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HomeMy WebLinkAboutCT 02-16; ROBERTSON RANCH; PAVEMENT DESIGN REPORT; 2007-09-18rfo City of Carlsbad Construction Management & Inspection 5950 El Camino Real Carlsbad, CA 92008 . Geotechnical Coastal • Geologic 'Environmental Nay Carlsbad, California 92010 (760) 438-3155 • FAX (760) 931-0915 CITY OF CARLS5741 paimer APROVE WITH ADDITIIONS ,., I September-18, 2007 I /A/O7J APOUNT W 0 5354-E-SC L / BY . - DATE ' ACCOUNT NUMBER: McMil'lin Communities . '• 2750 Womble Road San Diego, California 92106 'Sudes Tax Invelm _Yes APPROVED 3Y No Attention Mr Don Mitchell Subject: Pavement Design Report, Improvement (Widening) of. Colleg& Boulevard (Stations 103 to 118), and Cannon Road (Stations 127+20 to '159), City of Carlsbad, San Diego County California Dear Mr. Mitchell: . In accordance with your request, GeoSoils, Inc.. (GSl), has prepared this revised preliminary design and construction recommendations for asphalt concrete (AC) pavement at the subject site. The scope of services provided in preparation of this report include a - review of the referenced reports' and documents (see the Appendix), an evaluation of the structural pavement section for a given area, and preparation of this report PAVEMENT DESIGN' Pavement section design was performed in accordance with the California Department of Transportation (Caltráns) Highway Design'Manual of Instructions and the City of Carlsbad Standard Drawings (see theAppendix). Pavement sections presented are based on the aforementioned criteria and resistance value (R-value) data (see table), determined from soils, exposed at, or near, final subgrade elevations within the subject areas. R-value testing was performed in accordance with the latest revisions to the Department of Transportation, State of California, Material & Research Test Method No. 301.- -ASPHALT CONCRETE PAVEMENT Structural Section R-values ranging frOm 5 to 68 were determined for subgrade soils onsite and used in pavement design. The recommended pavement sections are presented in the following table: . '.. • • - 4 • .. • - AGGREGATEBASE TRAFFIC SUBGRADE THICKNESS THICKNESS 23 TRAFFIC AREA '. INDEX fl-VALUE (Inches)(1(3) (inches) Cannon Road (so. side) 8.5 12 5.0 1/0 Stations 127+L0 to 130 Cannon Road (so. side) 8.5 25 5.0 Stations 130+00 to 135+22 Cannon Road (so. side) 8.5 5 6.0* 20.0* Stations 135 to 140 Cannon Road (so. side) 8.5 11 6.0* 20.0* Stations 140+22 to 145+ Cannon Road (so. side) 8.5 5 6.0* 20.0* Stations 145 to 150+22 Cannon Road (so. side) 8.5 5 6.0*. 20.0* Stations 150 to 155+22 Cannon Road (so. side) 8.5 8 6.0* 20.0* Stations 155 to 159 Cannon Road (no. side) 8.5 68 5.0 6.0 Stations 128 to 131 +00 Cannon Road (no. side) 8.5 5 6.0* 20.0* Stations 131to 136 Cannon Road (no. side) 8.5 25 5.0 13e Stations 136+L0 to 137 114.0 Cannon Road (no. side) 8.5 6 6.0* 20.0* Stations 137+L0 to 1 42 Cannon Road (no. side) 8.5 7 6.0* 20.0* Stations 142 to 148+22 Cannon Road (no. side) 8.5 8 6.0* 20.0* Stations 148 to 153+220 College Blvd. (So. side) 8.5 23 5.0 Stations 103 to 108 College Blvd. (so. side) 8.5 22 5.0 Stations 1 08 to 11 2 College Blvd. (so. side) 8.5 22 5.0 Stations 112+10 to 115 15,0 College Blvd. (no. side) 8.5 14 5.0 17.0 Stations 106to 111 College Blvd. (no. side) 8.5 5 6.0* 20.0* Stations 111 +15 to 116 City minimum. Denotes Class 2 Aggregate Base R >78, SE >25). New pavement shall match existing where existing pavement exceeds table values. * Exceeds Caltrans requirements. .11 / / I / 5A (3f-G / / / V V bsjdo (:e( 4t-4..4 t Calavera Hills II, LLC Improvements for College/Cannon File:e:\wp9\5300\5354e.pdr GeoSoils, Inc. W.O. 5354-E-SC September 18, 2007 Page 2 All pavement installation, including preparation and compaction of subgrade, compaction of base material, and placement and rolling of asphaltic concrete, shall be done in accordance with the City guidelines, and under the observation and testing of the project geotechnical engineer and/or the City. New pavement shall match existing where existing pavement exceeds table values presented herein. It should be noted that subgrade lime treatment was previously waived by the City for the construction of the existing pavement sections (GSI, 2004a, 2004b, and 2004c). It is therefore anticipated that lime stabilization will not be performed for the current road widening. The recommended pavement sections are meant as minimums. If thinner or highly variable pavement sections are constructed, increased maintenance and repair may be needed. The recommended pavement sections provided above are intended as a