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KLE/NFELOER <br /> Brigs[People...........ani <br /> • opened and water is allowed to discharge to Potter Creek. When this <br /> happens, the dewatering wells must either be shut down or the water diverted <br /> to holding tanks to limit the flow of the high nitrate-nitrogen concentration <br /> water from entering Potter Creek. <br /> This BMP is still being used as modified above. <br /> 6. Norman's Nursery installed a calibrated depth gauge in on-site Basin B. The <br /> gauge is read daily. This data is useful in assessing the water loss from the <br /> basin because of evaporation and infiltration. <br /> The water level measuring gauge was removed during maintenance of <br /> the basin in October of 2003 and should be replaced to implement this <br /> BMP. <br /> 7. Norman's Nursery collects and analyzes water samples from the on-site run- <br /> off basin monthly. Water from the discharge of the dewatering wells also is <br /> • pumped to the Basin B and sampled weekly. The samples are analyzed for <br /> nitrate concentrations. KI-Nitrifier (a biological additive which increases nitrate <br /> consumption in the basin) is added when high concentrations of nitrate are <br /> reported in the samples. Basin water is reused in water trucks onsite for dust <br /> control, as needed. <br /> This BMP is still being used. <br /> 8. Quarterly, the water contained in Basin B is sampled and analyzed for nitrate. <br /> This BMP has been implemented for nitrates-nitrogen and ammonia- <br /> nitrogen analysis; and only when the culverts are closed and Basin B <br /> contains irrigation tailwater. Otherwise, the discharge from Basin B is <br /> sampled(see MRP by the RWQCB). <br /> • <br /> 117226.E02/ST012R0696 Page 31 of 43 September 14, 2012 <br /> Copyright 2012 Kleinfelder <br />