Butchers Hill. Greening Feasibility FINAL REPORT MAY 2009 N PORT ST N WOLFE ST S MADEIRA ST. Submitted To: Submitted By:

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1 S WOLFE ST N CASTLE ST N WASHINGTON ST S WASHINGTON ST S CHAPEL ST S DURHAM ST S DUNCAN ST N MADEIRA ST N MONTFORD AVE Butchers Hill Greening Feasibility N DUNCAN ST MULLIKIN ST N PORT ST N WOLFE ST E FAYETTE ST N CHAPEL ST N CHESTER ST N BRADFORD ST E FAIRMOUNT AVE MOYER ST E BALTIMORE ST BOYER S CASTLE ST S CHESTER ST BOYER ST S PATTERSON PARK AVE E LOMBARD ST E PRATT ST S MADEIRA ST S COLLINGTON AVE FINAL REPORT MAY 2009 Submitted By: Rummel, Klepper & Kahl, LLP Consulting Engineers Baltimore, Maryland Submitted To: Baltimore City Department of Public Works Water Quality Management Office Baltimore, Maryland

2 TABLE OF CONTENTS Introduction... 1 Neighborhood Description... 1 Greening Techniques... 2 Corner Curb Bump-outs... 2 Flow Through Planters... 3 Tree Planting Strips... 3 Site Descriptions... 4 Site 1: Collington Avenue between Baltimore and Fairmount... 5 Option A: Corner Bump-Out at Baltimore Street... 5 Option B: Corner Bump-Out at Fairmount Street... 6 Site 2: Fairmount Avenue at Chester Street... 7 Option A: Corner Bump-Out at Fairmount Avenue and Chester Street... 7 Option B: Flow Through Planters or Tree Planting Strips... 8 Site 3: Collington Avenue between Lombard and Baltimore Streets... 9 Option A: Flow Through Planter or Tree Planting Strips... 9 Option B: Corner Bump-Out at Collington and Lombard Site 4: Chester Street between Lombard and Pratt Streets Option A: Chester Street East Option B: Chester Street West Conclusion References Appendix A: Drainage Area Schematics Appendix B: Sample Calculations Appendix C: Estimated Projected Costs i

3 Introduction Rummel, Klepper & Kahl, LLP (RKK) was asked to perform a feasibility study searching for possible locations for greening enhancements within the Butchers Hill neighborhood. The Butchers Hill Neighborhood Association is currently developing a master plan and design guidelines for improvements within the neighborhood. The master plan includes improving street parking, greening techniques, traffic calming techniques as well as aesthetic guidelines. RKK was asked to conduct an initial survey of the area using GIS provided information for elevation contours, storm drain, water, and sewer system locations and prioritize four sites within the neighborhood to implement greening techniques as example for the rest of the neighborhood. Neighborhood Description Butchers Hill is located on the east side of Baltimore City, just west of Patterson Park. The neighborhood is bordered by Fayette Street to the north, Pratt Street to the south, Washington Street to the west, and Patterson Park Avenue to the east, see Figure 1. The neighborhood is almost completely residential and comprised of attached row homes. There is one Baltimore City Public School located in the block bounded by Fayette, Fairmount, Washington and Chester Streets. The school consists of several buildings, two parking lots, a basketball court and an amphitheater and lawn section. There is also one small area park located in the center of the block bounded by Fairmount, Baltimore, Washington and Chester Streets. The park is approximately 0.75 acre and Figure 1: Butchers Hill Boundary Map consists of walking paths, green space, and a mulched play ground. There is another small park, the Charles M. Halcott Square, located on South Duncan Street between Lombard and Pratt Streets. This park is approximately 0.1 acre and consists of a paved walking path and planters. Other than the amphitheater lawn and the neighborhood parks, most of the neighborhood is comprised of impervious surfaces. Few houses have grass lawns, most have paved parking pads. The community is known for its tree lined streets. Every major street is lined with trees, however the trees are encased in concrete sidewalks and do not provide room for water storage. Butchers Hill is comprised of several wide, free flowing streets as well as many small and narrow alleys. Each major street also provides street parking for the neighborhood residents and visitors. The wide streets tend to have heavier traffic. Part of the 1

