Scope of the Program Environmental Impact Report Baseline ...
County of Napa
PROGRAM ENVIRONMENTAL IMPACT REPORT (EIR)
BASELINE DATA REPORT (MEA)
-SCOPE OF WORK -
Overview:
The purpose of this Program EIR Baseline Data Report (aka; Master Environmental Assessment), hereafter referred to as the Baseline Data Report, is to document and describe the existing environmental characteristics of the County of Napa. Specifically, the Baseline Data Report will provide the most current condition for the following resource topics: geology and soils; mineral and rock resources; climate and air quality; surface hydrology; groundwater hydrology; surface water quality; biological resources; energy consumption; noise; public health and safety; population and housing; land use, agricultural resources; transportation and circulation; visual and aesthetic resources; public facilities and services; and cultural resources (includes historical and archeological resources).
When completed, the Baseline Data Report will provide the existing conditions data required for a number of planning efforts, including, but not limited to, a Program EIR on the Conservation Regulation Update currently underway, a possible County General Plan update, various specific plan efforts, and certain site-specific project reviews. However, due to the unknown nature of potential future projects, additional site-specific baseline data collection efforts may be necessary.
Project Management and Coordination:
Successful completion of this project will rely on a high degree of internal and external coordination. Project management responsibilities shall therefore include project coordination, budget expenditure review, and monthly invoicing. Coordination with the County shall include regular weekly communication and updates with the County Project Manager. Monthly invoice statements will include a brief status report describing progress to date during the invoiced period including discussion of any key technical accomplishments or challenges and conformance with the production schedule. Project status meetings (up to 10) with the County Project Manager will be conducted to coordinate work, discuss data issues, assess progress, solve problems, and keep the project generally on track. These meetings shall have an agenda. A meeting summary outlining key decisions and necessary follow-up shall be prepared and distributed to the participants and the County Project Manager.
A specific subset of project management and coordination responsibilities shall be focused on development of the GIS database. Key tasks shall include the following:
1. development of a metadata template to ensure data integrity and track data processing;
2. establishment of protocols to document edits and updates;
3. definition in consultation with the County of appropriate mapping units;
4. creation in consultation with the County of report-size and wall-size map layouts;
5. coordination with County GIS staff;
6. development of an appropriate attribute data database; and
7. manage digitizing, data transformation, and data processing.
To manage and conduct the GIS data processing and analysis for the BDR, it is assumed that data being supplied to the consultant already meets the county's metadata and mapping accuracy requirements. The consultant will not be editing or cleaning up existing supplied data. A key data resource to initiate several topics within the BDR is the LIDAR based DEM that the County will be supplying to the consultant. The delay of access to this information will delay the initiation and delivery of resource topic sections of the BDR that are dependent on this information.
Individual Resource Topics:
The specific information, data, deliverables, and the models and geographic evaluation areas to be used for each of the resource topics identified above is presented below.
I. Geology and Soils
Information Required: This section shall provide information on physiography, geology, soils, slope stability, and the seismic environment in Napa County with an emphasis on conditions and hazards that are likely to affect urban and agricultural development patterns. Specifically, data collection shall include the following major earth resource-related topics:
▪ Physical geographic features and their distribution;
▪ Slopes and their distribution
▪ Characteristics and geographic distributions of bedrock and near surface or “surficial” geologic units;
▪ Characteristics and geographic distributions of soil types;
▪ Nature and geographic distribution of geologic and soil-related hazards including severe erosion, expansive soils, settlement, landslides, earthflows, potentially unstable slopes, and land subsidence;
▪ Location and activity of known faults in Napa County and vicinity; and
▪ Seismic hazards including surface fault rupture, ground shaking, and earthquake-induced ground failures such as liquefaction, landslides, and earthflows.
Deliverables shall include a technical report with appropriate maps and graphics, both in hardcopy and on CD-ROM, of sufficient detail to illustrate the geographic distribution of the above-listed earth resources and related hazards and a summary suitable for use as the setting section in a Program EIR. The maps provided shall be at a scale of 1:24,000 and include, at a minimum, a Bedrock & Geologic Structure Map, a Surficial Deposits Map, a Landslides Map, a Faults Map, and a Dam/Levee Failure Inundation Map. Where available, Napa County’s Environmental Resource Maps shall be used as the base and starting point for further mapping. All information, data, and interpretations provided in this section shall be based entirely on published data and reports issued primarily by the U.S. Geological Survey, the Association of Bay Area Governments, the California Geological Survey, the Natural Resources Conservation Service, and Napa County. The compiling of existing data from disparate, site-specific sources not part of the Napa Co Environmental Resource Mapping System, such as project-level environmental studies, will not be undertaken. However, limited field work to spot check aerial photo analysis and resolve discrepancies between existing maps may be necessary.
Evaluation Areas (3):
▪ Napa Valley (Western Mtns, Carneros Area, Napa River Marshes, Jamieson/American Canyon, Napa Valley Floor, Angwin Area, & Eastern Mtns)
▪ Interior Valleys (Pope Valley, Central Interior Valleys, and Southern Interior Valleys)
▪ Berryessa/Knoxville Area
II. Mineral/Rock Resources
Information Required: This section shall involve the collection and integration of existing and disparate data on mines, quarries and other economic rock activities in Napa County. It shall identify the geographic distribution of known mineral and rock resources and provide a discussion of the importance of these resources at the state, county, and local levels. If sufficient information exists, a discussion addressing the economic, regulatory, and political feasibility of extracting mineral resources from areas that are not currently part of ongoing mining operations shall also be included.
Deliverables shall include a technical report with appropriate maps and graphics, both in hardcopy and on CD-ROM, and a summary suitable for use as the setting section in a Program EIR. Maps shall be at a scale of 1:24,000 and include at a minimum a Mines, Quarries & Known Rock/Mineral Resource Areas Map showing the geographic distribution of these resources and the location of existing mines and quarries. The information and maps presented shall be based primarily on published data, reports, and maps issued by the U.S. Geological Survey, the California Geological Survey, and the County of Napa, but shall also draw from personal communications/interviews with staff from these agencies. Collection of new data or the compiling of existing data from disparate, site-specific sources not in the files of the County, such as project-level environmental studies, will not be necessary to complete this task. However, limited fieldwork to spot check aerial photo interpretations and existing mappings may be required.
Evaluation Area (1):
▪ County (as a whole)
III. Climate and Air Quality
Information Required: This section shall provide an evaluation of the climatic conditions (temperature, wind, rainfall, humidity, inversions) that exist within Napa County and describe how topography and these factors potentially affect air quality. The collected climate data will be instrumental in developing the baseline hydrologic analysis. Climatic data in general and rainfall in particular will be assembled from many sources including, but not limited to, public sources (depending upon availability) such as the USGS, Napa Co RCD, Napa Co Airport, and NWS; and private sources such as private vineyard owners, and the Nexrain Corporation, (depending on availability and cost).
As the County is within the San Francisco Bay Area Air Basin (SFBAAB), and under the jurisdiction of the Bay Area Air Quality Management District (BAAQMD), applicable BAAQMD air quality rules, regulations, plans, policies, and significance criteria shall be summarized. In addition, local, state, and federal regulations relating to air quality shall be identified and summarized. A review and summary of existing climatic and air quality monitoring data from the California Air Resources Board and Bay Area Air Quality Management District monitoring stations in and near the County for the last three years shall be provided to characterize existing air quality conditions in the region. In addition, emissions from vehicular traffic along the major roadways in the County shall be calculated based on VMT and other traffic data (i.e., intersection V/C and LOS) provided by the County. The calculation of emissions from vehicular traffic shall be done using the EMFAC7Fcomputer model for localized CO modeling at up to 12 roadway segments and 4 intersections which will be selected based on the highest traffic data or highest probability for air quality exceedance. The most recent version of the Urbemis computer model for regional air quality modeling will be used. Particular attention shall be paid to particulate matter smaller than 10 microns in size (PM10) and diesel exhaust. However, site-specific diesel health risk assessments will not be performed. Identification of any areas that exceed state and/or federal standards shall be included. Fixed source and stationary source emissions, particularly dust from farming operations and active quarries, shall be estimated. The location of sensitive receptors (i.e., facilities that house persons who are particularly sensitive to air pollution such as hospitals, nursing homes, and schools) shall be mapped.
