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LOGE 1928: American Crane Rental Page 3 <br /> May 29, 2019 <br /> For the recharge rate of rainfall (R), Provost & Pritchard use a value of 11.5 inches per <br /> year; no source is cited. It is our opinion that this value most likely derives from Figure <br /> 3 of the Soil Survey of San Joaquin County, California (1992). As of March 2019, the <br /> Environmental Health Department has requested that the recharge rate of rainfall be <br /> calculated in a specific way, as discussed later in this letter. <br /> The assumptions and result of the nitrate loading calculation prepared by Provost & <br /> Pritchard are as follows: <br /> Table 1. Inputs and Results for Nitrate Loading Calculation, <br /> Provost & Pritchard, 2012 <br /> Variable Value Units Description <br /> Q 126,225 gal/year Effluent flow rate <br /> (345.8) (gpd) (33 people" 15 gal/person'255 work days/year) <br /> Nw 82 mg/L-N Effluent stream concentration (discussed in report) <br /> A 8.42 acres Site area <br /> Nb 0.1 mg/L-N Concentration of rain (source not cited) <br /> d 0.15 constant Denitrification factor("fine-grained silty sand soil") <br /> R 11.5 inches per year Recharge rate of rainfall (source not cited) <br /> 1 0.55 inches per year Uniform waste water loading (calculated) <br /> Nr 3.3 mg/L-N Long-term average concentration of percolating <br /> effluent <br /> Assessment of Current Conditions Using EHD-Recommended Methods <br /> The current project includes all of APN 208-180-23, 11.80 acres in size (A). <br /> Employee levels are discussed in Exhibit A of the Use Permit application. The facility <br /> will only be operated Monday through Friday. Anticipated employees are as follows: <br /> • 10 office workers, 8 a.m. to 5 p.m. <br /> • 8 mechanics, 8 a.m. to 5 p.m <br /> • 2 yard workers, 8 a.m. to 5 p.m <br /> • 10 crane operators, arrive at the office each morning for 15 to 30 minutes <br /> prior to dispatch to job site for remainder of day <br /> • 10 crane operators, dispatched directly to job site without visiting office <br /> When selecting flow values for commercial/industrial workers, Live Oak typically selects <br /> those listed by Crites and Tchobanoglous (1998). This reference indicates that 13 <br />