4 Neighborhood Association s Master Plan is to reduce traffic speeds on some of the wider streets by implementing traffic calming measures. Additionally, they may increase available parking by changing some streets to one-way and creating diagonal parking. This also helps in traffic calming. The transforming of two-way streets to one-way streets has already begun in some parts of the neighborhood. The Master Plan also contains guidelines for streetscaping practices such as greening, parking, plantings, and cross walk enhancements. Greening Techniques The Neighborhood Association s Master Plan describes two main techniques that may be used for greening, traffic calming and also water quality control. Corner Curb Bump-outs Corner Curb Bump-outs are small bioretention systems placed at the corner of a block to trap and infiltrate runoff from the adjoining streets. They can be placed at most intersections, however they are at the greatest advantage at streets where there is diagonal parking. This allows more surface area for storage. The bump-out helps to define the limits of available parking, reduces the pedestrian cross walk length and acts as a traffic calming device while capturing and treating street runoff. The bioretention system can take on various shapes around the corner, providing various amounts of water quality treatment. Two different configurations are shown in Figures 2A and 2B, as shown in the Butchers Hill Master Plan. The water is treated in the planting area and the bioretention soils below, infiltrated into an underdrain pipe and released to a nearby storm drain. Figure 2: A) Bioretention on one street, B) Bioretention on both streets For computational purposes, the bump-outs were considered to be around 600-sq ft on average (based off of approximate dimensioning from Master Plan assuming two street bioretention) with 2.5-ft of bioretention material with a permeability factor of 0.5-ft/day. Additionally, a 0.5-ft ponding area and 2 day retention time were assumed. 2

5 Flow Through Planters Flow through planters are a bioretention technique used in urban areas to trap runoff from sidewalks and streets in planter boxes on the sidewalk with trees and other vegetation. Figure 3 shows a photograph of flow through planters shown in the Butchers Hill Master Plan. The planters can be placed the length of a street within the sidewalk. The water is directed to the planter through trench drains and curb cuts and is retained within the soils in the planter. The water then drains to an underdrain which empties into a nearby storm drain. The flow through planters have limited storage area due to the size of the Figure 3: Flow through planters sidewalk and available space. The planters are often placed 1-2ft in from the sidewalk/road edge to allow room for cars to open doors. This often requires increasing the width of the sidewalk by reducing driving space. Streets where diagonal parking will be implemented may be able to add the additional required space for flow through planters. The planters are filled with low vegetation and small trees. The trees currently in the Butchers Hill sidewalks would need to be replaced. For computational purposes, the flow through planters were considered to be 4-ft wide with 2.5-ft of bioretention material with a permeability factor of 0.5-ft/day. Additionally, a 0.5-ft ponding area and 2 day retention time were assumed. Tree Planting Strips Figure 4: Tree planting strip A planting strip is the pervious area between the back edge of the curb and the sidewalk. It can be continuous or segmented and is usually planted with grass and trees. Butchers Hill s streets all contain trees in the outer edge of the sidewalk, near the curb edge. Planting strips would replace the sidewalk surrounding these trees and provide a pervious buffer. The planting strips do not provide any water quality treatment or storage, but would decrease the amount of impervious 3

