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22 <br /> Addendum 1 -Hillsborough Water Purchases (June 1991) <br /> To the Eno River Voluntary Water Use Agreement <br /> When Lake Orange is above 100 percent full and is spilling, Hillsborough will be allowed partial credit for <br /> water purchased from an outside source and discharged into the Eno River west of county road 1009 during the <br /> monitoring week that the discharge occurs, at a credit rate of 60 percent of the total discharge,when the discharge <br /> is made over a 24-hour period or greater.The credit volume will be divided by 7 days and added to the withdrawal <br /> limit listed in Table 1,to determine the allowed average daily withdrawal for that week. In the event that the <br /> flushing discharge straddles two monitoring weeks,the credit volume will be applied equally between the two <br /> weeks. The Orange County Engineer, or DWR staff in his absence, must be notified of the volume and the duration <br /> upon completion of the flushing. A written report of the flushing, detailing exact dates,times, and volumes, shall <br /> be included in the monthly report to DWR. If notification is not received with that month's water use report, no <br /> credit will be granted, and any excess water use will be labeled as a violation of this agreement. The Division of <br /> Water retains the right to revoke permission for Hillsborough to receive credit for flushed flows if at any time, in <br /> the opinion of the Division,the ability of Ben Johnston Dam to meet downstream flows may be compromised. Said <br /> revocation will be in effect until there is notice by DWR that the problem has been corrected to its satisfaction. If <br /> Lake Orange is not spilling, no credit will be allowed. <br /> -In the event that flow at the Eno River at Hillsborough streamflow gage is over 10 cfs, Corporation Lake and Lake <br /> Ben Johnston are both spilling water over the dams, purchases of water are being made from outside of the Eno <br /> River Basin, and the low flow period has not yet ended, users may cease their outside purchase of water and <br /> withdraw the amount of water allowed in the absence of a low flow period, as long as the ability to resume <br /> purchase of water for immediate customer delivery remains. This time period has been determined to be three <br /> days for the OWASA line. Water purchases will be made as often as necessary to flush the lines and keep them <br /> from stagnating. If flows drop below 10 cfs before the low flow period is over, Eno River withdrawals must <br /> immediately be reduced to Table 1 levels. <br /> -Transfer of water allocation between users is permissible under the following conditions: 1) Lake Orange is greater <br /> than 80 percent full; 2) notification of the duration and specific volume of the transfer will be given by the <br /> surrendering party to the Orange County Engineer, or the DWR in his absence, a minimum of one day before the <br /> transfer is to take place; 3)the total allocation will be adjusted if necessary by the averaging period of the <br /> surrendering party, and 4)written notification of the duration and volume of the transfer will be provided by both <br /> involved parties in their monthly water use reports to DWR. If prior notification is not received, DWR will not <br /> recognize the allocation transfer. <br /> 9 <br />