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Nitrate Loading Analysis BSK Job E21-002-01B 2482 Carpenter Road July 13, 2021 Stockton, California P a g e | 2 Surrounding the site is mixed residential and agriculture use. Adjacent to the site to the east and toward the north are large orchards that could be sources of nitrate due to fertilizer use. To the south and west are residential and electrical substation. There is an existing septic system that is connected to a seepage pit located at the eastern portion of the adult care facility property. The Onsite Systems Manual (2017) d oes not have specific design flow values for Adult Care facilities, so the EPA Design Manual-Onsite Wastewater and Disposal Systems manual was used to estimate the gallons per day (gpd). The estimated wastewater flow rates from rest home is 90 gpd per resident and between 15 gpd per employee. The value of 90 gpd per resident was provided by the county, as this facility is similar to rest homes the county has experience with. The following model assumes for 23 residents and five employees which will result in an estimated 2,145 gpd dosing rate to the proposed septic system. 1.2 Data Gaps The following data gaps, which may affect this analysis, were identified: • Groundwater data used in this analysis was based on publicly available historical data from the nearest monitoring well, which is located approximately 0.51 miles south of the Site. Additional nearby wells have historic data that that is 3-5 years old. • Based on the available site-specific data, the actual depth to bedrock is unknown. • Based on the available site-specific data, it is unknown if the first-encountered groundwater at the Site occurs in alluvial sediments or in bedrock.