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Home My WebLink AboutCT 01-01; CALAVERA HILLS VILLAGE; PAVEMENT DESIGN REPORT; 2003-06-30c.roto( Geotechnical -,Geologic* Environmental 5741 Palmer Way • Carlsbad California 92008 • (760) 438-3155 • FAX (760) 931-0915 June 30, 2003 W.O. 3459-E-SC Calavera Hills II, LLC 2727 Hoover Avenue National City, California 91950 Attention Mr. Don Mitchell Subject: Pavement Design Report, Calavera Hills II, Village L-2 (Granite Court); Carlsbad Tract 01-02, City of Carlsbad, San Diego County, California Dear Mr. Mitchell In accordance with your request, GeoSoils, Inc. (GSI), has prepared preliminary design and construction recommendations for asphalt concrete (AC) pavement at the subject site. The scope of services provided in preparation of this report included representative sampling of the Street subgrade, "R"-value testing, and engineering analysis of pavement design PAVEMENT DESIGN Pavement section design was performed in accordance with the California Department of • * Transportation (Caltrans) Highway Design Manual of Instructions and -the City of Carlsbad : . Standard Drawings (see the Appendix). Pavement sections presented are based on the aforementioned criteria and resistance value ("R"-value) data (see the attached Figures 1 • and 2) 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. Pavement design was aided with the computer software programs PAVE and NEWCON9O ASPHALT CONCRETE PAVEMENT Structural Section "R"-values of 22 and 26 were determined for subgrade soils onsite and used in pavemeht -. design. The recommended pavement sections are presented in the following table:• All pavement installation, including preparation and compaction of subgrade, compaction of base material, and placement and rolling of asphaltic concrete, should be done in accordance with the City of Carlsbad guidelines and under the observation and testing of the project geotechnical engineer and/or City of Carlsbad. The recommended pavement sections are meant as minimums; If thinner or highly variable pavement sections are constructed, increased maintenance and repair may be needed. Positive site drainage should be maintained at all times. Water should not be allowed to pond or seep into the ground. If planters or landscaping are adjacent to paved areas, measures should be taken to minimize the potential for water to enter the pavement section. If the ADT (average daily traffic) or ADTT (average daily truck traffic) increases beyond that intended, as reflected by the traffic index(s) used for design, increased maintenance and repair could be required for the pavement section. PAVEMENT GRADING RECOMMENDATIONS General All section changes should 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 should be present for the preparation of subgrade, base rock, and asphalt concrete. Calavera Hills II, LLC W.O. 3459-E-SC Calavera Hills II, Village L-2 (Granite Court) June 30, 2003 File:e:\wp9\3400\3459e.I2.pdr Page 2 GeoSoils, Inc. Subgrade Within street and parking areas, all surficial deposits of loose soil material should be removed and recompacted as recommended. After the loose soils are removed, the bottom is.to be scarified to a depth of approximately 6 inches, moisture conditioned as necessary, and compacted to 95 percent of the maximum laboratory density, as determined by ASTM Test. Designation D-1 557. . Deleterious material, excessively wet or dry pockets, concentrated zones of oversized rock fragments, and any other unsuitable materials encountered during grading should be removed. The compacted fill material should then be brought to the elevation of the proposed subgrade for the pavement. The subgrade should be proof-rolled in order to ensure a uniform firm and unyielding surface. All grading and fill placement should 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-1 557. Base aggregate should be in accordance with the "Standard Specifications for Public Works Construction" (green book) 1997 edition or standard Caltrans Class 2 base rock (minimum "R"-value = 78). Paving Prime coat may be omitted if all of the following conditions are met: 1.. 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. • • • • Calavera Hills II, LLC • • • W.O.