Newtown Creek Funding Opportunity Site:Laguardia Community College

Parking Lot Redesign Proposal

Project Overview

• Scope:– Redesign Laguardia Community College’s parking

lots 2 & 3 (19,000 sf) in accordance with NYSDEC Stormwater BMPs.

• Primary Goals:– Minimize the discharge of pollutants into

Newtown Creek.– Maintain downstream habitat.

Newtown Creek Watershed

Site Context

Laguardia Community College Campus Map

Parking Lot 2 Existing Conditions

Parking Lot 2 Existing Conditions

Parking Lot 2 Existing Conditions

Parking Lot 3 Existing Conditions

Parking Lot 3 Existing Conditions

Stormwater Runoff, Combined Sewer Systems, and Newtown Creek

• Stormwater runoff & combined sewer systems at Newtown Creek:– devastates the ecosystem, – severely affects the economic value of adjacent

waterway properties, – reduces usage of waterways for recreation or fishing

purposes, and– poses direct and indirect health hazards.

• Cleaning up Newtown Creek is expected to cost more than $500M.

Design Opportunities

Reduce stormwater runoff by:• Converting impermeable surfaces to

permeable paving,• Including tree planters, and• Implementing stormwater BMPs such as curb

cuts and bioretention swales to direct stormwater to planting areas

Existing & Proposed Stormwater Runoff Analysis

Existing Site

Redesign Proposal

Lot 2 – Existing Site

Lot 2 – Existing Drainage

Lot 2 – Proposed Design

Lot 2 – Proposed Drainage

Lot 3 – Existing Site

Lot 3 – Existing Drainage

Lot 3 – Proposed Design

Lot 3 – Proposed Drainage

Bioretention BMPs adapted from:New York State Design Manual

Bioretention BMPs adapted from:New York State Design Manual

Example Parking Lot Design from:New York State Design Manual

Project Benefits• Reduced Flood Control: keeping runoff close to the source and

preventing sediment loading prevents streams from being overburdened with excess water during rain events that can cause flooding and severe erosion downstream.

• Increased property value and tax revenue.• Reduced infrastructure requirements and development and

maintenance costs.• Placing water quality practices onsite enhances public awareness of

water quality issues and can lead to overall improvement in its quality of life.

• Enhances opportunities for regional economic development through thoughtful design and planning.

• Improved habitat.

Project Benefits

• Regulatory compliance credits, easier permit processes, lower impact fees, and further incentives.

• Tax credits: may be eligible for state energy tax deduction ($7.50 per sf, a total of $142,500/yr)

• Improved groundwater recharge and drinking water and decreased treatment costs.

Project Benefits

Appendix: CalculationsStormwater Runoff CalculationsExisting Runoff from Lots 2 & 3 (gallons/year) 497,241Proposed Runoff from Lots 2 & 3 (gallons / year) 183,194Net Proposed Captured Water for Lots 2 & 3 (gallons/year) 314,047 USEPA, 2004Combined sewer outfalls in New York City flood during half of all rainstorms, discharging approximately 27 billion gallons of wastewater in an average rainfall year. From NYCDEP Publication: New York City’s Wastewater Treatment Systemwww.nyc.gov/html/dep/pdf/wwsystem.pdfDEP devised a three-pronged approach – an immediate, an interim, and a longterm program – to administer 1,200 wet tons of sludge produced each day. ($670M) - The first facility went on line in December 1991. The other seven were finished and became operational by June 1992.$100M/YR, ($500M) - Three contractors were hired through five-year contracts to provide land-based biosolids management. The contractors were responsible for the processing, production and shipment of biosolids as high-quality

