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03-25-81 v A MINUTES OF THE SPECIAL CALL MEETING OF THE ATLANTIC BEACH CITY V V COMMISSION HELD AT THE CITY HALL ON MARCH 25,1981 AT 7:30 P.M. O 0 T T PRESENT: William S. Howell, Mayor-Commissioner E E Alan C. Jensen D D L. W. Minton, Jr. Catherine G. Van Ness, Commissioners M S AND: Bill M. Davis, City Manager 0 E T C Oliver C. Ball, City Attorney I 0 Y Adelaide R. Tucker, City Clerk NAME OF ONEN ABSENT: James E. Mhoon, Commissioner COMMRS. N D S 0 Mayor Howell called the meeting to order for the purpose of discussing the drainage system for Selva Marina Garden. The City Engineer, Mr. Walter J. Parks, Jr. , and Mr. Bull's engineer, Mr. Allan Potter, were present. Mr. Parks asked if the proposed plat showing the easement for the sewer line had been submitted. Mr. Potter answered in the affirma- tive, and Mr. Davis confirmed that the plat shows the easement. Mr. Parks then asked Mr. Potter if he had noted on his drawings about re- lieving the earth pressure on a certain manhole and making a new connec- tion. Mr. Potter replied in the negative, and stated that it would be so noted on the final drawings. Mr. Potter also stated that his notes call for a representative from the City to be present when the existing water main is tapped, and when new lines are tested. A discussion then started on the valley gutters, the last item which remained unresolved. Mr. Potter presented a full-size cross section of a typical valley gutter that he proposed to use. He explained that the road is planned to have roadside grass swales on both sides. The soil in the neighbor- hood is primarily sand. Percolation of rain that runs off pavements and driveways to the roadside swales, in most occasions, will occur within the swale area. He added that, in the event complete percolation does not occur, the streets will be graded, and the swales will be graded to come downhill to an intersection and traverse across the pavement 5' wide and 55' long. Mr. Potter demonstrated how the water flow would be handled by construction of the swales. The swale system was selected in lieu of underground pipe inasmuch as the area is small (and with poor soil and with the limited contributing area for run-off there is a slight amount of water that will flow in a heavy rain, but it is such an insignificant quantity compared to the minimum flow necessary to keep the pipes clean). If there is insufficient water flow, the pipes will fill up with sand and debris. For that reason, due to the low flow, underground pipe was not selected. Had there been a bigger drainage area with a greater probable flow of rainfall there would be no question as to inlets and such. Mr. Potter said there is not a large quantity of water, and added that an underground culvert system would only create a maintenance problem for the city. Mr. Parks coimuented that the proposed swales are sometimes called"Texas bridges" because there are areas in Texas that are dry for the greater part of the year, but you may go there some day and be up to your chin in water. because they carried the water across the road and not under I;. r 1 PAGE TWO V V MINUTES Names of MARCH 25, 1981 Commrs. M S Y N _ e i., Discussion - Parks and Potter - continued Bigger swales would work all over town but only the water would get deeper, and you still will have bumps in the streets. Mr. Parks added that is the reason that he has requested the provision of the catch basins because the water that comes down has no way to get to the mosquito control ditch other than to cross the intersection either by Mr. Potter's proposed device or by the normal method of storm sewers. He voiced the opinion that if the swales are used now, the City will still have to put in the catch basins and storm sewers that should go in now within the next ten years. Mayor Howell asked Mr. Parks if he had the layouts for the proposed future development could that possibly change his opinion, and he answered in the negative. Commissioner Van Ness asked the Chief of Police for his opinion of the dip in the street and he did not have a comment at that time. Commissioner Jensen stated that he had no objection to the dip in the street. After further discussion, Commissioner Jensen suggested a third independent opinion be obtained as none of the Commissioners were engineers. Mr. Parks asked Mr. Davis to state the position the City of Jacksonville takes on such matters. Mr. Davis said that the City of Jacksonville's engineering department advised him that they will allow valley gutters if the section of the street to be served by the valley gutters does not exceed approximatEly 150 feet. The Chair asked if anyone wished to move that the position of the City Commission taken at a previous meeting in regarcs to the approval of the plat be changed. No motion was made. The position stands that the plat cannot be signed or approved until the city engineer wished to sign off on the engineering for the water, sewer, and drainage systems. The Chief of Police asked for a legal opinion on the wooded areas of the new units in Selva Marina where the streets are not dedicated. He said that in an attempt to landscape the islands, etc. logs and posts are being placed in the area which will tremendously reduce the ability to put fire trucks in the area. He asked what position the city could take as to removing these obstacles. Mr. Ball answered this is the same as private property but it is pseudo-public. He considered the streets to be the same as the Pic N Save parking lot, and if there is a health or safety hazard, the city has the authority to employ city employees to remove any obstacles and assess the owners for the city's cost. A citizen in the audience stated that he lived in the area and had recently placed logs off the roadway for the purpose of slowing the traffic down and to avoid the erosion of sand Mayor Howell suggested that all the owners keep the logs and other possible obstacles off the designated right-of-way and stay on their own property and then problems would not arise. There being no further business, the Mayor declared the meeting adjourned. (SEAL) ATT S • William S. Howell ATT Mayor-Commissioner Adelaide R, Tucker