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lierracon Soil Suitability / Nitrate Loading Study <br />Morada Produce — Ag Processing Building a Stockton, California <br />May 14, 2021 • Terracon Prciect No. NA217014 <br />Septic <br />System <br />No. <br />Building ID <br />Number <br />Hours of <br />Operation <br />per day <br />Number of <br />Employees per day <br />Employee <br />Effluent <br />(x13 GPD8) <br />(x14.625 GPD9) <br />(x19.5 GPD12) <br />Number <br />ViaItors/Truckers <br />per day <br />Visitor <br />Effluent <br />(x3 GPD) <br />Maximum <br />Septic Tank <br />Usage <br />Employee <br />GPD + <br />Visitor GPD <br />3 Northeast <br />Restrooms <br />9 <br />(Standard <br />Mar-Sep) <br />50 731.25 3 9 740.25 <br />9 <br />(Sep-Oct) 80 1.170 2 6 1,176 <br />Total Existing Max GPD <br />(Septic Systems 1, 2, 3) 27,728 <br />4 <br />Proposed Ag <br />Processing <br />Building - <br />Southeast <br />Restrooms <br />9 <br />(Jul-Aug) 40 585 4 12 597 <br />12 <br />(August) <br />40 780 3 9 789 <br />Total Existing Max GPD 4- Proposed Max GPD <br />(Septic Systems 1, 2, 3, 4) 28,517 <br />Gallons per day (GPD). Gallons per 8 hour day (GPD8). Gallons per 9 hour day (GPD9). <br />Employee Effluent 13 gpd /8 hours per day = 1.625 gallons per hour <br />1.625 x 9 hours = 14.625 gpd (GPD9). 1.625 gph x 12 hours=19.5 gpd (GPD12) <br />Visitor Effluent 3 gpd. Visitors are assumed to be onsite less than 8 hours per day. <br />The maximum daily flow rate for the existing facility operations is approximately 27,728 gpd <br />(Septic Systems 1, 2, 3). The proposed Ag Processing Building (Septic System 4) is anticipated <br />to add approximately up to 789 gallons of effluent per day for a combined maximum daily flow <br />rate of approximately 28,517 gpd for the facility. <br />The septic system design should be based on the San Joaquin County On-Site Wastewater <br />Disposal Standards or other engineering recommendations. <br />1.4 Groundwater Information <br />1.4.1 Groundwater Depth and Gradient <br />Groundwater was not encountered within our borings which were drilled between 3.0 and 25.0 <br />feet bgs. Based on a review of the California Department of Water Resources Well Completion <br />Report Map Application, static water level was reported at 134 feet bgs at a well currently under <br />construction on the northern portion of the site. <br />According to the California Department of Water Resources Sustainable Groundwater <br />Management Act (SMGA) Data Viewer, in Fall 2019 depth to groundwater was reported between <br />approximately 120 to 130 feet bgs. In Spring 2020 depth to groundwater was reported between <br />110 to 120 feet bgs. Groundwater flow direction was reported to the southeast. The groundwater <br />flow direction and the depth to shallow, unconfined groundwater, if present, would likely vary <br />depending upon seasonal variations in rainfall and other hydrogeological features. Without the <br />benefit of on-site groundwater monitoring wells surveyed to a datum, groundwater depth and flow <br />direction beneath the site cannot be directly ascertained. <br />Responsive a Resourceful • Reliable 8