-3459-E-SC Calavera Hills II, Village L-2 (Granite Court) • • June 30, 2003 Fi1e:e:\wp9\3400\3459e.I2.pdr • • • Page 3 GeoSoils, Inc. Drainage Positive drainage should be provided for all surface water to drain toward the curb and gutter, or to an approved drainage channel. Positive site drainage should be maintained at all times. Water should not be allowed to pond or seep into the ground. If planters or landscaping are adjacent to paved areas, measures should be taken to minimize the potential for water to enter the pavement section, such as cut-off walls;. LIMITATIONS The materials encountered on the project site and utilized in our laboratory study are '• believed to be representative of the total area. However, variations from the anticipated conditions and actual field conditions should be expected; Test excavations are reflective • of the soil and rock materials only at the specific location explored. Site conditions' may. vary due to seasonal changes or other factors. '• • , ••' Since our study is based on the earth materials obtained in the field onsite, selective' laboratory testing, and engineering analyses, the conclusions and recommendations are professional opinions based upon those parameters. These opinions have -been derived .. in accordance with the current standards of practice and no warranty is expressed or implied. Standards of practice are subject to change in time. Overall, the enclosed results represent our professional opinions and evaluations which were performed within the , •. constraints of a budget. GSI assumes no responsibility or liability for work or testing performed by others.' ' ' '• ' ' 2 • Calavera Hills II, LLC ' ' ' ' W.O. 3459-E-SC. Calavera Hills II, Village L-2 (Granite Court , ' • ' • . June 30, 2003 FiIe:e:\wp9\34003459eJ2.pdr •• ' ' ' Page 4 GeoSoils, Inc. , " The opportunity to be of service is greatly appreciated. If you have any questions, please do not hesitate to call our office. Respectfully G. Mo. 1934 4 Robert G. Crisman N f Or. David W. Skelly • Engineering Geologist, CE Civil Engineer, ACE 7857 RGC/JPF/DWS/Jk Attachments: Appendix - References • • Figures 1 and 2 - "R"-value Test Results Distribution (4) Addressee (1) Jobsite, Attention: Mr. Tom .LaMarca • Caiavera Hills ii, LLC W.O. 3459-E-SC Caiavera Hills.Ii, Village L-2 (Granite Court) • • June 30, 2003 Fi1e:e:\wp9\3400\3459e.12.pdr • • • Page 5 GeoSoIls, Inc. • •• . APPENDIX •. REFERENCES •. American Public Works Association, 2000, "Greenbook" standard specification for public works construction ,California Department of Transportation, 1995, Caltrans, standard specifications, July printing Carlsbad, City of, 1993, Standards for design • and construction of public works • improvements in the City of Carlsbad. • • • NEWCON90, 1991 Computer program forthe 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, 1987, Highway design manual of • instructions, fourth edition.. : • .' • DESIGN CALCULATION DATA Traffic Index, assumed 4.5 Gravel equivalent factor, assumed 1.25 Expansion, stability equilibrium 0 R-Value by expansion NA R-Value by exudation 22 R-Value at equilibrium 22 SAMPLE INFORMATION Expansion, Stability Equilibrium 2.00 J1.50 1.00 0. C 0 0 0.50 0. 0.00 lL 0.00 TEST SPECIMAN A B C D Compactor air pressure Psi 350 260 140 Water added 5.1 6.0 7.0 Moisture at compaction % 9.0 10.0 11.0 Height of sample IN 2.46 2.44 2.51 Dry density PCF 129.4 130.2 126.6 R-Value by exudation 72 43 20 R-Value by exudation, corrected 72 41 20 Exudation pressure PSI 545 431 288 Stability thickness FT 0.32 0.66 0.92 Expansion pressure thickness FT 0.10 0.07 0.00 GeoSoils, Inc. 5741 Palmer Way èqS4i1$i4. Carlsbad, CA 92008 Telephone: (760) 438-3155 Fax: (760) 931-0915 - VALUE TEST RESULTS Number 3459-E-SC Date: Jun-03 Figure: V TEST SPECIMAN A B C D Compactor air pressure PSI 240 160 80 Water added % 4.4 5.0 5.8 Moisture at compaction - % 9.5 10.2 11.0 Height of sample IN 2.4 2.48 2.5 Dry density PCF 131.4 127.1 126.0 R-Value by exudation 42 29 22 R-Value by exudation, corrected 40 29 22 Exudation pressure PSI 545 3611 251 Stability thickness FT 1 0.67 0.82 0.90 Expansion pressure thickness FT 1 0.07 0.001 0.00 SAMPLE INFORMATION DESIGN CALCULATION DATA Traffic Index, assumed 4.5 Gravel equivalent factor, assumed 1.25 Expansion, stability equilibrium 0 R-Value by expansion NA R-Value by exudation 26 R-Value at equilibrium 26 Expansion, Stability Equilibrium 2.00 I 1.00 C 0 0.50 a Ui 0.00 -l.- 0.00 0.50 1.00 1.50 Stability Thickness (ft) GeoSoils, Inc. - VALUE TEST RESULTS 5741 Palmer Way Project: MCMILLIN Carlsbad, CA 92008 Telephone: (760) 438-3155 Number 3459-E-SC Fax: (760) 931-0915 Date: Jun-03 Figure: 2