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Estimated Annual Sediment Load <br /> Ac-ft/ac Total Ac-ft <br /> .0643 .75 <br /> .0273 .20 <br /> .0218 . 08 <br /> Total Sed. 1. 03 ac-ft. <br /> Minimum Required Storage Capacity <br /> Disturbed Annual Sed. Min. Total <br /> _ Area Storage ac-ft. 10 yr. flood Storage (AF) <br /> 1 .75 1. 18 1. 93 <br /> lA .20 .20 .40 <br /> 2 .08 . 29 . 37 <br /> Total 2. 70 ac-ft <br /> Since the ponds have a total storage of 3.89 acre-feet the <br /> Savage pond can be deleted. However, a small 20'x20'x8 ' pond <br /> should be left to capture any oil and grease coming from the shop <br /> area. The existing discharge structures can be left in place. <br /> This pond will have to be cleaned out when the sediment level <br /> rises to the discharge structure. <br /> Past operating experience has shown that the four ponds have <br /> been more than adequate to contain a 10 year-24 hour event. This <br /> is evident by the fact that the fourth pond has almost never been <br /> required to be cleaned of sediment. Deleting the Savage Mond <br /> will require the fourth pond to be cleaned on a yearly basis . <br /> James Scott Jones <br /> CO.PE. NO. 24233 <br /> 62 <br />