soil amendments and the application thereof.$50M/YR, ($750M) - The long-term program currently costs, and includes three 15-year contracts that were let for the city’s entire biosolids production through June 2013.Total Costs from 1991-2013 for Sewage Treatment: $1.92 BillionCost per year for Sewage Treatment: $83.5MCost per day for Sewage Treatment: $.23M NYCDEP / Riverkeeper, 2005bhttp://www.nyc.gov/html/dep/html/harbor_water/northri.shtmlNew York City's plants treat about 1.4 billion gallons of wastewater from homes, businesses, schools, and streets in the five boroughs every day (NYCDEP).The total dry weather capacity of New York City’s sewage treatment plants is 1.8 billion gallons per day (Riverkeeper, 2005b).NY Times Superfund Cleanup Costs Articlehttp://www.nytimes.com/gwire/2011/03/21/21greenwire-epa-nyc-brace-for-grueling-cleanups-of-2-indus-31604.html?pagewanted=allScrubbing more than 150 years of industrial pollution in the Gowanus could cost up to $500 million, with Newtown Creek -- which is more industrialized and a mile-and-a-half longer than the Gowanus -- expected to cost still more. Cost per gallon of sewage treatment in NYC: $.23M/1400M gallons = $164/gallon$.23M/1,800M gallons = $128/gallon(164+128)/2 =AVG $146/gallon Assuming the proposed design will reduce the amount of stormwater runoff from the site by 314,047 gallons, the amount of annual savings in terms of water treatment costs are:314,047 gallons/year x $146/gallon = $46M/yearPollution Externalities: devastate the ecosystem, severely affect economic value of adjacent waterway properties, reduce usage of waterways for recreation or fishing, pose direct (direct contact) or indirect (through

consumption) health hazards.Scrubbing more than 150 years of industrial pollution from Newtown Creek is expected to cost more than $500M.

Appendix: CalculationsYearly Runoff Comparison

Runoff Equation

Q=cia (discharge=runoff coefficient x rainfall inches x area)

Runoff Coefficients

0.95Impervious Asphault/Concrete

0.35Permeable Pavement

existing surface parking lot impervious areas

parking lot sq ft acres

lot 2 6846 0.157458

lot 3 12144 0.279312

Total Lot Area 18990 0.43677

Yearly Avg Runoff Comparison

Year Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec.

in. 47.25 3.42 3.27 4.08 4.20 4.42 3.67 4.35 4.01 3.89 3.56 4.47 3.91

ft 3.94 0.29 0.27 0.34 0.35 0.37 0.31 0.36 0.33 0.32 0.30 0.37 0.33

Existing Runoff (in.) 852413.625 61698.51 58992.44 73605.24 75770.1 79739.01 66208.64 78476.18 72342.41 70177.55 64224.18 80641.04 70538.36

Proposed Runoff (in.) 314047.125 22731.03 21734.06 27117.72 27915.3 29377.53 24392.66 28912.28 26652.47 25854.89 23661.54 29709.86 25987.82

Existing Runoff (cu. ft.) 71034.4688 5141.543 4916.036 6133.77 6314.175 6644.918 5517.386 6539.681 6028.534 5848.129 5352.015 6720.086 5878.196

Proposed Runoff (cu. ft.) 26170.5938 1894.253 1811.171 2259.81 2326.275 2448.128 2032.721 2409.356 2221.039 2154.574 1971.795 2475.821 2165.651

Existing Runoff (gallons) 497241.281 35990.8 34412.25 42936.39 44199.23 46514.42 38621.7 45777.77 42199.74 40936.9 37464.11 47040.6 41147.37

Proposed Runoff (gallons) 183194.156 13259.77 12678.2 15818.67 16283.93 17136.89 14229.05 16865.49 15547.27 15082.02 13802.57 17330.75 15159.56

THOUSAND GALLONS:

Existing Avg Runoff (Impervious Asphault/Concrete) 497.241281 35.9908 34.41225 42.93639 44.19923 46.51442 38.6217 45.77777 42.19974 40.9369 37.46411 47.0406 41.14737

Proposed Avg Runoff (Permeable Pavement) 183.194156 13.25977 12.6782 15.81867 16.28393 17.13689 14.22905 16.86549 15.54727 15.08202 13.80257 17.33075 15.15956