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December 21, 2022 <br /> Job No. 4031.101 <br /> Page 11 <br /> <br />BERLOGAR STEVENS & ASSOCIATES <br />7.12.2. SUBGRADE AND AGGREGATE BASE <br /> <br />Prior to subgrade preparation, utility trench backfill should be properly placed and compacted. <br />Subgrade soils for asphalt concrete pavement should be rolled to at least 95 percent relative <br />compaction to provide a smooth, unyielding surface. Subgrade soils should be maintained in a <br />moist and compacted condition until covered with the complete pavement section. <br /> <br />Class 2 Aggregate Base should conform to the requirements in Section 26, Caltrans Standard <br />Specifications. The aggregate base should be placed in thin lifts in a manner to prevent <br />segregation, uniformly moisture conditioned, and compacted to at least 95 percent relative <br />compaction to provide a smooth, unyielding surface. <br /> <br />7.12.3. PAVEMENT EDGE DRAINS <br /> <br />Pavement edge drains should be installed on the downhill side of cross-sloped and along both sides <br />of crowned public streets. Recommendations for pavement edge drain locations for private streets <br />should be provided after reviewing the project improvement plans. <br /> <br /> CORROSION TESTING <br /> <br />Corrosivity analysis was performed by CERCO Analytical, Inc. of on samples of the near-surface <br />soil. As reported by CERCO Analytical, one sample was determined to be “moderately corrosive” <br />another sample was determined to be “corrosive based on resistivity test results. CERCO <br />Analytical’ s report (see Appendix E) included the following recommendation: “All buried iron, <br />steel, cast iron, ductile iron, galvanized steel and dielectric coated steel or iron should be properly <br />protected against corrosion depending upon the critical nature of the structure. All buried metallic <br />pressure piping such as ductile iron firewater pipelines should be protected against corrosion.” <br />Please refer to the CERCO Analytical report included in Appendix E for more information <br />regarding their test results and brief evaluation. <br /> <br /> DETENTION BASIN <br /> <br />A detention basin is panned along the Eastern Margin of the site. The bottom of the basin will be <br />at Elevation 314 feet with Top of Bank at Elevation 320 feet. Side slopes are planned at 3H:1V. <br />There is an existing Sound Wall along the property line. The eastern cut slope for the Detention <br />Basin should be set back a minimum of 10 feet from the soundwall. <br /> <br />8. ADDITIONAL GEOTECHNICAL ENGINEERING SERVICES <br /> <br />Prior to construction, our firm should be provided the opportunity to review the plans and <br />specifications to determine if the recommendations of this report have been implemented in those <br />documents. We would appreciate the opportunity to meet with the contractors prior to the start of <br />site grading, underground utility installation and pavement construction to discuss the procedures <br />and methods of construction. This can facilitate the performance of the construction operation and <br />minimize possible misunderstanding and construction delays.