Deliverables shall include a technical report with appropriate maps and graphics, both in hardcopy and on a CD-ROM, and a summary suitable for use as the setting section in a Program EIR. Maps shall be at a scale of 1:12,000 and include, at a minimum, an accurate, updated, Isopleth Average Annual Rainfall and Meteorological Stations Map of the County, a Rainfall Intensities Map (2-, 10- & 100-Year Storms), an Ambient Air Quality Standards Excedence Map, and a Sensitive Receptors Map. The number of available data points and the accuracy of the data from those points shall determine the accuracy of the maps. No new field measurements or development of new field data will be undertaken.
Air Quality Models
▪ EMFAC7F
▪ Urbemis 2001 ()
Evaluation Areas:
Climate (10):
▪ Lower Napa Valley (Carneros, Napa River Marshes, & Jamieson/American Canyon)
▪ Napa Valley Floor
▪ Western Mountains
▪ Angwin/Livermore Ranch Area
▪ Eastern Mountains (excludes Angwin Area)
▪ Pope Valley (includes adjoining uplands)
▪ Central Interior Valleys (Chiles, Capel1, & Soda valleys and adjoining uplands)
▪ Southern Interior Valleys (Wooden & Gordon Valleys and adjoining uplands)
▪ Berryessa Area (includes adjoining uplands and subsidiary valleys to Berryessa Valley)
▪ Knoxville Area (includes Upper Putah Creek Area)
Air Quality-Air “Basins” (5):
▪ Lower Napa Valley (Carneros, Napa River Marshes, & Jamieson/American Canyon)
▪ Upper Napa Valley (Napa Valley Floor, Angwin Area, Eastern Mtns, & Western Mtns)
▪ Interior Valleys (Pope Valley, Central Interior Valleys, and Southern Interior Valleys)
▪ Berryessa Area (includes adjoining uplands and subsidiary valleys to Berryessa Valley)
▪ Knoxville Area (includes Upper Putah Creek Area)
Air Quality-Major Roads (9)
▪ State Highways
▪ Silverado Trail
▪ Petrified Forest Rd
▪ American Canyon Rd
▪ Flosden Rd
IV. Surface Hydrology
Introduction: The baseline surface hydrology, groundwater hydrology and water quality analysis will support several county programs including:
▪ Conservation Regulations: A more complete mapping and understanding of the County’s stream network identifying how stream classes and flow conditions relate to watershed characteristics.
▪ Environmental/CEQA Compliance: Hydrologic and water quality information to support programmatic level CEQA type analysis of countywide planning initiatives. The baseline data will be used to guide/support the assessment of direct/indirect hydrologic impacts, development of alternatives, and most importantly evaluation of cumulative impacts. Within a programmatic CEQA approach, such analyses will generally occur at watershed to drainage scales, not at the scale of an individual parcel or site.
A MIKE-SHE Surface Hydrology-Groundwater-Water Quality Model (MIKE-SHE ISGW) shall be developed and used to provide the required information. Necessary input data to develop the MIKE-SHE ISGW model will be collected as well as processed from other relevant supporting resource topics specified under this scope-of-work, including GIS-based information on: topography, geology, soils, temperature, evaporation, wind, precipitation, vegetation, land-use, population; etc.
In areas where existing data is limited additional metadata and information describing soil, vegetation, water quality and other characteristics can be sought within the proposed level of effort for the other tasks within the BDR. General scientific information, accepted standards, and interpolation/extrapolation of existing data may therefore be required to supplement existing data.
No new data will be generated to support the hydrological models. The DEM information provided by the County (both traditional aerial photo and LIDAR-based) will have adequate geographic coverage to support the hydrologic analysis. The supplied DEM data shall be “clean” in that it requires no additional post processing. Based on the available DEM, the Consultant shall delineate 100 drainages within the County. The drainage basin delineation shall be approved by County and after approval be used by Consultant in the further hydrological analysis. Because the LIDAR-based DEM information is so critical to initiate the hydrology work plan, its delay will in turn delay the hydrology work plan. To advance the completion of the project, the consultant team is committed to initiating all possible tasks that are not dependent upon this data. Excessive delays of the LIDAR data (several months) may require additional budgeting and scheduling to successfully accomplish project objectives.
It is very important that the data collection and processing carried out for other resource topics will support the hydrological analysis; therefore close coordination with other resource studies is anticipated and important.
As noted previously where existing data is not available best engineering judgment will be applied to provide the best input data for the models. The models will be calibrated to the extent possible, however it should be noted that the model in areas with sparse or no data will be less accurate. The baseline hydrologic analysis will be capable of supporting specific project impact assessments at the drainage scale. The baseline hydrologic analysis will provide a basis for more detailed project level impact assessments, but such assessments are beyond the current work plan.
Task1. Baseline Surface Hydrology Assessment
Approach: A basic MIKE-SHE model shall be developed to permit assessment of runoff characteristics for drainages within Napa County. Due to budget constraints at this time, this scope of work will provide runoff characteristics for 100 drainages to be selected by the County (in consultation with the Resource Conservation District and the Flood Control District). However, during the execution of the project, the consultant team and the County Project Manager will strive to identify other funds and look for cost-saving efficiencies in order to permit the assessment of runoff characteristics for the remaining 45 drainages within the County. The MIKE-SHE model will be developed to allow runoff assessment for all drainages irrespective of whether or not the consultant team conducts the assessment as part of this project.
Only major streams in each drainage basin will be included in the models surface drainage network. The MIKE-SHE model will utilize the existing MIKE 11 and HECRAS models previously developed for Napa County. Cross sections for major stream reaches not included in existing MIKE 11 or HECRAS models will, to the extent possible, be extracted from the DEM. Channel routing in minor streams will be accounted for in the conceptual description of the runoff processes (i.e., the MIKE-SHE routing parameters). Flow conditions at the outlet of each drainage area will be the reference point for the particular drainage. While the MIKE-SHE model will be capable of supporting more detailed evaluations at project-scales within the designated drainages, such analyses will not occur within the work-plan of the current BDR project.
The MIKE-SHE model relies on precipitation data as the primary driving force. Precipitation boundary conditions will be established from available point rainfall gage information, supplemented as needed and as available by NEXRAD distributed precipitation data. The distributed nature of the MIKE-SHE model will account for the spatial variations in watershed characteristics and forcing variables, such as rainfall and evapo-transpiration, to create a distributed simulated flow and water balance results at a finer detail than the observations allow.
Initially, time series from each river gauging station will be analyzed to identify to what extent they are subject to significant trends (based on climatic changes or watershed developments), and/or significant human activities such as regulated flow, storages (lakes/reservoir operations), diversions or discharges.
Stream flow gauging data shall be used as the primary basis for calibrating the model and ensuring correct water balance simulations. The period of record for calibration will be a recent continuous period no longer than fifteen (15) years in duration and preferably shall include average, dry, and wet year conditions. This will be reviewed by reviewing the records for their entire periods. County shall provide county wide design rainfall time series of the 2, 10, and 100 Year events. The consultant shall use the provided design rainfall without further pre-processing. The design events shall be simulated using average year conditions as initial conditions.
Next the model will be applied to produce annual and seasonal flow and water balances for each drainage area unit reflecting the spatial variation in characteristics. The water balance will be split into the following main components: rainfall, actual evaporation, infiltration and runoff components as well as storage volumes for each drainage area.
Simulation results will be used to establish GIS maps that spatially summarize flow characteristics and runoff/water balance conditions for each drainage area. Additionally, time series hydrographs, flow statistics, and other summary information will be produced at watershed and drainage scales.
Finally, runoff characteristics and possible trends for the 100 designated drainages will be related to water watershed conditions (soils, land uses, etc.). Assuming sufficient budget is identified, this task will be undertaken for the remaining 45 drainages.
Task 1 Information Required: Hydrological analysis will include seasonal and annual water balances (including water production/annual runoff), documentation of historic (1993) and current stream flows in the 2-, 10- and 100-year storms, and flow regime characterizations (perennial, seasonal, ephemeral). Finally, the regulatory setting guiding surface water management will be identified for use in the PEIR.