6 space within the neighborhood. Figure 4 shows a typical tree planting strip along a brick paved sidewalk. The strip provides an aesthetic buffer between the roadway and the sidewalk. The strip also allows for large diameter trees to grow. Site Descriptions RKK was asked to identify four possible sites within the Butchers Hill neighborhood where greening techniques such as those described above could be implemented. Baltimore City provided GIS data for water main, sewer main, and storm drain horizontal locations. Elevation contours were also provided. The sites needed to impact as few utilities as possible and also have a large enough drainage area to sustain the bioretention facility. Four main locations were selected, however each site has a varied level of options within the site to offer more water quality treatment at a higher level of impact. RKK was also asked to develop a set of criteria to prioritize the sites. There are many factors that could go into this category. Three main criteria were used to prioritize the sites. Impacts to utilities Ability to treat available drainage area Percentage of water quality volume treated Ease of implementation Impacts to trees Impacts to sidewalks Impacts to roadways Proximity to outlet storm drain Changes required to storm drain system In general, sites impacting known utilities were not included, or were very low on the prioritization. The sites that were able to provide enough surface area to treat all of their water quality volume were high on the priority list. And those projects that may treat a high percentage of water quality volume but were more difficult to implement were placed lower on the list. Of the four ranked sites, each site has another subset of options for higher or lower level impacts. Each option within the subset is also ranked. The following section gives a description of each greening site. Table 1 gives a summary of each greening option and its ranking. 4

7 Site 1: Collington Avenue between Baltimore and Fairmount Collington Avenue between Baltimore and Fairmount Streets is a wide, one-way street that has already been transformed with back in entry angled parking on the right hand side of the road. The left hand side remains parallel parking. The street is relatively quiet as it is not inline with its connecting streets at either end. The street peaks near the center, dividing the drainage area to half to the Baltimore Street end and half to the Fairmount Street end. Option A: Corner Bump-Out at Baltimore Street Figure 5: Bump-out at Collington and Baltimore As seen in the above photograph, Collinton Ave is already an angled parking street. Baltimore Street remains parallel parking. A curb bump-out at this location would catch drainage coming down Collington Street as well as a small portion coming down Baltimore Street. This location would provide at least two bioretention cells, a third if a parking spot is taken from Baltimore Street. The green shaded area shows a likely location for the bump-out. The grayed areas show the potential sidewalk cuts through the retention area. The bump-outs reduce the length of pedestrian cross walk needed. This site would not be affecting the water or sewer mains. The existing storm drain inlet at the curb would need to be closed, however this provides excellent proximity to outlet drainage to the storm drain system. No adjustments would be required to parking, unless desired. No trees will be impacted. Minimal sidewalk replacement would be necessary. The site provides water quality treatment as well as traffic calming measures and aesthetic interest. 5

8 Option B: Corner Bump-Out at Fairmount Street Figure 6: Bump-out at Collington and Farimount This option would be the higher level of impact addition to Option A for this site. This is the other end of Collington Avenue with the back in entry angled parking on the right hand side of the road. Fairmount Avenue is a two-way street with parallel parking. As described earlier, the drainage area for this street is divided, this facility would receive drainage from the north half of the street and a small amount from Fairmount Ave. The green shaded area shows the bump-out location. This facility also has room for at least two bioretention cells, a third if more space is taken from Farimount Avenue. The gray areas are the sidewalk extensions; the pedestrian cross walk lengths are shortened. This facility is a higher level of impact addition to the Collington Ave site. A sewer main runs down the street and a manhole (seen in picture) would most likely be affected by the bump out. The depth of the sewer main is also unknown and could be impacted. No parking adjustments would be required unless desired. No trees are impacted. The connecting storm drain is on the west side of Collinton Ave, therefore some roadwork would be needed to connect the underdrain to the storm drain system. Minimal sidewalk replacement would be necessary. The site provides water quality treatment as well as traffic calming measures and aesthetic interest, however has some utility impacts and would be more costly and difficult to implement. 6

