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Foothill Landfill <br />Storm Water Pollution Prevention Plan <br /> <br /> <br /> <br />Page 62 <br /> <br /> <br />Because of the lack of industrial activities in the drainage areas that were experiencing high <br />iron concentrations, WGR suspected the natural soils to be the source of the iron. To that <br />affect, soil samples were collected and tested, and research was performed of the soil types <br />present at the facility. On April 28, 2017, soil samples were collected from non-industrial <br />discharge point areas ST-1, ST-6, and ST-7 and were analyzed for total iron. Three sets of <br />samples were collected (one set at each of the discharge points) that exceeded the iron NAL. <br />Each set of samples had soil grab samples collected at the following places (refer to SWPPP <br />Map 5 for the sample and drainage area locations): <br />• Downstream areas of the discharge point but in a location that was not in contact with <br />concentrated runoff or industrial activities (designated by “Drainage Area A”); <br />• Up-gradient areas of the discharge point but in a location that was not in contact with <br />concentrated runoff or industrial activities (designated by “Drainage Area B”); and <br />• Soil collected at the discharge points directly within the path of runoff (designated by <br />“Drainage Area C”). <br />Figure 23 – Sampling Locations Along Waverly Road <br />ST-1 <br />2016/2017 Averages: TSS 7.7 mg/l Fe 1.16 mg/l <br />ST-6 <br />2016/2017 Averages: TSS 9.5 mg/l Fe 1.76 mg/l <br />ST-7 <br />2016/2017 Averages: TSS 7.1 mg/l Fe 1.33 mg/l