Task 1 Deliverables shall include a technical report indicating the results of the hydrology modeling for the County as a whole, and for each drainage evaluated with appropriate maps, time-series hydrographs characterizing runoff conditions and other graphics, gauge data, seasonal and annual water balances, and verification results, both in hardcopy and on CD-ROM, a summary suitable for use as the setting section in a Program EIR, and an integrated and calibrated surface water hydrologic model capable of evaluating hydrologic impacts on a drainage area basis. Time series of stream flow/ stream stage and maximum surface water profiles for the 2-, 10-, & 100-Year Storms. Low and high flow summary statistics for the period of record shall also be provided. Field inspection and the collection of new field data will not be undertaken.
Task 1 Surface Water Hydrology Model
▪ DHI MIKE-SHE Model
Task 1 Evaluation Areas (100-145)
▪ 100 individual drainages with the possibility of adding the remaining 45 drainages depending on funding availability
Task 2. Stream Network Classification Map:
A stream network and aquatic habitat map of Napa County shall be developed on the following three steps:
(1) A stream network map for 145 drainages shall be generated from the traditional aerial- and LIDAR- based DEMs supplied by the County. A GIS-based basin delineation and stream generation software package will be used to generate the stream network and drainage areas. Field verification and, if needed, GIS customization for particular watershed/drainage conditions will be conducted to ensure that the stream course map accurately portrays ‘on the ground’ conditions. Springs and other features will, to the greatest extent possible, be located and mapped.
(2) Results from the MIKE-SHE hydrologic model shall, to the greatest extent possible, be linked to the stream network. Since the MIKE-SHE model will not contain all streams contained in the stream network, classification of reaches of the smaller streams that are not simulated directly in MIKE-SHE will be based on interpolation of the model results and analysis of available hydrologic data. Data from the period simulated with MIKE-SHE will be evaluated to generate average-year, dry-year, and wet-year flow conditions in each of the selected 100 drainages (additional drainages will be added depending on funding availability). This analysis may be based on e.g. 25%, 50% and 75% fractions of yearly totals. Baseline stream network mapping will be considered preliminary until field sampling and verification confirm the results.
(3) A biologic data layer shall be used to overlay/filter the physical-hydrologic stream network in 100 drainages to determine the “class” of each stream under the County’s new stream classification system (additional drainages will be added depending on funding availability). Under this system, streams are classified according to their ecology, hydrology, and function, into streams that can potentially support: fish habitat (Class 1); non-fish vertebrate and/or benthic macro-invertebrate habitat (Class 2); actively intermittent/ephemeral channels (Class 3); or are constructed waterways (Class 4). Using the initial developed stream network map, Consultant will conduct a field-based sampling study relating watershed conditions to the 3 natural stream classes. Based on geographic, topographic, geologic, soil, and land-use parameters, representative stream segments (up to 45) from up to 6 representative drainages will be field evaluated. Based on this work a GIS map with the appropriate ecologic classification for County streams will be developed. Additional field verification will confirm the adequacy of the final stream network mapping.
Task 2 Deliverables shall include a at a minimum a technical report describing how the maps were generated and a Stream Network Map, a Stream Class Map, and a Stream Types and Base Flow Map, all at a scale of 1:6,000. Biological field inspections as specified above will be undertaken to complete this task.
Task 2 Stream Network Model
▪ DHI MIKE SHE Model
Task 2 Evaluation Areas (100-145)
▪ stream network mapping for 145 drainages
▪ average-year, dry-year, and wet-year flow conditions within 100 selected drainages (additional drainages will be added depending on funding availability)
▪ stream classification within 100 selected drainages (additional drainages will be added depending on funding availability)
V. Groundwater Hydrology
Approach: The groundwater analysis will adopt an approach based on the review, integration, and interpretation of existing data. Using all available well information (including groundwater table observations, pumping tests, and geological interpretations from other Resource Topics) a numerical groundwater model of Napa County shall be developed as a module incorporated into the existing MIKE-SHE model established under the Surface Hydrology Task. The resultant MIKE-SHE ISGW model shall be able to represent the subsurface domain (saturated zone) as a single or multi layered two-dimensional model depending on the geological and hydrogeological description. The final modeling approach will be defined during initial phases of the project when the conceptual model for the groundwater system is being developed. As a county wide model the groundwater part of the model will be most detailed in areas where the ground water resources is significant and important
The groundwater model shall be fully dynamically linked to the surface water system and the integrated system will incorporate all collected climatic, hydrologic and hydraulic data.
If existing groundwater models exist for study areas, these will be reviewed and incorporate any relevant information from these in the MIKE SHE ISGW model. It will be calibrated against time series of observed piezometric heads. The accuracy of the model will to a high extent be determined by the availability of data. The model will account for all significant extraction of ground water from available aquifer data.
Information Required: The model will assist in identifying critical areas in terms of resource availability from a quantitative and qualitative viewpoint, and identify recharge and discharge zones of the aquifer. This along with other available data collected shall be analyzed to delineate groundwater basins, map recharge areas, and identify groundwater deficit areas. The consultant shall based on collected data (ten year period) analyze existing well data to identify, where possible, longer-term trends (rising, falling, stable) in groundwater levels groundwater quality will be characterized from existing well data. The regulatory setting guiding groundwater management shall be identified for use in the PEIR.
Deliverables shall include a technical report with estimated groundwater usages, water balances, groundwater elevation trends, appropriate maps, and time-series graphs and, other graphics for each evaluation area, both in hardcopy and on CD-ROM, a summary suitable for use as the setting section in a Program EIR, and an integrated and calibrated groundwater model. Maps shall be at a scale of 1:12,000 and include at a minimum a Groundwater Basins/Recharge Areas Map showing well locations, groundwater flow patterns, recharge areas, discharge areas, and zones of influence, a Groundwater Elevations/Depths Map, and a Groundwater Short Areas Map. In addition time-series graphs of water level conditions and derived information shall be provided. Field inspection and the collection of new field data will not be undertaken.
Groundwater Model
▪ DHI MIKE SHE ISGW Model
Evaluation Areas: (11)
▪ Carneros Area
▪ Napa River Marshes
▪ Jameson/American Canyon
▪ Napa Valley Floor
▪ Western Mountains
▪ Eastern Mountains/Angwin Area/Livermore Ranch Area
▪ Pope Valley (includes adjoining uplands)
▪ Central Interior Valleys (Chiles, Capel1, & Soda valleys and adjoining uplands)
▪ Southern Interior Valleys (Wooden & Gordon Valleys and adjoining uplands)
▪ Berryessa Area (includes adjoining uplands and subsidiary valleys to Berryessa Valley)
▪ Knoxville Area (includes Upper Putah Creek Area)
VI. Surface Water Quality
Information Required: Existing and past (1993) surface water quality conditions shall l be assessed based on available information. Where possible the water quality analysis will make use of existing and available water quality information from the on-going TMDL process, Napa nutrient analyses, and other studies. Same data will form the basis for computing watershed loadings (taking into account land uses) to streams. Loadings will be assessed using a GIS-based non-point calculation tool. Different types of land use have different run-off concentrations of nutrients, organic matter, and bacteria. Predominant land uses includes; residential, commercial, industrial, mixed (variety of land uses), transportation, open space, forest, wetlands and agriculture. These run-off concentrations are often refereed to as the land use Estimated Mean Concentration (EMC). The pollution load from agricultural activity most dominantly the use of fertilizer and domestic animals is included in the non-point pollution load estimation. The GIS tool will also link point sources and provide a first screening level of assessment of the combined pollutant loadings. The GIS tool shall be applied to estimate the total load from the housing in the rural areas, taking the local treatment system efficiencies into account.
Potential sediment loadings (both coarse & fine) arising from soil erosion shall be analyzed based on available information about topography, soils, vegetation, land use and rainfall. The analysis will be a combination of GIS based soil erosion modeling and evaluation of existing data. The soil source erosion assessment will be applied to describe delivery index and sediment yield (ton sediment /acre/year) for all drainages. These soil erosion rates will be applied as loadings to an in-stream sediment transport model that is fully integrated with the MIKE SHE model developed. The river sediment transport model (including the main stem Napa River and major tributaries in the Napa River Watershed only) will transport sediment as suspended sediment or as bedload. The model will predict areas prone to sedimentation and erosion and predict total loadings from the watershed to the Bay.