minimum guideline. If thinner or highly variable pavement sections are constructed, increased maintenance and repair could be expected. If the ADT (average daily traffic) or ADTT (average daily truck traffic) increases beyond that intended, as reflected by the TI used for design, increased maintenance and repair could be required, for the pavement section. Consideration should be given to the increased potential for distress from overuse of paved street areas by heavy equipment and/or construction related heavy traffic (e.g., concrete trucks, loaded supply trucks, etc.), particularly when the final section is not in place (i.e., topcoat). Best management construction practices should be followed at all times, especially during inclement weather. PAVEMENT GRADING RECOMMENDATIONS r,pnprnl All section changes shall be properly transitioned. .If adverse conditions are encountered during the preparation of subgrade materials, special construction methods may need to be employed. A GSI representative shall be present for the preparation of subgrade, base rock, and asphalt concrete. Subgrade Within street and parking areas, all surficial deposits of loose soil material shall be removed and recompacted as recommended. After the loose soils are removed, the bottom is to be scarified to a depth of at least 12 inches, moisture conditioned as necessary, and compacted to 95 percent of the maximum laboratory density, as determined by ASTM test designation D-1557. - Deleterious material, excessively wet or dry pockets, concentrated zones of oversized rock fragments, and any other unsuitable materials encountered during grading shall be removed. The compacted fill material shall then be brought to the elevation of the proposed subgrade for the pavement. •The subgrade shall be proof-rolled in order to Calavera Hills II, LLC W.O. 5354-E-SC College/Cannon Widening, Carlsbad September 18, 2007 File:e:\wp9\5300\5354e.pdr ,Page 3 GeoSoils, Inc. ensure a uniform firm and unyielding surface. All grading and fill placement shall be observed by the project soil engineer and/or his representative. Base Rock Compaction tests are required for the recommended base section. Minimum relative compaction required will be 95 percent of the laboratory maximum density as determined by ASTM test designation D-1557. Base aggregate shall be in accordance with Section 26 of Caltrans Standard specifications (California Department of Transportation, 2006), for Caltrans Class 2 aggregate base. Paving Prime coat may be omitted if all of the following conditions are met: The asphalt pavement layer is placed within two weeks of completion of base and/or subbase course. Traffic is not routed over completed base before paving. Construction is completed during the dry season of May through October The base is kept free of debris prior to placement of asphaltic concrete. If construction is performed during the wet season of November through April, prime coat may be omitted if no rain occurs between completion of base course and paving and the time between completion of base and paving is reduced to three days, provided the base is free of loose soil or debris. Where prime coat has been omitted and rain occurs, traffic is routed over base course, or paving is delayed, measures shall be taken to restore base course and subgrade to conditions that will meet specifications as directed by the soil engineer. Drainage Positive drainage shall be provided for all surface water to drain toward the curb and gutter, or to an approved drainage channel. Positive site drainage shall be maintained at all times. Water shall not be allowed to pond or seep into the ground. If planters or landscaping are adjacent to paved areas, measures shall be taken to minimize the potential for water to enter the pavement section, such as cut-off walls. etc. Calavera Hills II, LLC W.O. 5354-E-SC College/Cannon Widening, Carlsbad September 18, 2007 FiIe:e:wp9\5300\5354e.pdr Page 4 GeoSoils, Inc. Respectfully sub \ 934 Cer led Engineering -1No.1 \ (P Geologist ti ) Robert G. Crisman Op c' Engineering Geologist, 934 GeoSoils, Inc. OTHER DESIGN PROFESSIONALS/CONSULTANTS The design civil engineer shall review the recommendations provided herein, incorporate those recommendations into their plans, and by explicit reference, make this report part of their project plans. LIMITATIONS The materials encountered on the project site and utilized for our analysis are believed representative of the area; however, soil and bedrock materials vary in character between excavations and natural outcrops or conditions exposed during mass