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April 14, 1960 Atherton Island Home Owners' Association Box 11, Atherton island Stockton, Califcrnia Attention Mrs. Bud Klein Gentlemen; re Atherton Island Swimming rooi we are contacting all ewCeming pool operators, and listing items needing correction or repair prior to the onset of heavy pool usage. The following items will require attention and correction at the above named pool; Computed pool capacity and filter bed area reveal that the filters and circulation system fail to provide an e hour turnover of pool water, as provided by the L-as and eegulations elatin g to Swimming Pools. Two surface skimmers lave been installed. current standards require one skimmer for each 5d0 square feet of pool surface area. Iwo additional skimmers should be installed at locations which take advantage of natural skimming action ox prevailing winds. The main drain of the pooi should be connected to the recirculation nystem. The skimmers are to be capable of circulating at least 50 percent of the recirculation capacity. Provide a chlorinator that meets the requireidents of Section 7806. No provision has been made to prevent bad: siphonage from the pool through the male-up line and valves into the domestic water supply. Provision :Just be tilt‘de to conform with Section 7797. Provide depth markers on Ueth upper edge of pool wall and on edge of pool depth at points of maximum depth, minimum depth, and breal, point depth, and at no more than 2!-J foot intervals. :eirker numerals are to be a minimum heicht of four inches. 1106Q bibs in pool area are to be equipped with vacuum breakers. There appears to be a leak in the pool piping, causing an excessive amount of make-up water to be added daily. This situation adds to the difficulty of maintaining the required chlorine residual of 0.4 parts per million and the required water clarity and an alkalinity of Iron Ji 7.2 to 8.4.