14.36.140 Hydrogeological reports.
A. The city shall require a hydrogeological report for a project located in a wellhead protection area or Category I or II critical aquifer recharge area if:
1. There is insufficient hydrogeological information to perform an adequate review to assure aquifer protection; or
2. The project is likely to possess, store, use, transport, or dispose of hazardous materials.
B. This report shall be prepared, signed, and dated by a professional who is licensed in the state of Washington in hydrogeology or geology.
C. The report shall identify and characterize the aquifer recharge area as it relates to the development site, assess impacts of the development proposal on the aquifer protection and assess the impacts of any alteration proposed for the aquifer recharge or wellhead protection area.
D. The report shall propose adequate protection mechanisms and include mitigation, maintenance and monitoring plans and financial security measures if appropriate.
E. The hydrogeological report shall contain the information required under LMC 14.36.100, and the following:
1. Information sources;
2. Site geology and hydrostratigraphy, supported by project-specific borings and data from other nearby wells;
3. Available data on wells and springs located within one-quarter mile of the site;
4. Location and depth of perched water tables;
5. Groundwater elevations, flow direction, and gradient;
6. Recharge potential of facility site, including aquifer permeability and transmissivity;
7. Background water quality;
8. Identification of all hazardous materials to be used or stored on the site;
9. Analysis of the increase or change in nitrate concentrations predicted to occur in groundwater beneath the site as a result of the project;
10. A description of site conditions prior to project development, including vegetation and other conditions relating to existing and historic groundwater recharge at the site;
11. An analysis of site conditions as they are likely to exist during and after construction of the proposed project, and their cumulative impacts on groundwater quantity and quality;
12. Discussion of proposed mitigation measures to minimize impacts to groundwater quality and quantity, including training, maintenance and monitoring plans, and proposed mechanisms and financial measures that will ensure long-term implementation of mitigation measures; and
13. Any other information as required by the city.
F. The city of Lacey may retain health experts and other consultants with applicable expertise at the applicant’s expense to assist in the review of special studies outside the range of staff expertise.
G. Review and evaluation of the report may be delegated to other city departments and to qualified private consultants at the applicant’s expense.
H. The city of Lacey may waive the hydrogeological report requirements if the nature of the project and its impacts are generally known, or the impacts of the project have been mitigated by source control BMPs. (Ord. 1638 §13, 2023; Ord. 1505 §44 (part), 2017).