For all proposed uses in the WPO District, the applicant must demonstrate a system of stormwater management and treatment that results in the site's post-development annual stormwater recharge volume to groundwater to at least the site's pre-development annual groundwater recharge volume. Such a system shall also: preserve hydrologic conditions that maintain or replicate pre-development conditions, maintain or replicate the pre-development hydrologic functions of storage, infiltration, and groundwater recharge; prevent untreated discharges; reduce or prevent flooding by managing the peak discharges and volumes of runoff; minimize erosion and sedimentation; prevent degradation of water by reducing suspended solids and other pollutants; and provide increased protection of sensitive natural resources.

In the WPO District, the minimum size for lots served by private sewage disposal systems (i.e., septic systems) shall be three acres.

In areas serviced by public sanitary sewer, the minimum size for lots in the WPO District shall be that for the underlying zoning district or applicable special area regulations for an overlay district.

A stormwater pollution prevention plan (SWPPP) must be submitted to the Planning Board for any proposed use in the WPO District, except for farm operations located within a county-adopted, state-certified Agricultural District (unless required under applicable New York State Department of Environmental Conservation law or regulation). This plan will detail the site's stormwater management and treatment system, including the design and operational details that will:

The SWPPP must meet applicable stormwater quality/quantity sizing criteria as well as performance criteria that are outlined in the latest New York State Stormwater Management Design Manual. The SWPPP shall also contain sufficient information for the Town to evaluate the plan with respect to additional post-development stormwater management criteria (see below). The SWPPP must be prepared and certified by a New York State licensed professional engineer or landscape architect, or a certified professional in erosion and sediment control (CPESC).

Groundwater recharge. The annual recharge from the post-development site must equal or exceed the annual recharge from the pre-development (existing) site conditions based upon soil types.

Recharge volume. The prescribed design volume of stormwater to be recharged on the site (the so-called "groundwater recharge volume, Re_v") shall be determined by the method that is contained in Appendix C of the 2007 document entitled "Wellhead Protection Plan for the Village of Cazenovia Water Supply," prepared by the New York Rural Water Association (and as that document may be amended from time to time). A copy of this document is filed with the Town Clerk or available through the Town's consulting engineer. Different recharge values for soils may be used, provided that on-site soil evaluations have been conducted and a professional geologist clearly demonstrates that the recharge rate differs from the listed values based upon soils, precipitation, and evapotranspiration.

Hydrologic conditions. The hydrologic conditions of the developed site must maintain or replicate pre-development conditions through adequate use of design techniques that infiltrate, filter, store, evaporate, and detain runoff close to its source.

Sensitive areas. Stormwater discharges to groundwater shall not occur within a distance of 800 feet of any public water supply well operated by the Town or Village of Cazenovia.

Pretreatment. Stormwater runoff shall be directed to a pretreatment device(s) such as water quality inlets, sediment traps, drainage channels, water quality swales, etc. to help trap coarse materials before they enter the primary stormwater management and treatment practice(s).

Emergency design measures. Stormwater management and treatment systems should incorporate designs which allow for shutdown and containment in the event of an emergency spill or other unexpected contamination event.

Operation and maintenance plan. All stormwater management and treatment systems must have an operation and maintenance plan to ensure that the systems function as designed. Such a plan should include details on how post-construction inspection and long-term maintenance is to be carried out.

Performance bond and agreement. In order to ensure that funds are available to finish the construction and ensure the proper functioning of a stormwater management and treatment system(s), the Town shall require the developer or contractor to provide, prior to construction, a performance bond, escrow account certification, or irrevocable letter of credit from an appropriate financial or surety institution which guarantees satisfactory completion of the project and names the Town as the beneficiary. The security shall be in an amount to be determined by the reviewing board based on submission of final design plans in the SWPPP, and an evaluation of projected construction costs by the Town Engineer. A written agreement shall be entered into by the applicant and the Town outlining the responsibilities of each party.

Maintenance bond and agreement. Where stormwater management and treatment systems are to be operated and maintained by the developer or by the owner of the property, the developer or owner, prior to final approval of construction, shall be required to provide the Town with a maintenance bond, escrow account certification, or irrevocable letter of credit from an appropriate financial or surety institution to ensure proper operation and maintenance of all stormwater management and treatment systems for a twenty-year period. The estimated maintenance cost for the facilities shall be based on a reasonable estimate provided by the Town Engineer and adopted by the Town Board. The maintenance bond shall guarantee the stormwater facilities against design defects and/or failures in workmanship, and shall guarantee that the facilities constructed under the permit will be regularly and adequately maintained throughout the maintenance period. If the developer or owner fails to properly operate and maintain the stormwater management and treatment system(s), the Town may draw upon the account to cover the costs of proper operation and maintenance. A written agreement shall be entered into by the applicant and the Town outlining the responsibilities of each party.

Location of the proposed use or activity in relation to the WPO District boundaries.

Location and extent of existing (pre-development) and post-development impervious surfaces.

Details regarding the proposed conveyance, storage, distribution, generation, handling, use, and/or treatment of any sewage, process wastes, aqueous-carried wastes, petroleum, hazardous substances, hazardous waste, solid waste, radioactive material, and/or incidental wastes. Include the estimated types and quantities of such materials to be located on-site.

A SWPPP prepared in accordance with § 165-47.

A description of all pollution control measures and activities proposed to prevent on-site disposal and potential contamination of groundwater or surface water, including spill response activities.

A statement as to the degree of threat to groundwater and surface water quality that could result if the control measures failed.

A description of the provisions for the off-site disposal of any solid waste, petroleum, radioactive material, hazardous substances, hazardous waste, process wastes, and/or aqueous-carried waste (except sewage).

If an on-site water supply is to be utilized, provide a description of the proposed means of water supply, including, if applicable, an estimate of the total daily groundwater withdrawal rate.

Other information as necessary to fully explain the project and evaluate its potential impact upon the Town and Village of Cazenovia's public water supply.

Adequacy of the SWPPP in meeting criteria established in the New York Stormwater Management Design Manual as well as additional post-development stormwater management criteria identified in § 165-47.

Adequacy of proposed control measures to prevent the on-site disposal of solid waste, pathological or medical waste, petroleum, radioactive material, hazardous substances, hazardous waste, or process waste, including aqueous-carried waste.

Adequacy of the provisions for off-site disposal of solid waste, hazardous waste, process waste, and other wastes generated.

The degree of threat to public water supply wells in the event that contamination control measures or devices at the site should fail.

Adequacy of spill response and containment plans to minimize groundwater or surface water contamination.

Adequacy of plans and resources to properly construct and regularly maintain contamination control devices.

The proposed use and site plan comply with all regulations applicable to the WPO District.

The proposed use and site plan will not adversely impact the pre-development hydrologic functions of the site, including the preexisting volume of annual groundwater recharged at the site, the quantity and direction of preexisting drainage eventually draining to the zone of contribution, etc.

The proposed use will not adversely impact upon the preexisting quality of groundwater or surface water leaving the site's boundaries.

The proposed use is to be located, developed, and maintained in such a manner as to not adversely impact the long-term quantity or quality of groundwater available to public water supply wells operated by the Town and/or Village of Cazenovia.