1 PART I
2
All materials in this presentation are taken from materials produced by: Georgia Soil and Water Conservation Commission 4310 Lexington Road P.O. Box 8024 Athens, GA 30603 706-542-3065 Fax 706-542-4242 www.gaswcc.org Field Manual for Erosion and Sediment Control In Georgia 2002 Subcontractor Awareness Seminar Issued August 2007 These materials do not provide credit for the Subcontractor Awareness Seminar as required by the Georgia Environmental Protection Department 3
Erosion and Sedimentation Georgia s Law is called the Erosion and Sedimentation Act. Erosion and sedimentation are two separate processes. If erosion is controlled, sediment is not produced. Therefore, to practice good erosion and sediment control (E&SC), emphasis has to be placed on controlling erosion at the source. Sediment control should be considered the last line of defense. Allowing any erosion to occur is the first step towards noncompliance. This means that Best Management Practices (BMPs) must be properly designed, installed and maintained in accordance with sound conservation and engineering principals. BMPs are vegetative measures and structural practices that control the erosion of soil and the resulting sedimentation. The law mandates that all BMPs stand up to a 25-year rainfall event or the landdisturber is subject to severe civil penalties. 4
If erosion is controlled, sediment is not produced. VEGETATIVE BUFFER If your erosion and sediment control plan does not show a vegetative buffer around a site but there is an area on the perimeter that does not require clearing, then save the existing vegetation! A good vegetative buffer 25-35 can trap 85-95% of the sediment in runoff water. If a site is properly engineered, cut and fill slopes can be mulched or vegetated daily. Mulch does not require water or fertilizer or lime. A good application of mulch can reduce soil loss by up to 98%. When in doubt, mulch! 5
6 Vegetation Buffers provide these benefits
7 A good vegetative buffer 25-35 can trap 85-95% of the sediment in runoff water.
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
Provides additional information concerning erosion and sediment control. 35
36
37
38
39
40
41
42
43
Disturbed Area Stabilization (With Mulching Only) 44
Mulching Process Install all other required BMPs first. Grade site, if possible, to permit the use of equipment for applying and anchoring mulch. Loosen compacted soil, if possible, to a depth of three (3) inches. Apply straw or hay uniformly, as shown in Table, by hand or mechanical equipment, and anchor by pressing into soil or using netting. Mulch on slopes greater than 3% should be anchored with emulsified asphalt (Grade AE-5 or SS-1) or other suitable tackifier. Wood waste on slopes flatter than 3:1 do not need anchoring. Mulch shall be applied to all disturbed areas left inactive for fourteen days. 45
Disturbed Area Stabilization (With Mulching Only) 46
Disturbed Area Stabilization (With Mulching Only) 47
48 Disturbed Area Stabilization (With Mulching Only)
49
Disturbed Area Stabilization (With Temporary Seeding) 50
Disturbed Area Stabilization (With Temporary Seeding) 51
Disturbed Area Stabilization (With Temporary Seeding) 52
53
Disturbed Area Stabilization (With Permanent Vegetation) 54
Disturbed Area Stabilization (With Permanent Vegetation) 55
56
EROSION CONTROL MATTING AND BLANKETS PURPOSE Reinforce turf. Reduce erosion. Reinforce channels. Provide protective covering. INSTALLATION Install on slopes steeper than 2.5:1 and greater than 10 feet in height and in areas of concentrated flow. Install according to approved plan, if shown. All mats and netting should be appropriately staked to prevent shifting. These materials must be installed according to the manufacturer s specifications. 57
58
TOPSOILING 59 Stripping depth of 4 to 6 inches is common and should be confined to the immediate construction area. Stockpiles may be vegetated and should not obstruct natural drainage or cause off-site environmental damage. If subsoil is composed of heavy clays, lime shall be spread at the rate of 100 pounds per 1,000 square feet. Subsoil should be loosened by discing or scarifying to a minimum depth of 3 inches to permit bonding of the topsoil to the subsoil. Tracking by a bulldozer is also adequate. Topsoil should be applied at a uniform depth of 5 inches (unsettled), but may be adjusted at the discretion of the engineer or landscape architect.
60
This completes Erosion and Sedimentation Part 1 For 1 Hour Continuing Education Credit. Continue to verification