The established MIKE SHE surface hydrology water model shall be coupled to the GIS based pollutant load model and extended for in-stream water quality (not sediment) simulations. The resultant MIKE SHE In-Stream Water Quality model simulates the transport and fate of the following pollutants, each of which shall be determined:
▪ Temperature;
▪ Nitrate;
▪ Total Phosphorus; and
▪ Coliforms (e.g., E.coli).
The dynamic coupling between the loading model and water quality modeling will provide a tool for analyzing current water quality conditions and assess (cumulative) impacts of water quality following future land use changes in the watershed. Where existing water quality data is sparse or not available best engineering judgment will be applied to provide the best-input data for the models. The models will be calibrated to the extent possible, however it should be noted that the model in areas with sparse or no data will be less accurate. For impact analysis (i.e., comparison between baseline and scenario) the model will be fully applicable.
Regulatory requirements guiding water quality management in the County shall be identified for the setting section of the PEIR.
Deliverables shall include a technical report with appropriate maps and graphics, both in hardcopy and on CD-ROM, a summary suitable for use as the setting section in a Program EIR, and integrated and calibrated soil erosion, pollutant load, and in-stream water quality models. Maps shall be at a scale of 1:12,000 and include, at a minimum, Surface Water Pollutant Level Maps for Temperature, Nutrients, Organic Material, and Pathogens and a Sediment Source Map.
Surface Water Quality Models
▪ DHI MIKE SHE-Soil Erosion Module (SEAGIS)
▪ DHI MIKE 11-Water Quality Module
Evaluation Areas: (100-145)
▪ 100 drainage areas with the possibility of adding the remaining 45 drainages depending on funding availability
VII. Biological Resources
Information Required: A review of existing biological information including unpublished information in the files of the County, resource agencies (e.g., the California Department of Fish and Game, U.S. Fish and Wildlife Service, U.S. Army Corps of Engineers), and other knowledgeable individuals (e.g., staff at the cited agencies, the local chapter of California Native Plant Society) shall be provided. This review shall integrate information from aerial photographs and reconnaissance-level fieldwork to prepare detailed biological resource maps of the County. A description of the biotic communities and the critical habitat areas on the biological map shall be included. The role fire plays in the biotic communities identified shall be discussed along with fuel loading and the implications of various management strategies on fuel management and public safety. The critical habitat areas shall be used to recommend locations where focused surveys for special status species may be required. A table that includes a list of rare, threatened, endangered, or other special-status species that exist or may exist in the County shall also be provided. Common species and habitats shall also be discussed. Spot field checks shall be performed and wildlife species associated with each major habitat type shall be identified. Where a species only occurs or has an obligate need for one habitat type this fact shall be noted. Endangered and indicator wildlife species shall be identified and population trends for these species shall be discussed. Existing data shall be reviewed (including historic photos, if available) to summarize changes in biological resources throughout the County.
The following 4 tasks shall be performed:
Task 1. Refine Methods, Gather Background Information and Coordinate with Resource Agencies: Obtain and review existing and available information that pertains to biological resources in the County. This shall include a review of records from the California Department of Fish and Game Natural Diversity Database (CNDDB 2003), Napa County Environmental Resources Mapping System, Wetland Inventory Maps, environmental documents prepared for projects in the region, and literature. This information shall be used to develop draft lists of special-status species and other sensitive biological resources (e.g., wetlands, streams, and riparian communities) that have the potential to occur in the County. These draft lists will be used to refine the biological resources maps (Task 2) and the reconnaissance-level field surveys (Task 3). Work shall be coordinated with resource agencies and other knowledgeable individuals to obtain additional information on populations and occurrences of special-status species in the County. A draft overview of the methods that will be used to identify biological resources known to occur or potentially occur in the County and a draft discussion of county, state, and federal policies and regulations that influence biological resources shall be provided; revised versions of these deliverables will be incorporated into the draft technical report (Task 4). These early draft documents will be submitted to the County electronically.
Task 2. Prepare Draft Biological Resources Maps: Draft biological resource maps shall be prepared in ArcGIS 8.x for County staff review. Draft maps will be provided digitally on a CD ROM. These maps shall contain the following data:
• biotic communities of the County;
• known locations and habitats of special-status species in the County;
• known or suspected wildlife corridors in the County; and
• critical habitat areas
Known or suspected wildlife corridors shall be mapped based on data from a recent report on wildlife corridors of statewide importance (report is available on-line at pubs/reports/linkages/index.htm) and observations of local experts. “Critical habitat areas” defined as follows shall be mapped based on County GIS database supplemented with aerial photo review, CNDDB data, and discussions with local experts and County staff.
“Critical habitat areas” are areas that could only be developed with substantial mitigation due to stringent regulatory requirements, areas that will require special policies to protect important populations of rare or endangered species and their habitats, or areas that are critically important to the restoration and/or maintenance of native wildlife populations in the County.
Critical habitat areas identified could be used by the County to identify areas where focused surveys for special status species are required.
Task 3. Conduct Reconnaissance-Level Survey: A field survey from publicly accessible roads (or locations that the County will provide access to) to spot-check baseline conditions within the County shall be conducted for the purpose of:
• ground-truthing the draft biological resources maps;
• determining if suitable habitat is present for special-status species that was not identifiable from aerial photos; and
• assessing existing conditions to verify some of the identified critical habitat areas.
This task shall be coordinated where possible with the fieldwork required under the Task IV Surface Hydrology.
Task 4. Prepare Final Biological Resource Maps: The draft biological resource maps shall be revised based on County staff comments and the field visits undertaken. The 11”x17” report maps shall be provided to the County as camera-ready to be included in the future County documents. A CD-ROM of the GIS database files shall also be provided so the County can integrate this data into its GIS database.
Deliverables: shall include one draft and final hard copy and 10 CD ROMs of a technical report with appropriate summary maps, tables, and graphics, and a summary description of biological resources suitable for use as the setting section in a Program EIR. The technical report will include a discussion of general habitat descriptions, species assemblages and critical and rare habitats by evaluation area. In addition, information on special status plants and wildlife shall be presented on a County-wide basis in tables in a format acceptable to the County. Summary maps (11”X17”) of the County, and where necessary of the 13 evaluation areas (see below), will also be provided in the draft and final technical report. The final technical report will include a digital atlas on the CD-ROMs at a scale of 1:12,000 (i.e., 1 inch = 1,000 feet) and include at a minimum: a Rare/Endangered/Threatened Plant Sites & Distributions Map, a Rare/Endangered/Threatened Plant Habitats Map, a Rare/Endangered/Threatened Animal Locations Map, a Rare/Endangered/Threatened Animal Habitats Map, a Critical Habitats Map, and a Wildlife Movement Corridors/Migration Routes Map.
Where available Napa County’s Environmental Resource Maps shall be used as the base and starting point for further mapping. Fieldwork commencing in early November 2004 and the collection of new field data shall be undertaken to complete this task but neither presence/absence nor protocol-level surveys for special-status species shall be conducted. Moreover, the project shall not include mapping or descriptions of resources within the incorporated cities within the County.
Evaluation Areas: (13)
▪ Carneros Area
▪ Napa River Marshes
▪ Jameson/American Canyon-Unincorporated (excludes American Canyon)
▪ Napa Valley Floor-Unincorporated (excludes Napa, Yountville, St Helena, & Calistoga)
▪ Towns & Cities (includes American Canyon, Napa, Yountville, St Helena, & Calistoga)
▪ Western Mountains-Unincorporated (excludes Napa, & Calistoga)
▪ Angwin/Livermore Ranch Area
▪ Eastern Mountains (excludes Angwin Area)
▪ Pope Valley (includes adjoining uplands)
▪ Central Interior Valleys (Chiles, Capel1, & Soda valleys and adjoining uplands)
▪ Southern Interior Valleys (Wooden & Gordon Valleys and adjoining uplands)
▪ Berryessa Area (includes adjoining uplands and subsidiary valleys to Berryessa Valley)
▪ Knoxville Area (includes Upper Putah Creek Area)
Key Assumptions:
▪ County will provide 2002/2003 color ortho-rectified aerial photographs of the County to the consultant team on CD-ROM by February 2004.
▪ The 2002/2003 color ortho-rectified aerial photographs of the County will support mapping at a scale of 1:12,000.
▪ The mapped scale of existing data will be limited to the scale of the source data or the limitations of the fieldwork.
