Cargas del Espacio Externo

a. Exceed wastewater treatment requirements of the applicable

Regional Water Quality Control Board? 

b. Require or result in the construction of new water or wastewater treatment facilities or expansion of existing facilities, the

construction of which could cause significant environmental effects?



c. Require or result in the construction of new storm water drainage facilities or expansion of existing facilities, the construction of which could cause significant environmental effects?

 d. Have sufficient water supplies available to serve the project from

existing entitlements and resources, or are new or expanded entitlements needed?

 e. Result in a determination by the wastewater treatment provider

which serves or may serve the project that it has adequate capacity to serve the project’s projected demand in addition to the provider’s existing commitments?



f. Be served by a landfill with sufficient permitted capacity to

accommodate the project’s solid waste disposal needs?  g. Impact with federal, state, and local statutes and regulations

related to solid waste? 

Sources: Wastewater Feasibility Study for Greystone, Prepared by Summit Engineering, Inc., June 15, 2016; Wastewater Feasibility Study for Vineyard Lodge, Prepared by Summit Engineering, Inc., June 15, 2016; Water Availability Analysis for Greystone and Vineyard Lodge, Prepared by Summit Engineering, Inc., June 14, 2016; Stormwater Control Plan for Vineyard Lodge, Prepared by Summit Engineering, Inc., June 21, 2016; Cal Recycle (http://www.calrecycle.ca.gov/SWFacilities/Directory/28-AA-0002/Detail/).

Setting

The Greystone Campus and Vineyard Lodge Housing site are served by the following service providers: • Water supply and distribution: City of St. Helena

• Wastewater collection and treatment: Markham Combined Wastewater System; City of St. Helena • Storm drainage: City of St. Helena

• Solid waste service: Upper Valley Disposal and Recycling • Electrical and natural gas power: Pacific Gas and Electric Co.

Wastewater

The Greystone Campus discharges effluent to the privately owned Markham Combined Wastewater System (MCWS). The volume of wastewater entering this facility is regulated by Napa County Department of Environmental Management. The Vineyard Lodge Housing site discharges to the City of St. Helena’s wastewater treatment system. The City’s existing wastewater treatment plant capacity is limited by permit to 0.5 mgd per day during the three dry months of the year. The City has been notified by the Regional Water Quality Control Board that treatment plant upgrades and an amended permit are required. The capacity issues of the wastewater treatment plant are a function of nutrient load (intensity of effluent) and dry weather flow (amount of effluent). The Regional Water Quality Control Board has not requested that there be a moratorium on new connections to the treatment plant.

Solid Waste

Upper Valley Disposal and Recycling and delivered to the Clover Flat Landfill outside of Calistoga. The landfill is permitted to receive 600 tons per day and as of September 2012 had 2,870,000 cubic yards of capacity remaining,

Water

The City of St. Helena provides water to both project sites. The current water allotments authorized by the Agreements allocate an average of 15,900gpd to Greystone and 4,750gpd to the Vineyard Lodge Site. The total allotment across the two sites amounts to an average of 20,650 gpd or 23.1 acre feet per year. As part of the CIA Master Plan project, the applicant is requesting to rescind the two separate agreements and adopt a new joint water agreement which would redistribute the gross water allotment across the two sites while maintaining the current total allotment of 23.1 AF per year.

Impact Analysis

a.(Exceed Wastewater Treatment Requirements) Less Than Significant Impact: The project is not expected to exceed

wastewater treatment requirements set forth by the Regional Water Quality Control Board. To accommodate wastewater flows generated at the Greystone Campus, the existing onsite primary treatment would be used, including one 3,000 gallon grease interceptor, two 7,500 gallon settling tanks and one 6,000 gallon settling tank, and a pump sump and pump to convey the SS flows to the Markham Combined Wastewater System (MCWS) located at Markham Winery on SR 29, north of St. Helena. Improvements to the existing dishwashing and other kitchen facilities, including replacement with more water and energy efficient equipment, in addition to the closure of the WSGR would reduce the overall water and wastewater demand for the site.Taken together, the proposed improvements will lead to a net decrease in flows conveyed and treated at the MCWS and will be within the authorized discharge amount of 14,850 gpd.

At the Vineyard Lodge Housing site, wastewater will be generated by dormitory restrooms, showers, and common areas. The project will utilize the existing sanitary sewer (SS). Effluent would undergo primary treatment in septic tanks and then be conveyed to the municipal sewer system through the existing 3” SS. The SS management system will be resized to accommodate a peak daily wastewater flow of approximately 9,520 gallons per day (gpd) which equates to a projected net increase of 1,960 gpd over existing capacity. The wastewater flows will be conveyed to the City of St. Helena Wastewater Treatment Plant, which has sufficient operating capacity to handle the additional flows generated at the Vineyard Lodge Housing site. Further, the project will be assessed the sewer impact fee which will help to maintain the existing system and contribute to the additional costs that will be incurred with the future expansion and upgrade of the wastewater treatment plant. Therefore, the project would not exceed wastewater treatment requirements and impacts would be less than significant.