9 Site 2: Fairmount Avenue at Chester Street Fairmount Avenue west of Chester Street is a one-way street that has already been converted to front entry angled parking on the right hand side of the road. The left hand side remains parallel parking. The sidewalk on the right hand side of the road is fairly wide, approximately 15-ft. Chester Street north of Fairmount Avenue is also a one-way south street. It has also been converted to angled parking on the right hand side, with parallel parking on the left. Option A: Corner Bump-Out at Fairmount Avenue and Chester Street Figure 7: Bump-out at Fairmount and Chester As seen in the above photograph, the intersection of Chester Street (coming from the right) and Farimount Avenue (running into the page) leaves a large area available for curb bump-out bioretention. This area receives runoff from Fairmount Avenue as well as some from Chester Street. The green shaded area above shows room enough for three bioretention cells. Additional sidewalk extensions reduce the cross-walk length. This site has no impact to water or sewer mains. The proximity to a storm drain to outlet to could be an issue. The GIS information is not fully clear at this location. Storm drain inlets are shown in the vicinity, but the connecting drains are not. There are no impacts on parking at this site. Minimal sidewalk replacement would be needed. The bump-out would provide water quality treatment for a portion of the drainage area, traffic calming, and aesthetic interest. 7

10 Option B: Flow Through Planters or Tree Planting Strips Figure 8: Bump-out at Fairmount and Chester with flow through planters Option B-1 is a higher impact addition to the corner curb bump-out bioretention facility described in Option A. The corner bump-out does not provide enough surface area to treat the entire water quality volume for the drainage area. Option B-1 is to increase the treatment area by providing flow through planters along Fairmount Avenue. This increases the drainage area, however the increase in treatment area meets the water quality volume. The flow through planters provide a barrier between the parking area and sidewalk. The sidewalk along Fairmount is fairly wide, approximately 15-ft and in need of replacement. Placement of the flow through boxes would allow for walking room and water quality treatment. An underdrain system would connect to the storm drain system at the bottom of the hill at Washington Street. This option has a high level of impact. The entire sidewalk would require replacement. There are no affects on parking or water or sewer mains. The street is lined with trees that would need to be replaced. It is unlikely that these trees would survive a transplant. The flow through boxes would be replanted with a smaller caliper tree and other vegetation. This option would provide full water quality volume treatment and aesthetic interest. Option B-2 is a lower level of impact addition to the corner bump-out. Instead of flow through planters, tree planting strips could be implemented. Tree planting strips do not provide any water quality treatment, but do decrease the amount of impervious area. The strips could be placed between the existing trees without tree removal. No impacts would be made on parking, water or sewer mains. The sidewalk would not have to be replaced entirely. This option provides aesthetic interest and reduces impervious area. 8

11 Site 3: Collington Avenue between Lombard and Baltimore Streets Collington Avenue is a one-way street running north between Lombard and Baltimore Streets. It has already been converted to back in entry angled parking on the right hand side of the street. The left hand side remains parallel parking. The street runs downhill from Baltimore to Lombard and has a crown splitting the drainage to either side of the street. Option A: Flow Through Planter or Tree Planting Strips Figure 9: Sidewalk enhancements on Collington between Lombard and Baltimore Streets Option A-1 is a high level impact option. Flow through planters along the left hand side of Collington Street would catch and treat the entire water quality volume for this drainage area. The planters could extend all the way up the street or only for a portion, depending on the designers needs. The flow through planters provide a boundary between the parking area and sidewalk. There is the possibility for a sewer main impact at the alley entrances, depending on the depth of the mains. No water mains would be affected. No changes in parking would be required. The street is tree lined. The flow through planters would require replacing the trees. It is unlikely that the existing trees would survive a transplant. The planters would contain trees of a smaller caliper as well as other vegetation. The underdrain would outlet to the storm drain system at the alternate corner of Collington and Lombard Street. Some roadwork would be needed to make the connection. This option provides full water quality treatment as well as aesthetic interest. Option A-2 is a low impact alternative to A-1. Instead of flow through planters, the street could be lined with tree planting strips. The strips would replace the existing concrete sidewalk and reduce the amount of impervious area. The planting strips do not provide water quality treatment. The strips have no impact on parking, water or sewer mains, roads and could be placed as to not affect the existing trees. The tree planting strips provide aesthetic interest and reduce impervious area. 9

