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Home My WebLink About3676; PALOMAR AIRPORT RD AND EL CAMINO REAL TURN LANES; PAVEMENT DESIGN RECOMMENDATIONS; 1999-11-05Leighton and Associates anon AGTGCompany GEOTECHNICAL CONSULTANTS November 5, 1999 Project No. 4990220-001 To: Benyman & Henigar 11590 West Bernardo Court, Suite 100 San Diego, CA 92127-1624 Attention: Mr. Mark Rish Subject: Pavement Design Recommendations, Proposed Shoulder Widening at the Intersection of El Camino Real and Palomar Airport Road, Carlsbad California References: P & D Technologies, 1992, Plans for Signing and Striping of P.A.R. 99+22.38 to 109+00.00, E.C.R 314+75 to 320+91.07, Carlsbad, California, Sheet 89 of 135, Project No. 3341, dated July 6, 1992 In accordance with your request, we have performed limited geotechnical sampling, testing and analysis to develop design pavements sections for the proposed shoulder widening project at the intersection of El Camino Real and Palomar Airport Road in Carlsbad, California. We understand the project will consist of widening approximately 500 lineal feet of the northbound and westbound shoulders of El Camino Real and Palomar Airport Road. To develop design parameters for analysis of pavement sections, a representative from our firm collected samples from two pothole excavations excavated along the proposed shoulder alignments. Each of the collected samples was tested for resistance value (R-Value) in accordance with Cal Test Method 301. The results of our laboratory analysis are presented in Table 1 below. Table 1 Summary of Laboratory Test Results Sample Location [ Sample Description R-Value El Camino Real Brown, silty CLAY with fine gravel 27 STA 318+15 Palomar Airport Road Brown, silty CLAY with fine gravel 29 STA 101+70 3934 Murphy Canyon Road, #B205, San Diego, CA 9213-4425 (619) 292-8030 • FAX (619) 292-0771 0 www.leightongeo.com 990220-001 As requested, design pavement sections were determined using design traffic indexes (T.I.) of 8.5 and 9. The design pavement sections were calculated using the methodology outlined in the Caltrans Highway Design Manual. Minimum thicknesses were determined according to the Standards for Design and Construction of Public Works Improvements in the City of Carlsbad. Pavement sections are provided for various base and subbase combinations. Summaries of the pavement section design calculations utilizing Caltrans design methods are attached. Asphalt Concrete and Crushed Aggregate Base Section The sections provided in Table 2 are for pavements constructed using asphalt concrete (AC) over crushed aggregate base. To allow for specification of a uniform section utilizing a thinner section of crushed aggregate base, calculations were also performed for the condition where the pavement section is underlain by a subbase that possesses an R-Value of at least 50. The design sections are based on the lower of the two subgrade R-Value results. Additional R-Value testing should be performed during grading on representative soils exposed at the subgrade elevation. If the subgrade materials exposed during grading possess a lower R-Value, increased section thickness will be required Traffic AC over Crushed Aggregate Base AC over Crushed Aggregate Base over Subbase Crushed Crushed Index Design Asphalt Aggregate Asphalt Aggregate R =50 (T.1) R-Value Concrete Base Concrete Base Subbase Thickness Thickness Thickness Thickness Thickness (inches) (inches) (inches) (inches) (inches) 8.5 27 5 14 5 7 7 9.0 27 6 13 6 6 8 All aggregate base, subbase, and the upper 12 inches of subgrade should be compacted to a minimum 95 percent relative compaction based on American Standard of Testing and Materials (ASTM) Test Method D1557. Compacted materials should be placed at near optimum moisture content. Crushed aggregate base and Asphalt Concrete should conform to and be placed in accordance with the "Greenbook" Standard Specifications for Public Works Construction (Sections 200, 203, and 400) and the City of Carlsbad requirements. 990220-001 If you have any questions regarding our report, please contact this office. We appreciate this opportunity to be of service. Respectfully submitted, INC. Senior Proj NO. 54033 EXP. Attachments: Asphalt Pavement Section Design Calculations CIV4 Distribution: (2) Addressee A ASPHALT PAVEMENT SECTION DESIGN CALCULATION 990220-001 FOR ASPHALT CONCRETE AND CRUSHED AGGREGATE BASE SECTION El Camino Real Palomar Airport Road DESIGN INPUT STA 318+15 STA 101+70 TRAFFIC INDEX SUBGRADE R-VALUE CRUSHED AGO BASE R-VALUE STRUCTURAL CALCULATIONS REQUIRED GETOTAL AC GRAVEL FACTOR GEAC GEAC+ SF THICKNESSAc DESIGN THICKNESSAC GEDESIGNAC GEBASE BASE GRAVEL FACTOR THICKNESSBASE DESIGN THICKNESSBASE DESIGN SECTIONS AC CRUSHED AGGREGATE BASE 8.5 9 27 27 80 80 1.986 2.102 1.89 1.89 0.544 0.576 0.744 0.776 4.724 4.927 5.0 6.0 0.788 0.945 1.198 1.157 1.1 13.070 1.1 12.626 14.0 13.0 T 14.0 ;.: . ioiç 8.5 9 29 29 80 80 1.931 2.045 1.89 1.89 0.544 0.576 0.744 0.776 4.724 4.927 5.0 6.0 0.788 0.945 1.144 1.100 1.1 1.1 12.477 11.998 13.0 12.0 ASPHALT PAVEMENT SECTION DESIGN CALCULATION 990220-001 FOR ASPHALT CONCRETE, CRUSHED AGGREGATE BASE, AND AGGREGATE SUBBASE SECTION El Camino Real STA 318+15 8.5 9 27 27 50 50 80 80 1.986 2.102 1.89 1.89 0.544 0.576 0.744 0.776 4.724 4.927 5.0 6.0 0.788 0.945 1.360 1.440 0.573 0.495 6.245 5.400 7.0 6.0 0.642 0.550 1.429 1.495 .0.556 0.607 6.677 7.289 7.0 8.0 Palomar Airport Road STA 101+70 8.5 9 29 29 50 50 80 80 1.931 2.045 1.89 1.89 0.544 0.576 0.744 0.776 4.724 4.927 5.0 6.0 0.788 0.945 1.360 1.440 0.573 0.495 1.1 1.1 6.245 5.400 7.0 6.0 0.642 0.550 1.429 1.495 0.502 0.550 6.024 6.598 7.0 7.0 DESIGN INPUT TRAFFIC INDEX SUBGRADE R-VALUE SUBBASE R-VALUE CRUSHED AGO BASE R-VALUE STRUCTURAL CALCULATIONS REQUIRED GETOTAL AC GRAVEL FACTOR GEAC GEAC+ SF THICKNESSAc DESIGN THICKNESSAC GEDESIGNAC REQUIRED GEAc +BASE GEBASE BASE GRAVEL FACTOR THICKNESSBASE DESIGN THICKNESSBASE GEDJGNBAsE BASE GESUBBASE TH ICKNESSSIJBBASE DESIGN THICKNESSSUBBASE DESIGN SECTIONS AC 5 0 in 6'01 CRUSHED AGGREGATE BASE 7 0 ü SUBBASE '7.0 in 80 In 7 0in1 0 ifl;c'