DESIGN CRITERIA MEMORANDUM
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1 State Route 49 Realignment Study DESIGN CRITERIA MEMORANDUM ATTACHMENT G
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3 SR 49 Realignment Study STATE ROUTE 49 El Dorado to Coloma El Dorado County, CA DESIGN CRITERIA MEMORANDUM Introduction The El Dorado County Transportation Commission (EDCTC) has initiated the State Route 49 (SR 49) Realignment Study, which is a feasibility study for the realignment of SR 49 from its intersection with Pleasant Valley Road in the town of El Dorado to the intersection of SR 49 with Lotus Road in the town of Coloma. The SR 49 Realignment Study will explore alternative alignments of SR 49 between Coloma and El Dorado that will improve traffic operations on the state and regional transportation system. Alignments that are examined will eliminate the existing alignment of SR 49 through Marshall Gold Discovery State Historic Park and the at-grade intersection of SR 49 and Highway 50. The purpose of this Design Criteria Memorandum is to present a range of design criteria that will be utilized by TY Lin International when analyzing alternative alignments. The proposed design criteria will be used to estimate costs for right-of-way acquisition, construction, and environmental mitigation for up to three alternatives. design criteria will also help determine the feasibility and constructability of alternative alignments. Design criteria were collected from the following four sources: 1. El Dorado County Highway Design Manual and Std. Plans(Local Agency Standards) 2. El Dorado County Drainage Manual (Local Agency Standards) 3. Caltrans Design Information Bulletin (DIB) 79-03; (design guidance for resurfacing, restoration, and rehabilitation (3R) type projects) 4. Caltrans Highway Design Manual This document shall be updated on an as-needed basis. Latest update dated December 18,
4 DESIGN CRITERIA Table 1: Functional Classification State Route 49 (SR 49) Designation Classification Terrain Conventional Hwy Rural/Urban (1) Rolling Table 2: Design Designation SR 49 (existing from Caltrans SR 49 TCR, September 2000 ) Segment 2 Segment 3 Segment 4 ADT (2010) ADT (2030)* DHV* Truck % (T) 6% 6% 10% Directional Split (D) 55% 55% 64% LOS E F E Concept LOS E F E * ADT values for the year 2030 are projected based on given annual % traffic growth values contained in the TCR. DHV calculated using 0.15*ADT. Table 3: General Roadway Design Criteria Caltrans HDM Basic Design Criteria Design Speed (mph) Index HDM Table Table SR 49 (Rural) SR 49 (Urban) Design Vehicle Index Index SR 49 WB40/CA LEGAL CA LEGAL CA LEGAL CA LEGAL Minimum Sight Distances Stopping (ft) HDM Table Table SR 49 (Rural) HDM SR 49 (Urban) HDM Passing (ft) HDM Table Table SR 49 (Rural) N/A SR 49 (Urban) N/A Decision (ft) HDM Table Table SR 49 (Rural) N/A SR 49 (Urban) N/A
5 Caltrans HDM Geometric Design Criteria Typical Cross Section Minimum Lane Width (ft) Index Index Index SR 49 (Rural) SR 49 (Urban) Minimum Shoulder Width (ft) Index Index Table SR 49, ADT < or 4, ADT < SR 49, 251 < ADT < SR 49, 1001 < ADT < , ADT > 400 SR 49, ADT > Minimum Structural Section (AC/AB) SR 49 HDM Ch. 610 HDM Ch. 610 HDM Ch. 610 TBD (2) Minimum R/W Width (ft) Index Index SR 49 (Rural) (3)(4) (3)(4) SR 49 (Urban) (3)(4) 130 Normal Cross Slope (%) Index (2)(b) Index 301.2(2)(a) SR min / 3 max 2 2 (5) Side (Cut & Fill) Slopes Index Index SR 49 2H:1V 2H:1V (CUT); 4H:1V (FILL) 2H:1V (CUT); 4H:1V (FILL) 1.5H:1V (CUT); 2H:1V (FILL) (6) Minimum Bike Lane Width (ft) Topic (1)( c) Index (1)( c) SR 49 (Rural), w/o curb & gutter HDM (7) SR 49 (Urban), w/ curb & gutter HDM (7) Minimum Sidewalk Width (ft) Std. Plan RS Index SR (8) Curb and Gutter Type Std. Plan RS Index not recommended for speeds > 45mph not recommended for speeds > 45mph Type 2 (for V < 45 mph) (8) SR 49 Type 2 Choker Width/Shoulder Backing (ft) HDM Figure Figure SR 49 N/A Horizontal and Vertical Alignment - 3 -