12 Option B: Corner Bump-Out at Collington and Lombard Figure 10: Bump out at Collington and Lombard Street Option B is a high impact addition to Option A. Option B provides water quality treatment for the opposite half of Collington Avenue s drainage area. Collington Avenue is already a back in entry angled parking street and due to the existing fire hydrant, has a large open space at the corner of Lombard Street. This area could be made into a two cell bioretention facility, three if it extends to Lombard Street. The GIS information indicates that there are few storm drain inlets to the east of this intersection; therefore the drainage area for this site is quite large, near 1.5 acres. It is possible that the site could be inundated during large flow events. The site will only be able to treat a portion of the water quality volume for the drainage area. The sidewalk extension decreases the cross-walk length. The site does have utility conflicts. The existing fire hydrant would most likely need relocating, probably to the Lombard Street side. There are also several storm drain pipes and an inlet at this corner, which provides easy access to outletting the underdrain, but depending on the depth and location of the structures, there may be impacts. No parking impacts would be made, minimal sidewalk replacement is necessary and minimal road repair would be necessary. The site provides partial water quality treatment, traffic calming measures, and aesthetic interest. 10

13 Site 4: Chester Street between Lombard and Pratt Streets Chester Street between Lombard and Pratt Streets is still a two-way street with parallel parking. Other sections of Chester Street have been altered to one-way with angled parking, however this section remains. Chester Street is also very wide, approximately 44-ft across with approximately 14-ft sidewalks on both sides. The street is crowned dividing the drainage area. The drainage area to the west is approximately twice the size of the drainage area to the east. Option A: Chester Street East According to the GIS contours, the drainage area to the east half of Chester Street is a much more manageable size than to the west. Both Option A and B suggest the transforming of Chester Street into a one-way street running south with head in angled parking on the right hand (west) side of the road. The left hand (east) side will remain parallel parking. This adjustment will increase the amount of parking provided for the block. It will also reduce the amount of travel lane space needed and if necessary allow for a slight increase in sidewalk space. The complete adjustment of the street allows for a large number of spatial arrangements for the site. However, the low level sub-options (Options A-1, A-2, B-1, B-2) do not necessarily require the alteration of the street design. Figure 11: Sidewalk enhancement on east side of Chester between Lombard and Pratt Option A-1 is the lowest level option for this site. Tree planter strips could be added to the sidewalk between the existing tree boxes. This option provides no water quality treatment, but does reduce impervious area. This option does not require the road and parking to be readjusted. There are no impacts to parking, water or sewer mains. The existing trees could be left in place. 11

14 Option A-2 is the mid-range option for this site. Flow through planters could be place along the east sidewalk. These planters would trap and treat a portion of the water quality volume for this site. The underdrain has easy access to the storm drain system at the south end of Chester Street and Lombard. There is a sewer main crossing at Lombard-Pratt Alley, however, impacts are dependent on the depth of the structure. This option does not require readjustment of the street design, but is benefitted by it. A street redesign could increase the sidewalk width allowing for a 1-2ft buffer between the curb and the planter box allowing for car door openings. Street runoff would reach the planters through trench drains. This option does not impact parking or water mains. Sidewalk reconstruction is required, road reconstruction is minimal. The street is tree lined. The existing trees would need to be replaced. It is unlikely that the trees would survive a transplant. The flow through planters would be planted with smaller caliper trees and other vegetation. This option provides water quality treatment and aesthetic interest. Figure 12: Corner bump-out on east side of Chester between Lombard and Pratt Option A-3 is the highest impact option for this site. This option requires the adjustment of the street design to one-way as described above. This option is in addition to Option A-1 or A-2 to add increase water quality treatment. The east side of the roadway would be parallel parking. A corner bump-out would be placed at the corner of Chester and Pratt Streets. The parallel parking restricts the size of the bioretention area and so the bump-out and flow through planters will still only be able to treat a portion of the water quality volume for the drainage area. There are several storm drain inlets and pipes at the south end of the street that may be impacted by the bioretention area, however provides easy access for the underdrain. There is also a sewer main that could be affected. The bump-out requires taking at least one parallel parking space from Chester Street and possibly one from Pratt Street. This option requires sidewalk replacement and some road repair. The flow through planters require replacement of the trees as described above. This option provides partial water quality treatment, traffic calming measures, increased parking space and aesthetic interest. 12

