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iii) Create or contribute runoff water which would exceed the capacity of existing or planned stormwater drainage systems or provide substantial additional sources of polluted runoff? iv) Impede or redirect flood flows? d) In flood hazard, tsunami, or seiche zones, risk release of pollutants due to project inundation? e) Conflict with or obstruct implementation of a water quality control plan or sustainable groundwater management plan? NARRATIVE DISCUSSION Environmental Setting Surface and Groundwater Hydrology Duck Creek crosses the 3009 Pock Lane site at its approximate midpoint. Duck Creek is an intermittent stream that originates east of Stockton and flows westward into Walker Slough. At the project site, Duck Creek is channelized. Duck Creek is a terminal drainage for existing developed areas located to the east and west of the site. Bieghle Drain, along the northern boundary of the 2706 Pock Lane site, is a constructed channel that conveys storm drainage in the southeast Stockton area to a detention basin adjacent to Duck Creek downstream from the project site. Bieghle Drain has water flow only during and immediately after storm events. No other surface water bodies are in the project vicinity. The project site is within the Eastern San Joaquin County Groundwater Subbasin of the San Joaquin Valley Groundwater Basin. A geotechnical report indicates that groundwater levels at the project site range from 31 feet to 57 feet in depth below the ground surface, depending on the season (CTE Cal 2021). Recharge to the groundwater system in the Stockton area primarily is from percolation of irrigation return water, precipitation, seepage from reservoirs and rivers, and urban runoff. In 2014, the California Legislature passed the Sustainable Groundwater Management Act (SGMA), which gives local agencies greater authority to manage groundwater supplies. The legislation requires the formation of local Groundwater Sustainability Agencies that must assess conditions in their local water basins and adopt locally based Groundwater Sustainability Plans to manage groundwater. SGMA requires that Groundwater Sustainability Plans for critically overdrafted basins be adopted by January 31, 2020. Overdraft occurs when the amount of groundwater extracted in a basin exceeds the long- term average groundwater recharged. The Eastern San Joaquin Subbasin has been designated a critically overdrafted basin. The Eastern San Joaquin Groundwater Authority, which oversees the Subbasin, adopted and submitted a Groundwater Pock Lane Public Review Draft IS/MND 3-44 May 2022