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Mr. Phong Du, P.E. - - August 25, 1997 <br />Page 2 <br /> <br /> · 1968 Linear Feet of New 12-inch PVC Sanitary Sewer Main to Replace <br /> Existing 6-, 8- and 10-inch VCP Sanitary Sewer Main <br /> <br /> · 56 Linear Feet of New 12-inch Sanitary Sewer Main <br /> <br />It appears that the trench depths will range from 3 to 11 feet below centerline of the <br />street. Based upon previous geologic mapping in this area, we anticipate that most, <br />if not all of the excavations will occur in unconsolidated alluvial sediment. The west <br />end of the Jefferson Avenue site may encounter bedrock. We understand that all <br />trench segments to be tested will be properly shored for stability and safe entry for <br />testing, pursuant to the specifications of the City Engineer. <br /> <br />Purpose and Scope of Services <br /> <br />The purpose of the requested geotechnical services is to confirm that the earth <br />materials used for the project are in accordance with the specifications in the <br />Contract Document for pipe bedding and trench backfill, and that they conform to the <br />minimum compaction requirements in the same (Technical Specifications, Section <br />02202 pertaining to Trenching and Backfill). <br /> <br />The scope of services will include: <br /> <br />1. Perform laboratory materials acceptance standard tests based upon American <br /> Society for Testing and Materials (ASTM) and Caltrans (Calif.) test methods. <br /> Test that may be required include: <br /> <br /> · Gradation (ASTM D-422 or Calif. 202) <br /> · Durability Index (Calif. 229) <br /> · R-Value (Calif. 301) <br /> · Sand Equivalent (Calif. 217) <br /> · Plasticity Index (ASTM D-4318) <br /> · Modified Proctor Compaction Test (ASTM D-1557) <br /> <br />2. Perform field nuclear density testing to confirm minimum compaction <br /> requirements per the Technical Specifications; <br /> <br />3. Documentation of geotechnical site observations and field nuclear density tests. <br /> If desired, we will submit Daily Reports to the City Engineer on a weekly basis <br /> describing the activities of the Contractor at the time the geotechnical <br /> observations and testing occur, and will include the locations of all field nuclear <br /> density tests. <br /> <br /> Earth Investigations Consultants <br /> <br /> <br />