b.(New Wastewater treatment Facilities) Less Than Significant Impact: There would be no new construction or expansion

of domestic water or wastewater facilities as part of the proposed project. For the Greystone Campus, as stated above, wastewater flows are expected to decrease following project implementation. For the Vineyard Lodge Housing site, as stated above, the project would result in a net increase of 1,960 gpd of wastewater over existing flows. However, the City of St. Helena Wastewater Treatment Plant has sufficient operating capacity to handle the additional flows generated at the Vineyard Lodge Housing site. Further, a sewer impact mitigation fee will be assessed with the purpose of maintaining the existing system and to contribute to offset costs of future expansion and upgrade of the wastewater treatment plant. The sewer impact fee will be assessed against the dormitory project at the time of issuance of building permits, therefore, impacts would be less than significant

c.(Require New Stormwater Drainage Facilities) Less Than Significant Impact: New catch basin filters, storm drains, and a

series of bio-retention facilities would be installed to accommodate stormwater flows at the Vineyard Lodge Housing site. The proposed stormwater facilities would follow the “Design Guidance for Stormwater Treatment and Control for Projects in Marin, Sonoma, Napa, and Solano Counties (DGSTC)”, prepared for the Bay Area Stormwater Management Agencies Association (BASMAA). Bio-retention LID Facilities would be sized at a minimum of 4% of the equivalent tributary area, as specified in the Phase II Stormwater National Pollutant Discharge Elimination System (NPDES) Permit. Bio-retention LID

Facilities would vary in size depending on the impervious areas for which they serve and would be located adjacent to these areas. These facilities would be designed in accordance with the Bioretention Facility Design Criteria beginning on Page 4-3 of the DGSTC.

Storm drains would be utilized throughout the project to direct stormwater from impervious areas, to the bioretention facilities at locations specified in the Stormwater Control Plan. The new pipes would be sized adequately to handle post project flow rates. Self-retaining areas would be designed in accordance with the criteria in “Areas draining to self-retaining areas” on page 4-2 of the DGSTC: a maximum ratio of two parts impervious to one part pervious area. Running parallel to the access drive, grass-lined interceptor swales would be utilized to convey and treat runoff from access drive. All swales would be designed to handle runoff from the 100-year storm event. In addition, the City of St. Helena collects Storm Drainage Impact Fees which are assessed based on the square footage of new impervious surfaces as a means to mitigating any potential storm drainage impacts generated by development. The proposed project is not expected to significantly increase runoff relative to the existing condition since the project site will be improved with an onsite storm drain system that conveys runoff to existing storm drain system with sufficient capacity. Therefore, the project is expected to result in less than significant impacts due to the expansion of existing storm water drainage facilities or construction of new facilities. Project activities at the Greystone Campus would be limited to the reconfiguration of interior uses and installation of a storage cave. Therefore, no new Stormwater facilities would be required at the Greystone Campus.

d. (Sufficient Water Supplies) Less Than Significant Impact: The CIA Campus currently operates under two separate water

agreements. The current water allotments authorized by the amended Agreements allocate an average of 15,900 gpd to Greystone and 4,750 gpd to the Vineyard Lodge site. The total allotment across the two sites amounts to an average of 20,650 gpd or 23.1 acre-feet (AF) per year. Under the CIA Campus Master Plan, the applicant proposes to rescind the two separate agreements and adopt a new joint water agreement which would redistribute the gross water allotment across the two sites to accommodate the increase in housing at the Vineyard Lodge site, while maintaining the existing water allotment of 23.1af per year. Therefore, no new or expanded water entitlements are needed and impacts are considered less than significant.

e. (Wastewater Treatment Capacity) Less Than Significant Impact: As previously discussed under item a), the proposed

improvements at the Greystone Campus will lead to a net decrease in flows conveyed and treated at the MCWS and will be within the authorized discharge amount of 14,850 gpd. Additionally, the City of St. Helena Wastewater Treatment Plant has sufficient operating capacity to handle the additional wastewater flows generated at the Vineyard Lodge Housing site. Therefore, the project will have less than significant impacts related to the adequacy or capacity of wastewater treatment facilities.

f-g. (Landfill Capacity) Less Than Significant Impact: During construction, the project would generate solid waste from

building demolition, concrete and asphalt from the removal of existing impervious surfaces, and wood waste from tree removal. Consistent with the 2013 Cal Green Tier 1 Mandatory Measures, the applicant will be required to recycle or salvage at least 50 percent of nonhazardous construction and demolition waste and prepare a Construction Waste Management Plan that documents the diversion of materials as required by CalGreen. Accordingly, impacts associated with construction waste will be less than significant.

At operation, the project would continue to generate additional solid waste. Although the waste stream generated by the project is expected to increase during construction and operation, it is not expected to exceed landfill capacity and is not expected to result in violations of federal, state, or local statutes and regulations related to solid waste. Therefore, implementation of the project will result in less than significant impacts to the local landfill’s permitted capacity for solid waste disposal, as well as federal, state, and local statutes and regulations.