3301 SEAWAY BLVD WHOLE SITE 2025-10-30

Pond Plans: The diameter of the turn -around area at the bottom of the pond must be 110' (inside turning radius of 40' plus 15' wide access road = 55' outer radius). The proposed diameter of the turn- around area at the bottom of the pond is only 90' in diameter. 2. Per the Planned Action and SEPA determination, a representative of the geotechnical firm shall be present to witness/verify all sensitive aspects of the construction of the drainage facilities on the site and to ensure the facilities are constructed in strict accordance with the approved design. A note indicating this requirement must be added to the pond construction plans and other locations as appropriate. 3. Cross-section A -A on sheet C6/13 should be extended to the pavement on the other side of the modular block wall that is located approximately 15' from the north property line on the adjacent development. The pavement elevation on the other side of this block wall is at 413.12'; the elevation of the catch basin shown on the plan view is 411.62'. 4. The pond liner must extend to at least the freeboard elevation of the pond — not just to the maximum design water level — and must be keyed in at the top to prevent liner slippage on the side slopes. 5. The geomembrane liner must be protected from puncture, tearing, and abrasion by installing geotextile fabric both above and below the geomembrane liner. The geotextile fabric must meet the properties given in Table 2.5 on pages 2-11 and 2-12 of Volume III, which is included below for easy reference. Table 2.6 Geotextile Properties for Impermeable Liner Protection Geotextile Property Test Method Geotextile Property Requirements' Grab Tensile Strength, min. in ASTM D4632 250 Ibs min. machine and x-machine direction Grab Failure Strain, in machine and ASTM D4632 >50 percent x-machine direction Seam Breaking Strength ASTM D4632 and 220 Ibs min. (if seams are present) ASTM D4884 (adapted for grab test) Puncture Resistance ASTM D4833 125 Ibs min. Tear Strength, min. in machine and x- ASTM D4533 90 Ibs min. machine direction Ultraviolet (UV) Radiation ASTM D4355 50 percent strength stability retained min., after 500 hrs. in weatherometer AOS ASTM D4751 0.43 mm max. (#40 sieve) Water Permittivity ASTM D4491 0.5 sec -1 min. 'All geotextile properties are minimum average roll values (i.e., the test result for any sampled roll in a lot shall meet or exceed the values shown in the table).