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Home My WebLink AboutCT 00-06; BRESSI RANCH; RESULTS OF LABORATORY TESTS OF THE BASE COURSE ASPHALT CONCRETE; 2004-05-114, c'roo-oç, Leighton and Associates, Inc. A LEIGHTON GROUP COMPANY May 11, 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 of the Base Course Asphalt Concrete Placed on April 28 and 29, 2004 for a Portion of Town Garden and Alicante Roads, Bressi Ranch, Carlsbad, California References: 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 "Green Book" Standard Specifications for Public Works Construction, 2000 Edition with 2001 Supplement In accordance with the requirements of the City of Carlsbad, we have performed laboratory tests of the Base Course Asphalt Concrete (AC) placed on April 28 and 29,, 2004 within the Bressi Ranch project located in Carlsbad, California. The AC was placed on a portion of Town Garden and Alicante Roads. Three representative samples of the "Greenbook" Type B-AR-4000 AC were obtained each day (for a total of six) samples and transported to our laboratory. Laboratory tests performed on the representative samples included gradation and oil content (in accordance with ASTM D2172 and California Test Nos. 202) and laboratory maximum density tests (by the Hveem Method - California Test Nos. 304 and 308). In addition, a stabilometer value test (in accordance with California Test No 304 and 366) was performed on Sample No. 6. The results of the laboratory tests are presented on Tables 1 through 6. Based on the City of Carlsbad requirements and the "Greenbook" specifications presented on Table 203-6.3.2(A), the representative AC samples generally met the city requirements as indicated on the tables. However, Sample No. 6 (at Alicante Road Station No. 111+50) was slightly out of specification with respect to the percent passing the '/2-inch, No. 4 and No. 8 sieves (i.e. the percent passing for each of the sieves was 1- to 5-percent over the maximum value). In 3934 Murphy Canyon Road, Suite B205 • San Diego, CA 92123-4425 858.292.8030 • Fax 858.292.0771 • www.leightongeo.com 971009-017 accordance with the City of Carlsbad requirements, a stabilometer value test was performed on the sample. The stabilometer value test results indicated the sample met the minimum stabilometer value of 35. In addition to the laboratory testing, field density testing of the AC (utilizing the Hveem laboratory maximum density test results) was performed during the street pavement section grading operations. The results of the field density testing performed during the placement and compaction of the AC indicate the AC was compacted to a minimum relative compaction of at least 95 percent (based on the Hveem Method - California Test No. 308). The test results will be presented in the final as-grade report of post grading operations, which is currently being prepared. 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. A21' fSWMr- Randall K. Wagner, (G 1612 Senior Associate J 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. Chuck Knight -2- Leighton 971009-017 Table 1 Laboratory Test Results of Asphalt Concrete Sample No 1 - Town Garden Road Station No. 5+50 (April 28, 2004) Gradation: Sieve Size Percent Passing Sieves* Sample Result In Conformance? 1 inch 100 100 Yes 3/4 inch 87-100 97 Yes 1/2 inch 70-87 79 Yes 3/8 inch 55-76 63 Yes N. 4 35-52 45 Yes No. 8 22-40 32 Yes No. 30 8-24 18 Yes No. 50 5-18 12 Yes No. 200 0-7 5.4 Yes Oil Content: Required Minimum* Sample Result In Conformance? 