Correction, MG 3-31-15.

1.  Drainage Report:  If applicable complete the Drainage Certification found in the Drainage Design Guidelines Appendix C-3, along with backup calculations (areas and weighted coefficients) stamped by a civil Engineer (http://www.muni.org/Departments/works/project_management/Pages/Publications.aspx). Otherwise, Provide a drainage report prepared, signed and stamped by a civil engineer licensed in the State of Alaska per the 2007 DCM Ch:2.  Reference the 2007 Drainage Design Guidelines, Appendix A for preparation of a Drainage Report (follow the outline beginning on page A-3 and include relevant forms) to be submitted with the drainage and grading plan.  Please provide drainage calculation inputs and results from modeling on a CD upon request (EPA SWMM digital format or equivalent as applicable).

2.  The Engineer shall certify that the existing storm drain facility has sufficient capacity and is in sufficient condition for the proposed project.  DCM 2.2.D, 2.2.D.8, 2.4.B, 2.4.D.6, 2.4.F, 2.7.B.7,  DDG 5.9.1, 5.9.2.

3.  Ref. C-03, C-04 & C-05; An engineer faced with the task of designing traffic areas with frost-susceptible soils and a high moisture content can reap many benefits from the use of geotextile fabric in the design.  Where high soil moisture content occurs in F-3 and F-4 soils, geotextile fabric should be incorporated into the structural design section to separate structural fill from frost-susceptible soils.  Geotextile separation acts as a separator to prevent the pumping of frost-susceptible subgrade material into the gravel backfill, minimizing the contamination of gravel backfill and maintaining its support strength.

4.  Ref. C-08, C-10;  As submitted it is not clear what storm drain pipe exists and what is proposed.  Storm pipe shall be Type S Precoated Corrugated Metal Pipe (PCMP) or Type S Corrugated Polyethylene Pipe (CPEP).  DCM 2.7.B.

5.  Ref. C-10;  A manhole shall be installed at major junctions places where there are changes in vertical or horizontal alignment, and at locations where there are changes in pipe size or shape.  2007 DCM 2.7.D.1.

6.  Indicate the installation of storm drain pipe locator tape three feet below finish grade or two feet deep in the street structural section. MASS Section 20.13 Article 13.3.E, page 39 R2.

7.  Provide roof drain leader locations on the civil plans and/or tie-in to the storm drain facility (DCM 2.2.D.6).  Roof drainage concentrated by downspouts or similar devices shall not be directed across sidewalks, driveways, or parking areas (DCM 2.2.D.16).  Include inverts, minimum bury depth, type of pipe, diameter of pipe, type of connections and freeze protection (DCM Section 2.7).

8.  Ref. C-10; As proposed the storm drain connection appears to be located on an adjacent lot.  Please provide POA approval for this connection.

9.  The minimum diameter of storm drain pipe is 12 inches.  2007 DCM 2.7.B.2.

10.  PDCIVIL comments are incomplete pending further submittals.