13.25.060 Temporary construction dewatering feasibility study.
A. A Temporary Dewatering Feasibility Study is required for all construction projects that require temporary construction dewatering and for which it cannot be demonstrated that groundwater will be captured, pumped, or removed from the development site at a rate of less than 500 gallons per minute. A Temporary Construction Dewatering Feasibility Study shall be submitted prior to construction as part of site planning and entitlement review processes. This feasibility study shall consist of a site specific hydrogeological and engineering analysis which details the potential dewatering-related impacts to the City water supply wells, to storm water conveyance and treatment systems, and on the potential movement of underground contaminants.
B. The feasibility study shall:
1. Include analysis of geotechnical project, and water quality considerations detailed in the Temporary Construction Dewatering Operating Policy adopted by the City’s Technical Committee;
2. Be conducted using the procedures and methodologies identified in the Temporary Construction Dewatering Operating Policy adopted by the City’s Technical Committee; and
3. Include a site-specific assessment of potential contamination, and identify any known contaminated sites located within the proposed TCD’s radius of influence.
C. The City of Redmond shall review Temporary Construction Dewatering Feasibility Studies completed in accordance with the Temporary Construction Dewatering Operating Policy to determine if the City will allow proposed TCD activities to occur at a development project site. The City of Redmond retains the authority to condition, deny, or allow TCD activities at development projects based on this review.
D. Development Projects who have adequately identified and demonstrated that potential impacts to:
1. City water supply wells,
2. The City’s storm water conveyance system,
3. Repealed by Ord. 2957,
4. Public or private storm water runoff treatment systems, and
5. The movement of contaminants across property boundaries and/or toward city water supply wells, or the acceleration of such movement where the same already exists are negligible or can be mitigated, will be allowed to conduct TCD contingent upon the successful completion of a Temporary Construction Dewatering Plan. (Ord. 2957 § 7 (part), 2019: Ord. 2831 § 2 (part), 2016).