15.24.095 Wellhead and groundwater protection performance standards.
A. Well Construction and Operation. Construction or decommissioning details and registration forms of any well regulated under Chapter 173-160 WAC and UIC wells (infiltration trenches, drywells, infiltration vaults) must be registered per WAC 173-218-070. Details and registration forms shall be provided to the Department of Public Works within sixty (60) days of well construction or decommissioning.
B. Fill Material. Placement of imported contaminated fill material is prohibited, citywide. Fill material shall not contain concentrations of contaminants that exceed cleanup standards for soil specified in WAC 173-340-740, Model Toxics Control Act, regardless of whether all or part of the contamination is due to natural background levels at the fill source site. Where the detection limit (lower limit at which a chemical can be detected by a specified laboratory procedure) for a particular soil contaminant exceeds the cleanup standard for soil specified in WAC 173-340-740, the detection limit shall be the standard for fill material quality. Fill material shall be free of construction, demolition, and land clearing waste including recycled concrete rubble and asphalt.
1. Fill materials in quantities greater than 10 cubic yards placed directly on or in the ground shall meet the following requirements:
a. A fill material source statement shall be provided to the Department of Public Works and shall be reviewed and accepted by the Department prior to stockpiling or grading imported fill materials at the site. The source statement shall be issued by a professional engineer, geologist, engineering geologist or hydrogeologist licensed in the State of Washington demonstrating the source’s compliance with standards of the Model Toxics Control Act. The source statement shall be required for each different source location from which fill will be obtained.
b. Analytical results demonstrating that fill materials do not exceed cleanup standards specified in WAC 173-340-740 may be used in lieu of a fill material source statement, provided the regulated facility submits a sampling plan to, and which is approved by, the Director of Public Works. The regulated facility must then adhere to the approved sampling plan, and maintain analytical data on-site and available for inspection for a minimum of five years from the date that the fill was accepted.
2. The Department of Public Works may accept a fill material source statement that does not include results of sampling and analysis of imported fill if it determines that adequate information is provided indicating that the source location is free of contamination. Such information may include, but is not limited to:
a. Results of field testing of earth materials to be imported to the site with instruments capable of detecting the presence of contaminants; or
b. Results of previous sampling and analysis of earth materials to be imported to the site.
3. A fill material source statement is not required if documents confirm that imported fill will be obtained from a Washington State Department of Transportation approved source.
4. The Director of Public Works shall have the authority to require corrective measures regarding noncompliant fill materials, including independent sampling and analysis, if the property owner or operator fails to accomplish such measures in a timely manner. The property owner or operator shall be responsible for any costs incurred by the City in the conduct of such activities.
C. Cathodic Protection Wells. Designs for cathodic protection wells shall be submitted to the City for review and approval prior to initiation of drilling. Cathodic protection wells shall be constructed such that the following do not occur:
1. Vertical cross-connection of aquifers normally separated by confining units;
2. Migration of contaminated surface water along improperly sealed well borings or casings;
3. Introduction of electrolytes or related solutions into the subsurface; and
4. Any of the above conditions caused by improperly abandoned cathodic protection wells that are no longer in use.
D. Underground Hydraulic Elevator Cylinders. All underground hydraulic elevator pressure cylinders shall be encased in an outer plastic casing constructed of Schedule 40 or thicker-wall polyethylene or polyvinyl chloride (PVC) pipe, or equivalent. The plastic casing shall be capped at the bottom, and all joints shall be solvent- or heat-welded to ensure water tightness. The neck of the plastic casing shall provide a means of inspection to monitor the annulus between the pressurized hydraulic elevator cylinder and the protective plastic casing. Vegetable oil shall be used for hydraulic fluid in elevator cylinders. (Ord. 3081 § 2, 2022; Ord. 2860 § 3 (part), 2016: Ord. 2532 § 2 (part), 2010: Ord. 2257 § 1, 2005).