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KLE/NFELDER <br /> �Gi9Ft hoPk.Pi9f 5alu0onx <br /> 14. The concentrations of nitrate as N exceeded the MCL of 10 mg/I in samples <br /> collected from the dewatering discharge the quarter. The WQGs for ammonia as <br /> N, including the SNARL and T&O Threshold were not exceeded in any of the <br /> surface water samples collected during the quarter. <br /> 15. Rainfall was monitored on the Norman's Nursery site by nursery personnel from <br /> June 2, 1997 to present. There were 6 days of noted precipitation recorded during <br /> the quarter. The precipitation total was 2.9 inches during the quarter and 20.52 <br /> inches for.the calendar year. Precipitation totals for each day are listed on the <br /> attached Table 2 and graphed on Chart 2-7. <br /> 16. The vineyard operation ("Duarte Property") to the south of Norman's Nursery has <br /> on occasion allowed their runoff to enter the Norman's Property in the streambed <br /> south of Basin C. <br /> 17. Three dewatering wells were installed in 2002 along the nursery's northwest <br /> boundary, east of Escalon-Bellota Road and west of MW-5. The dewatering wells <br /> are spaced approximately 75 feet apart, extending north to south. The dewatering <br /> wells still operate. Discharge from the dewatering wells is directed to Basin B for <br /> denitrification treatment. Groundwater samples were collected from the dewatering <br /> discharge. The nitrate as N concentrations in the samples collected of the <br /> discharge during the fourth quarter of 2011 exceeded the MCL of 10 mg/I. <br /> 18. During previous routine maintenance of Basin B, which included the excavation of <br /> sediments, the water level measuring gauge was removed. Since the removal of <br /> the gauge in October 2003, water levels have not been measured in Basin B. <br /> Kleinfelder recommends the replacement of the water level gauge in Basin B. <br /> I19. Norman's Nursery is making significant efforts beyond those required by the <br /> RWQCB to implement BMPs to further limit potential impact of fertilizers in the <br /> irrigation water on surface and groundwater quality. Those efforts include attempts <br /> to limit irrigation water and fertilizer use, and to decrease irrigation tailwater <br /> volumes and potential concentrations of nitrates in the tailwater. <br /> 117226.E02/ST012R0693 Page 38 of 42 September 11, 2012 <br /> Copyright 2012 Kleinfelder <br />