Cepsci

1972 clean water act Administered by the US environmental protection agency (EPA) Created the NPDES 1987 Amendment to CWA CALLED WATER QUALITY ACT NPDES in south carolina South Carolina is NPDES delegated state. NPDES regulations are administered by SCDHEC CGP authorizes stormwater discharges from construction sites Who must obtain NPDES coverage land disturbing activities greater than or equal to 1 acre -land disturbance less than 1 ac within 1/2 miles of water body in SC costal zone NPDES permits are issued to operator-person or company for a particular discharge primary permittee -has day to day operational control to ensure compliance with SWPP -typically the owner or developer primary permittee responsibilites submit NOI, Preparation of the C_SWPPP Secondary permittee individual lot owner or residential builder that conducts land disturbing activity limited to an individual lot or group of lots as part of approved LCP of development contractors must on Contractor Certification- D-0437 On-Site SWPPP SCDHEC CGP, NOI, NPDES coverage approval letter, Contractor Certifications, Local Approvals, USACE approvals, Critical area permit(coast) OS_SWPPP a copy of signed and certified SWPPP, NOI, and CGP coverage letter from DHEC must be retained at site or electronically accessible minor modification to ON-SWPPP minor modifications made directly in the field,do not need approval by DHEC- additional BMP's, removal of disturbed areas major modifications to OS-SWPPP must be made by qualified individual and submitted to DHEC or appropriate delegated entity for approval Phased plan requirement 5 include a phased stormwater management plan which identifies all BMP's and grading work conducted during a specific portion of the sites construction sequence. Each phase identified on at least one separate plan sheet. Phased plan requirement 10 but 5 acres at least two separate plan phases are required - initial land disturbance phase - stabilization phase Phased plan requirement ≥ 10 acres at least 3 separate plan phases are required - initial land disturbance phase - construction phase - stabilization phase All compliance inspection must include invesg. of, at a minimum of 5 of the following 1. areas of site disturbed by construction activity and areas used for storage of materials exposed to precipitation 2. stormwater conveyance systems for evidence of sediment 3. BMP's identified in OS-SWPPP 4. Discharge location to investigate if sediment leaving site, or if such locations are inaccessible, nearby downstream location if possible. 5. Where vehicles enter or exit site for evidence of off-site sediment tracking. inspection frequency after construction begins at least once a week or within 24 hours of end of storm event 0.5 inches Inspection frequency for sites that have reached temporary stablization Once every month Linear site inspection linear activites may limit access to disturbed areas, in such cases representative inspections may be performed representative inspections (linear site inspection) personnel must investigate BMP's along the site for 0.25 miles above and below each access point where the site intersects with -roadway - undisturbed right of way - other similar feature- Condition along each inspected segment are considered "respresentative" along that reach of construction permittees must record rainfall events of 0.5 inches or greater where should rainfall records be kept maintained in rain log located as part of the OS-SWPPP Inspection reports of rainfall must be reported on each weekly inspection report and maintained in rain log For each compliance inspecton a report must be completed and include at a mininum 1. Inspection date 2. Name, title, qualification of inspector 3. Weather information for period since last inspection 4.Weaher information and description of any discharges occurring at time of inspection. 5. Locations(s) of discharges of sediment or other pollutants leaving the site. 6. Location(s) of BMP's that need maintenance only. 7. Location of any BMPs that failed to operate as designed or have proven inadequate for a particular location. 8. Location where additional BMPs are needed that did not exist at the time of inspection. 9. Corrective action required including any changes to the OS-SWPPP necessary. 10. Site name, operator name and permit identification number. 11. Compliance inspectors must sign inspection reports. (SEC. 4.2.H) if inspection indicates a BMP has been used inappropriately or incorrectly, the permittee must address replacement or modification within 48 hours