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Cf Mr. Dave Olmstead -3- February 2, 1982 Have there been any leachfield failures, or leach line additions/ repairs within the immediate area? Have any leachfield lines con- structed within the immediate area intercepted the water table? Do you anticipate that seepage from the earth-lined canal during the irrigation (summer) period will affect the leachfields of the lots adjacent to this canal? Have you investigated any alternative methods of sewage disposal other than individual septic tanks and leachfields? Are you aware of the recommendations submitted to the San Joaquin County Planning Department by Stan Phillipe of the Regional Water Quality Control Board (letter dated May 5, 1981) stating that further development not be allowed, "until sufficient information regarding local soil and groundwater conditions is available to judge the area's capability to successfully handle the added wastes". Do you feel you have adequately documented these conditions for Los Ranchos Estates? The Larch-Clover Area in Tracy is being studied with the aid of State and Federal funds to determine if a pollution problem has evolved due to the density of septic tanks, high groundwater conditions and impervious nature of the clay soils. Other than the fact that this area has been in existance longer than the Santos Ranch Development, do you feel that there are any site conditions significantly different between these two locations. Have you investigated the costs involved in rectifying a pollution problem of a serious nature, that may evolve 5, 10, or 20 years after initial development? IV. Storm Drainage System Are there any existing irrigation pipelines crossing the Los Ranchos Estates site, and if so are they located on your drawings? Have you prepared drawings illustrating a community drainage system to convey excess water off individual properties to a storm pond. Have you taken any action to establish a County Service Area for the drain- age system maintenance and operation. During recent heavy rains there was no flooding of individual residences, or overtopping of the storm pond at Currier Estates, however, numerous residents with individual drainage basins suffered flood damage. Public Works Department files will be requested as evidence of exist- ing drainage problems created by individual drainage ponds at the next Planning Department hearing, documenting several years of record. What assurances can you give to residents downgradient of the proposed development that sheet flow (overland) drainage will not be transferred off the project site, as new residents fill in, or otherwise disrupt the planned drainage scheme?