B01 Attachment J10 25.10.09 Chinle SU - Helipad Design - RFI A0001 SK-1.pdf

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Navajo Area Chinle, Pinon, Tsaile Helipad Construction
Solicitation number
75H70125R00053
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This is a technical design document for a Riprap Placement Detail for the Chinle Su - Helipad Design project located in Arizona. The document provides specific engineering specifications for rock riprap installation, including critical requirements such as rock placement, gradation, and material characteristics. Key technical specifications include: (1) riprap must be placed at grade with a 20% variance, (2) rocks must be angular with no more than a 3:1 flat/elongated ratio, (3) D50 rock size is specified as 6", (4) a Class 'A' geosynthetic fabric must be installed per MAG Specifications 796.2.3, and (5) rock color must be coordinated with the architect and Contracting Officer's Representative (COR). The document is prepared by DOWL, located in Phoenix, Arizona, with a project date of 10/09/2025 and a reference number of C102, specifically for the Civil SK-1 drawing.

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CHINLE SU - HELIPAD DESIGN

PINON RIPRAP DETAIL

480-753-0800

4686 East Van Buren Street, Suite 175 Phoenix, Arizona 85008 RE: C102 CIVIL SK-1

20% OF D50

VARIANCE

HAND-PLACED

1. TOP OF RIPRAP TO BE AT GRADE AS INDICATED ON PLAN (WITHIN

VARIANCE GIVEN). RIPRAP PLACED ABOVE FINAL GRADE WILL NOT

BE ACCEPTED.

2. RIPRAP SHALL BE ANGULAR AND SHALL NOT EXCEED 3:1 RATIO FOR

FLAT AND ELONGATED PIECES (ASTM D4791). RIVER ROCK WILL NOT

BE ACCEPTED.

3. INSTALL FILTER FABRIC PER MANUFACTURERS RECOMMENDATIONS.

4. RIP-RAP CONSTRUCTION PER MAG SPECIFICATIONS SECTION 220.

5. RIPRAP COLOR TO BE COORDINATED WITH ARCHITECT AND COR.

6. D50 SIZE TO BE 6".

SIZE PERCENT FINER

0.2D50 0

ROCK RIPRAP GRADATION

NOTES:

2D50

0.5D50

0.75D50

1.0D50

1.5D50

2.0D50

CLASS 'A' GEOSYNTHETIC FABRIC

PER MAG SPECIFICATIONS 796.2.3

1 DETAIL - RIPRAP PLACEMENT

NTS

File details come from the government source that posted it. Updated .