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HomeMy WebLinkAboutCT 00-06; BRESSI RANCH; RESULTS OF LABORATORY TESTS ON IMPORT CLASS 2 AGGREGATE BASE SAMPLES; 2004-04-30it Leighton and Associates, Inc. A LEIGHTON GROUP COMPANY April 30, 2004 Project No. 971009-017 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 Samples Placed on April 22, 2004 for the Bressi Ranch Backbone Streets, a Portion of Town Garden Road, 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 22, 2004 as part of the pavement section for a portion of Town Garden Road within Bressi Ranch located in Carlsbad, California. Four 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 the tables, the representative Class 2 aggregate base samples generally met the city requirements. However, the samples on Town Garden Road at Station No. 19+50 and 17+00 were slightly out of specification (i.e. all three were 1-percent over the maximum value) with respect to the percent passing the No. 4 sieve for the sample at Station No. 19+50 and the No. 30 and No. 200 sieves for the sample at Station No. 17+00. 3934 Murphy Canyon Road, Suite B205 • San Diego, CA 92123-4425 858.292.8030 • Fax 858.292.0771 • www.leightongeo.com 971009-017 Table 1 Laboratory Test Results of Import Class 2 Aggregate Base Material Town Garden Road Station No. 24+75 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 96 Yes No. 4 35-60 44 Yes No 30 10-30 20 Yes No. 200 2-9 7 Yes Sand Equivalent (in accordance with ASTM Test Method D2419) Required Minimum* Sample Result In Conformance? 25 51 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 Town Garden Road Station No. 19+50 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 35-60 61 No No. 30 10-30 30 Yes No. 200 2-9 9 Yes Sand Equivalent (in accordance with ASTM Test Method D2419) Required Minimum* Sample Result In Conformance? 25 46 Yes *per Caltrans Standard Specifications Section 26 and City of Carlsbad Standard Special Provisions for Construction. -2- Leighton 971009-017 Table 3 Laboratory Test Results of Import Class 2 Aggregate Base Material Town Garden Road Station No. 5+50 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 94 Yes No. 4 3 5-60 40 Yes No. 30 10-30 19 Yes No. 200 2-9 7 1 Yes Sand Equivalent (in accordance with ASTM Test Method D2419) Required Minimum* Sample Result In Conformance? 25 49 Yes *per Caltrans Standard Specifications Section 26 and City of Carlsbad Standard Special Provisions for Construction. Table 4 Laboratory Test Results of Import Class 2 Aggregate Base Material Town Garden Road Station No. 17+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 % inch 90-100 98 Yes No. 4 3 5-60 60 Yes N o.30 10-30 31 No No. 200 2-9 10 No Sand Equivalent (in accordance with ASTM Test Method D2419) Required Minimum* Sample Result In Conformance? 25 33 Yes *per Caltrans Standard Specifications Section 26 and City of Carlsbad Standard Special Provisions for Construction. -3- Leighton 971009-017 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. 40 Randall Ck'r--- Randall K. Wagner, CEG Senior Associate Distribution: (2) Addressee Lennar Communities, Attention: Mr. Jim Urbina City of Carlsbad, Public Works Department, Attention: Mr. Casey Arndt (1) J. T. Kruer, Attention: Mr. Chuck Knight -4- Leighton