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KLE/NFELOER <br /> Bright People R„esom„on,. <br /> 3 . Where feasible , " RainBird"TM spray-type emitters have been replaced with drip <br /> irrigation systems . <br /> This BMP was done. For example, during the winter of 1997- 1998 the nursery <br /> converted 18, 000 5-gallon patio tree roses, 50, 000 2-gallon roses, 20, 000 5- <br /> gallon roses, and 50, 000 ground cover roses to drip irrigation. On plants <br /> where it is unfeasible to convert to drip irrigation, lower flow RainBird <br /> emitters were installed. Most of the plants in the shade structures have been <br /> changed to a drip-soil spitter emitter that will further reduce water usage. <br /> 4 . An increased number of emitters have been placed in large tree drip irrigation <br /> systems . Smaller trees need less water; however, to completely irrigate the larger <br /> tree (when both sizes had equal numbers of emitters) the smaller trees were being <br /> overwatered . <br /> This has since been corrected. <br /> 5 . Currently, onsite runoff is collected and diverted primarily into the onsite storage <br /> basin (" Basin B" ) . This runoff is monitored during the year, and is primarily <br /> contained within the basin . Additional discharge of groundwater from the three <br /> dewatering wells installed on the site is pumped to Basin B . When nitrate-nitrogen <br /> of the dewatering well effluent exceeds the Maximum Contaminant Level (MCL) as <br /> stated in 22CCR , the basin water undergoes regular dentrification . However, <br /> during storm events when significant quantities of storm water moves across the <br /> site , the gate valve to Basin B is opened and water is allowed to discharge to <br /> Potter Creek . When this happens , the dewatering wells must either be shut down <br /> or the water diverted to holding tanks to limit the flow of the high nitrate-nitrogen <br /> concentration 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 basin <br /> because of evaporation and infiltration . <br /> The water level measuring gauge was removed during maintenance of the <br /> basin in October of 2003 and should be replaced to implement this BMP. <br /> 117226 . E02/ST013R0176 Page 29 of 40 January 31 , 2013 <br /> Copyright 2013 Kleinfelder <br />