▪ County will provide the consultant team with a single set of comments on draft work products.
▪ The consultant team will provide early draft documents associated with Tasks 1 and 2 in an electronic format. Moreover, the consultant team will provide one draft and one final technical report in both electronic and hard copy format. Consultant team assumes one round of internal revisions based on comments from County staff
▪ County will make all of their relevant existing GIS data and all meta data that currently exists available to the consultant team for incorporation into the technical report.
VIII. Energy Consumption
Information Required: Existing electricity and natural gas consumption and peak demand shall be identified through contact with PG&E. Electricity and natural gas consumption and peak demand generated by approved but as yet unbuilt residential development in the County shall also be estimated using development plans (with estimates of the number of unit additions included) and the average energy usage rates for the area. Yearly total energy consumption shall also be calculated in terms of British Thermal Units (BTUs) and barrel-of-oil equivalents. Transmission capacity of existing and planned regional electricity infrastructure shall be identified through contact with PG&E and discussed with respect to regional load requirements. Existing vehicle energy consumption shall also be estimated based on VMT estimates developed from the traffic information generated under Task XVI-Traffic & Circulation below. Vehicle energy consumption shall be reported in terms of BTUs and barrel-of-oil equivalents.
Deliverables shall include a technical report with appropriate maps and graphics both in hardcopy and on a CD-ROM and a summary suitable for use as the setting section of a Program EIR. Maps provided shall be at a 1:12,000 scale and include at a minimum a Regional Electric Transmission & Natural Gas Distribution System Map. Field inspection and the collection of new field data shall not be undertaken.
Evaluation Areas: (3)
▪ Napa Valley (Western Mtns, Carneros Area, Napa River Marshes, Jamieson/American Canyon, Napa Valley Floor, Angwin Area, & Eastern Mtns)
▪ Interior Valleys (Pope Valley, Central Interior Valleys, and Southern Interior Valleys)
▪ Berryessa/Knoxville Area
IX. Noise
Information Required: Relevant local, state, and federal regulations relating to noise shall be identified and summarized. Existing noise conditions near major noise sources such as roadways, trains, quarries, and industrial noise sources will be characterized with continuous unattended 24-hour sound level measurements. In addition short-term (15 to 20 minute) measurements will be taken near major noise sources during daytime hours at up to 20 representative locations. The County in consultation with Jones & Stokes will identify all short-term and long-term monitoring locations. Noise from aircraft activities at the Napa County Airport will be characterized using the noise contour mapping recently prepared by the airport. Contours for existing conditions will be prepared based on the results from the monitoring study described above, noise modeling, and information from previous studies. For mobile noise sources, contours shall be prepared for state routes, major county roads, and other major roads identified in the Transportation and Circulation section. Noise modeling and contours shall be prepared using traffic data generated under Task XVI-Traffic & Circulation below and the FWHA Traffic Noise Prediction Model (FHWA-RD-77-108). The location of sensitive noise receptors shall be generally described based on land use data provided under Task XII-Land Use including residences, parks, hospitals, and schools. The noise metric used shall be Day-Night Noise Level (Ldn). Noise contours shall be presented in 5 dB intervals from 55 dB to 80 dB or a range most appropriate for the type of noise source (e.g., traffic, airplane, etc.).
Deliverables shall include a technical report with appropriate maps and graphics, both in hardcopy and on a CD-ROM, and a summary suitable for use as the setting section in a Program EIR. Maps provided shall be at a scale of 1:12,000 and include at a minimum a Traffic/Airport/Other Fixed Source Noise Contour Map and a Sensitive Receptor Map. A field investigation and the collection of new field data as described above will be undertaken to complete this task.
Noise Model
▪ FWHA Traffic Noise Prediction Model (FHWA-RD-77-108)
Evaluation Areas: (3)
▪ Napa Valley (Western Mtns, Carneros Area, Napa River Marshes, Jamieson/American Canyon, Napa Valley Floor, Angwin Area, & Eastern Mtns)
▪ Interior Valleys (Pope Valley, Central Interior Valleys, and Southern Interior Valleys)
▪ Berryessa/Knoxville Area
X. Public Health and Safety
Information Required: Existing public safety hazards within the County shall be identified. The primary public safety concerns addressed shall include man-made hazards (accidents, crime, and hazardous materials spills) and natural events (earthquakes, wildland fires, and flooding). Information about flood and wildland fire hazards shall be compiled based on existing mappings. Existing information about these and the other risks listed shall be reviewed and organized in the form of a textual document, tables, and associated appendices. Seismically-related hazards shall be addressed in the geology and soils section; however, the findings shall be cross-referenced here. Any existing emergency response plans and the escape routes and evacuation centers to be used in the event of an emergency that may be included in those plans shall be indicated.
Deliverables shall include a technical report with appropriate maps and graphics, both in hardcopy and on a CD-ROM, and a summary suitable for use as the setting section in a Program EIR. Maps provided shall be at a scale of 1:12,000 and include, at a minimum, a Flood Hazard Severity Map, a Fire Hazard Severity/Fire Corridor Map, an Earthquake Hazards Severity Map, a Traffic Accidents Map, and a Contaminated Sites Map. Where available, Napa County’s Environmental Resource Maps shall be used as the base and starting point for further mapping. Field inspection and the collection of new field data will not be undertaken. Moreover, this section need not include a full County-wide Human Health Risk Assessment. It shall include, however, the results from gathering and analyzing the most current county-wide health statistics and a summary of documented contaminated sites, such as contaminated groundwater plumes, and an evaluation of the risk they pose to individuals due to their proximity to sensitive receptors.
Evaluation Areas: (5)
▪ Napa Valley Floor/Carneros/Napa River Marshes/Jamieson/American Canyon Area
▪ Western Mountains
▪ Eastern Mountains (excludes Angwin Area)
▪ Interior Valleys (Pope Valley, Central Interior Valleys, and Southern Interior Valleys)
▪ Berryessa/Knoxville Area
XI. Population and Housing
Information Required: This section shall include a detailed description of Napa County’s population and its characteristics, both demographic (race, age distribution, sex, & household size) and economic (median income and income range). The availability and affordability of the existing housing stock shall also be described. Growth trends within the County shall be indicated. Current employment figures and trends shall be assessed, employment by industry sector shall be indicated, and in and out commute shall be quantified based on available 2000 Census information. Permanent and seasonal farm labor employment shall be specifically called out. Economically-driven estimates of future population levels and characteristics shall be provided based on the average population per household per employed person. Housing availability for each income class shall be determined based on planned housing densities, and the County’s and cities growth management restrictions, as well as the County’s adopted Housing Element.
County/city planning staff shall be consulted to evaluate the availability, and affordability of the existing housing stock throughout Napa County. County/city planning staff shall also be consulted to determine the projected buildout number of dwelling units based on the amount of undeveloped land, zoning, and growth management restrictions.
Deliverables shall include an explanatory narrative with appropriate tables and graphics, both in hardcopy and on CD-ROM, suitable for use as the setting section in a Program EIR. . Maps provided shall be at a scale of 1:24,000 and include, at a minimum, a Current Demographics Map, a Historic Demographics Map, a Current Economic Conditions Map, and a Historic Economic Conditions Map. Field inspection and the collection of new field data will not be undertaken.
Evaluation Areas: (12)
▪ American Canyon
▪ Napa
▪ Yountville
▪ St Helena
▪ Calistoga
▪ Carneros/Napa River Marshes/Jamieson/American Canyon-Unincorporated
▪ Napa Valley Floor-Unincorporated/Western Mountains Area
▪ Livermore Ranch/Pope Valley/Knoxville Area
▪ Angwin Area (includes Deer Park)
▪ Eastern Mountains-Unincorporated (excludes St Helena)/Central Interior Valleys Area
▪ Southern Interior Valleys (Wooden & Gordon Valleys and adjoining uplands)
▪ Berryessa Area (includes adjoining uplands and subsidiary valleys to Berryessa Valley)
XII. Land Use
Information Required: This section shall describe existing land use patterns and growth trends in the County as a whole and for each evaluation area. A narrative discussion of the existing land uses shall be provided for the County as a whole and the respective evaluation areas. Major categories of existing land uses (i.e., residential, commercial, industrial, agriculture, wineries, mixed-use, vacant and open space) outside the cities shall be mapped using available information from the County, recent aerial photos, USGS information, existing maps, and focused fieldwork. Land use consumption trends by major use categories shall be compiled and analyzed. Existing or potential future land use conflicts shall be identified to provide a forum for analysis of future project’s compatibility with existing land uses. The information shall be provided in a format that allows for future impact analysis to be undertaken describing the aggregate changes from existing land use conditions and the implications of likely land use changes thereby allowing for the identification of potential conflicts that could arise from new land use patterns. The existing County General Plan shall be described and a discussion of other comprehensive and specific land use plans for surrounding communities and other agencies with influence on land use planning decisions shall be provided. The jurisdictional areas for each of the respective planning programs shall be mapped to provide a context for evaluation of future land use decisions within the County, and to provide a forum for analysis of a project’s consistency with plans and policies.
