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Home My WebLink About3338; Agua Hedionda & Calavera Creek Dredging; El Camino Real & Cannon Road Bridges; 2007-01-19El Camino Real Bridge and Cannon Road Bridge Hydraulic Modification Type Selection Report Prepared by Simon Wong Engineering 9968 Hibert Street San Diego, CA 92131 In Association with Brown and Caldwell 9665 Chesapeake Drive, Suite San Diego, CA 92123 January 19,2007 1 1 El Camino Real DRAFT FOR REVIEW El Camino Real Bridge and Cannon Road Bridge Hydraulic Modification Type Selection Report Bridge and Cannon Road Bridge Hydraulic Modification Type Selection Report 1 1 1 1 1 IV^P 1 1 1 1 1 1 1 1 1 Section I. Introduction II. Existing Overcrossings III. Infill Alternatives El Camino Real Bridge Cannon Road Bridge IV. Seismic Assessment V. Utilities VI. Geology VII. Aesthetics VIII. General IX. Structure Costs Appendix A General Plan Estimates SWE Job No. 500-734 Table of Contents Page No. 1 1 1 2 2 2 3 3 4 4 4 I I I I I I I I I I I I I I I DRAFT FOR REVIEW El Camino Real Bridge and Cannon Road Bridge Hydraulic Modification Type Selection Report Pagel I. Introduction Simon Wong Engineering, in association with Brown and Caldwell, has been retained to prepare Plans, Specifications and Estimates (PS&Es) for recommended hydraulic improvements to El Camino Real Bridge and Cannon Road Bridge, over the Agua Hedionda Creek. The identified hydraulic improvements consist of filling in the void space between the existing pile extensions. This will reduce turbulence and increase flow beneath the structures. This report is based upon guidelines and as-built plans obtained from Brown and Caldwell. The development and evaluation of the alternatives were based upon current topographic mapping, field survey data, hydraulic studies, and preliminary geotechnical information provided by Brown and Caldwell. The project proposes the following structure construction: • El Camino Real Bridge: Infill area between columns and add debris nose. • Cannon Road Bridge: Infill area between columns and add debris nose. II. Existing Overcrossings El Camino Real Bridge is a 3-span structure comprised of simply supported prestressed precast slab units, topped with a continuous cast in place reinforced concrete slab. The bridge is supported on concrete seat abutments and pile extensions and is founded on driven pile foundations. Cannon Road Bridge is a 3-span structure comprised of a reinforced concrete slab. The bridge is supported on concrete seat abutments and pile extensions and is founded on driven pile foundation. El Camino Real Bridge El Camino Real Bridge was originally constructed in 1970 and modified in 1998 to accommodate additional sidewalk and utility supports. Cannon Road Bridge was originally constructed in 1998 with no modifications to the existing structure taking place. Both structures are located over the Agua Hedionda Creek and located in the City of Carlsbad. III. Infill Alternatives The purpose of the infill wall between the columns is to increase the hydraulic efficiency of the structure and eliminate areas where debris build-up and turbulence occur. Different infill alternative options were discussed and included the use of treated timber and reinforced concrete. The use of the timber to infill the area between the columns was not chosen due to maintenance and durability concerns. Reinforced concrete infill walls will require little maintenance and can sustain impacts from floating debris without damage. However, the use of reinforced concrete infill wall sections SWE Job No. 500-734 I I I I I I I I I I I I I I DRAFT FOR REVIEW El Camino Real Bridge and Cannon Road Bridge Hydraulic Modification Type Selection Report Page 2 will require seismic evaluation to assure that the addition of the walls will not adversely affect the seismic performance of the structure. El Camino Real Bridge After a field review of the structure and site and a careful review of the as-built plans, it was determined that an infill section that also encased the pile extensions would be required. This is necessary since the as-built plans identify several different precast piles that could be used and either driven full length or extended. The actual piles used and whether they were driven full length or extended was not identified. In order to assure that the proposed construction would not damage any prestressing that may be present in the pile extensions, a wall that encases the existing piles was required. %' "—• Cannon Road Bridge The Cannon Road Bridge was constructed in 1998 