Greenville County Storm Water Management Program Greenville County, SC Land Development Division NPDES MS4 Permit Implementation Construction/Post Construction

Greenville County Storm Water Management ProgramGreenville County Storm Water Management Program

Greenville County, SCLand Development DivisionNPDES MS4 Permit ImplementationConstruction/Post Construction Program

K.F. Holbrook, PE Woolpert, Inc.

Construction Site Runoff

Stormwater Management in Greenville County

May 30, 2007

Furman University, Greenville, SC

Future of the Construction and Post Construction Water Quality Program


In the Beginning (1994)

Simple ProgramSimple Program Followed State Law and RegulationsFollowed State Law and Regulations Peak rate controlPeak rate control Velocity controlVelocity control Sediment controlSediment control Program operated by the SWCDProgram operated by the SWCD


Program Evolution

In 2000 Greenville County issued MS4 Storm Water PermitIn 2000 Greenville County issued MS4 Storm Water Permit Ordinance revised to include authorities for implementationOrdinance revised to include authorities for implementation Program audit to set baseline performanceProgram audit to set baseline performance Automated permit tracking system implementedAutomated permit tracking system implemented Computerized field inspection systems implementedComputerized field inspection systems implemented EPA evaluation of the MS4 programEPA evaluation of the MS4 program Flood protection projects initiatedFlood protection projects initiated Program reorganized into Public WorksProgram reorganized into Public Works Second cycle NPDES permit effective July 2007Second cycle NPDES permit effective July 2007 TMDL’s developed for Enoree and ReedyTMDL’s developed for Enoree and Reedy Ordinance revisions requiredOrdinance revisions required Cites become co-permitteesCites become co-permittees







Process

Project Application logged upon receiptProject Application logged upon receipt Assigned to Plan Review Assigned to Plan Review Plan Review conducted comments providedPlan Review conducted comments provided

For Subdivisions three iterations before permitFor Subdivisions three iterations before permit For Commercial two iterations before permitFor Commercial two iterations before permit

Preconstruction meeting prior to issuing permitPreconstruction meeting prior to issuing permit SCDHEC approval for NPDES requiredSCDHEC approval for NPDES required Permit issued Permit issued Plans and Documents handed off to the inspectors Plans and Documents handed off to the inspectors

for follow upfor follow up Site inspections for compliance beginSite inspections for compliance begin Each site is inspected once every two weeksEach site is inspected once every two weeks Upon final stabilization project is closed and CO Upon final stabilization project is closed and CO

issuedissued

Field General Score

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

4413

4445

4479

4600

9732

32

9837

16

9838

23

9838

52

9838

77

9939

60

9940

12

9940

50

9940

96

9941

56

9942

39

9942

53

9943

19

9943

56

Site ID Number

Fie

ld G

ener

al S

core

(%

)


GREENVILLE COUNTY STORMWATER PROGRAMGREENVILLE COUNTY STORMWATER PROGRAM

YEARYEAR # APPLICATIONS# APPLICATIONS# #

PROJECTSPROJECTS# #

INSPECTIONSINSPECTIONS

20032003 303303 169169 955955

20042004 311311 175175 25752575

20052005 305305 155155 31473147

20062006 322322 114114 20302030

YEARLY AVERAGEYEARLY AVERAGE 310310 153153 21172117

Overall Site BMP Score

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

4413

4445

4479

4600

9732

32

9837

16

9838

23

9838

52

9838

77

9939

60

9940

12

9940

50

9940

96

9941

56

9942

39

9942

53

9943

19

9943

56

Site ID Number

Sit

e B

MP

Sco

re (

%)

Field General Score

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

4413

4445

4479

4600

9732

32

9837

16

9838

23

9838

52

9838

77

9939

60

9940

12

9940

50

9940

96

9941

56

9942

39

9942

53

9943

19

9943

56

Site ID Number

Fie

ld G

ener

al S

core

(%

)




PROJECTS BY DISTURBED AREAPROJECTS BY DISTURBED AREA

DISTURBED AREADISTURBED AREA # PROJECTS# PROJECTS

0 - 4.99 Acres0 - 4.99 Acres 374374

5 - 9.99 Acres5 - 9.99 Acres 8484

10 - 14.99 Acres10 - 14.99 Acres 6767

15 Acres and larger15 Acres and larger 9696

TOTAL PROJECT AREATOTAL PROJECT AREA 25,792 ACRES25,792 ACRES

TOTAL REPORTED DISTURBED AREATOTAL REPORTED DISTURBED AREA 5,068 ACRES5,068 ACRES


More Stats

YEARYEAR # # COMPLAINTSCOMPLAINTS

20042004 6969

20052005 132132

20062006 6666


What is in the Future

Staff analysis and assessment for meeting program needsStaff analysis and assessment for meeting program needs New enforcement procedureNew enforcement procedure Improved complaint managementImproved complaint management Improved permit and inspection trackingImproved permit and inspection tracking Third party inspection requirementsThird party inspection requirements New application/inspection fee structureNew application/inspection fee structure Implementation of TMDL requirementsImplementation of TMDL requirements New ordinance revisions for water qualityNew ordinance revisions for water quality Credit policy modifications for enhanced maintenanceCredit policy modifications for enhanced maintenance Updated design manualUpdated design manual Design tool developmentDesign tool development BMP developmentBMP development

Greenville County Storm Water Management ProgramGreenville County Storm Water Management Program Storm Water Management Design Manual

Greenville County Storm Water Management Design Manual


Question/Comments



Field Protocol

2 Field Auditors2 Field Auditors Traversed entire site using the original Traversed entire site using the original

erosion control plans as a guideerosion control plans as a guide

Collect Data on Rugged Pentop ComputersCollect Data on Rugged Pentop Computers Store data in database specifically design for Store data in database specifically design for

field reviewfield review

Digital Pictures of Site and BMPsDigital Pictures of Site and BMPs



Sediment Basins



Sediment Basins



Basin Outlet Structures



Basin Outlet Structures



Temporary Sediment Traps



Silt Fence



Rock Ditch Checks



Riprap or Aggregate



Outlet Protection



Stabilized Construction Entrance



Storm Drain Inlet Protection



Pipe Slope Drains



Runoff Control Measures



Straw and Hay Bale Applications