Deliverables shall include a technical report with appropriate maps and graphics, both in hardcopy and on CD-ROM, and a summary suitable for use as the setting section in a Program EIR. Maps provided shall be at a scale of 1:12,000 and include, at a minimum, a Current Land Use Map and a Planning Program Jurisdictions Map. Limited field work and the collection of new field data will be undertaken to complete this task.
Evaluation Areas: (12)
▪ American Canyon
▪ Napa
▪ Yountville
▪ St Helena
▪ Calistoga
▪ Carneros/Napa River Marshes/Jamieson/American Canyon-Unincorporated
▪ Napa Valley Floor-Unincorporated/Western Mountains Area
▪ Livermore Ranch/Pope Valley/Knoxville Area
▪ Angwin Area (includes Deer Park)
▪ Eastern Mountains-Unincorporated (excludes St Helena)/Central Interior Valleys Area
▪ Southern Interior Valleys (Wooden & Gordon Valleys and adjoining uplands)
▪ Berryessa Area (includes adjoining uplands and subsidiary valleys to Berryessa Valley)
XIII. Agricultural Resources
Information Required: This section shall describe the existing agricultural production and farmland conversion trends in the County as a whole and for each evaluation area. Existing farmlands and vineyards within the County shall be identified and mapped using available information from the County, recent aerial photos, Dept of Conservation information, existing maps, and focused fieldwork. The most recent Farmland Conversion Reports for Napa County, as well as information available on crops from the United State Department of Agriculture (USDA), shall be reviewed. A description of the State and County’s agricultural classification system shall be discussed, and agricultural suitability shall be identified and mapped for the evaluation areas within the County. The County Farm Advisor shall be contacted to identify current farmland use, as well as the Natural Resources Conservation Services, to help identify agricultural land suitability. Using data from the State Crop Reporting Services, and data supplied by the County Agricultural Commissioner, a discussion of the crop production value by crop type, as well as crop yields, as available shall be presented. A summary of agricultural soils shall be provided and mapped based on existing USDA Soil Surveys for the area. A description of the existing soil quality and classification, surrounding agricultural and non-agricultural uses, location with respect to agricultural preserves, historic crop production, and economic contribution to the County shall be discussed. The information shall be provided in a format that allows for future impact analysis to be undertaken describing the aggregate changes from existing agricultural conditions, and the suitability of future development and wine industry growth. A discussion of the implications of potential agricultural conversion shall be provided. Economically-driven projections of future agricultural development shall be provided.
Deliverables: shall include a technical report with appropriate maps and graphics, both in hardcopy and on CD-ROM, and a summary suitable for use as the setting section in a Program EIR. Maps provided shall be at a scale of 1:12,000 and include, at a minimum, an Existing Farmlands Map showing the extent of existing vineyards, orchards, and other croplands, a Prime Agricultural Soils (Potential Farmlands) Map, a Prime Grazing Lands Map and a Potential Vineyards Map. Where available, Napa County’s Environmental Resource Maps shall be used as the base and starting point for further mapping. Limited field-work and the collection of new field data will be undertaken to complete this task.
Evaluation Areas: (11)
▪ Lower Napa Valley (Carneros, Napa River Marshes, & Jamieson/American Canyon)
▪ Napa Valley Floor
▪ Western Mountains
▪ Livermore Ranch Area
▪ Angwin Area
▪ Eastern Mountains (excludes Angwin Area)
▪ Pope Valley/Central Interior Valley Area
▪ Central Interior Valleys (Chiles, Capel1, & Soda valleys and adjoining uplands)
▪ Southern Interior Valleys (Wooden & Gordon Valleys and adjoining uplands)
▪ Berryessa Area (includes adjoining uplands and subsidiary valleys to Berryessa Valley)
▪ Knoxville Area (includes Upper Putah Creek Area)
XIV. Transportation and Circulation
Information Required: This section shall inventory and describe the following transportation facilities and services:
▪ Roadways: An inventory of the roadways listed below shall be provided. The inventory shall include location, number of lanes, functional classification, Average Daily Traffic (ADT) volume and Peak Hour Traffic volume on the peak day of the week. Existing traffic data shall be collected and compiled. Supplemental data collection via traffic counts along key routes and at critical intersections at no more than 25 sites shall be undertaken to analyze Average Daily Traffic (ADT) volume and Peak Hour Traffic volume on the peak day of the week.. In addition, based on data availability:
• Historic trends in the County’s traffic and congestion levels shall be presented and discussed as well as seasonal variations;
• County and/or regional traffic forecasts for major highways and roadways shall be provided;
• Level of service analysis for highways and major roadways within the County shall be specified using. Critical Movement Analysis (CMA) for critical intersections and V/C ratios for road segments for peak day and hour unless the County’s Traffic Management Agency identifies an alternative preferred method of analysis;
• General adequacy of the County’s traffic circulation system shall be analyzed, which shall include general traffic flow and freight movement; and
• Improvements planned by the County, CalTrans, and local jurisdictions in their Transportation Improvement Plans shall be identified.
▪ Transit: An inventory of transit shall be provided that includes a map of transit route coverage and facility locations (facilities shall also be described in tabular form) in the unincorporated portions of the County, and a summary of transit service within the County. Service includes both fixed route service and specialized services such as para-transit. Additional assessment provided for transit shall include identification of gaps in transit coverage, and identification of improvements planned by local transit agencies in their Transportation Improvement Plans.
▪ Non-Motorized: An inventory of non-motorized facilities in the unincorporated County shall be provided that includes an identification of sidewalks along Principal and Minor Arterial roadways, as well as paved and unpaved paths and trails. Additional assessment of non-motorized conditions in the County shall include identification of gaps in the pedestrian and/or bicycle circulation system; description of areas where pedestrian/vehicular and pedestrian/bicycle conflict are known to occur; and identification of improvements planned by the County, State, and local jurisdictions in their Transportation Improvement Plans.
▪ Rail: An inventory of rail facilities shall be provided that includes location and identification of ownership of track, stations, and freight rail facilities. The type of service (freight or passenger) and frequency of trains shall also be identified.
▪ Airports: An inventory of airport facilities that provide service to the public shall be provided that includes location and identification of ownership. The type and frequency of air travel that originates from these facilities shall also be discussed.
▪ Traffic Calming: Traffic calming programs or policies implemented by the County or local cities, intended to improve traffic safety conditions in local neighborhoods, shall be identified and discussed. In addition, a discussion of the issues and potential approaches for traffic calming shall be provided.
▪ Transportation Demand Management (TDM) Programs: TDM programs or policies implemented by the County or local cities, intended to improve the efficiency of the transportation system by reducing overall demand, shall be identified and discussed. In addition, a discussion of the issues and potential approaches for implementing TDM shall be provided.
▪ Transportation System Management (TSM) Programs: TSM programs or policies implemented by the County or local cities, which are intended to improve the efficiency of the existing transportation system capacity, and which include Intelligent Transportation System (ITS) investments, shall be identified and discussed. In addition, a discussion of the issues and potential approaches for implementing TSM or ITS shall be provided.
