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LOGE 1928: American Crane Rental Page 4 <br /> June 19, 2019 <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 /> gallons for each employee is typical for an office or industrial worker and 5 gallons is <br /> typical for a public restroom user. These rates were used for the employees of the <br /> facility and the daily-departing truckers. <br /> The use rate for employees (Q) is calculated as follows: <br /> Table 2. Average Daily Flow Calculation, Current Project <br /> Use Units Rate Subtotal Reduction* Average <br /> Daily Flow <br /> Office Workers 10 13 gal/person 130 gpd 5/7 92.8 gpd <br /> Mechanics 8 13 gal/person 104 gpd 5/7 74.3 gpd <br /> Yard Workers 2 13 gal/person 26 gpd 5/7 18.6 gpd <br /> Crane 10 5 gal/person 50 gpd 5/7 35.7 gpd <br /> Operators, <br /> on-site for <br /> 15-30 min. <br /> Crane 10 0 gal/person 0 gpd 5/7 0 gpd <br /> Operators, = <br /> dispatched ^ J�� <br /> directly to job � (� <br /> sites <br /> Total 221.4 gpd <br /> 'Reduction factors convert calculated flow into average daily flow over a year. The factor 5/7 refers to days per <br /> week. <br /> Total nitrogen levels from commercial wastewater uses are known to be higher in <br /> concentration compared to residential levels, which include significant dilution from <br /> washing water. The typical residential wastewater range is reported to be 20 to 85 <br /> mg/L-N (Crites and Tchobanoglous, 1998). Since reference material for commercial <br /> restroom uses is limited, we assume total nitrogen is similar to higher residential values; <br /> therefore, 85 mg/L-N is selected as Nw. <br /> Based on San Joaquin County Environmental Health Department policy (personal <br /> communication, March 18, 2019), the recharge input (R) for the Hantzsche and <br /> Finnemore equation should be derived from average monthly precipitation of rainfall and <br /> evapotranspiration rates for the area; the data should be obtained from the California <br /> Irrigation Management Information System (CIMIS), preferably from stations located <br /> within San Joaquin County. Recharge is calculated by first determining whether the <br /> average monthly precipitation exceeds average monthly potential evapotranspiration. <br /> If so, then the difference is the percolating recharge water into the aquifer. Runoff and <br /> stream infiltration drainage are not factored into the calculation. This approach likely <br />