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HomeMy WebLinkAboutCT 02-25; NORTH PARK AT LA COSTA; RE-REVISED PAVEMENT DESIGN REPORT; 2004-08-06• AGGREGATE BASE TRAFFIC SUBRADE A C THICKNESS THICKNES(2 TREIG4REA INDEX R:VALUE I, (INCHES) 1 (INCHES) Corte Tradition 5 0 14 4.0(1 6.0. All Stations. ..• ' City minimum Denotes Class 2Aggré6àte Base (R78, SE22). • ' All pavement installation, including preparation and compaction of subgrade, compaction of base material, and placement and rolling of asphaltic concrete shall be done in accordance with the City guidelines and under the observation and testing of the project geotechnical engineer and/or City. The recommended pavement sections are meant as minimums If thinner or highly variable pavement sections are constructed, increased maintenance and repair may be needed Positive site drainage shall be maintained at all times Water shall not be allowed to pond or seep into the ground If planters or landscaping are adjacent to paved areas, measures shall be taken to minimize the potential for water to enter the pavement section, such as thickened edges, closed planters, etc If the ADT (average daily traffic) or ADTT (average daily truck traffic) increases beyond that intended, as reflected by the traffic index(s) used for design, increased maintenance and repair could be required for the pavement section PAVEMENT GRADING RECOMMENDATIONS General All section changes shall be properly transitioned If adverse conditions are encountered during the preparation of subgrade materials, special construction methods may need to be employed A GSI representative shall be present for the preparation of subgrade, base rock, and asphalt concrete 1 Hallmark Communities W.0. 3975 E SC Traditions Corte Tradition July. 26 2004 File e \wp9\3900\3975e pdr Page 2 GeoSoils, Inc. t.. Subcirade Within street and parking areas, all surficial deposits of loose soil material shall be removed and recompacted as recommended After the loose soils are removed, the bottom is to be scarified to a depth of approximately 12 inches, moisture conditioned as necessary and compacted to 95 percent of the maximum laboratory density, as determined byASTM Test Designation D-1 557 Deleterious material, excessively wet or dry pockets, concentrated zones of oversized rock fragments, and any other unsuitable materials encountered during grading shall be removed The compacted fill material shall then be brought to the elevation of the proposed subgrade for the pavement The subgrade shall be proof-rolled in order to ensure a uniform firm and unyielding surface All grading and fill placement shall be observed by the project soil engineer and/or his representative Base Rock Compaction tests are required for the recommended base section Minimum relative compaction required will be 95 percent of the laboratory maximum density as determined byASTM Test Designation D-1557 Base aggregate shall be in accordance to the "Standard Specifications for Public Works Construction" (Greenbook) 1997 edition or standard Caltrans Class .2 base rock (minimum R-value=78) Paving Prime coat may be omitted if all of the following conditions are met 1 The asphalt pavement layer is placed within two weeks of completion of base and/or subbase course 2 Traffic is not routed over completed base before paving 3 Construction is completed during the dry season of May through October 4 The base is kept free of debris prior to placement of asphaltic concrete If construction is performed during the wet season of November through April, prime coat may be omitted if ho rain occurs between completion of base course and paving and the • time between completion of base and paving is reduced to three days, provided the base is free of loose soil or debris Where prime coat has been omitted and rain occurs, traffic is routed over base course, or paving is delayed, measures shall be taken to restore base course, and subgrade to conditions that will meet specifications as directed by the soil engineer. •• 1 • Hallmark Communities •• • S • •' •,: •:. •• •• W.O. 3975-E-SC • S Traditions, Corte Tradition July 26, 2004 File e \wp9\3900\3975e pdr. Page 3 Inc. GeoSoils,