![]() Varying the pumping rate may diminish the usefulness of early-time data. Therefore, major changes in pumping rate must not occur as part of a 72-hour constant rate pumping test unless prior agreement with DEC is obtained. Any deviation from this philosophy must be discussed with DEC prior to carrying out the test. Test Pumping Rate - DEC's expectation is that a constant pumping rate will be a fundamental part of the test design.Pumping tests for rock wells or confined sand and/or gravel wells not significantly influenced by overlying unconsolidated ground or surface water may be conducted during any month of the year, however the applicant must demonstrate that the test well(s) will not be affected by spring recharge. Tests conducted during the winter must not be affected by snow melt. Typically, this eliminates the months of March, April, and May. Time of Year - The pumping test of unconfined sand and/or gravel aquifer wells must be conducted during a time of average or below average seasonal stream flow conditions that is, when "normal" groundwater gradients have not been reversed or significantly altered.Other factors to consider when siting a project include flood plain location, agricultural districts, conceptual wellhead protection/recharge areas, existing or potential groundwater contamination sources, and existing subsurface utility corridors whose location could provide a preferential path for groundwater flow or contamination. IMPORTANT NOTE: Before starting construction, it is advisable to submit a location map of the proposed new wells and any related construction to the Division of Environmental Permits in the appropriate DEC Regional Office for a determination for whether that construction requires any other DEC permits, such as for disturbance of protected streams, protected freshwater wetlands, or for storm water runoff from a construction site. The requirements that follow have been designed to produce accurate and complete information vital to these determinations and whether modifications to the application or conditions in a potential permit are required.Īpplicants are advised to submit their pumping test plans to DEC prior to conducting a pumping test if the proposed test will deviate from these procedures in a substantive way. In reviewing any such application, DEC must determine if the proposed well(s) will adequately meet the needs of the applicant and if others who may rely on the same aquifer will be adversely affected. Pumping Test Procedures for Water Withdrawal Permit ApplicationsĭEC regulations (leaves DEC website) require that pumping test results be submitted with any Water Withdrawal Application for new or additional groundwater sources, or reassessment of previously permitted wells.
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