and has as-built plans that identify the pile and pile extension used and their limits. The thoroughness of the as-built plans resulted in a proposed reinforced concrete infill wall section that matches the width of the existing pile extensions and provides a smooth wall section. Both bridges will have debris noses designed in accordance with HEC-9 Section 6.3.2 "Debris Fins for Bridges." IV. Seismic Assessment The proposed reinforced concrete infill wall sections will affect how the bridges perform during a seismic event. Both structures were evaluated in their as-built condition and then again with the proposed walls in place with the following results: Cannon Road Bridge Typical Bent Bridge Name El Camino Real Bridge Cannon Road Bridge Existing Condition Longitudinal AD 11.30" 2.17" Ac 11.49" 28.81" Transverse AD 9.08" 11.82" Ac 10.49" 28.81" Infill Wall Condition Longitudinal AD 11.19" 2.17" Ac 11.77" 28.81" Transverse AD 3.75" 5.07" Ac 3.87" 8.52" From the results above it can be seen that both structures are seismically sufficient in the existing condition and also in the infill wall condition. Therefore, the proposed infill walls will not adversely affect either structure during a seismic event. SWE Job No. 500-734 I I I I I I I I I I I V. DRAFT FOR REVIEW El Camino Real Bridge and Cannon Road Bridge Hydraulic Modification Type Selection Report Page 3 Utilities Dry utilities exist on both sides of the El Camino Real Bridge with a four-inch high pressure gas line located on the south side supported off of the pedestrian widening that was modified in 1998, and an unknown utility located on the north side. Neither ^^^ of these utilities will conflict with the proposed work ^^^^ ^^^^^t& of an infill wall or debris nose. Wet utilities, in the form of a 24-inch reclaimed water line, are located on the east side of the Cannon Road Bridge and a 16-inch reclaimed water line, and an 8-inch water line are located on the west side of El Camino Real Dry Utilities North Side the structure. The wet utilities on the west side of the Cannon Road Bridge will require design modifications to a standard debris nose. The infill wall will not be affected by these utilities. Cannon Road Wet Utilities East Side VI. Geology The project site is situated in the coastal foothills section of the Peninsular Ranges Geomorphic Province. This geomorphic province encompasses an area that extends approximately 900 miles from the transverse ranges and the Los Angeles Basin south to the southern Tip of Baja California. Alluvium was encountered in the surficial subsurface evaluation of the site. Though not encountered in these evaluations, Santiago Formation was encountered at depth during previous investigations in 1985. The alluvium encountered generally consisted of brown, moist to wet, stiff, sandy clay and brown to dark brown, wet to saturated, loose to medium dense, fine to coarse sand and silty clayey sand. Based on previous investigations alluvium beneath the surface generally consisted of loose to dense, clayey sands, silty sands and soft to stiff sandy silty clay. Groundwater is expected to be at the water level of Agua Hedionda and Calavera Creeks. Groundwater should be anticipated during construction. The site is located approximately 6.5 miles west of the Rose Canyon Fault, which could generate an earthquake with a magnitude of 7.2, resulting in a peak horizontal bedrock acceleration of 0.40g, SWE Job No. 500-734 DRAFT FOR REVIEW m El Camino Real Bridge and Cannon Road Bridge Hydraulic Modification Type Selection Report Page 4 In the event of a design level earthquake with a peak bedrock acceleration of 0.40g liquefaction may occur within layers of generally loose to medium dense sandy alluvium from the creek channel surface to a depth of approximately 25 feet below the channel elevation. In 1985 a riprap channel lining was installed starting 15 feet north of the El Camino Real Bridge to approximately 200 feet south of the future location of the Cannon Road Bridge. The riprap lining is comprised of half-ton riprap 3.4 feet thick with one foot of decomposed granite filter. VII. Aesthetics In general, the infill walls between the pile extensions will not be visible from the adjacent roads. The debris nose will be visible from the adjacent roads and will extend approximately 26 feet upstream of the limits of the existing bridges. VIII. General The infill walls and debris nose construction is located entirely within the limits of the Agua Hedionda Creek channel. Contractor staging areas and storage facilities have not yet been