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North County Recycling Center and Sanitary Landfill Storm Water Pollution Prevention Plan Page 25 7.0 Assessment of Potential Pollutant Sources North County Landfill periodically reviews storm water observation and analytical data for the North County Landfill in order to evaluate the effectiveness of existing BMPs and monitor operational changes that may affect the quality of the facility’s storm water discharge. A formal assessment is done at the end of each storm water year in conjunction with the annual evaluation, and the preparation of the annual report. 7.1 Narrative Assessments North County Landfill annually reviews and evaluates its activities in light of the storm water discharge observations and analytical data from each outfall. 7.1.1 Sampling Parameters The General Permit in Section XI.B outlines storm water sampling parameters that are to be analyzed. The sampling parameters are to be analyzed using sufficiently sensitive test methods in compliance with 40 CFR Part 136, or 40 CFR Chapter I, subchapters N and O in order “to detect and quantify pollutants at or below the applicable water quality criteria, action levels, or effluent limitations” for any applicable NPDES permit.3 7.1.1.1 Universal Sampling Parameters All storm water discharges are to be sampled for Total suspended solids (TSS), oil and grease (O&G), and pH. 7.1.1.2 Facility-Specific Sampling Parameters The General Permit requires in Section X.G.2.a.ii to assess “pollutants likely to be present in industrial storm water discharges and authorized NSWDs.” Then in Section XI.B.6.c the General Permit also requires that dischargers are to include in their monitoring programs other parameters that are facility-specific (based on the General Permit Section X.G.2.a.ii assessment) and are indicators of the presence of potential pollutants present in storm water from the facility’s industrial pollutant sources. In addition, the General Permit requires dischargers to include in their monitoring programs other parameters that are facility-specific and are indicators of the presence of potential pollutants present in storm water from the facility’s industrial pollutant sources. Since paper and organic trash and debris are a common waste stream handled at this facility, the facility will add Biological Oxygen Demand (BOD) and ammonia to its list of analytes. Heavy metals aluminum, 3 see 2018 Industrial Storm Water General Permit Amendment Fact Sheet at https://www.waterboards.ca.gov/water_issues/programs/stormwater/docs/industrial/igp_factsheet_final.pdf or Amended General Permit Section I.K.69 When do Federal Sub-chapter N Effluent Limits Guidelines (ELGs) Apply? Section 445 of Sub-chapter N states that the effluent limits apply to landfill wastewater, which is defined as all wastewater associated with, or produced by, landfilling activities except for sanitary wastewater, non- contaminated storm water, contaminated ground water, and wastewater from recovery pumping wells. Landfill wastewater includes, but is not limited to, leachate, gas collection condensate, drained free liquids, laboratory derived wastewater, contaminated storm water and contact wash water from washing truck, equipment, and railcar exteriors and surface areas which have come in direct contact with solid waste at the landfill facility. Contaminated storm water means storm water which comes in direct contact with landfill wastes, the waste handling and treatment areas, or landfill wastewater. Therefore, if the storm water runoff is from non-contaminated storm water (as defined above), the ELGs do not apply. At the North County Landfill, discharge from the Interim Sediment Basin (SW-2) is applicable to the ELGs, while discharges from SW-3 and SW-4 are not applicable to ELGs because water from those discharge points does not come into contact with landfill wastes or wastewater.