14.60.120 Operating conditions and standards of performance.
All clearing and grading activities in the City shall conform to the City’s adopted regulations as set forth in the municipal code and the provisions of this section as follows:
(1) All standards under this chapter shall be consistent with the City’s adopted stormwater and reference manuals adopted in CMC 13.25.020, herein referred to as the “City’s stormwater manual.”
(2) The site shall be operated and maintained in a neat and orderly manner, free from junk, trash, or unnecessary debris.
(3) Prior to the start of clearing and grading operations, the applicant shall identify all proposed haul routes and access points to the site for review and approval by the City.
(4) The applicant must properly handle and dispose of other pollutants that are on site during construction so as to avoid possible health risks or environmental contamination. Direct and indirect discharge of pollutants to the drainage system, critical areas, wetlands, streams, or any other adjacent properties is prohibited. Storage of fuel or other hazardous substances on site is prohibited.
(a) All pollutants, including waste materials and demolition debris, that occur on site shall be handled and disposed of in a manner that does not cause contamination of stormwater.
(b) Cover, containment, and protection from vandalism shall be provided for all chemicals, liquid products, petroleum products, and other materials that have the potential to pose a threat to human health or the environment. On-site fueling tanks shall include secondary containment.
(c) Maintenance, fueling, and repair of heavy equipment and vehicles shall be conducted using spill prevention and control measures. Contaminated surfaces shall be cleaned immediately following any spill incident.
(d) Wheel wash or tire bath wastewater shall be discharged to a separate on-site treatment system or to the sanitary sewer with local sewer district approval pursuant to State Department of Ecology standards, unless modified by the Director.
(e) Application of fertilizers and pesticides shall be conducted in a manner and at application rates that will not result in loss of chemical to stormwater runoff. Manufacturers’ label requirements for application rates and procedures shall be followed.
(f) Best management practices shall be used to prevent or treat contamination of stormwater runoff by pH modifying sources. These sources include, but are not limited to: bulk cement, cement kiln dust, fly ash, new concrete washing and curing waters, waste streams generated from concrete grinding and sawing, exposed aggregate processes, dewatering concrete vaults, concrete pumping and mixer washout waters. Construction site operators shall adjust the pH of stormwater if necessary to prevent violations of water quality standards.
(g) Construction sites with significant concrete work shall adjust the pH of stormwater if necessary to prevent violations of water quality standards. Construction site operators shall obtain written approval from the State Department of Ecology prior to using chemical treatment other than CO2 or dry ice to adjust pH.
(5) The applicant shall be responsible that the requirements found either in the City’s stormwater manual or outlined below are met for the following:
(a) Site containment;
(b) Installing sediment controls;
(c) Stabilizing disturbed areas;
(d) Stabilizing channels and outlets.
(6) Land disturbance activities shall not result in off-site physical damage, nor pose a danger or hazard to life or property. Such activities shall neither contribute to nor create landslides, accelerated soil creep, or settlement of soils.
(7) Dewatering Devices.
(a) Foundation, vault, and trench dewatering water that has similar characteristics to stormwater runoff at the site shall be discharged into a controlled conveyance system prior to discharge to a sediment pond. Channels must be stabilized according to the standards in the City’s stormwater manual.
(b) Clean, nonturbid dewatering water, such as well-point groundwater, can be discharged to systems tributary to State surface waters provided the dewatering flow does not cause erosion or flooding of receiving waters. These clean waters should not be routed through stormwater sediment ponds.
(c) Highly turbid or contaminated dewatering water shall be handled separately from stormwater.
(d) Other disposal options, depending on site constraints, may include:
(i) Infiltration.
(ii) Transport off site in a vehicle, such as a vacuum flush truck, for legal disposal in a manner that does not pollute State waters.
(iii) On-site treatment using chemical treatment or other suitable treatment technologies.
(iv) Sanitary sewer discharge with local sewer district approval.
(v) Use of a sedimentation bag with outfall to a ditch or swale for small volumes of localized dewatering.
(8) Site-Specific Requirements. Additional site-specific requirements may be established after a site visit by the City. These requirements shall be based on specific site conditions and are limited to additional temporary erosion and sedimentation control and the mitigation of hazardous or potentially hazardous conditions that pose a threat off site or to habitat preservation. (Ord. 04-19 § 2 (Exh. B); Ord. 08-13 § 1 (Exh. A))