Deliverables: shall include a technical report with appropriate maps and graphics, both in hardcopy and on CD-ROM, and a summary suitable for use as the setting section in a Program EIR. Information shall be organized according to transportation mode, with an additional section that focuses on the transportation system as a whole. Inventory and service information shall be presented in tabular form. Graphics shall be provided to illustrate transportation facility locations, location-specific operational information, location-specific service information, and any other transportation information that can be effectively presented graphically. Roadway mapping shall be consistent with the County’s GIS roads layer. Maps provided shall be at a scale of 1:12,000 and include, at a minimum, a Transportation Network Map, an Existing Traffic Volumes Map, a Roadway Capacity Map, a Roadway Level of Service Map, a Transit System Routes/Major Facilities Map, a Rail & Airport Facilities Map, and a Sidewalks, Paths & Trails Map. Where available Napa County’s Environmental Resource Maps shall be used as the base and starting point for further mapping. Field-work and the collection of new field data will be undertaken to complete this task.
Evaluation Areas
Roadways: (55+)
▪ all State Highways (SR 12, 29, 121, 128, & 221)
▪ all major County Roads (American Canyon Rd, Flosden Rd, Silverado Trail, Dry Creek Rd, Mt Veeder Rd, Oakville Grade, Spring Mtn Rd, Petrified Forest Rd, Tubbs Lane, Dunaweal Lane, Lodi Lane Zinfandel Lane, Oakville Cross Rd, Yountville Cross Rd, Oak Knoll Avenue, Big Ranch Rd, Atlas Peak Rd, Hagen Rd, Coombsville Rd, Third Avenue, Wild Horse Valley Rd, Green Island Rd, Airport Blvd, Wooden Valley Rd, Gordon Valley Rd, Chiles/Pope Valley Rd, Berryessa/Knoxville Rd, Pope Canyon Rd, Pope Valley Rd, Butts Canyon Rd, Howell Mtn Rd, White Cottage Rd, Deer Park Rd, etc)
▪ all major roads running through the cities and towns (e.g., Trancas St, Soscol Avenue, Pratt Avenue)
Other Transportation Facilities: (1)
▪ County (as a whole)
XV. Visual and Aesthetic Resources [Deferred Task For Which Funding Not Currently Allocated]
Information Required: This section shall describe the visual resources of the County in terms of the built environment (urban landscape), open space (including agricultural land and naturalistic undeveloped areas), and scenic corridors. Important views, viewsheds, ridgelines, scenic corridors, and related viewing locations as specified in the County Viewshed Ordinance shall be identified through field inspection and mapped in a manner compatible with the Napa County Environmental Resource Mapping System. Historic changes in views shall be discussed, with the purpose of analyzing trends and providing an appropriate visual resource baseline. Descriptions of the aesthetic review mechanisms included in the current zoning ordinance shall be provided. Visual impact procedures employed by federal agencies for inventory of visual character and quality, analysis of viewer response, and assessment of impacts and visual resource management shall be summarized for future use.
Deliverables: shall include a technical report with appropriate maps and graphics, both in hardcopy and on a CD-ROM, and a summary suitable for use as the setting section in a Program EIR. Maps provided shall be at a scale of 1:12,000 and include, at a minimum, an Important Ridgelines and Visual Features Map and a Scenic Roads & Corridors Map. Where available, Napa County’s Environmental Resource Maps shall be used as the base and starting point for further mapping. Fieldwork and the collection of new field data will be undertaken to complete this task.
Evaluation Areas: (10)
▪ Napa River Marshes
▪ Carneros Area
▪ Jameson/American Canyon
▪ Western Mountains
▪ Napa Valley Floor
▪ Angwin/Livermore Ranch Area
▪ Eastern Mountains (excludes Angwin Area)
▪ Interior Valleys (Pope Valley, Central Interior Valleys, and Southern Interior Valleys)
▪ Berryessa Area (includes adjoining uplands and subsidiary valleys to Berryessa Valley)
▪ Knoxville Area (includes Upper Putah Creek Area)
XVI. Public Facilities and Services
Information Required: This section shall contain information on the existing levels of public services and utilities provided in the unincorporated portions of the County. Existing demand shall be documented based on information received from service providers, including various municipalities departments, and districts. Specifically, this section shall focus on the following services:
• water supply
• sewer
• solid waste
• law enforcement
• fire protection
• medical facilities
• schools
• farm worker housing
• recreation
• social services
Service providers for each of the services listed above shall be contacted and requested to provide information on service areas, facilities, capacity, existing demand, planned improvements, and, where applicable, service standards. Capacity shall be compared to existing demand/service standards to identify excess capacity or demand.
Deliverables: shall include explanatory text with appropriate maps, graphics, and tables, both in hardcopy and on a CD-ROM, in a format suitable for use as the setting section in a Program EIR. Maps provided shall be at a scale of 1:12,000 and include, at a minimum, a Service Area/Facility Map for each type of service provider involved, and a Response Time Map for police, fire, and ambulance service. Fieldwork and the collection of new field data will not be undertaken.
Evaluation Areas: (16)
▪ American Canyon
▪ Napa Co Airport Industrial Area
▪ Jamieson/American Canyon-Unincorporated 2(excludes American Canyon and Napa Co Airport Industrial Area)
▪ Carneros Area
▪ Napa & Vicinity
▪ Yountville
▪ St Helena
▪ Calistoga
▪ Napa Valley Floor-Unincorporated 2 (excludes Napa & Vicinity, Yountville, St Helena, & Calistoga)
▪ Western Mountains
▪ Livermore Ranch Area
▪ Angwin Area (includes Deer Park)
▪ Eastern Mountains (excludes Angwin Area)
▪ Interior Valleys (Pope Valley, Central Interior Valleys, and Southern Interior Valleys)
▪ Berryessa Area (includes adjoining uplands and subsidiary valleys to Berryessa Valley)
▪ Knoxville Area (includes Upper Putah Creek Area)
Cultural Resources
Information Required: A Jones & Stokes cultural resource specialist shall examine the existing data on prehistoric and historic archaeological resources in Napa County. Jones & Stokes will use the County’s existing digitized information and data of sites and will update this inventory based on research conducted at the Northwest Information Center (NWIC). Updated information regarding locations will include the site number and location. Research at the NWIC will include review of the state’s database of known cultural resources, as well as historic maps and state, national, and, if applicable, local inventories of known historic resources. The purpose of this research is to provide the County with a summary of known resources for each of the 19 USGS 7.5 minute topographic quad maps within the County. Information obtained from this focused research at the NWIC will be used to develop summaries of a number of key cultural resource variables. The Cultural Resources section of the Baseline Data Report (BDR) shall provide a review of existing background reports and publications that contain information on prehistoric, historic, scientific (i.e. type locations for minerals & geologic formations, and key scientific research sites), and recreational resources (i.e. parks, swimming holes, hot springs, historic trails and roads, etc.) within Napa County.
Site densities, site types, and survey coverage within each location within the County will be used by the County in planning future projects and in determining sensitivity on a project by project basis. The information gathered from the NWIC will be complemented by information gleaned from geological maps, historic maps, and general landform types such as mountainous regions, steep slopes, proximity to water sources etc. Together, these data sources will allow Jones & Stokes to identify areas of cultural resource sensitivity. Known archaeological sites will be plotted at points and identified areas of cultural resource sensitivity will be mapped as polygons in GIS and attributed accordingly. These data will be developed to be compatible with the GIS database for the proposed Watershed Information Center and, thus, will be available to the general public.
Specific Tasks: The BDR for cultural resources shall include the following work tasks. Level of effort to conduct these tasks shall be in accordance with labor effort as indicated in the provided cost estimate:
Task 1: Conduct Research at the NWIC
Each of the 19 topographic maps covering Napa County will be examined and general locations of recorded sites, site density, and analysis of site types will be developed for each 7.5 minutes topographic map. In addition, general survey areas for each map will be prepared. A bibliography of all archaeological investigations conducted within the last ten years will be provided to the County in text format. Research at the NWIC will include:
• Site Density Analysis: information gathered from plotting recorded sites will be used to assess site densities for each topo map within the county.
• Site Type Analysis: information gathered from the written records and location of known sites within the County will be used to develop contexts regarding the various site types present within the county such as historic sites, Native American burials, large prehistoric villages, small special purpose sites (i.e. hunting camps or seed processing areas etc.).
• Survey Coverage: through information obtained from the research at the NWIC, general statements regarding survey coverage for each topo map within the county will be made in the technical report.
