Waste Discharge Order 01-04116, the landfill is routinely monitored for offsite migration of contaminants in groundwater, leachate seeps, and soil gas. The landfill closure process is overseen Environmental Health Division of the by San Mateo County Health System and the RWQCB.

BBCAG-271

[See page 5-145 for the original comment] As stated in the Draft EIR, cleanup levels approved by the RWQCB may not reflect drinking water standards because the groundwater basin is not used for domestic water supply (drinking water). See Response BBCAG-129 for discussion of groundwater cleanup standards.

The description referenced in this comment is to the entirety of the watershed, which is far larger than the former wetland marsh. The final paragraph on page 4.H-1 is revised to read as follows.

Historically, the Project Site, commonly known as the Brisbane Baylands, was part of an estuarine ecosystem through which upland drainage flowed into tidal marshes and mudflats before reaching deeper waters of San Francisco Bay. The Project Site is located within the Visitacion-Guadalupe Valley Watershed, which topographically appears as a large cove or generally consists of a bowl straddling the San Francisco/ and San Mateo County line Counties. The watershed drains the area bounded by Bayview Hill, McLaren Ridge, and San Bruno Mountain. The two main drainages of the watershed are Visitacion Creek and Guadalupe Creek, which originate in the upland areas to the west and drain toward San Francisco Bay. Visitacion Valley has been divided into two unnamed subwatersheds due to the fact that the northern portion is pumped northward into the San Francisco combined sanitary/stormwater sewer system. The southern portion, which includes Visitacion Creek, drains by gravity to San Francisco Bay, but much of it is channelized. Guadalupe Creek also drains by gravity to the Bay via Brisbane Lagoon.

BBCAG-272

[See page 5-145 for the original comment] Pursuant to the provisions of CEQA, the Draft EIR analyzes physical changes to the environment that would result from proposed Baylands development, including impacts of site remediation and grading, infrastructure construction and operation, provision of water supply, and land use development and operations. Because specific impacts of offsite, up-slope, or upstream “polluters” would not be a result of proposed Project site development, such analysis is not provided in the Draft EIR, although the effects of these upstream uses are recognized as part of the Draft EIR’s existing conditions.