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North County Recycling Center and Sanitary Landfill Storm Water Pollution Prevention Plan Page 57 Table 12.3.B – Selected 2016/2017 Sampling Results In evaluating the NAL exceedance for iron and aluminum, some interesting correlations with the analytical data were noted: 1. The season high concentrations of both iron and aluminum occurred during the first sampled storm event. For the samples collected at SW-4, the metal concentrations declined with each successive sampling event. This was not the case for the samples collected at SW-3. It should be noted that the samples were collected within a relatively short period of time, approximately 4 weeks. 2. There was no apparent correlation between Total Suspended Solids (TSS) and the metals. For both sample points, the high TSS concentration did not correlate with the high iron or aluminum concentration. 3. The TSS concentrations were relatively low (well below the NAL) and do not indicate a problem with erosion or sedimentation. 4. The two drainage areas have very distinct industrial activities, yet iron and aluminum concentrations were very similar for both sample points and have a direct and precise correlation. For example, SW-3 receives runoff from the recycling center, the vehicle and equipment maintenance center, the green waste area, the bin storage area, and high traffic areas of the landfill, which comprise most of the suspected iron contributing activities. It is also downwind of most landfill activities. However, it had iron and aluminum concentrations very comparable to the samples collected at SW-4 which receives flow only from the capped Landfill Modules M1, M3, and M4 and a less-used paved access road. The date of the high iron concentration sample was the same as the date of the high aluminum concentration for both sample locations (1/10/17). The low aluminum and iron concentrations occurred on the same day for SW-3 (1/20/17) and on the same day for SW-4 (2/7/17). 5. Dissolved iron concentrations tested at SW-3 and SW-4, as required by the facility’s Waste Discharge Requirements, essentially did not vary and no direct correlation was noted with the total iron concentration variations. Annual NAL Evaluation Worksheet San Joaquin County North County Landfill Units Annual NAL Instantaneous NAL ELG Monthly Average ELG Max Daily 1/10/2017 1/20/2017 2/7/2017 N/A 1/10/2017 1/20/2017 2/7/2017 N/A Average Annual NAL Exceeded? (Yes/No) Monthly Average ELG Exceeded? Max Daily ELG Exceeded? mg/L 100 400 27 88 12.4 7.52 20 15.7 16.2 10.6 13.737 No No No mg/L 1 2.49 1.42 1.98 3.39 2.06 1.02 2.060 Yes mg/L 3.34 3.34 0.134 0.135 0.13 0.401 0.426 0.304 0.255 No No mg/L 0.75 2.63 1.31 1.79 4.12 2.41 0.706 2.161 Yes Suspended Solids (TSS), Total Iron, Total Iron, Dissolved Parameter SW-3 SW-4 Aluminum, Total