Jones & Stokes is proposing a general assessment approach for the NWIC records search for the following reasons:
a. The proposed general assessment approach will proved adequate information to support future planning projects on an ongoing and long-term basis.
b. The proposed general assessment approach is cost effective. While staying within the proposed budget, Jones & Stokes will be able to provide the county with valuable information regarding the known cultural resources within the county, areas of sensitivity, and useful predictive modeling for future planning that will not be outdated in a short period of time.
c. The proposed general assessment approach is consistent with the confidentiality requirements of the NWIC. This work will be conducted in accordance with the goals of the NWIC while meeting the needs of the county.
An additional reason for the general assessment approach is that it is the optimal approach to researching cultural resources information, as a comprehensive records search is a tremendous time and budgetary strain. A comprehensive records search does identify the legal adequacy or level of effort involved in each archaeological investigation conducted within the last ten years. For the purposes of the county, an individual records search, field investigation and technical report is required for each specific project that occurs in the county regardless of the baseline research available. Records search information is quickly outdated within six months to a year of the research making the information of limited utility to the county.
Task 2: Historic Reviews
The consultant will review the roster of historic properties listed in the National Register of Historic Places, the California Register of Historical Resources, and local or regional historic registers (Napa County staff shall supply any pertinent local information). In addition, Jones & Stokes cultural resources staff will provide a list of all archaeological sites, buildings, and structures that have been determined eligible for listing in the NRHP and CRHR.
Task 3: Cultural Reviews
Consultant will review culturally important scientific and recreational site-types or other locations in coordination with the Geology and Public Facilities resource tasks being conducted for the BDR. In addition the consultant shall contract the Native American Heritage Commission to request information on any sacred sited in Napa County. This information will be summarized so as to not divulge the locations of sensitive resources.
Task 4: Evaluation of Cultural Sensitivity
Consultant shall identify and consider general areas of potential cultural sensitivity for prehistoric resources based on locations of known prehistoric archaeological sites and general landform analysis such as proximity to year round water sources.
Task 5: Regulatory Guidance
Consultant shall prepare a basic outline of procedures that are required for applicants to adhere to and fulfill regulatory requirements for CEQA, NEPA, and Section 106 of the NHPA compliance.
Deliverables shall include a technical report with appropriate maps and graphics, both in hardcopy and CD-ROM, and a summary suitable for use as the setting section in a Program EIR. Prehistoric, ethnographic, and historic contexts and guidelines for procedures for future projects shall be provided. Maps provided shall be at a scale of 1:24,000 and include, at a minimum, an Archeological Sites Map, a Historic Features Map, a Cultural Sensitivity Map, and a Scientific/Educational/Recreational Resources Map. Where available Napa County’s Environmental Resource Maps shall be used as the base and starting point for further mapping. Fieldwork and the collection of new field data will not be undertaken.
Evaluation Areas:
Archaeological Resources: (10)
▪ Lower Napa Valley (Carneros, Napa River Marshes, & Jamieson/American Canyon)
▪ Napa Valley Floor
▪ Western Mountains
▪ Angwin/Livermore Ranch Area
▪ Eastern Mountains (excludes Angwin Area)
▪ Pope Valley (includes adjoining uplands)
▪ Central Interior Valleys (Chiles, Capel1, & Soda valleys and adjoining uplands)
▪ Southern Interior Valleys (Wooden & Gordon Valleys and adjoining uplands)
▪ Berryessa Area (includes adjoining uplands and subsidiary valleys to Berryessa Valley)
▪ Knoxville Area (includes Upper Putah Creek Area)
Historical, Scientific, & Recreational Resources: (1)
▪ County (as a whole)
Key Assumptions:
▪ Information regarding mineral and geologic type-sites and culturally significant formations will be based on findings and coordination with geologists working on the Geology and Mineral Rock Resource Topics to support the BDR. No additional geologic research shall be conducted in support of the Cultural Resources Resource Topic.
▪ Information regarding culturally significant recreational resources will be based on findings and coordination with staff working on the relevant Topics to support the BDR and data in the County’s files. No additional recreational research shall be conducted in support of the Cultural Resources Resource Topic.
▪ Records searches will include mapping of recorded archaeological sites within the last fifteen years only, however, exact locations of the sites will not be provided nor will written site records. The site locations will be provided with a thirteen-hundred foot buffer zone around them for the purposes of confidentiality. The current level of effort and budget will not include mapping of all archaeological investigations conducted within the last fifteen years. A bibliography of all archaeological investigations will be included. Jones & Stokes cultural staff recommends that the County maintain an updated version of the bibliography of all archaeological investigations conducted within the past fifteen years and order copies of these reports on a project-by-project basis for budgetary and practical reasons. If client requests hard copies of all archaeological investigations conducted within the last ten years, all photocopying will be conducted by the staff at the NWIC, however, all copying will be done at an additional cost to the County and the NWIC may dictate the time frame within delivery.
▪ GIS assumptions: Existing datasets are in GIS format and the data does not need additional work to be used in the project. A single set of criteria for sensitivity mapping will be provided and all necessary data is available and does not need modification to be used in the model. Meta data for newly identified sites shall be limited to site number.
GIS Products:
It is recognized that the deliverable maps developed as part of this study will form the foundation for an internet-ready resource information database maintained by Napa County’s Watershed Information Center. Therefore, all maps provided shall be delivered as shapefiles in ArcGIS 8.x format using the datum system currently employed by the County (California State Plane Coordinate System (feet), Zone II, NAD 83). All GIS layers supplied shall meet the following specifications:
Compatibility:
Every reasonable effort shall be made to ensure compatibility with the County’s existing data layers, attribute fields, naming conventions, etc.
Data Integrity:
All GIS data originally mapped at a scale other than the scale specified under the resource topic in the Individual Resource Topics section above shall be mapped in such a manner as to reflect the level of uncertainty introduced by the scale change involved. New data derived from surveys or modeling shall be produced at the scale specified in the relevant resource section if the primary data sources (i.e., aerial photos and DEMs) will support the specified scale.
Line Work:
All lines shall be digitized in such a manner so that the digitized line does not deviate from the actual line by more than 1/40th of an inch at the mapping scale specified. For layers created which are based on and must follow line work of any existing data layer, the new layer shall be snapped to all existing vertices in underlying base layer.
Attribute Tables:
All data in attribute tables shall be consistent within itself as to conventions, such as all caps or all lowercase, and abbreviations. Existing attribute standards will be provided to the Consultant.
Unnecessary Fields:
All unnecessary fields shall be deleted from the deliverable GIS layers. For example, when converting from ESRI coverage format to ESRI shapefile format, a number of coverage-specific fields are included in the output shapefile. These fields shall be deleted before delivery.
Metadata:
All new GIS layers derived or developed for the Baseline Data Report and all data added to existing GIS layers that are to be updated shall be accompanied by XML-formatted metadata that follows the FGDC Digital Geospatial Metadata standard (see FGDC-STD-001-1998). The metadata fields that are required for each deliverable GIS layer can be listed using ESRI’s ArcCatalog 8.3 FGDC Editor. All fields displayed using the FGDC Classic Style Sheet shall be completed fully. The software will fill out certain fields automatically. All others fields shall be completed manually by the Consultant.
When using ArcCatalog’s FGDC Editor, there are numerous fields displayed for input that do not appear on the output for the FGDC Classic Style Sheet. The Consultant is encouraged to provide as much of this information as possible. However, only the following fields PLUS those marked “REQUIRED” in the editor must be completed:
▪ Definition for each attribute field. Attribute fields with coded values must include descriptions of the codes. These can be entered in ArcCatalog as Attribute Domain Values or listed separately in a look-up table.
▪ Contact E-Mail Address.
▪ Complete Spatial Reference Information. All shapefiles, geodatabases or coverages shall be in the following coordinate system: California State Plane Coordinate System (feet), zone II, NAD 83
▪ Process Description. A summary of the process used to produce each GIS layer. This can be entered under Data Quality, Process Step using the ArcCatalog FGDC Editor.
▪ Source Information. This can be entered under Data Quality, Source Information on the General, Source Citation and Source Time Period of Content tabs.
▪ Accuracy. A description of the positional and attribute accuracies. These can be entered under Data Quality, Attribute Accuracy, and Positional Accuracy.
Map Accuracy:
GIS maps submitted shall be carefully QA/QC’d prior to submission to County so as to achieve a minimum accuracy of 95%.
SCOPE06.10-28-03.PEIR BASELINE RPT
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