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1.Approach and Scope of Work Assumptions The applicant will provide ESA with site-specific existing data,to the extent available/relevant,potentially including a Phase I Environmental Site Assessment, Phase I1 programs documentation, and compiled hazards database searches(such as a previously completed EDR report), if available. ESA assumes that full database searches will not reveal existing contamination on the project site.If existing contamination is identified on site,additional documentation and environmental review may be required, which would be outside the purview of this scope,and could require additional effort/budget. Hydrological, Flooding and Water Quality Issues The project site is located within the watershed of the San Joaquin River,in the vicinity of the eastern boundary of the Sacramento-San Joaquin Delta. Hydrology on site at present is likely dominated by agricultural irrigation during the summer months,and stormwater flows during the winter months. Drainage on site is currently provided by a series of agricultural drains that eventually merge with the South San Joaquin Irrigation District(SSJID) agricultural drainage and flood control facilities,located off site. A preliminary review of FEMA flood maps indicates that the project site is not located in or adjacent to a 100-year flood zone.These drains discharge into the San Joaquin River/Delta. Our preliminary research indicates that no water quality data are available on site or for waterways that are in close proximity to the project site.However, the portion of the San Joaquin River located downstream of the project site is included on the Central Valley Regional Water Quality Control Board's (CVRWQCB)2006 303 (d)List of Water Quality Limited Segments, for the following constituents: electrical conductivity,boron,mercury,DDT, Group A pesticides, and toxaphene. During the scoping process, SSJID expressed concern regarding potential discharges from the project site into SSJID's drainage facilities, and indicated that the applicant would need to conform to SSJID's current policy for stormwater drainage and drainage infrastructure updates, including completion of storm drainage calculations as warranted and adherence to specific construction schedules and design standards. SSJID also requires that any existing on-site irrigation or storm drainage infrastructure needed to provide irrigation or storm drainage to SSJID's service area should not be moved or removed unless alternate, functional facilities are installed. Finally, i 1-22 San Joaquin County-E!R for the Union Pacific Modernization Project