11310 EVERGREEN WAY 2018-01-01 MF Import

i � � Mr. Bruce Vandervvail - . _, April 16, 2U08 �I _, Dra e I Smface Flnal exterior grades should promote free and positive drainage away from the new building at all dmes. Water must nat be atlowed to pond or collect adjacent foundations � i or within the immedlate building area. We recommend providing a gradient of at least three percent for a minimum dfsmncF of ten feet from the building perimeter, excePt in paved locatlons. In paved locatlons, a minimum gradient of one percent should be provided, unless provisions are induded for collecdon and disposal of surface water ad)acent the structure. . � 5'ubsmface We recommend installing continuous drains along the outside lower edge of the building perimeter. The foundatlon dreins and roof downspouts should be Ughtlined , separately to approved discharge facilities. Subsurface drains must be laid with a gradient sufficient to promote positive flow to a controlled pofnt ef approved discharge. Pavements New pavements should be constructed on subgrades prepared as described in the Site Preparatlon and Grading sectlon. No over-excavadon of the old pre-existlng fllls will be needed for the pavement subgrade unless soft areas are enrnuntered. However, regardless of the reladve compaction achfeved, the subgrade must be in a firm and relatively unyfelding conditlon prlor to paving. The subgrade should be proof rolled with heavy construction equipment to verify this condition. The appropriate pavement sedion depends upon the supporting capabflity of the subgrade soils and the tra�c conditions to which it will be subjected. We expect that traffic will mainly consist of light passenger and commerdal vehicles with occasional heavy t�affic in the form of large deiivery trucks and trash removal vehicles. Based on this information, with a stable subgrede prepared as recommended, we recommend the following pavement sections for light automobile traffic and parking areas: . Two inches of asphalt concrete (AC) over six inches of crushed rock base (CRB) . Two inches of AC over 4.5 inches of asphalt treated base (ATB) • For heavy truck traffic areas and driveways, the following sections are recommended: . Three inches of AC over six inches of CR8 . Three inches of AC over 4.5 inches of/,TB Project No. 1745 Page Np�9� 1� t