of 0.5 inches or more • If erosion has taken place around or below the rock check dam or if rocks have been dislodged, repairs shall be made to prevent further damage. • Sediment shall be removed once it has accumulated to one-half the height of the rock check dam. S:\1517\0210 - CAT Clayton Test Area\40-Permit\Phase 2A\401 Submittal\O&MAgreement.Rev102510.doc Preformed Scour Holes • Scour holes shall be inspected at least once every week and within 24 hours of a rainfall of 0.5 inches or more. • Remove any trash or debris that has accumulated in the scour hole. • If any rip rap has been dislodged or any noticeable damage to the filter fabric has occurred, repairs shall be made to prevent further damage. • If any erosion has occurred on the downstream side of the scour hole, repairs shall be made to prevent further damage. • Sediment shall be removed once it has accumulated to one-half the depth of the scour hole. Upstream Vegetated Filter • Vegetated filter shall be watered twice weekly if no rainfall occurs until newly planted vegetation is established. Lime and a one-time fertilizer application may be used. • Vegetated filter shall be inspected quarterly or after every storm event greater than one inch. • In noticeably eroded and bare areas, repair and reseed to establish new ground cover. • Vegetated filter shall be aerated and reseeded annually to maintain a dense growth of vegetation. Additionally, pH shall be tested annually and lime added is necessary. • Two to three times a year, vegetation shall be mowed and the clippings harvested to promote the growth of thick vegetation with optimum pollutant removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and may be allowed to grow as tall as 12 inches. • Remove any nuisance vegetation that may be choking out desirable species. Permanent Sediment Skimmer Basin • Basin should be inspected once a month and within 24 hours after every storm event greater than 1 inch. Records of operation and maintenance should be kept in a known set location and must be available upon request. • Remove trash and debris if present during inspection • In noticeably eroded and bare areas, repair and reseed to establish new ground cover. • Maintain vegetation at approximately 6 inches around perimeter of basin. • Immediately after the basin is established, the vegetation on all slopes should be watered twice weekly if needed, until the vegetation becomes established (commonly six weeks). • Examine inlet pipes, riser and outlet pipes for structural failure and replace as needed. S:\1517\0210 - CAT Clayton Test Area\40-Permit\Phase 2A\401 Submittal\O&MAgreement.Rev102510.doc • Sediment is to be removed from the basin when it accumulates to 50% of the basin volume or every four months. Remove the sediment and dispose of it in a location where it will not cause impacts to streams or the basin. • Consult a professional to control and remove algal growth if greater than 50% of surface area is affected. • If cattails, phragmites or other invasive plants cover 50% of the basin surface, remove the plants by wiping them with pesticides (do not use spray). • No portion of the basin should be fertilized after the first initial fertilization that is required to establish the growth on slopes. • Keep outlet and flow sputter device free from debris and sediment that may clog or impeded flow. • If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain should be minimized to the maximum extent practical. • Annually, a geotechnical engineer should inspect the embankment. Level Spreader • Level Spreader shall be inspected quarterly or after every storm event greater than one inch. • Repair level lip if there are signs of settling, undercutting, erosion or other damage. • Remove trash and debris if present during inspection • Remove trees or shrubs that have grown in the level lip or in vegetated filter downstream of level lip. • Repair any areas of erosion or gulley formation. Downstream Vegetated Filter • Vegetated filter shall be watered twice weekly if no rainfall occurs until newly planted vegetation is established. Lime and a one-time fertilizer application may be used. • Vegetated filter shall be inspected quarterly or after every storm event greater than one inch. • In noticeably eroded and bare areas, repair and reseed to establish new ground cover. • Vegetated filter shall be aerated and reseeded annually to maintain a dense growth of vegetation. Additionally, pH shall be tested annually and lime added is necessary. • Two to three times a year, vegetation shall be mowed and the clippings harvested to promote the growth of thick vegetation with optimum pollutant removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and may be allowed to grow as tall as 12 inches. • Remove any nuisance vegetation that may be choking out desirable species. S:\1517\0210 - CAT Clayton Test Area\40-Permit\Phase 2A\401 Submittal\O&MAgreement.Rev102510.doc I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Project name: Caterpillar Core PDC Test Area Basin ID: All Scour Holes, Upstream Vegetated Filters, Permanent Sediment Basins, Level Spreaders and Downstream Vegetated Filters Print name: _? /` 5kem'z 6,- Title: Address: 1 11, 7 -,?)6 NZ Fe-zsi" G?ir?y71?•z . _X-le -27,5-)- 7 Phone: Signatu Date: 6i q a Notary Public for the State of G , County of 1rG d , do hereby certify that r personally appeared before me this day of /4 and acknowledge the due execution of the forgoing pond maintenance requirements. Witness my hand and official seal, I SEALr afGG?a , My commission expires S:\1517\0210 - CAT Clayton Test Area\40-Permit\Phase 2A\401 Submittal\O&MAgreement.Rev102510.doc .,3 ?? Loly