15 Option B: Chester Street West The Chester Street West drainage area is approximately 1.4 acres. This provides significant amount of flow through any bioretention facility. It is possible that the treatment area would be inundated during high flow events. The Chester Street West options are similar to the Chester Street East options, just with a different drainage area, and if road redesign option is followed, increased space due to the angled parking. Figure 13: Sidewalk enhancement on west side of Chester between Lombard and Pratt Option B-1 is the lowest level option for this site. Tree planter strips could be added to the sidewalk between the existing tree boxes. All impacts and benefits are the same as Option A-1. Option B-2 is the mid-range option for this site. Flow through planters could be placed along the west sidewalk. All impacts and benefits are the same as Option A-2. Figure 14: Corner bump-out on west side of Chester between Lombard and Pratt 13

16 Option B-3 is the high impact option for this site. This option requires the adjustment of the street design to one-way as described above. This option is in addition to Option B-1 or B-2 to add increased water quality treatment. The west side of the roadway would be head in entry angled parking. A corner bump-out would be placed at the corner of Chester and Pratt Streets. The angled parking allows for greater surface area for the bioretention facility. The angled parking increases the number of parking spaces, therefore taking additional room for the bioretention facility will not impact the overall number of parking spaces. The bump-out facility in conjunction with the flow through planters still only treat a portion of the water quality volume for this drainage area. There are several storm drain inlets and pipes at the west corner of Chester and Pratt Streets, allowing for easy access for the underdrain, but potentially receiving impacts from the bioretention facility placement. There is also an existing fire hydrant on Chester Street that would probably require relocating. There is also a sewer main that may be affected depending on the location. This option requires the road design be reconfigured, requires sidewalk replacement and minimal road work. The flow through planters will require tree replacement as described above. This option provides partial water quality treatment, traffic calming measures, increased parking space and aesthetic interest. Figure 15: Both east and west Chester Street corner bump-outs with assumed roadway redesign. 14

17 Conclusion The Butchers Hill Neighborhood Association s Master Plan looks for a variety of ways to increase green space within the neighborhood. There are a number of ways greening can also include water quality treatment as a benefit for all. This report focused on four main sites within Butchers Hill with low, medium and high levels of impact and expense at each site for greening and water quality treatment. The following table summarizes the four sites and ranks them according to the qualities described earlier. Avoiding utility impacts was a high level of importance. Additional recognizance may be needed at each site to determine depth of structures and the location of the other utilities not available such as gas and cable lines. The volumes and areas specified within the report are approximate and based off of available GIS data. Computations were conducted assuming 100% imperviousness for the drainage areas and the approximate bioretention coefficients discussed previously. All computations follow the procedures described in the Maryland Stormwater Manual Design parameters may vary and allowable surface area may be subject to change. However, this report gives an idea as to the feasibility to this type of greening and water quality features within the Butchers Hill neighborhood. 15

18 Table 1: Site comparison for Butchers Hill greening projects Rank Site 1A Collington/Baltimore Corner Bumpout Bioretention % NO NO SOME CLOSE SD Drainage Area (acres) Water Quality Volume (ft 3 ) Facility Type Surface Area Required (ft 2 ) Available Treatment Area (ft 2 ) Percent WQv Treated Requires Parking Change Requires Tree Replacement Requires Sidewalk Replacement Possible Utility Impacts 1B 2A Collington/Fairmount Corner Bumpout Fairmount/Chester Corner Bumpout Bioretention % NO NO SOME POSSIBLE Bioretention % NO NO SOME NONE 2B 3A 3B 4A 4B Fairmount 1) Flow-Thru Planters Bioretention % NO YES YES NONE 2) Grass Strips Aesthetic % NO NO NO NONE Collington 1) Flow-Thru Planters Bioretention % NO YES YES NONE 2) Grass Strips Aesthetic % NO NO NO NONE Collington/Lombard Corner Bumpout Bioretention % NO NO SOME YES Chester East 1) Grass Strips Aesthetic % NO NO NO NONE 2) Flow-Thru Planters Bioretention % NO YES YES NONE 3) Flow-Thru Planters w/ Corner Bumpouts Bioretention % YES YES YES YES Chester West 1) Grass Strips Aesthetic % NO NO NO NONE 2) Flow-Thru Planters Bioretention % NO YES YES NONE 3) Flow-Thru Planters w/ Corner Bumpouts Bioretention % YES YES YES YES 16

