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2025 Chaplain Blowdown Salvage Timber Sale <br />4-61 SUBGRADE COMPACTION: Constructed subgrades shall be compacted by routing equipment over the <br />entire width. <br /> <br />SECTION 5 - DRAINAGE <br />5-5 CULVERTS: Culverts shall be installed as part of this contract. Culverts shall be installed concurrently with <br />subgrade work and shall be installed before subgrade compaction and rock application. Culvert locations and <br />the minimum requirements for culvert length and diameter are designated on the MATERIALS LIST. <br />Culvert, downspout, and flume lengths shall be adjusted to fit as-built conditions and shall not terminate <br />directly on unprotected soil. Culverts shall be new and meet the material specifications in Clauses 10-15 <br />through 10-23. <br />5-11 UNUSED MATERIALS CITY PROPERTY: On required roads, any materials listed on the MATERIALS <br />LIST that are not installed shall become the property of the City. Purchaser shall stockpile materials as <br />directed by the Contract Administrator. <br />5-15 CULVERT INSTALLATION: Installation shall be in accordance with the CULVERT AND DRAINAGE <br />SPECIFICATION DETAIL and the National Corrugated Metal Pipe Association’s "Installation Manual for <br />Corrugated Steel Drainage Structures." <br />5-16 APPROVAL FOR LARGER CULVERT INSTALLATION: Installation of culverts 36 inches in diameter <br />and over shall be subject to written approval by the Contract Administrator before making backfill. <br />5-17 CROSS DRAIN SKEW AND SLOPE: Cross drains, on road grades in excess of 3%, shall be skewed at least <br />30 degrees from perpendicular to the road centerline, except where the cross drain is at the low point in the <br />road, culverts shall not be skewed. Cross drain culverts shall be installed at a slope steeper than the incoming <br />ditch grade, but not less than 3% or more than 10%. <br />5-25 CATCH BASINS: Catch basins shall be constructed to resist erosion in accordance with the CULVERT <br />AND DRAINAGE SPECIFICATION DETAIL. Minimum dimensions of catch basins are 2 feet wide and 4 <br />feet long with backslopes consistent with Clause 4-5 CUT SLOPE RATIO. <br />5-26 HEADWALLS FOR CROSS DRAIN CULVERTS: Headwalls shall be constructed in accordance with the <br />CULVERT AND DRAINAGE SPECIFICATION DETAIL at all cross drain culverts. Rock used for <br />headwalls shall weigh at least 50 pounds. Rock shall be placed on shoulders, slopes, and around culvert inlets <br />and outlets. Rock shall not restrict the flow of water into culvert inlets or catch basins. No placement by end <br />dumping or dropping of rock shall be allowed. <br />SECTION 6 – ROCK AND SURFACING <br />6-2 ROCK SOURCE ON CITY LAND: Rock used in accordance with the quantities on the TYPICAL SECTION <br />and MATERIALS LIST may be obtained from the following source(s) on City land at no charge to the <br />Purchaser. Use of material from any other source must have prior written approval from the Contract <br />Administrator. If other operators are using, or desire to use the rock source(s), a joint operating plan shall be <br />developed. All parties shall follow this plan. <br />Source Location <br />North Pit E-1300 Road, STA 2+40 <br />South Pit D-1360, STA 10+00