1. Brookeville Bypass Final Design Presentation Initech May 6, 2004

2. The Initech Team Project Manager – Matt Young Assistant PM – Jack Kwait-Blank Transportation Engineer – Amanda Gassman Structural Engineer – Matt Holland Geotechnical Engineer – Diana Castro Drafting Engineer – Joseph Lemich

3. General Purpose – To remove the continuously increasing traffic congestion from the town of Brookeville – To improve traffic safety and transportation operations –To preserve the historic district

4. General Needs –Traffic is estimated to be 18,000 vehicles per day in the year 2020 with the encroaching development of the nearby area of Olney –Replace the substandard road geometries that exist currently –A stop sign located at the junction of 97 and Market Street impedes traffic flow and creates adverse environmental conditions –Operating at a Level of Service (LOS) D and is estimated to deteriorate to LOS F during peak PM hours in the year 2020 if no improvements are made –The accident rate in Brookeville is 154.1 per one hundred million vehicle miles (acc/100mvm)

5. General Classification: Minor / Rural Arterial Design Speed: 55 MPH Posted Speed: 45 MPH Total Length: 6050 ft Max Superelevation Rate (e): 6% Stopping Sight Distance = 495 ft Minimum Radius of curvature = 1100 ft Crest/Sag K=115/114

6. General Crossings: –Market Street: Grade-separated –At-grade at MD97

7. Alternate Alignment Horizontal Alignment Alternate Design Pros –1 Bridge –1 Culvert –400 ft parkland Cons –Right of Way –9 Houses –Wetlands –Lower Design Speed –Very Long

8. Alignment Horizontal Alignment

9. Alignment Vertical Alignment proposed current surface level

10. Alignment Typical Section

11. Alignment Typical Sections –2 Lanes –12 ft lanes –6 ft shoulders –Open road –Non-divided

12. Alignment Right-of-Way Impacts –1850 ft of parkland including 200 ft of Shingle Oak Forest –No wetlands impacted –Cross 2 streams, culvert Meadow Branch Stream, bridge Reddy Branch Stream –Interacts with one house –Does not effect proposed Park and Ride –Does cross through M-NCPPC Reserved land –Avoids Brookeville Historical District –Cross Market Street, grade-separated with bridge

13. Alignment Structures –Bridge –Culvert Cut and Fill Volumes –Cut: 175534 cy –Fill: 61492 cy –Net: 114042 cy cut

14. Pavement Design  Design ESAL: 5.5 Million  PSI = po – pt = 4.2 – 2.5 = 1.7 Z R = 92% = -1.405 S o = 0.45 M R = 5000 M R = 40000 W 18 = 5,500,000,000

15. Pavement Design Process: SN = a 1 D 1 + a 2 D 2 m 2 SN 1 = 2.47 (using solver) = a 1 D 1 2.47 =.44 * D 1  D 1 = 5.6136 inches SN = 5.3 (using solver) SN 2 = SN - a 1 D 1 SN 2 = 5.3 -.44 * 5.6136 SN 2 = 2.83 2.83 = a 2 D 2 m 2 2.83 =.17 * D 2 * 1.25  D 2 = 13.3176 inches

16. Pavement Design Results: Asphalt thickness D 1 = 6 inches Base thickness D 2 = 14 inches

17. Hydraulics Drainage: –9 ft long 16.7% safety grading –4:1 slope for drainage –2 ft wide ditch Culverts: –10 ft x 10 ft –Thickness 5 ft on sides and 5.5 ft on bottom –Large for floodplain planning 100 year located inside floodplain –198 ft long

18. Hydraulics A B C D

19. Structures Bridge –Crosses Market Street and Stream –Concrete Deck and Steel Girders –300 ft x 42 ft –Rounded Columns –Steel Girders –Chosen for cost- effectiveness –Piles for strength in poor soil conditions near creek

20. Structures Culverts –10 ft x 10 ft –198 ft long –Water maintenance

21. Traffic After Construction After Construction of Bypass Bypass: –Peak Level of Service: B –Off-Peak Level of Service: A Old MD-97: –Peak Level of Service: A –Off-Peak Level of Service: A

22. Traffic After Construction

23. Intersections –South: traffic signal –North: traffic signal Delay: Minimal –Lights will be phase timed according to time of day and majority direction of flow

24. Construction Special Construction Issues –Environmental Issues –Close to Residential Area Noise Concerns Resident Disruptions Schedule –Start: 5/13/04 –Finish: 11/29/04 –Total Duration: 6.5 months

25. Construction

26. Cost Estimating Category 1: $1.2 M Category 2: $5.4 M Category 3: $1 M Category 4: $1 M Category 5: $210 K Category 6: $9 K Category 7: $200 K Category 8: $300 K Total Estimated Cost: $16.6 M

27. Thank You Your time is valuable to us and we appreciate your questions.