grading. Site conditions may vary due to seasonal changes or other factors. Inasmuch as our study is based Upon our review and engineering analyses and laboratory data, the conclusions and recommendations are professional opinions. These opinions have been derived in accordance with current standards of practice, and no warranty is express or implied. Standards of practice are subject to change with time. GSI assumes no responsibility or liability for work or testing performed by others, or their inaction, or work performed when GSI is not requested to be onsite, to evaluate if our recommendations have been properly implemented: Use of this report constitutes an agreement and consent by the user to all the limitations outlined above, notwithstanding any other agreements that may be in place. In addition, this report may be subject to review by the controlling authorities. The opportunity to be of service is greatly appreciated. If you have any questions, please do not hesitate to call our office. RGC/ATG/PLM/jk Attachment: Appendix - References Distribution: (4) Addressee Calavera Hills II, LLC College/Cannon Widening, Carlsbad File:e:\wp9\5300\5354e.pdr GeoSoils, Inc. W.O. 5354-E-SC September 18, 2007 Page 5 APPENDIX REFERENCES California Department of Transportation, 2006, Caltrans, Standard specifications, May printing. : Carlsbad, City of, 1993, Standards for design and construction of public works improvements in the City of Carlsbad. GeoSoils, Inc., 2007, Review of R-value data, Improvement (widening) 'of College Boulevard (Stations 103 +35 to 118), and Cannon Road (Stations 127 +20 to 159), City. of Carlsbad, San Diego County, California, W.O. 5354-E-SC, dated September 4. 2004a, Revised pavement design report, College Boulevard Stations 78 to 101+75 , Reach 'C, Calavera Hills II, Carlsbad, San Diego County,' California, W.O. 4028-E-SC, dated April 19, 2004, by GeoSoils, Inc. 2004b, Revised pavement design report, College Boulevard, Stations 101 to 118+-10, Reach B, Calavera Hills II, Carlsbad, San Diego County, California, W.O. 4029-E-SC, dated April 23. 2004c, Third revision of pavement design report, Calavera Hills II, Cannon Road Stations 125 to 164, City of Carlsbad, San Diego. County, California, W.O. 4030-E-SC, dated May 14. .' NEWCON90, 1991 Computer program for the determination of asphalt pavement sections, version: April 30. PAVE, Computer program for the determination of asphalt concrete pavement sections. State of California, Department of Transportation, 2006, Highway design manual of instructions, sixth edition, September printing. ' GeoSoils, Inc. ..: . . •... ...UBGRADE4... .!UBRApE:;. :.... TRAFFIC AREA R VALUE (2004) R-VALUE (2007) TRArFIC AREA (Tested 2004) see References LThIS Study (Tested 2007) Cannon Road ... 28.c/I .- 12..ç/1.7...- ..Caonon...Road. (só. slde Stations 125 to 130 - . . Stations 127 to 130 Cannon Road 28 S/1 - 68 57, Cannon Road (no. side) Stations 125 to 130 _____ - Stations 128 to 131 +00 Cannon Road 27 / 25 ç/ Cannon Road (ôsIde) Stations 130 to 135 ' . Stations 130 to 135 Cannon Road 27 - -, 5 Cannon Road (no. side) Stations 130 to 135 Stations 131 to 136+52 Cannon Road 6 5 Cannon Road (sb.slde) Stations 135 to 140 Stations 135 92 tö 140' Cannon Road 6 25 çJ Cannon Road (no. side) Stations 135to14O . . . I' Stations 136+22 to 137 Cannon Road ( 6 6 Cannon Road (no. side) Stations 135+L' to 140 9 . ° Stations 137+40 to 142+92 Cannon Road 5 11 Cannon Road( ld Stations 140+29 to 145+2r . Stations 140+L0 to j459 Cannon Road 5 7 Cannon Road (no. side) Stations 14 O to 145 Stations 142 to 148+00 Cannon Road 6 5 Cannon Road (sot side) . Stations 145 to 15O 2 Stations 145+Lo Cannon Road 6 8 Cannon Road (no. side) Stations 145 to 150 Stations 148 to 153 Cannon Road 6 5 Cannon Road Stations 150+2 to 164 Stations 150to 155+00 ' Cannon Road 6 8 ci " Cannon Road (so. side) Stations 150"M to 164 . Stations 155 to 159 College Blvd. 17 23 c/hf College Blvd.(o. side Stations 101 to 106 . . +00 Stations 103 to 108 College Blvd. 13 ~ 22 S/j y College Blvd.(â. slde. Stations 10(i to 111 Stations 10t3 to 112+96 College Blvd. 13 1/ 14 5/7 College Blvd. (no. side) Stations OVLO iii Stations 106 to 111+125 College Blvd. 26 22 :5/ College Blvd. tsb. side) Stations 11to 114 D/I q Stations 112to 115 College Blvd. 21 r/,. College Blvd. (no. side Stations 114to 118 . Stations 111"1-'to 116 1 * Structural section to consist of 6 inches asphaltic concrete over 20 inches aggregate base. Calavera Hill; II, LLC W.O. 5354-E-SC College & Cannon, Carlsbad Septoinber4, 2007 F1le:e:\wp9\53u0\5354e.ror.memo LcJe•& Page2