4.5 to 5.8 percent 4.5 Yes Hveem Density: 1 144.8 *per "Greenbook" Standard Specifications Table 203-6.3.2(A) and the City of Carlsbad Standard Special Provisions for Construction. -3- Leighton 971009-017 Table 2 Laboratory Test Results of Asphalt Concrete Sample No 2 - Town Garden Road Station No. 3+00 (April 28, 2004) Gradation: Sieve Size Percent Passing Sieves* Sample Result In Conformance? 1 inch 100 100 Yes ~ inch 87-100 100 Yes 1/2 inch 70-87 83 Yes 3/8 inch 55-76 68 Yes No. 4 35-52 49 Yes No. 8 22-40 36 Yes No. 30 8-24 20 Yes No 5-18 14 Yes No. 200 0-7 5.9 Yes Oil Content: Required Minimum* Sample Result In Conformance? 4.5 to 5.8 percent 4.8 Yes Hveem Density: 144.4 *per "Greenbook" Standard Specifications Table 203-6.3.2(A) and the City of Carlsbad Standard Special Provisions for Construction. 4 -4- Leighton 971009-017 Table 3 Laboratory Test Results of Asphalt Concrete Sample No 3 - Town Garden Road Station No. 32+00 (April 28, 2004) Gradation: Sieve Size Percent Passing Sieves* Sample Result In Conformance? 1 inch 100 100 Yes 3/4 inch 87-100 97 Yes V2 inch 70-87 81 Yes 3/8 inch 55-76 65 Yes No. 4 35-52 47 Yes No. 8 22-40 33 Yes No. 30 8-24 17 Yes No. 50 5-8 12 Yes No. 200 0-7 5.4 Yes Oil Content: Required Minimum* Sample Result n.Conformance? 4.5 to 5.8 percent 4.9 Yes Hveem Density: 1 145.3 *per "Greenbook" Standard Specifications Table 203-6.3.2(A) and the City of Carlsbad Standard Special Provisions for Construction. 4 -5- Leighton 971009-017 Table 4 Laboratory Test Results of Asphalt Concrete Sample No 4 - Alicante Road Station No. 105+50 (April 29, 2004) Gradation: Sieve Size Percent Passing Sieves* Sample Result In Conformance? I inch 100 100 Yes 3/4 inch 87-100 98 Yes V2 inch 70-87 83 Yes 3/8 inch 55-76 65 Yes No. 4 35-52 47 Yes No. 8 22-40 33 Yes No. 30 8-24 17 Yes No 50 5-18 12 Yes No. 200 0-7 5.4 1 Yes Oil Content: Required Minimum* Sample Result In Conformance? 4.5 to 5.8 percent 4.9 Yes Hveem Density: 144.7 *per "Greenbook" Standard Specifications Table 203-6.3.2(A) and the City of Carlsbad Standard Special Provisions for Construction. qf IM Leighton 971009-017 Table 5 Laboratory Test Results of Asphalt Concrete Sample No 5 - Alicante Road Station No. 111+75 (April 29, 2004) Gradation: Sieve Size Percent Passing Sieves* Sample Result In Conformance? 1 inch 100 100 Yes 3/4 inch 87-100 100 Yes V2 inch 70-87 82 Yes 3/8 inch 55-76 65 Yes No. 4 35-52 47 Yes No. 8 22-40 34 Yes No. 30 8-24 19 Yes No. 50 5-18 13 Yes No. 200 0-7 5.7 Yes Oil Content: Required Minimum* Sample Result In Conformance? 4.5 to 5.8 percent 4.7 Yes Hveem Density: 1 144.8 *per "Greenbook" Standard Specifications Table 203-6.3.2(A) and the City of Carlsbad Standard Special Provisions for Construction. 4 -7- Leighton 971009-017 Table 6 Laboratory Test Results of Asphalt Concrete Sample No 6 - Alicante Road Station No. 111+50 (April 29, 2004) Gradation: Sieve Size Percent Passing Sieves* Sample Result In Conformance? 1 inch 100 100 Yes 3/4 inch 87-100 98 Yes V2 inch 70-87 88 No 3/8 inch 55-76 74 Yes No. 35-52 57 No No. 8 22-40 43 No No. 30 8-24 23 Yes No. 50; 5-18 15 Yes No. 200 0-7 6.4 1 Yes Oil Content: Required Minimum* Sample Result In Conformance? 4.5t05.8percent 5.3 Yes Stabilometer Value: Required Minimum* Sample Result In Conformance? 35 44 Yes Hveem Density: 1 144.7 *per "Greenbook" Standard Specifications Table 203-6.3.2(A) and the City of Carlsbad Standard Special Provisions for Construction. 4 Leighton