Agmt13 Redwood City Partners, LLC Dewatering License

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natural background in the groundwater extracted for cleanup.Because this Order would exclude coverage for sites where there is persistent metals contamination,and the relative small load of background metals to the Bay from all the discharges,a finding of undetermined is appropriate. [4] Criterion based on the Basin Plan marine SSO for copper,a�d the site-specific translators(0.53 acute and chronic)for the Lower and South Bay. [5] Criterion based o�the Basin Plan marine SSO for copper,and the site-specific translators(0.87 acute,0.73 chronic)for the Central Bay. [6] Criterion based on the Basin Plan marine SSO for copper,and the site-specific translators(0.66 acute,0.38 chronic)for Suisun and San Pablo Bay. [7] Criterion based on the Basin Plan marine SSO for nickel and the site-specific translators(0.44 acute and chronic)for the Lower and South Bay. [8] Criterion based on the Basin Plan marine WQO for nickel,and the site-specific translators(0.85 acute,0.65 chronic)for tbe Central Bay. [9] Criterion based on the Basin Plan marine WQO for nickel,and the site-specific translators(0.57 acute,0.27 chronic)for Suisun and San Pablo Bay. [10] Criterion based on the Basin Plan marine SSO for cyanide. [11] Total Residual Chlorine:The water quality objective applicable to total residual chlorine is the Basin Plan narrative objective for toxiciry which states°[a]Il waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms." e. Constituents with limited data In some cases,Reasonable Potential cannot be determined because effluent data are limited, or ambient background concentrations are unavailable. When additional data become available, further RPA will be conducted to determine whether numeric effluent limitations are necessary. f. Pollutants with No Reasonable Potential WQBELs are not included in this Order for constituents that do not demonstrate Reasonable Potential; however,monitoring for those pollutants is still required. If concentrations of these constituents are found to have increased significantly,the Discharger will be required to investigate the sources of the increases. Remedial measures are required if the increases pose a threat to receiving water quality. g. RPA Determination for Sediment Quality Objectives To date there is no evidence directly linking compromised sediment conditions to the discharges subject to this Order; therefore the Regional Water Board cannot draw a conclusion about Reasonable Potential for the discharges to cause or contribute to exceedances of the sediment quality objectives. However, due to the relatively small discharge volumes and the type and level of treatment, it is unlikely that the discharges would contribute to exceedance of sediment objectives. 4. WQBEL Calculations a. Pollutants with Reasonable Potential. WQBELs were developed for the toxic and priority pollutants that were determined to have Reasonable Potential to cause or contribute to exceedances of the WQOs or WQC. The WQBELs were calculated based on WQOs and the appropriate procedures specified in Section 1.4 of the SIP. The WQOs used for each pollutant with Reasonable Potential are discussed below. b. Shallow/Deep Water Discharge. The Basin Plan defines a deep water discharge as a discharge through an outfall equipped with a diffuser that achieves a minimum initial dilution of 10:1. Because the General Permit authorizes discharges to many types of receiving waters, Dischargers covered under the General Permit are classified by the Attachment F—Fact Sheet p_ZZ For VOC and Fuel General NPDES Permit No.CAG912002