identified for this project. The work on each structure is anticipated to be performed concurrently with the infill walls of each structure constructed first and then the debris nose. No disruption to vehicular or pedestrian traffic is anticipated. Best Management Practices in accordance with the Storm Water Data Report will be required to minimize sediment impacts to the creek. IX. Structure Costs Reinforced Concrete Infill Walls and Debris Nose Structure El Camino Real Bridge Cannon Road Bridge Total Bridge Type Reinforced Concrete Infill Wall and Debris Nose Reinforced Concrete Infill Wall and Debris Nose Cost $ 690,000.00 $ 590,000.00 $1,280,000.00 p m mm mm Note: Costs include 10% mobilization and 25% contingency See Appendix "A" for General Plan Estimates SWE Job No. 500-734 DRAFT FOR REVIEW El Camino Real Bridge and Cannon Road Bridge Hydraulic Modification Type Selection Report Appendix A General Plan Estimates m in P to SWE Job No. 500-734m BRIDGE GENERAL PLAN ESTIMATE BRIDGE TYPE LENGTH Cannon Road Bridge 3-Span Reinforced Concrete Slab 134 ft. X WIDTH Bridge 95.00 ft.= AREA BRNO DIST 12,730 ft2 |CO SD REC'D BY RTE | DESIGN SECTION SWE PROJECT INCLUDES AND $ ROADWORK QUANTITIES BY A. Sanford QUANT. CHECKED BY DATE 1/19/07 DATE CHG UNIT AND EA ESTIMATE NO. PRICE BY COST INDEX NO. 1 2 3 4 5 CONTRACT ITEMS STRUCTURE EXCAVATION (BRIDGE) (Type D) STRUCTURAL CONCRETE, BRIDGE FOOTING STRUCTURAL CONCRETE, BRIDGE BAR REINFORCING STEEL (BRIDGE) DRILL AND BOND DOWELS UNIT CY CY CY LB LF QUANTITY 183 0 153 21,780 532 PRICE $400 $1,046 $1,046 $1.40 $55.00 SUB TOTAL MOBILIZATION 10% SUB TOTAL CONTINGENCIES @ 25% TOTAL COST PER SQUARE FOOT FOR BUDGET PURPOSES - SAY AMOUNT $73,200 $0 $160,038 $30,492 $29,260 $292,990 $29,299 $322,289 $80,572 $402,861 $31.65 $405,000 COMMENTS: 4 185,000 BRIDGE GENERAL PLAN ESTIMATE BRIDGE TYPE LENGTH El Camino Real 3-Span Prestressed Concrete Slab 113.167 ft. X WIDTH 110.00 unit Continuous Reinforced ft. =AREA 12,448 ( BRNO DIST11 ft2 |CO SD REC'D RTE BY I DESIGN SECTION SWE PROJECT INCLUDES AND $ ROADWORK QUANTITIES BY A. Sanford QUANT. CHECKED BY DATE 1/19/07 DATE CHG UNIT AND EA ESTIMATE NO. PRICE BY COST INDEX NO. 1 2 3 4 5 6 CONTRACT ITEMS _| STRUCTURE EXCAVATION (BRIDGE) (Type D) STRUCTURE EXCAVATION (ROCK SLOPE PROTECTION) STRUCTURAL CONCRETE, BRIDGE FOOTING STRUCTURAL CONCRETE, BRIDGE BAR REINFORCING STEEL (BRIDGE) ROCK SLOPE PROTECTION UNIT CY CY CY CY LB CY QUANTITY 71 114 0 240 19,186 90 PRICE $400 $270 $1 ,046 $1 ,046 $1.40 $165 SUB TOTAL MOBILIZATION 10% SUB TOTAL CONTINGENCIES @ 25% TOTAL COST PER SQUARE FOOT FOR BUDGET PURPOSES - SAY AMOUNT $28,400 $30,780 $0 $251 ,040 $26,860 $14,850 $351,930 $35,193 $425,836 $106,459 $532,295 $42.76 $535,000 COMMENTS: BRIDGE GENERAL PLAN ESTIMATE BRIDGE TYPE LENGTH El Camino Real 3-Span Prestressed Concrete Slab unit Continuous Reinforced ( BRNO DIST11 |CO SD REC'D BY RTE | 113.167 ft. X WIDTH 110.00 ft. =AREA 12,448 ft*p» m P m DESIGN SECTION SWE PROJECT INCLUDES AND $ ROADWORK QUANTITIES BY A. Sanford QUANT. CHECKED BY DATE 1/19/07 DATE CHG UNIT AND EA ESTIMATE NO. PRICE BY COST INDEX NO. 1 2 3 4 5 6 CONTRACT ITEMS STRUCTURE EXCAVATION (BRIDGE) (Type D) STRUCTURE EXCAVATION (ROCK SLOPE PROTECTION) STRUCTURAL CONCRETE, BRIDGE FOOTING STRUCTURAL CONCRETE, BRIDGE BAR REINFORCING STEEL (BRIDGE) ROCK SLOPE PROTECTION UNIT CY CY CY CY LB CY QUANTITY 103 167 13 280 24,349 158 PRICE $400 $270 $1,046 $1,046 $1.40 $165 SUB TOTAL MOBILIZATION 10% SUB TOTAL CONTINGENCIES @ 25% TOTAL COST PER SQUARE FOOT FOR BUDGET PURPOSES - SAY AMOUNT $41,200 $45,090 $13,598 $292,880 $34,089 $26,070 $452,927 $45,293 $548,041 $137,010 $685,051 $55.03 $690,000 m m B E i m pin m m mm COMMENTS: m to p In pm m m BRIDGE GENERAL PLAN ESTIMATE 1BRIDGE TYPE LENGTH Cannon Road Bridge 3-Span Reinforced Concrete 134 ft. X WIDTH Slab Bridge 95.00 ft.= AREA BRNO DIST 12,730 ft2 |CO SD REC'D BY RTE | DESIGN SECTION SWE PROJECT INCLUDES AND$ROADWORK QUANTITIES BY A. Sanford QUANT. CHECKED BY DATE 1/19/07 DATE CHG UNIT AND EA ESTIMATE NO. I PRICE BY COST INDEX | NO. 1 2 3 4 5 CONTRACT ITEMS STRUCTURE EXCAVATION (BRIDGE) (Type D) STRUCTURAL CONCRETE, BRIDGE FOOTING STRUCTURAL CONCRETE, BRIDGE BAR REINFORCING STEEL (BRIDGE) DRILL AND BOND DOWELS UNIT CY CY CY LB LF QUANTITY 341 19 190 29,970 532 PRICE $400 $1,046 $1,046 $1.40 $55.00 SUB TOTAL MOBILIZATION 10% SUB TOTAL CONTINGENCIES @ 25% TOTAL COST PER SQUARE FOOT FOR BUDGET PURPOSES - SAY AMOUNT $136,400 $19,874 $198,740 $41,958 $29,260 $426,232 $42,623 $468,855 $117,214 $586,069 $46.04 $590,000 c p I* COMMENTS: P to P Ito