1 Common Issues on Site Re-certification Training For Level IA Fundamentals Certified Personnel Issued May 2009.

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Presentation transcript:

1 Common Issues on Site Re-certification Training For Level IA Fundamentals Certified Personnel Issued May 2009

2 Overview 1.Maintenance 2.BMPs not installed according to approved set of plans 3.BMPs not installed per specifications from the Manual for Erosion and Sediment Control in Georgia

3 Maintenance Ds1 (Disturbed area stabilization with mulching) –Check for 90% cover or greater of the soil surface –Not older than six months –Has proper depth for type of mulch used

4 Maintenance Ds2 (Temporary seeding) –Temporary summer grasses need to be replanted with winter grasses for adequate coverage and vice versa.

5 Maintenance Ds3 (Stabilization with permanent vegetation) –100% of the soil surface is uniformly covered in permanent vegetation or equivalent permanent stabilization measures such as Rip rap Gabions Permanent mulches Geotextiles with a density of 70% or greater

6 Maintenance Ds4 (Stabilization with sodding) –Re-sod areas where adequate stand of sod is not obtained –New sod should be mowed sparingly –Grass height should not be cut less than 2”-3” or as specified –Fertilize grasses in accordance to soil tests

7 Maintenance Sd 1 (Sediment Barrier) –Sediment shall be removed once it has accumulated to one-half the original height of the barrier. –Filter fabric shall be replaced whenever it has deteriorated to such an extent that the effectiveness of fabric is reduced (approximately six months).

8 Silt fence in need of maintenance

9

10 Maintenance Co (Construction Exit) –The exit shall be maintained in a condition which will prevent tracking or flow of mud onto public rights-of-way.

11 Construction Exit

12

13 Maintenance Rt (Retrofitting) –Retrofit structures shall be kept clear of trash and debris. –Will require continuous monitoring and maintenance, which includes sediment removal when one-third of the sediment storage capacity has been lost. –The structure is temporary on a permanent storm water structure. –Retrofit must be removed after permanent stabilization.

14 Retrofitted structure in need of maintenance

15 Maintenance –Repair all damages caused by soil erosion or construction equipment at or before the end of each working day. –Sediment shall be removed from the basin when it reaches the specified distance below the top of the riser (1/3 full). –Sediment shall not enter adjacent streams or drainage ways during sediment removal or disposal. Sd3 (Temporary Sediment Basin)

16 This example shows the clean out elevation as should be shown on the details for an Sd3

17

18 Maintenance St (Storm Drain Outlet Protection) –Inspect riprap outlet structures after heavy rains to see if any erosion has taken place or if stones have dislodged. Immediately make all needed repairs to prevent further damage.

19 Storm drain outlet protection in need of maintenance

20 Good St outlet protection

21 Maintenance Sd2 (Inlet Sediment Trap) –The trap shall be inspected daily and after each rain and repairs made as needed. –Sediment shall be removed when the sediment has accumulated to one-half the height of the trap. –Sediment shall be removed from curb inlet protection immediately.

22 Inlet sediment trap in need of maintenance

23 Inlet sediment trap in need of maintenance

24

25 Maintenance Sd2 (Excavated Inlet Sediment Trap) –Sediment shall be removed when one-half of the sediment storage capacity has been lost to sediment accumulation.

26

27 Maintenance Rd (Rock Filter Dam) –Rock dams should be removed once disturbed areas have been stabilized. –Sediment shall be removed at one-half of the original height of the dam. –Periodic inspection and maintenance must be provided.

28

29 Maintenance Fr (Filter Ring) –The filter ring must be kept clear of trash and debris. This will require continuous monitoring and maintenance, which includes sediment removal when one-half full. –Structures are temporary and should be removed when the land disturbing project has been stabilized.

30 Filter Ring

31 Maintenance Dn1 (Temporary Downdrain Structure) –Inspect the slope drain and supporting diversion after every rainfall and promptly make necessary repairs. –When the protected area has been permanently stabilized and the permanent stormwater disposal system is fully functional, temporary measures may be removed, materials disposed of properly, and all disturbed areas stabilized appropriately.

32

33 Good Dn1

34 BMPs not installed according to the approved plans Every site must have an approved set of plans. Plans should be on site and followed at all times. If the approved plan no longer meets the conditions of the site it is the responsibility of the primary permittee contact the design professional and have the plans amended. If there is a significant change or a change made regarding the hydraulic component the revised plan must be submitted to the appropriate authority for review.

35 WHAT SHOULD BE DONE IN THIS SITUATION? Example: John Smith grading company is preparing to develop the site. The plan shows: – Sd3s on the initial, intermediate and final phases. –Huge cut and fill slopes, which would cause the site to slope to the left where there is already a Sd3. –The plan does not address the LIA storm water ordinance which would require a storm water pond with a Rt.

36 What to do next The primary permittee must meet with the design professional to make changes to the plans, to addresses the appropriate amounts of discharge. The primary must resubmit the plans for review, since changes to the hydraulic component are necessary.

37 BMPs not being installed per specifications The Manual for Erosion and Sediment Control in Georgia has design criteria for each BMP. These details must be followed when installed.

38 Most common BMPs not installed correctly Cd (Check dams) –Often times the stones are left as they are when dumped, leaving the center of the check dam higher than the sides. This diverts water around the sides causing more erosion and ultimately more costs to the developer.

39 Most common BMP’s not installed correctly Co (Construction Exit) – Is often seen without underlayment fabric. This allows the rock to sink with high traffic causing more mud to get on the road.

40 Most common BMPs not installed correctly –These sediment storage structures are commonly seen but seldom installed correctly –This is because the emergency spillways are very seldom installed correctly, if at all. –Solution: Put in the emergency spillway with the underlayment fabric under the rock. These details are to be shown with every Sd3 calculation Sd3 (Temporary Sediment Basin)

41 What is wrong with this picture?

42

43

44

45 These most common BMPs are easily taken care of when installed correctly. Proper installation and maintenance is key. A few extra minutes could save you hours in the future.

46