6 Caltrans HDM Maximum Superelevation (%) Index HDM Table Table SR 49 (Rural) SR 49 (Urban) Min Horizontal Curve Radius (ft) Index HDM Table Table SR 49 (Rural) SR 49 (Urban) Profile Grade (%) (min/max) Index HDM Table Table SR 49 (Rural) HDM 0.3 / / / 5 (9) SR 49 (Urban) HDM 0.3 / / / 7 (9) Maximum Grade Break w/o Curve (%) Index Index SR 49 HDM Minimum Vertical Curve Length (ft) Index Index SR 49 (Rural) HDM 10*V 10*V 10*V SR 49 (Urban) HDM 10*V 10*V 10*V SR 49, A < 2% or V < 40 mph HDM Clearances Clear Recovery Zone (ft) Minimum Horizontal Clearance (ft) 309.1(2) Index 309.1(2) SR 49 N/A (10) 309.1(3)( c) 4 or Std. shoulder width Index 309.1(3)( c) 4 or Std. shoulder width 4 or Std. shoulder width SR 49 N/A Minimum Vertical Clearance (ft) Index SR 49 N/A Intersection Criteria Minimum Curb Return/Turning Radius (ft) Intersection/Corner Sight Distance (ft) 404.3(3) Index 404.3(3) SR 49 N/A HDM Table 405.1A Table 405.1A SR 49 (Rural) N/A SR 49 (Urban)
7 Drainage Cross Drainage Storm Frequency (Culverts) Caltrans HDM 821.3(2) Index 821.3(2) SR 49 N/A 100 yr 100 yr 100 yr Caltrans HDM Roadway Drainage Storm Frequency (Spread) EDDM Index HDM Table Table SR 49 (Rural) 10 yr 25 yr 25 yr 25 yr SR 49 (Urban) 10 yr 10 yr 10 yr 10 yr *Local agency standards taken from El Dorado County Highway Design Manual ( and the County of El Dorado Drainage Manual (EDDM) ( **Caltrans DIB gives design guidance and standards for Roadway Rehabilitation (3R) Projects. Design Criteria not fully covered by DIB will default to the Caltrans Highway Design Manual (HDM) criteria for new construction, unless noted otherwise. Notes: (1) The project area is mostly rural. However, there are sections of urban classification including the areas within the city limits of Placerville, El Dorado, and Diamond Springs. (2) Structural section (AC/AB) will be determined from HDM Ch. 610 using projected traffic volumes for proposed alignments and assumed minimum R-values (3) DIB does not specify a minimum R/W width. The 82 shown here is meant to convey the width of R/W required to construct the minimum widths of the cross section components that are specified by DIB 79-03, which sum to the full R/W width. 82 = 24 (2-12 lanes) + 16 (2-8 shldrs) + 6 (2-3 chokers) + 36 (2-18 catch to hinge). The 40 shown here is meant to convey the width of R/W under several constraints; therefore, limited to edge of shoulder to edge of shoulder. 40 = 24 (2-12 lanes) + 16 (2-8 shldrs). (4) Recommended 130 minimum width will be used when feasible. (5) Normal Cross Slope for all widening and overlays will use % range; all new construction will use 2% Normal Cross Slope. (6) Flatter side slopes (e.g. 3H:1V Cut and 4H:1V Fill) will be used when feasible. (7) Bike lanes to be included as part of the required paved shoulder. (8) Use of sidewalk and or curb and gutter is not anticipated except in select locations where pedestrian access improvements are necessary or in urban areas. Where signs or utility poles are located within sidewalk, a minimum 4 clear width shall be provided (per ADA). (9) Profile grades not exceeding 7% may be used in areas where terrain is considered mountainous
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