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

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Taylor MountainINITIAL STUDY/MITIGATED NEGATIVE DECLARATIONBAAQMD does not have an adopted threshold of significance for construction-related GHGemissions. However, lead agencies should disclose GHG emissions that would occur duringconstruction, and make a determination on the significance of these construction-generatedGHG emission impacts in relation to meeting AB 32 GHG reduction goals.a. Would the project conflict with or obstruct implementation of the applicable air qualityplan?NO IMPACT. Development allowed in the Master Plan would not interfere with or obstructimplementation of any applicable air quality plans. While the proposed park improvementswould result in nominal construction and operation (vehicle) emissions, overall emissionswould have a negligible effect on criteria pollutants because of the low level of overalldevelopment and phasing of the construction activities over several years.The Clean Air Plan includes a series of transportation control measures (TCMs) that aredesigned to achieve air quality standards. The Master Plan incorporates many of thesemeasures by addressing bicycle and pedestrian access, increasing vehicle accessibility fromdifferent parts of the project area and providing an open space area close to urban centers,thereby reducing vehicle miles traveled for recreation experiences.b. Would the project violate any air quality standard or contribute substantially to anexisting or projected air quality violation?LESS THAN SIGNIFICANT WITH MITIGATION INCORPORATED. In the long-term, the projectwould not violate any air quality standard or contribute substantially to an existing or projectedair quality violation. No permanent stationary sources of emissions 3 would be associated withimplementation of the Master Plan. Temporary use of a small generator for a mobile foodvendor at one of the staging areas would not create emissions in violation of any air qualitystandard.During the construction period, limited grading of the staging areas and access driveways wouldresult in increased dust from travel on unpaved surfaces and from site earthwork, resulting inPM 10 emissions. Vehicle and equipment exhaust emissions would also increase duringconstruction (e.g., ozone precursors [volatile organic compounds or VOC and NOx], CO andPM 10 and PM 2.5 ). Heavy-duty diesel and gasoline-powered construction equipment at the worksites would likely include loaders, graders, backhoes, and numerous trucks for lifts, delivery, waterand crew. However, implementation of Mitigation Measure 3-1 (see below) would reducepotential impacts of grading and use of construction vehicles and equipment to a less-thansignificantlevel. These measures are consistent with BAAQMD recommendations for allconstruction projects.3A stationary source consists of a single emission source with an identified emission point, such as a stack at afacility. Major stationary sources are typically associated with industrial processes, such as refineries or powerplants. Minor stationary sources are typically land uses that may require air district permits, such as gasolinedispensing stations, and dry cleaning establishments (BAAQMD, 2011).Final B-38 September 2012
Taylor MountainINITIAL STUDY/MITIGATED NEGATIVE DECLARATIONDuring operations, the primary emissions would be from vehicle trips. The Preserve wouldgenerate an estimated daily total of 378 vehicle trips on weekdays and 640 trips on weekenddays in the near term, and 739 trips on weekdays and 1022 trips on weekend days at fullbuildout of the Master Plan. Regional air quality plans anticipate and allow for population andinfrastructure growth in the region. Furthermore, these vehicle trips would not necessarily benew trips added to the region. It is likely that many future park users currently travel by vehicleto other recreational destinations within the county. This level of vehicle activity would notresult in any violations of air quality standards or contribute substantially to an existing orprojected violation.To confirm that there is no potential for a significant impact, the BAAQMD screening criteria(BAAQMD, 2011) were reviewed. Although a regional park is not listed in the criteria, a similaruse is City Park, which would likely involve a higher intensity and density of development thanthe Taylor Mountain Preserve. The proposed project falls well below the City Park screeningcriteria of 67 acres of park construction and 2,600 acres of park operations.3-1 The following measures shall be implemented during grading and construction:Water all active construction areas at least twice daily.Cover all trucks hauling soil, gravel, crushed rock and/or other loose materials, orrequire trucks to maintain at least two feet of freeboard.Sweep daily (with water sweepers) all paved access roads, parking areas and stagingareas at construction sites.Sweep streets daily (with water sweepers) if visible soil material is carried onto adjacentpublic streets.Operate all construction vehicles and equipment with emission levels that meetcurrent air quality standards.Minimize idling times either by shutting equipment off when not in use or reducingthe maximum idling time to 5 minutes (as required by the California airborne toxicscontrol measure Title 13, Section 2485 of California Code of Regulations [CCR]).Clear signage shall be provided for construction workers at all access points.Limit vehicle speeds to 15 mph on unpaved surfaces.All roadways, driveways, and sidewalks to be paved shall be completed as soon aspossible. Building pads shall be laid as soon as possible after grading unless seedingor soil binders are used.Replant disturbed areas as quickly as possible, and always prior to the winter rains.Post a publicly-visible sign with the telephone number and person to contact atRegional Parks regarding dust complaints. This person shall respond and takecorrective action within 48 hours. The Air District‘s phone number shall also bevisible to ensure compliance with applicable regulations.September 2012 B-39 Final
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