The URL can be used to link to this page

Home My WebLink AboutCT 03-02; CARLSBAD RANCH PA 5; PAVEMENT ANALYSIS FOR LOT 12; 2008-09-04crc.-02 Geotechnical Engineering Construction Inspection Materials Testing Environmental September 4, 2008 San Diego Imperial County 7313 Carroll Road Suite 9 San Diego, CA 92121 Tel: 858.537.3999 Fax: 858.537.3990 www.mtglinc.com Mr. Bruce Zelenka Grand Pacific Carlsbad, L.P. Project No. 1916-CO 1 5900 Pasteur Court, Suite 200 Log No. 08-1400 Carlsbad, CA 92008 Subject: Pavement Analysis for Lot 12 Carlsbad Ranch Carlsbad, CA Dear Mr. Zelenka: In accordance with your request, we are providing this pavement analysis for the Carlsbad Ranch Lot 12. A total of three soil samples were obtained at different locations on the rough graded subgrade planned to receive pavement. Resistance R-value testing was performed in general accordance with Caltrans Test Method 301. The R-value results are summarized below. Sample No. Location. R-Value - 1 East End Area 70 L 2 Middle Area 55 3 West End Area 53 Our engineering analysis for the asphalt concrete structural section was based upon the standard design procedures for pavement as outlined in Caltrans Highway Design Manual. Our analysis incorporates the Traffic Index provided in the project geotechnical report of Leighton and Associates, Inc., dated April 11, 2005, a Traffic Index of 4.5 and 5.0 for automobile parking and driveway, respectively. The minimum R-value of 53 was utilized in the analysis. With the above parameters, the pavement Section of 3 inches AC and 4 inches AB shown on the approved plans is sufficiently adequate up to a Traffic Index of 6.0. However, based upon the City of Carlsbad, Standard No. GS-17, the corresponding minimum pavement section shall be 4 inches AC and 4 inches AB for a Traffic Index of 4.5 and 5.0. Office Locations. Orange County Corporate Branch: 2992 E. La Palma Avenue Suite A Anaheim, CA 92806 Tel: 714.632.2999 Fax: 714.632.2974 Inland Empire 14467 Meridian Parkway Building 2A Riverside, CA 92518 Tel: 951.653.4999 Fax: 951.653.4666 DC/LA/Inland Empire Dispatch 800.491.2990 San Diego Dispatch 888.844.5060 Fl Carlsbad Ranch Lot 12 Project No. 1916-CO1 Carlsbad, CA Log No., 8-1400 Construction Considerations The upper 12 inches of subgrade shall be compacted to a minimum of 95 percent relative compaction based on ASTM D1557. Base material shall conform to the requirements of Section 200-2 of the Standard Specifications for Public Works Construction (SSPWC). The relative compaction of the base material shall not be less than 95 percent per Test Method ASTM D1557. Asphalt concrete shall be dense, hot-laid, hot mix asphalt plant mixes with a history of satisfactory performance in geographical area where project is located and approved by authorities having jurisdiction. Hot-mix asphalt paving materials, workmanship and other requirements shall be in accordance with the state standard specifications or SSPWC. Geotechnical Observation/Testing The geotechnical consultant shall perform geotechnical observation and testing to ascertain that conditions corresponds to the findings and conclusions and that construction conform generally to the recommendations presented herein. If you have any questions regarding this letter, please do not hesitate to contact us immediately. Respectfully Submitted, MTGL, Inc. ' .57217 M EiP12l31(O1J Eduardo C. Dizon, PE Project Engineer CIVIV cc: Davis Adams Attachment: R-value Lab Test Reports Computer Output Pavement Analysis ACP Thickness S - File No.: 1916-CO1 Cllent:ICarlsbad Ranch Lot 12 Base By:ED -- Date 9/4/2008 TI G1 Types G Types 0 2.50 1 1.0 "Aggregate Subbase ________ ______ 5 2.50 2 1.1 'Untreated A. B. 6 2.32 - 3 12 '.Lime Treated Base Base Type: 12 7 2.14 4 1 1.7 Class A CTB Base Type: "Untreated A. B 8 1 2.01 5 1.5 Class B CTB -- BaseG1:1.1. . 