6202 ASSOCIATED BLVD Geotech Report 2022-10-25

Proposed Everett Warehouse Zi Project No. 2152.01 pperGeo March 5, 2019 vault walls. We should be consulted for surcharge recommendations if the footings cannot be located below this 1H:1V plane. On -Grade Concrete Slabs The following sections provide recommendations for on -grade floor slabs. Subgrade Preparation and Modulus of Subgrade Reaction Subgrades for on -grade slabs should be prepared in accordance with the Site Preparation and Structural Fill sections of this report. For slab subgrades prepared in accordance with this report, a modulus of vertical subgrade reaction of 200 pounds per cubic inch (pci) may be used for design. ab Base Material To provide a capillary break, uniform slab bearing surface, and a minimum subgrade modulus of 200 pci, we recommend on -grade slabs be underlain by a 6-inch thick layer of compacted, well -graded granular fill. In accordance with the recommendations of the American Society of Concrete Contractors and the American Concrete Institute publication ACI 302.111-04, we recommend slab base material meet the requirements of ASTM Size Number 10 aggregate as defined in ASTMD448-12 with less than 5 percent passing the No. 200 sieve. The specific gradation limits of the recommended slab base material are provided in the following table. Sieve Size % Passing 3/8 inch 100 No. 4 85 min / 100 max No. 100 10 min / 30 max No. 200 5 max Alternative capillary break materials should be submitted to the geotechnical engineer for review and approval before use. Vapor Retarder The use of a vapor retarder should be considered beneath concrete slabs on grade that will be covered with wood, tile, carpet or other moisture sensitive or impervious coverings, or when the slab will support equipment sensitive to moisture or is otherwise considered moisture -sensitive. When conditions warrant the use of a vapor retarder, the slab designer and contractor should refer to ACI 302 and/or ACI 360 for procedures and cautions regarding the use and placement of a vapor retarder. Permanent Drainage Considerations Surface Draina!e Final site grades should be sloped to carry surface water away from buildings and other drainage -sensitive areas. Additionally, site grades should be designed such that concentrated runoff on softscape surfaces Page 14