19 References Neighborhood Design Center/Design Collective, Inc Butchers Hill Master Plan & Design Guidelines. Butchers Hill Neighborhood Association. Baltimore, Maryland. MDE, Maryland Stormwater Design Manual Volumes I & II. Water Management Administration. Baltimore, Maryland. City of Portland Stormwater Management Manual, Revision 3. Environmental Services, City of Portland. Portland, Oregon.

20 Appendix A Drainage Area Schematics

21 S COLLINGTON AVE N COLLINGTON AVE E FAIRMOUNT AVE Water Structure Vegetation Contour-2ft E BALTIMORE ST Legend N MADEIRA ST Water Main Storm Drain Inlet Storm Drain Manhole Storm Drain 120 Sewer Structure Sewer Main Contour-10ft Potential Sites Drainage Areas 120 BUTCHERS HILL GREENING FEASIBILITY 1 inch equals 60 feet SITE 1 - COLLINGTON AVE Date: May 2009

22 LAMLEY ST N DUNCAN ST 130 N WASHINGTON ST 100 FAIRMOUNT-BALTIMORE WASHINGTON-CHESTER BUTCHERS HILL GREENING FEASIBILITY E FAIRMOUNT AVE 120 N CASTLE ST 1 inch equals 70 feet SITE 2 - FAIRMOUNT AVE Date: May N CHESTER ST Water Structure Water Main Storm Drain Sewer Structure 130 Legend MOYER ST Contour-2ft Storm Drain Inlet Storm Drain Manhole Sewer Main Vegetation 130 MOYER-BALTIMORE Contour-10ft Potential Sites Drainage Areas

23 E BALTIMORE ST 120 BOYER ST 110 S COLLINGTON AVE BOYER-LOMBARD BUTCHERS HILL GREENING FEASIBILITY S BOYER-LOMBARD E LOMBARD ST S MADEIRA ST S MADEIRA ST 1 inch equals 70 feet SITE 3 - COLLINGTON AVE Date: May S PATTERSON PARK AVE Legend Water Structure Water Main Storm Drain Inlet Storm Drain Manhole Storm Drain Sewer Structure Sewer Main Vegetation Contour-2ft Contour-10ft Potential Sites Drainage Areas

24 110 E LOMBARD ST 100 LOMBARD-ALLEY-PRATT S CHESTER ST LOMBARD-PRATT ALLEY-LOMBARD-PRATT Legend S CASTLE ST PRATT-GOUGH BUTCHERS HILL GREENING FEASIBILITY Water Structure Water Main Storm Drain Inlet E PRATT ST Storm Drain Manhole Storm Drain Sewer Structure Sewer Main Vegetation Contour-2ft Contour-10ft PRATT-GOUGH Potential Sites Drainage Areas 1 inch equals 60 feet SITE 4 - CHESTER STREET Date: May 2009 S DUNCAN ST

25 Appendix B Sample Calculations

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31 Appendix C Estimated Projected Costs

