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Home My WebLink About3079; POINSETTIA LN BRIDGE CONSTRUCTION; RECOMMENDED PAVEMENT SECTIONS; 1985-01-23Based on the above assumptions and the results 3467 Kurtz Street San Diego, California 92110-4479 (619) 224-2911 w 71~ Woodwarc*.-ClydeC'onsultants January 23, 1985 Project No. 54167J-#CO1 Mr. Cecil Smith c/o Mr. Mike Wasmann 2455 Garfield Street Carlsbad, California 92008 RECOMMENDED PAVEMENT SECTION' POINSETTA LANE CARLSBAD TRACT NO~--81-5 CARLSBAD, CALIFORghk--~ Gentlemen: In accordance with your request, we are presenting pavement section recommendations for Poinsetta Lane of the subject development. For this letter, we have reviewed our files 'for the Carlsbad Tract No. 81-5 project. A geotechnical investigation report, dated August 31, 1981 was prepared by Medall, Aragon, Worswick and Associates, Inc. for the subject property. Our records indicated that Tract No. 81-5 was graded between April 19 and August 29, 1984 under the observation of personnel from our firm. The results of our observations and testing were presented in a final grading report, dated December 13, 1984. We recommend that the top 12 inches of the subgrade in both cut and fill areas be compacted to at least 95 percent of the maximum laboratory dry density in accordance with ASTM D1557-78. We have obtained a representative sample of the existing subgrade soils from Poinsetts Lane. . Results of subgrade strength (R-value) test. C~performed-by- Testing Engineers - San Diego on the sample indicated an R v-aIue-of-7-'8-.'j It isi7our experience that these-s - oils can have R-values as low as about 50; we have used an ~R-value of 5-01 in our analysis. The R-value test.results, as submitted to us ITy--Testing Engineers - San Diego, are attached. Based on the information provided by Mr. Carlsbad Engineering Department, we have (!Lajor: and have used Ahe required Fa-v-eused-the CalTrans method of pavement Clyde Wickham-of_the City of designed, Poinsetta Lane - s a traffic inje6-(-T-1-)-of-A.5J. !F2.11) desien. - We of our calculations, we ,ane-consistEo inch:e]n _~f -~5 Thiq ate-base-material. This JV mal maintenance. Consulting Engineers, Geologists and Environmental Scientists AffA- Offices in Other Principal Cities qW Mr. Cecil Smith Wofiward-Clyde Consultants Project No. 54167J-FC01 January 23, 1985 Page 2 Class! 11 aggregate base should conform to the State of California "Standard Specifications" (1984), Section 26-1.02B. Asphalt concrete should conform to the State of California "Standard Specifications" (1984), Section 39-2.01 for the asphalt and Section 39-2.02 (Type B) for the aggregate. We recommend that a mix design be made for asphalt concrete by an engineering company specializing in this type of work, and that the pavement operations be inspected by a qualified testing laboratory. We recommend that adequate surface drainage be provided to reduce ponding and infiltration of water into the subgrade materials. We suggest that paved areas have a minimum gradient of 1 percent. As much as possible, planter areas next to pavements should be avoided; otherwise, subdrains should be used to drain the planters to appropriate outlets. It is important to provide adequate drainage to reduce ponding and possible future distress of the pavement section. If you have any questions, please give us a call. Very truly yours, WOODWARD-CLYDE CONSULTANTS h-4. -4xoj~ Joseph G. Kocherhans R.E. 23060 JGK/JNC/ks Attachment: R-value test results (2) Mr. Cecil Smith (2) City of Carlsbad Engineering Department PENETRATION STANDARD INCHES P.S.I. P. S. 1. 0.1 000 0.2 :500 0.3 1900 0.4 2300 0.5 2600 MOISTURE AFTER SOAKING ExPANSION ........... %OF STANDARD FORM 6 JP Testing Engineers—San Diego 3467 Kurtz St, P.O. Box 80985, San Diego, CA 92138 (619) 225-9641 1 2948 Industry Street, Suite B, Oceanside, CA 92054 (619) 758-3730 LABORATORY NUMBER ~DRS -~ 7 0 REPORT OF SOIL TESTS DATE January 24. 1985 JOB DATA: Job No. 1285 PROJECT: Carlsbad Tract 81*5 #54167J-FC01 CLIENT: Woodward/Clyde Consultants 3467 Kurtz Street San Diego, CA 92110 R-VALUE DATA SAMPLE DATA: Material submitted to the laboratory on 1/15/85 identified as S/N R-8, Poin- settia Lane, station 22+65. (Brown clayey sand.) BEARING VALUE (CALIFORNIA HIGHWAY METHOD) COMPACTED AND SOAKED FOUR DAYS A B C D COMPACTOR PRESS - PS.I. 350 350 350 MOIST @ COMPACTION - % 9.5 9.9 10.3 DENSITY - #/Cu. FT. 125.8 124.5 124.9 R-VALUE - STABILOMETER 80 73 68 ExUD. PRESSURE - P.S.I. 330 2h 170 STAB. THICK - FEET 0.29 0.39 0.46 ExPAN. PRESS. THICK-FEET 0.13 0 0 T. 1. (ASSUMED) Z W 0 :) _j ay STAB. @ 300 PS.I. ExUD. = 78 6 :* W By ExPANSION PRESSURE a C~ AT EouILIBRIUM 78 SAND EouIVALENT 20 COMPACTION TEST: METHOD — CALIFORNIA BEARING OPTIMUM MOISTURE... 1 ..................... % OPTIMUM DRY DENSITY, LBS./CU. Fr ............... PLASTIC CHARACTERISTICS: LIQUID LIMIT PLASTIC LIMIT PLASTICITY INDEX REPORTED To: 1) Woodward/Clyde Consultants TESTING ENGINEERS - SAN DIEGO REVIEWED BY WJD:je William 4/DeB y, R.C.E. #34545