9 1.89 6 1.2 ClassCCTB - _____ -..........................I ___.........._ ___ 10 1.79 7 1.0 Other Base R-Value: 78 11 1.71 ______ _____ 12 1.64 ______ Full A.C. Sect F.S.: 0.2 0.1 13 1.57 14 1.52 ______ ______ ______ ______ Expansive Swell Use Swell Equilibrium_______ ____ Minimum Use Actual Minimum Use Reduced Full Sect Full Sect Reduced Subgrader - TI R-Value GET, (feet) GE, (feet) GE (feet) G1 T (feet) (Inches) GEac GEb Tb I Tb (feet) (feet) (feet) (Inches) I Subgradel Tac Tac R-Value J feet) (inches) Subgrade R-Value 4.5 53.0 0.47 0.68 1 0.52 2.50 0.21 3.0 0.63 0.05 1 0.05 1.0 49.4 0.31 4.0 49.4 5.0 53.0 6.0 53.0 0.55 0.60 0.75 1 0.90 0.55 -. 0.62 2.50 2.32 0.22T3.0 0.27 3.0 0.63 0.13 0.12 1.5 0.58 0.32 . 0.29. 4.0 44.5 0.34 4.54 64.6 043 5.5 55.0 7.0 53.0 1 0.70 1.05 1 0.69 1 2.14 0.32 4.0 0.71 0.34 1 0.31 4.0 63.9 0.54 6.5 55.6 #DIV/0' #DIV/0! Page 1 R-VALUE TEST REPORT, 100-- 80 60— > 40- 20 - -- 0 U_l_L .L.LU LLLL IJJJ. .LLLL .LL.0 LLLL LLLL JJJJ. .LLLJ. LJ...LL L.LL.L .LLLL .LLU 800 700 600 500 400 300 200 100 Exudation Pressure - psi Resistance R-Value and Expansion Pressure - Cal Test 301 Compact. Expansion Horizontal Sample Exud. R Density Moist. R No. Pressure Pressure Press. psi Height Pressure Value pcf / Value - psi psi @160 psi i n. psi Corr. 1 350 116.9 8.5 0.36 34 2.61 716 70 72 2 350 114.1 9.3 0.30 37 1 2.64 1 318 67 70 3 350 109.2 11.9 0.00 40 2.66 215 65 69 Test Results Material Description R-value at 300 psi exudation pressure = 70 SILTY SAND (SM), light brown Project No.: 1916-COI Tested by: JS ProJect:CARLSBAD RANCH - LOT 12 Checked by: JH Location: EAST END AREA Remarks: Sample Number: I Lab #848 Date: 9/4/2008 A-VALUE TEST REPORT MTGL, Inc. Figure R-VALUE TEST REPORT .100 - -- 80 60 - 40 HIIIIIIIIIEII cc 20 - 0 .LLLL i_I_U LL LL 1_LU. U_I_I. .LJ_LL LU..L LI_I_I. .1_I_I_I. i_I_LI 800 700 600 500 400 300 200 100 Exudation Pressure - psi Resistance R-Value and Expansion Pressure - Cal Test 301 Compact. Expansion Horizontal Sample Exud. R Density Moist. R No. Pressure Pressure Press. psi Height Pressure Value PC f % Value - . psi psi @ 160 psi In. psi Corr. 350 113,1 15.1 0.30 44 2.53 438 62 62 2 350 110.3 16.0 0.33 58 2.55 239 51 51 3 350 114.2 14.3 0.27 38 2.51 668 67 67 Test Results Material Description R-value at 300 psi exudation pressure = 55 SILTY SAND (SM), light brown Project No.: 1916-00I Tested by: JS Project:CARLSBAD RANCH - LOT 12 . Checked by: JR Location: MIDDLE AREA Remarks: Sample Number: 2 Lab #849 Date: 9/4/2008 R-VALUE TEST REPORT MTGL, Inc. Figure R-VALUE TEST REPORT 100-- 80— - 60 CD — 40 20 -- iLL! LU_I LLLL J_UJ. LIJJ. LLL.L LI_LI LI_U .LLLI .LLU .U_LL UJJ. JJJJ. LI_Li 800 700 600 500 400 300 200 100 Exudation Pressure - psi Resistance R-Value and Expansion Pressure - Cal Test 301 No. Compact. Pressure psi Density pcf Moist. st. % Expansion Pressure psi Horizontal Press. psi @160 psi Sample Height in. Exud. Pressure psi R Value R Value Corr. 350 119.4 10.0 0.00 30 2.56 676 74 75 2 1 350 1 115.2 1 12.5 0.00 1 60 2.57 1 279, 1 49 1 51 3 350 118.2 11.7 0.00 38 1 2.55 1 438 L 67 J 67 Test Results Material Description Rvalue at 300 psi exudation pressure = 53 SILTY SAND (SM), dark brown Project No.: 1916-COI Project:CARLSBAD RANCH- LOT 12 Location: WEST END AREA Sample Number: 3 Date: 9/4/2008 Lab #850 Tested by: JS Checked by: JH Remarks: Figure R-VALUE TEST REPORT MTGL, Inc.