Construction & Installation

Protection Standards during Construction

Construction activities occurring where construction vehicles are refueling on site and/or hazardous materials will be stored, dispensed, used or handled will be required to implement the following protection standards during construction:
    1. A development agreement;
    2. Monitoring and construction standards;
    3. Designate a person on site with the appropriate knowledge to be responsible for supervising activities dealing with hazardous materials and training to take mitigating actions necessary in the event of a fire or spill;
    4. Provide adequate secondary containment for hazardous material storage, dispensing, refueling and handling areas;
    5. Hazardous materials shall not be accessible to the public while unsupervised (locked storage sheds, locked fencing, locked fuel tanks etc.);
    6. Construction vehicles and stationary equipment leaking hazardous materials need to be removed and repaired immediately;
    7. Transfer of flammable and combustible liquid from tanks to fluid reservoirs of construction vehicles and stationary equipment have to be in compliance with the Redmond Fire Code (Chapter 15.06 RMC);
    8. Maintain procedures and on site materials adequate to ensure the immediate containment or cleanup of any hazardous material release.

Contact:  Aaron Moldver at 425-556-2756

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Stormwater Infiltration Facility Construction

If you are considering a new construction or redevelopment project with stormwater infiltration you should coordinate with the City's Development Services staff to determine what the current code requires and ensure that you have the proper permits.  The City encourages infiltration of clean stormwater to recharge the aquifer and may allow infiltration of stormwater that has been treated depending on the location of the facility.

The City requires registration of stormwater infiltration systems in Wellhead Protection Zones 1 and 2. The State of Washington requires registration of new infiltration pipes and catch basins; they refer to them as 'wells' or underground injection control (UIC) wells. The state Guidance for UIC Wells that Manage Stormwater is an excellent resource for designing a new system in combination with the Stormwater Management Manual for Western Washington.

If you have an existing stormwater infiltration system that is failing and needs to be rebuilt, it will need to meet the Guidance for UIC Wells that Manage Stormwater.

Contact:  Aaron Moldver at 425-556-2756

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Cathodic Protection Well Construction

Wells installed for cathodic protection (corrosion prevention) are also required to meet City of Redmond specific standards (RMC 15.24.095). Designs for cathodic protection wells shall be submitted to Public Works for review and approval prior to initiation of drilling. Cathodic protection wells shall be constructed such that the following do not occur:
  • Vertical cross-connection of aquifers normally separated by confining units;
  • Migration of contaminated surface water along improperly sealed well borings or casings;
  • Introduction of electrolytes or related solutions into the subsurface; and
  • Any of the above conditions caused by improperly abandoned cathodic protection wells that are no longer in use.
The record and construction details must be submitted to Aaron Moldver within 60 days of completion.

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Fill Material

Placement of imported contaminated fill material (solid material used for re-grading, stabilizing on-site soils for support structures or other property features) is prohibited in the City of Redmond (RMC 15.24.080 (r)). Fill material placed in Redmond shall not contain concentrations of contaminants that exceed State Cleanup Standards specified in WAC 173-340-740, Model Toxics Control Act. Placement of fill in excess of 10 cubic yards within WHP Zones 1 and 2 must be approved by Public Works.

To gain approval for placement of fill, a fill material source statement must be provided to Public Works:
  • The fill material source statement must be issued by a licensed engineer or geologist and clearly demonstrate that the soil is clean by providing 1) analytical testing results, 2) adequate justification that the source area is clean (such as a Phase I/II ESA), or 3) that the material’s source is a WSDOT approved clean source.

Contact:  Aaron Moldver at 425-556-2756

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Hydraulic Lifts and Elevators 

Elevator cylinders and hydraulic lift cylinders that extend below the ground surface are regulated to help prevent contamination of the soil and groundwater from hydraulic fluid releases. Hydraulic cylinders that extend below the ground surface, located within Wellhead Protection Zones 1, 2 or 3, must be encased in an external plastic casing for secondary containment and the annular space must have a port for inspection. Hydraulic system oil shall be a non-toxic, Natural Ester (vegetable based) product, readily biodegradable to ASTM Standard D5864 and OECD 301B].

Contact:  Aaron Moldver at 425-556-2756

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Water in a saturated zone or stratum beneath the surface of the land or below a surface water body.

Hazardous Materials

Any hazardous waste, hazardous substance, dangerous waste, or extremely hazardous waste that is a physical or health hazard as defined and classified in Chapter 70.105 RCW and Chapter 173-303 WAC, whether the materials are in usable or waste condition. Hazardous materials shall also include petroleum or petroleum products that are in a liquid phase at ambient temperatures, including any waste oils or sludges. (Ord. 2180).


The movement of water into soil or porous rock.


The physical structure, facility, or device at the land surface from or through which ground water flows or is pumped from water-bearing formations.

Wellhead Protection Zone

Land areas delineated by the City for purposes of safeguarding groundwaters that supply, or potentially supply, drinking water to wells operated by the City. (Ord. 2269 § 2 (part), 2005: Ord. 2180 § 1 (part), 2003).
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