96E03/29/06

S157-96E.doc

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  Use on all projects.

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**Section 157. - SOIL EROSION CONTROL**

**Construction Requirements**

**157.03 General.** [Delete the second paragraph and substitute the
following:]{.underline}

Standard erosion control devices are provided in the contract. Detail
site-specific measures for controlling erosion and submit to the CO for
acceptance prior to implementation. Provide working drawings and
associated data that do not exceed 24 by 36 inches in size. Allow 7 days
for acceptance of the drawings or a return for corrections. Include the
following in the detailed design:

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  List requirements for permits or other commitments after item (a).

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(1) Address contractual requirements for storm water runoff permits,
    environmental commitments, and other permit requirements here or in
    Subsection 107.01 or 107.10.

(2) Location of each proposed erosion control measure.

(3) Type of each erosion control measure.

(4) Quantities and estimated unit costs of proposed temporary erosion
    control devices to be implemented during construction.

(5) A schedule detailing coordination of erosion control measures with
    the various construction operations or stages. Include the
    furnishing, installation, maintaining, and removing of temporary
    devices and the installation of permanent erosion control features.

(6) A schedule outlining the proposed schedule of clearing and grubbing,
    excavation, embankment, and culvert operations such that the area of
    disturbed or erodible material is minimized. Schedule the work such
    that temporary and permanent erosion measures can be incorporated at
    the earliest practical time.

(7) Construction methods used in various items of work to minimize
    erosion.

[Add the following:]{.underline}

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  Disregard second sentence for small jobs.

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At least 5 days prior to the preconstruction conference, designate in
writing an Erosion Control Supervisor who is responsible for
implementing the requirements of this Section. Do not designate the
project superintendent as the Erosion Control Supervisor.

When temporary erosion control measures are required due to the
Contractor\'s negligence, carelessness, or failure to install permanent
controls as part of the work in a timely manner, provide temporary
measures at no cost to the Government.

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  Temporary or permanent turf establishment is required to protect
  against soil erosion. Be sure to include an item for temporary turf
  establishment, if its use can be anticipated. Include the following
  with all projects.

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**157.04 Controls and Limitations on Work.** [Delete paragraphs (c) and
(d) and substitute the following:]{.underline}

**(c)** Unless a specific seeding season is identified in the contract,
apply permanent turf establishment to the finished slopes and ditches
within 14 days according to Sections 624 and 625.

**(d)** Apply temporary turf establishment or other approved measures on
disturbed areas within 14 days after last disturbance, except where the
area will be redisturbed within 21 days after last disturbance or when
initial stabilization is precluded by snow cover or by seasonal arid
conditions in arid or semi-arid areas (average annual rainfall of 20
inches or less).

**157.12 Inspection and Reporting.** [Add the following:]{.underline}

Monitor the turbidity of waters adjacent to the project. Take turbidity
measurements using an HF-DRT 15CE turbidimeter or equivalent upstream of
the project and 500 feet downstream of the area of the highest
turbidity. If the measurements show an increase of 10 NTU or more,
immediately suspend operations in the vicinity of the problem area and
modify the erosion control measures to eliminate the cause of the high
turbidity. Include turbidity readings, locations, and actions taken, if
any, in inspection reports. Also provide documentation of meter
calibration.

**157.14 Acceptance.** [Add the following:]{.underline}

Soil erosion control will be evaluated under Subsection 106.02 based on
the demonstrated ability of the erosion control measures to result in
minimal soil erosion, sedimentation and/or siltation, and turbidity
increases within or adjacent to the project limits.