2018-02-02_REVISION - C1981019 (9)

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PART [I Pennit - Page 27 Permit No. COR -030000 If. CHANGES IN THIS GENERAL PERMIT (cont.) Where adequate management practices are not followed to protect groundwater quality, the Department may require discharges to unlined pits to cease, or require the entity to obtain alternate regulatory approval through notice from either the Water Quality Control Division or the Hazardous Materials and Waste Management Division. In addition, Part LD.1(b) of the permit has been revised to clearly state that the permit does not authorize on-site permanent disposal of concrete washout waste, only gtt ro-0y cLiptginment of concrete washout water front washing of tools and concrete mixer chutes. Upon termination of use of the washout site, accumulated solid waste, including concrete waste and any contaminated soils, must be removed from the site to prevent on-site disposal of'solid waste. v) Construction Dewatering. Part LD. 3(d) of the permit has been revised to conditionally authorize discharges to the ground of water from construction dewatering activities when appropriate BMP.s are implemented. The permit does not authorize the discharge of groundwater from construction dewatering to surface waters or to storm sewer systems. Part L C. 3(c)(8) oj'the permit requires that BMPs be in place to prevent surface discharges. The permittee may apply, for coverage under a separate CDPS discharge permit, such cis ,the Construction Dewatering general permit, if there is a potential for discharges to surface waters. The Division has determined that potential pollutant sources introduced into groundwater from construction dewatering operations do not have a reasonable potential to result in exceedance of groundwater standards when the discharge is to the ground Theprimary y pollutant of concern in uncontaminated groundwater is sediment. Although technology- based standards for sediment do exist in S CCR 1002-41, the discharge of sediment to the ground as part of construction dewatering does not have the reasonable potential to result in transport gf'sediment to the groundwater table so as to result in an exceedance ofthose standards. For a discharge of water contaminated with other pollutants that are present in concentrations that may cause an exceedance oj'groundwater standards, separate CDPS discharge permit coverage is required. Contaminated groundwater may include that contaminated with pollutants from a landfill, mining activity, industrial pollutant plume, underground storage tank, or other source of human -induced groundwater pollution and exceeding the State groundwater standards in Regulations S CCR 1002-41 and 42. J. Ter tus and candl o� s' �n iwl Limilations and Deskit Standards This section reiterates the requirement that facilities select, install, implement, and maintain appropriate BMPs, following good engineering, hydrologic and pollution control practices. In addition, requirements for protection of water quality standards (see Part I.D. 1. (a) of the permit) and requirements to adequately design BMPs to prevent pollution or degradation of State waters (see Part LD.2 of the permit) have been revised and are f ally discussed in Part III.B of the rationale, below. Additional language was also added to Section III.B of the rationale further claming the expectations for compliance with this permit. r MULr ement 1) s to Waste This section has been modified to clam that on-site waste must be properly managed to prevent potential pollution of State waters, and that this permit does not authorize on-site waste disposal. Solid waste disposal is regulated by the Hazardous Materials and Waste Management Division.