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Home My WebLink Aboutpitkin.eh.272929300005 (1996)_MEMO-7 -q -2f-3 oc9�, MEMORANDUM To: Suzanne Wolff, Planning Office From: Nancy MacKenzie, Environmental Health Officer V'\. 0 Through: Lee Cassin, Assistant Environmental Health Director 7d � C Date: January 8, 1996 Re: Benson Minor 1041 Hazard Review Parcel ID # 2729-293-00-005 The Aspen/ Pitkin Environmental Health Department has reviewed the details of the Benson application for an outparcel in Redstone Ranch Acres under the authority of the Pitkin County Land Use Code and has the following comments. ADEQUATE PROVISIONS FOR WATER NEEDS: Sections 2-17 and 3-1104: "It is the policy of the County to insure the availability of a water supply of adequate quality, quantity, pressure and dependability for fire protection and support of a proposed land use prior to approval of the use. The County shall require land uses to hook up to existing public systems if service is available." This Department needs adequate information on the quantity and the quality of water available. This can be done from tests of wells present on-site by a water engineer's or well driller's report. The applicant must ensure that the water quality is acceptable by having it tested by a lab such as the Snowmass Water and Sanitation District or Aspen Consolidated Sanitation District. Water of acceptable quality and quantity has been obtained in other lots in this area. Before a septic permit can be issued, the well must be drilled to assure that setback requirements from the well to the septic system can be maintained. Pitkin County Land Use Code requires that the well site be within the building envelope and this should not be a problem on this long 1.4 acre lot. It is recommended that low water landscaping (xeriscaping) be used and that the timing of any sprinkler systems be decreased for low water plants. The Colorado State University Cooperative Extension office can be contacted for more information on xeriscaping. Printed an Recycled Paper 1 V A condition of approval for this application is the receipt of information documenting that the location of the well meets setback requirements and can be placed within the building envelope and that quantity/quality of the well water are adequate. Without meeting these requirements a septic permit and building permit can not be issued. SEWAGE TREATMENT AND COLLECTION: Sections 2-18 and 3-1105: "It is the policy of the County to ensure that adequate sewage treatment facilities are available to serve existing and new developments. Public and private sewage disposal systems and connections to such systems shall comply with the sewage disposal guidelines of Pitkin County's Individual Sewage Disposal System Regulation." Lots in the area are served by individual septic systems. All such systems installed within Pitkin County require septic permits issued by the Environmental Health Department, and must comply with the County's septic regulations. To receive a septic permit, the applicant will need to submit a septic permit application and appropriate fee with a completed Soil Data Form including percolation test results and profile hole information. It must be possible to design an adequate septic system before a building permit can be issued. The Aspen/Pitkin Environmental Health Department will design the system for the applicant as part of the permit fee, if an engineered system is not required. We will do a site visit, advise the applicant about the best location for the system and provide a system design. We will determine if an engineered system is needed based on soil test results. An engineered system is required if any one of the following conditions occurs: a percolation rate faster than 5 mpi or slower than 60 mpi; maximum seasonal level of the groundwater table or bedrock less than four feet below the bottom of the proposed absorption system; or a slope in excess of 30%. Prior to initiating any tests at the site, the applicant should contact this office. We believe it will be possible to install either a conventional or an engineered septic system on this lot based on the data in the geological report submitted by Nicholas Lampiris, after studying the survey maps, and based on percolation test results in the general vicinity. Due to high ground water in that area it is possible that an engineer designed system will be required. Mr. Benson will need to adhere to minimum horizontal setback requirements for placement of septic system components which can be difficult on this shaped lot (long and narrow) and it may be difficult to locate the sewage disposal within the building envelope. As a guideline, a 4 bedroom house having between 2,000-6,000 sq ft of living space in an area where the soils have an average percolation rate (30 mpi), the required size of the leach field would be 1534 sq ft and the required setback distance from any Printed on Recyded Paper 2 wells would be 132 ft. It is desirable to locate the system below the house so that the system can operate by gravity. The area for the leach field should be located in an area of no traffic, planted with dry land grass, and should not be watered. The applicant should refer to the Pitkin County Sewage Regulations for detailed information, or call our office to discuss this site. The application mentions that this lot is an irrigated pasture. Any ditches on-site could pose a problem. Water drainage from the ditch could impair the functioning of the septic system by overloading and saturating the soils. This would severely impair the soil's ability to absorb and filter water of the septic system. Percolation test holes should be dug below the ditch in the area of the proposed leach field. If water from the ditch is found to be collecting in these holes then measures must be taken. These measures include but are not limited to culverting the ditch or creating diversion swales to move the water away from the septic system. The system must be located at least fifty feet away from the ditch to adhere to Pitkin County Code. This site might pose some difficulty in placing the system away from hazards due to the slope of the site. The first consideration is water drainage from runoff could impair the functioning of the septic system by overloading and saturating the soils. This would severely impair the soil's function to absorb and filter water from the septic system. Percolation tests could be done during runoff in the area of the proposed leach field. Measures to mitigate water drainage could include but are not limited to culverting or creating diversion swales to move the water away from the septic system. Unless designed by a registered professional engineer and approved by this Department, no soil absorption system shall be permitted in areas where the ground slope is in excess of thirty percent (30%). A condition of approval for this application is the receipt and approval of the septic permit by the Environmental Health Department before a building permit can be issued. WATER QUALITY IMPACTS: Sections 2-14 and 3-705 and 3-710: "It is the policy of the County to preserve and protect its present water resources. To this end it is the policy of the County that no land use be initiated which would adversely affect the quantity, quality, or accessibility of the County's water resources; or which would occur at the expense of established water -dependent agricultural activities; or which would result in increased salinization of water resources, loss of minimum stream flows, further destruction of wildlife habitat, or major expenditures to reacquire or redistribute major water resources. It is also the policy of the County to maintain a natural vegetative buffer along its surface waters such that the surface and groundwaters of the area are not encroached upon by land uses or other human activities which could cause deterioration of water quality or impair the natural treatment processes provided by meadows and wetlands." Printed on Recycled Paper 3 The Environmental Health Department will be addressing water quality impacts on down stream water quality. This application is not expected to impact down stream water quality if the minimum horizontal distances between components of the system and physical features are in accordance with the Pitkin County Sewage Regulations. A condition of approval for this application is: NONE AIR QUALITY: Sections 2-13 and 3-602: "Only that development is permitted which will not contribute significantly to degradation of air quality in Pitkin County. Developments may not constitute an indirect or direct air pollution source under Federal, State or County regulations." This project is not expected to contribute significantly to degradation of air quality in Pitkin County. The applicant must file a fireplace/woodstove permit with the Environmental Health Department before the building permit will be issued. The less densely populated parts of the county like Redstone Ranch Acres may have two devices per building: a maximum of one wood burning fireplace and a second device which can be either a gas log fireplace or a certified woodstove. In addition, unlimited numbers of decorative gas appliances are allowed. Coal may not be burned in any device. No wood burning device may be installed in barns or agricultural buildings. A condition of approval for this application is the receipt and approval of the fireplace/woodstove permit by the Environmental Health Department before the building permit can be issued. CONFORMANCE WITH OTHER ENVIRONMENTAL HEALTH LAWS: Section 2-7: "it is the policy of the County to ensure that no use or development of land is permitted which is in violation of the laws of the County, the State of Colorado, or the United States of America." This Department is not aware of any issues of concern regarding other environmental health laws. 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