Some suburban or rural municipalities have subdivision and land development ordinances requiring hydrogeological investigations, where public water supply is not available, for subdivisions with more than a certain number of lots and/or with projected water demand above a certain number of gallons per day. While the language of the ordinances may differ, the intent is the same.
The ordinances intend to one, show that the proposed subdivision has the groundwater resources to supply the projected peak daily demand; two, show that the groundwater quality meets drinking water standards; and three, show that extracting the groundwater for the subdivision will not interfere with existing users.
As an example, a suburban township has an ordinance that requires a hydrogeological investigation for subdivisions of three or more lots or where the on-site water supply will pump one thousand gallons or more per day. The ordinance requires that the hydrogeological investigation consist of: notifying residents within one-half mile of the proposed subdivision that an investigation will be conducted, conduct a residential well survey to identify the locations of water supply wells in the vicinity of the subdivision, drill a test well capable of providing the peak daily water demand for the entire subdivision, drill one observation well for every ten acres of the subdivision, conduct a 48-hour continuous rate pumping test in the test well and monitor water levels in the observation wells and surrounding residential wells.
A 30-acre farm was proposed for subdivision so that two residences could be built in addition to the existing farm house. Because the subdivision would be three lots, it had to address the requirements of the township ordinance which would be onerous for the land owner. Early discussions with the township's hydrogeologist resulted in variances that met the intent of the ordinance without strict adherence to the requirements. For instance, the existing farm well and the water supply wells for the proposed lots were used as the test well and observation wells. A variance was granted to reduce the pumping test time from 48 to 12 hours in recognition that individual residential wells do not pump continuously for long periods as do community public water supply wells for which the ordinance was intended.
So, to avoid "planning to fail," establish early contact with the regulator to discuss the project and ensure a timely and cost effective outcome.
Joseph Tomalavage, P.G. is a hydrogeologist, registered
professional geologist in several states and project manager with Malarkey Consulting, Inc. in Pottstown, Penn.
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