Initial Study MND - Sonoma County Agricultural Preservation and ...

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Taylor MountainINITIAL STUDY/MITIGATED NEGATIVE DECLARATION S95 – Use log causeways, armored crossings, or drainage lenses at seasonally wet areas (notidentified as wetlands) to minimize erosion and sediment impacts and provide all weatheraccess for trail users. S97 – Avoid new trail crossings over stream channels to the greatest extent feasible. Locatetrails on existing roads or trails wherever possible and appropriate. S98 – Locate new riparian/creek crossings on geomorphically stable sites (i.e., low slopes inchannel and banks) and construct to minimize, to the greatest extent possible, streambankand bed erosion.Implementation of these Master Plan standards and the following mitigation measure wouldreduce this potential impact to a less-than-significant level:6-1 Best Management Practices to minimize erosion during construction, as requiredby the Construction General Permit (CGP). (See Section B.3.6, Geology, for fulltext of this measure.)b. Would the project substantially deplete groundwater supplies or interfere substantiallywith groundwater recharge such that there would be a net deficit in aquifer volume or alowering of the local groundwater table level?LESS THAN SIGNIFICANT. As stated in the setting, the project area is identified as a MarginalGroundwater Availability Area in the Sonoma County General Plan 2020. As noted in Item (a),development of staging areas and allowed visitor facilities would not substantially increase theamount of impervious surfaces, as parking areas would be maintained with permeable surfacesto the extent feasible. Also, stormwater runoff would be contained onsite through LIDfeatures. Therefore, the project would not interfere with groundwater recharge on this 1100acre property.Onsite water sources would be used for low-level recreational uses, but this would notsubstantially deplete groundwater supplies as these uses generally require low amounts ofwater. The Master Plan sets guidelines and standards for water supply development at thevarious staging areas. Proposed water sources include existing onsite springs, wells and/or apotential new well at one or more of the staging areas. The existing springs at the KawanaSprings Resort area was used in the past for previous residential and commercial recreationaluses. This source would be used for potable water, which will require a State water systempermit. The springs at Petaluma Hill Road staging area could be used as a water supply forrestrooms.Estimated peak water demand at full build out of the Kawana Springs Resort area would beapproximately 12 Equivalent Single Family Dwellings (ESD) (Cleveland, 2012). This estimate ofwater requirements includes 4 ESDs for the 8-room hotel/B & B, 2 ESDs for the café, 4 ESDs forthe campground and host site, and 2 ESDs for day use and special events. The estimated peakwater demand at the Petaluma Hill Road trailhead restroom would be less than 1 ESD. The Cityof Santa Rosa uses 110,000 gallons per year per ESD. New buildings would be subject to theCALGreen requirements regarding water use, efficiency and conservation. Landscaping wouldFinal B-84 September 2012
Taylor MountainINITIAL STUDY/MITIGATED NEGATIVE DECLARATIONcomply with the County Water Efficient Landscape Ordinance and utilize native plants thatrequire low amounts of water, which will help minimize onsite water demand. If testing of thesprings determines that supplies are insufficient to meet this demand, a new well may bedeveloped. Given the presence of springs and associated wetlands, and historic water use, thelow level demand for this 1,100-acre property would not result in a substantial depletion ofgroundwater supplies.c. Would the project substantially alter the existing drainage pattern of the site or area,including through the alteration of the course of a stream or river, in a manner whichwould result in substantial erosion or siltation on or off site?LESS THAN SIGNIFICANT. As described in the setting section, Colgan Creek and severalintermittent streams flow through the Taylor Mountain property. None of the proposedimprovements would substantially alter the drainage patterns of the site. Master Plan erosionand sedimentation guidelines and standards noted in Item (a) would ensure that erosion andsiltation are minimized. Stabilizing creek crossings, likely through armoring, would help tomaintain the integrity of the drainage courses, and thereby not alter the drainage patterns orcreate additional runoff or flooding. In addition, staging area development will be required tocomply with MS4 LID requirements and Construction General Permit program and pollutioncontrol regulations. The project will also comply with regulations by preparing andimplementing a Stormwater Pollution Prevention Plan (SWPPP) that includes detailed erosionand sedimentation controls and BMPs for controlling stormwater runoff (Master Plan Standard141). Compliance with these requirements is emphasized in Master Plan Standards S141 andS151.d. Would the project substantially alter the existing drainage pattern of the site or area,including through the alteration of the course of a stream or river, or substantiallyincrease the rate or amount of surface runoff in a manner that would result in flooding onor off site?LESS THAN SIGNIFICANT. See Items (a) and (c). Implementation of the Master Plan would notresult in substantial alterations of the site’s existing drainage patterns and would not contributeto flooding on or off site.e. Would the project create or contribute runoff water which would exceed the capacity ofexisting or planned stormwater drainage systems to provide substantial additionalsources of polluted runoff?LESS THAN SIGNIFICANT. Development of staging areas and allowed uses in the Master Planwould incorporate design features to contain and filter runoff onsite, through the use of LIDfeatures. The Master Plan includes additional guidelines to minimize runoff such as the use ofpermeable surfaces. Therefore, the proposed project would not create runoff that exceedsstormwater drainage system capacity or substantially increases pollutant loads.September 2012 B-85 Final
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Initial Study MND - Sonoma County Agricultural Preservation and ...

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