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5.15 WATER RESOURCES deficit in aquifer volume or a lowering of the local groundwater table level,cumulative impacts to groundwater are less than significant. 5.15.4 Mitigation Measures This section presents mitigation measures proposed to reduce impacts to water resources to a less-than-significant level. 5.15.4.1 Construction The mitigation measures proposed are prescribed by stormwater and erosion control management programs mandated under the NPDES permitting system. These programs have been in place for a number of years and the prescribed measures have proven effective. Under the General NPDES Permits for Construction,for example,various specific measures are prescribed,and a program of monitoring is required. • In accordance with the construction SWPPP,implement BMPs designed to minimize soil erosion and sediment transport during construction of the plant site. Design appropriate erosion and sediment controls for slopes,catch basins,culverts, stream channels,and other areas prone to erosion. • In accordance with the construction SWPPP,perform refueling and maintenance of mobile construction equipment only in designated lined and/or bermed areas away from stream channels. Prepare and implement spill contingency plans in areas where they are appropriate. 5.15.4.1.1 Groundwater For the LEC project,the onsite potable well will be screened several hundred feet below the known area of low-quality shallow groundwater. The well will be screened at a sufficient depth to be unaffected by the existing shallow low-quality groundwater. Additional measures to protect the water quality of the well include: • 75 feet of cemented surface casing will be installed; • Vertical hydraulic gradients will be estimated annually using the existing shallow groundwater monitoring wells; • And a sampling port will be installed at the well and the well will be sampled for general chemistry parameters,nitrates, and coliform,at least annually. 5.15.4.1.2 Flooding Potential The City of Lodi Municipal Code,Title 15 (Buildings and Construction) addresses flood damage prevention(Chapter 15.60) and sets guidelines for development in flood hazard areas. A development permit shall be obtained before construction or development begins within any area of special flood hazards (Section 15.60.070 of the Lodi Municipal Code). Furthermore,all construction and development in flood hazard areas must adhere to the Standards of Construction in Section 16.60.140,Article III,Provisions for Flood Hazard Reduction. While the project could potentially expose people or structures to significant risk of loss,injury, or death resulting from levee failure,compliance with the Lodi Municipal Code would sufficiently mitigate any flood risk to a less-than-significant level. SAC1371322/082340005(LEC_5.15_WATER_RESOURCES.DOC) 5.15-25