3874.1SCOPE
Provide filter berms to slow, filter, and divert storm water runoff and other pollutant water .
3874.2REQUIREMENTS
Provide the following types of filter berms. Dimensions may vary by the C ontract: A Type 1 — Compost Provide compost berms meeting the following requirements and characteristics:
(1)Grade 2 Compost per 3890, “Compost”
(2)Trapezoidal shape with 5 foot base width
(3)Minimum height 2 feet in loose volume
(4)2:1 (Vertical:Horizontal) side slopes
B Type 2 — Slash Mulch Provide slash mulch berms meeting the following requirements and characteristics:
(1)Type 5 Mulch per 3882, “Mulch Material”
(2)Trapezoidal shape with 5 foot base width
(3)Minimum height 2 feet in loose volume
(4)2:1 (Vertical:Horizontal) side slopes
C Type 3 — Rock Weeper System Provide rock weeper systems meeting the following requirements and characteristics:
(1)Type 4 Geotextile Fabric per 3733, “Geosynthetic Materials”
(2)Trapezoid shape with 8.0 foot base width
(3)Maximum height 2.0 feet.
(4)2:1 (Vertical:Horizontal) side slopes
(5)Front half composed of coarse filter Aggregate per 3149.2H, “Coarse Filter Aggregate”
(6)Back half composed of Class I Riprap per 3601, “Riprap Material.”
D Type 4 — Topsoil Provide topsoil filter berm meeting the following requirements and characteristics:
(1)Topsoil excavation Material per 2106, “Excavation and Embankment – Compacted
Volume Method”
(2)Trapezoid shape with 7 foot base width
(3)Minimum height 2 feet
(4)2:1 (Vertical:Horizontal) side slopes
E Type 5 — Rock Provide rock filter berm meeting the following requirements and characteristics:
(1)Type 4 Geotextile fabric per 3733, “Geosynthetic Materials,” as a liner
(2)Class II Riprap per 3601, “Riprap Material”
(3)Trapezoid shape with 5 foot base width
(4)Maximum Height 2.0 feet
(5)2:1 (Vertical:Horizontal) side slopes
3874.3SAMPLING AND TESTING – BLANK
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Source: Minnesota Standard Specifications for Construction, 2025 Edition. Pages 1038–0 of 1,081.
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