32 ESTIMATED PROJECTED COSTS Rank Site Size Unit Price Unit Cost Collington/Baltimore Corner Bumpout Site Size = 600 SF Asphalt/Concrete Removal CY 2,680 1A Bioretention (Veg, Soils, Drain) SF 9,000 Pervious Sidewalk Pavers SF 600 Replacement Curbs LF 1,500 Replacement Pavement SY ,080 = 211 /SY 1B 2A 2B Collington/Fairmount Corner Bumpout Site Size = 600 SF Asphalt/Concrete Removal CY 2,680 Bioretention (Veg, Soils, Drain) SF 9,000 Pervious Sidewalk Pavers SF 600 Replacement Curbs LF 1,500 Replacement Pavement SY ,080 = 211 /SY Fairmount/Chester Corner Bumpout Site Size = 900 SF Asphalt/Concrete Removal CY 4,000 Bioretention (Veg, Soils, Drain) SF 13,500 Pervious Sidewalk Pavers SF 1,000 Replacement Curbs LF 3,000 Replacement Pavement SY ,950 = 220 /SY Fairmount 1) Flow-Thru Planters Site Size = 800 SF Asphalt/Concrete Removal CY 3,200 Bioretention (Veg, Soils, Drain) SF 12,000 Pervious Sidewalk Pavers 0 10 SF 0 Replacement Curbs LF 4,000 Replacement Pavement SY ,800 = 223 /SY 2) Grass Strips Site Size = 1,600 SF Sidewalk Removal CY 3,600 Top Soil, Seed, Mulch SY 630 4,230 = 24 /SY

33 Rank Site Size Unit Price Unit Cost Collington 1) Flow-Thru Planters Site Size = 690 SF Asphalt/Concrete Removal CY 3,080 Bioretention (Veg, Soils, Drain) SF 10,350 Pervious Sidewalk Pavers 0 10 SF 0 Replacement Curbs LF 3,000 3A Replacement Pavement SY ,030 = 222 /SY 2) Grass Strips Site Size = 1,000 SF Sidewalk Removal CY 2,000 Top Soil, Seed, Mulch SY 350 2,350 = 24 /SY 3B Collington/Lombard Corner Bumpout Site Size = 800 SF Asphalt/Concrete Removal CY 3,520 Bioretention (Veg, Soils, Drain) SF 12,000 Pervious Sidewalk Pavers SF 1,000 Replacement Curbs LF 2,250 Replacement Pavement SY ,220 = 216 /SY Chester East 1) Grass Strips Site Size = 1,280 SF Sidewalk Removal CY 2,800 Top Soil, Seed, Mulch SY 490 3,290 = 24 /SY 4A 2) Flow-Thru Planters Site Size = 1,280 SF Asphalt/Concrete Removal CY 5,600 Bioretention (Veg, Soils, Drain) SF 19,200 Pervious Sidewalk Pavers 0 10 SF 0 Replacement Curbs LF 7,000 Replacement Pavement SY 1,500 33,300 = 234 /SY 3) Flow-Thru Planters w/ Corner Bumpouts Site Size = 1,580 SF Asphalt/Concrete Removal CY 7,000 Bioretention (Veg, Soils, Drain) SF 23,700 Pervious Sidewalk Pavers SF 800 Replacement Curbs LF 8,000 Replacement Pavement SY 3,000 42,500 = 242 /SY

34 Rank Site Size Unit Price Unit Cost Chester West 1) Grass Strips Site Size = 1,300 SF Sidewalk Removal CY 2,900 Top Soil, Seed, Mulch SY 508 3,408 = 24 /SY 4B 2) Flow-Thru Planters Site Size = 1,300 SF Asphalt/Concrete Removal CY 5,800 Bioretention (Veg, Soils, Drain) SF 19,500 Pervious Sidewalk Pavers 0 10 SF 0 Replacement Curbs LF 7,000 Replacement Pavement SY 1,500 33,800 = 234 /SY 3) Flow-Thru Planters w/ Corner Bumpouts Site Size = 1,800 SF Asphalt/Concrete Removal CY 8,000 Bioretention (Veg, Soils, Drain) SF 27,000 Pervious Sidewalk Pavers SF 800 Replacement Curbs LF 10,000 Replacement Pavement SY 3,000 48,800 = 244 /SY These costs are approximate and for installation only. Costs exclude design and engineering fees and operation and maintenance fees.