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Construction Activities | Section 1: Erosion & Sediment Control | 351

SWPPP Cut Sheet:

PURPOSE & DESCRIPTION

Filtrexx ® Temporary seeding is a temporary vegetation and erosion control practice used on hill slopes to stabilize disturbed soils on and around construction activities. Temporary seeding is generally used for rapid vegetation establishment on disturbed or erodable soils, and are not to be used as an erosion control blanket. Temporary seeding

consists of a ½ in to ¾ in (12-20mm) deep layer of Filtrexx ® GrowingMedia tm or 70 to 100 cubic yards/ acre (135-193 cubic m/ha) mixed with a specifed seed mix and applied to hill slopes with pneumatic blower trucks or similar equipment.

APPLICATION

Filtrexx ® Temporary seeding is generally used for temporary vegetation for erosion control on disturbed, bare, or highly erodable soils during land disturbing and construction activities. Stabilization using temporary vegetation is generally required for: • disturbed soils that will undergo future disturbance,

• cut and fll slopes under construction, • soil storage areas and stockpiles,

• permanent vegetation establishment that requires a nurse crop,

• stabilization of temporary runoff diversion devices, dikes, and sediment containment systems. • curbside buffers on residential construction lots prior to vertical construction.

Filtrexx ® Temporary Seeding

Vegetation & Erosion Control Technology

Permanent stabilization practices, such as erosion control blankets, anchoring and sod are not typically used for these applications; however, they may be used selectively with temporary vegetation practices. Temporary seeding is best utilized on bare soils in excavated or fll areas immediately after temporary or fnal grading is fnished. It should be noted that Temporary seeding provides little erosion control until vegetation is established, this should be considered in the planning and design process. Slopes greater than 4:1 should be vertically tracked to aid in catching and stabilizing Temporary seeding application prior to germination. Slopes greater than 3:1 should apply a tackifer with the Temporary seeding to increase stability. Slopes greater than 2:1 should utilize erosion control blankets or turf reinforcement mats. Other erosion control practices should be utilized if soil erosion control/ slope stabilization is required prior to vegetation establishment.

Although most specifcation and design manuals include fertilizer recommendations or requirements for vegetation, mineral nutrients from fertilizers may not be preferable where vegetation sustainability and water quality are a concern. Temporary seeding provides organic nutrients which are slow release, provide plant micronutrients, and are less likely to be transported in storm runoff to receiving waters – which can lead to pollution and eutrophication of waterways. In site sensitive areas where nutrient runoff is a concern, Temporary seeding may release

Section 1: Erosion & Sediment Control – Construction Activities