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HomeMy WebLinkAboutCT 00-06; BRESSI RANCH; RESULTS OF LABORATORY TESTS ON IMPORT CLASS 2 AGGREGATE BASE SAMPLE; 2004-04-20cqoo— ciç Leighton and Associates, Inc. A LEIGHTON GROUP COMPANY April 20, 2004 Project No. 971009-013 To: Lennar Communities 1525 Faraday Avenue, Suite 300 Carlsbad, California 92008 Attention: Ms. Kristine Zortman Subject: Results of Laboratory Tests on Import Class 2 Aggregate Base Sample for the El Camino Real Widening Project, Bressi Ranch, Carlsbad, California References: Caltrans, 1992, Standard Specifications, July 1992 Carlsbad, City of, 1996, Standards for Design and Construction of Public Works Improvements in the City of Carlsbad, California, Project No. 05332-12-01, dated April 20, 1993, revised December 10, 1996 In accordance with the requirements of the City of Carlsbad, we have performed laboratory tests on representative samples of the import Class 2 Aggregate Base (AB) material placed on April 16, 2004 as part of the pavement section for the El Camino Real Widening Project adjacent to Bressi Ranch located in Carlsbad, California. Three representative samples of the Class 2 AB were sampled and transported to our laboratory. Laboratory tests performed on the representative samples included sand equivalent (in accordance with ASTM Test Method D2419) and sieve analysis (in accordance with ASTM Test Method C136). The results of the laboratory tests are presented on Tables 1 through 3. Based on the City of Carlsbad requirements and the Caltrans specifications (Section 26-1.02A) as indicated on Table 1, the representative Class 2 aggregate base samples met the city requirements. 3934 Murphy Canyon Road, Suite 8205 • San Diego, CA 92123-4425 858.292.8030 • Fax 858.292.0771 • www.leightongeo.com 971009-013 Table 1 Laboratory Test Results of Import Class 2 Aggregate Base Material El Camino Real Station No. 302+00 Sieve Analysis (in accordance with ASTM Test Method C136) Operating Range Required Sieve Size Percentage Passing* Sample Result In Conformance? 1 inch 100 100 Yes 3/4 inch 90-100 97 Yes No. 4 3 5-60 54 Yes No. 30 10-30 21 Yes No. 200 2-9 5 Yes Sand Equivalent (in accordance with ASTM Test Method D2419) Required Minimum* Sample Result In Conformance? 25 68 Yes *per Caltrans Standard Specifications Section 26 and City of Carlsbad Standard Special Provisions for Construction. Table 2 Laboratory Test Results of Import Class 2 Aggregate Base Material El Camino Real Station No. 308+00 Sieve Analysis (in accordance with ASTM Test Method C136) Sieve Size Operating Range Required Percentage Passing* Sample Result In Conformance? 1 inch 100 100 Yes 3/4 inch 90-100 93 Yes No. 4 35-60 57 Yes No. 30 10-30 24 Yes No. 200 2-9 7 Yes Sand Equivalent (in accordance with ASTM Test Method D2419) Required Minimum* Sample Result In Conformance? 25 62 Yes *per Caltrans Standard Specifications Section 26 and City of Carlsbad Standard Special Provisions for Construction. -2- Leighton 971009-013 Table 3 Laboratory Test Results of Import Class 2 Aggregate Base Material El Camino Real Station No. 312+00 Sieve Analysis (in accordance with ASTM Test Method C136) Operating Range Required Sieve Size Percentage Passing* Sample Result In Conformance? 1 inch 100 100 Yes /4inch 90-100 95 Yes No. 4 35-60 50 Yes ------- No. 30 10-30 19 Yes No. 200 1 2-9 5 Yes Sand Equivalent (in accordance with ASTM Test Method D2419) Required Minimum* Sample Result In Conformance? 25 65 Yes *per Caltrans Standard Specifications Section 26 and City of Carlsbad Standard Special Provisions for Construction. If you have any questions regarding our letter, please contact this office. We appreciate this opportunity to be of service. Respectfully submitted, LEIGHTON AND ASSOCIATES, INC. 10 K Randall K. Wagner, G 1612 Senior Associate Distribution: (2) Addressee (1) Lennar Communities, Attention: Mr. Jim Urbina V (2) City of Carlsbad, Public Works Department, Attention: Mr. Casey Arndt (1) J. T. Kruer, Attention: Mr. Steve Lobaugh (1) Hazard Construction Company, Attention: Mr. Lino Cruz -3- Leighton