AIA 101 Agreement 08302024 - Laserfiche WebLink

Home Browse Search

June 13, 2023 HWA Project No. 2022-188-21 should be excavated a minimum of 22 inches below the proposed top of pavement subgrade to accommodate the proposed pavement section, as discussed in Section 4.11.3. The subgrade should then be proof rolled using a with a heavyweight smooth drum roller (on static mode) under the observation of the geotechnical engineer. Any subgrade areas that appear to be unstable or incapable of supporting construction equipment or traffic should be stabilized as described below. We recommend that after subgrade proof rolling is conducted as described above, unstable areas of the subgrade be sub -excavated at least 12-inches (if necessary depending upon finish grade) then covered with a woven geotextile fabric consisting of Tensar HP 570 or equivalent, followed by a layer of Tensar Triax 160 geogrid prior to placement of 12-inches of compacted CSBC. All other pavement subgrade areas should be covered with a woven geotextile fabric, such as Tensar HP 570, or equivalent, prior to placement of structural fill and pavement layers. Material used to raise site grades, or placed directly under pavement structure is classified as structural fill. Imported structural fill should consist of either Crushed Surfacing Base Coarse or Select Borrow depending on application as specified herein and meeting the requirements of WSDOT Standard Specifications Section 9-03.9(3) and 9-03.14(2), respectively. 4.11.2 Design Traffic Volume Traffic information, provided by SCS, Inc., indicated that the site could be divided into 4 discrete zones that support varying traffic loads (K. Shah, electronic communication, 2023) as described below. Southwest Area: This area includes the tire recycling area and consists of a paved rectangular area situated just of the compost area. The area serves as a laydown and loading area for tires. The pavement will support pickups, pickup with trailers, and occasional heavyweight 40 cyd trailers. Based on the traffic data provided we estimate a total design ESAL's factor of 2,337 for this area as presented in Table 2. Southeast Area: The southeast area encompasses the recycle area which consists of a broad paved area where a series of containers are arranged within a median to accept paper, glass, metal and other recyclable materials. The area also includes access and parking for the MRW and administration buildings. The pavement will support pickups and passenger vehicles, and occasional heavyweight roll-on/roll-off trucks and 24-foot long 3-axle trucks. Based on the traffic data provided we estimate a total design ESAL's factor of 275,000 for this area as presented in Table 2. Northeast Area: The paved area includes the scale and transfer station facilities situated in the northeastern portion of the site. All vehicles carrying loads that require a tipping fee will need to 2022-188-21 KCTS — Final Geotechnical Report 16 HWA GEOSCIENCES INC.