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JUN 31981 BOOK 46 PM7 622 2) Some storage capacity above the water table is desirable to provide for extreme water table fluctuations or rainfall periods, and a high water table should be encouraged to protect against saltwater intrusion promoted by increased withdrawals in -coastal wellfields. , Therefore, in response to your request for comments, my suggestion is that land mining operations should not mine below five (5) feet above the mean annual high water table. Indian River County has some interesting geological and hydrolo- - gical factors which are important to its future. Utilizing brackish Floridan Aquifer water to irrigate on top of the shallow aquifer must be monitored very conscientiously to prevent water quality degrada- tion of your primary ground water aquifer. I understand the United States Geological Survey and Water Management District have some investigations and plans for placing observation wells along the ridge. Perhaps the county would consider partially participating in.this joint effort as a inexpensive means of securing desirable information. I hope these suggestions are useful in your efforts with the ordinance. Additional comments are noted on the enclosed draft. Sincerely, James AicNe Groundwater Section County Ordinances - Reference List Polk County Ordinance 72-3 Zoning, Planned Sand Mine Operation Ordinance 75-2 Limerock Mining Article IV - Part 2, Section 4-2. P -1 -Planned Mining Operations, Phosphate Manatee County (currently being discussed for re -write Z-92, Section VI, Para. 16 as amended, Zoning Ordinance Desoto County Ordinance 74-6 Article XXI of Zoning Code Sarasota County Ordinance 72-83 Mining Hardee County Amendment #1 to Zoning Ordinance 73-6, §25 M-1, Mining and Earth Moving Hillsborough County Ordinance 74-6 Phosphate Mining 52