Laserfiche WebLink
III. NITRATE LOADING STUDY FINDINGS <br /> A. WASTEWATER FLOW VOLUME PROJECTIONS AND CHARACTERISTICS <br /> Wastewater Flow Volume Projections <br /> Typically, loading projections for commercial facilities are based on the maximum anticipated <br /> wastewater flows generated by people that occur daily,weekly,monthly, or for singular events. <br /> Siegfried has calculated flow volumes from the South Dock Restrooms,the Office in the SWC of the <br /> Building, and the North Dock Restrooms to be a total ADF of 600 gpd. This flow volume will be <br /> used below in the nitrate loading calculations. <br /> Wastewater Characteristics <br /> To accurately assess and quantify the anticipated nitrogen concentration emanating from the proposed <br /> sanitary sewer septic system, an effluent sample was obtained from the septic tank installed in 2017 <br /> that serves a number of Buildings in the Holly Commerce Center. This tank is located directly <br /> southeast of the sugar storage silos. <br /> Test results reveal a high ammonium concentration of 137 ppm and a comparatively low organic <br /> concentration of 9 ppm, for a TKN concentration of 146 ppm. Nitrate is not found in septic system <br /> effluent due to anaerobic conditions within the tank, and is therefore not included with the TKN to <br /> arrive at TN. This TKN concentration will be used in the loading calculations below. <br /> The following Table summarizes the septic tank effluent analytical test results: <br /> TABLE 5 <br /> SEPTIC TANK EFFLUENT SAMPLED FROM TANK INSTALLED IN 2017 SERVING <br /> THE HOLLY COMMERCE CENTER: <br /> ANALYTICAL RESULTS OF TESTED CONSTITUENTS <br /> SAMPLE ID A MONIOM ORGANIC NITROGEN TOTAL KJELI)AI3L pH <br /> NITROGEN-NA, NITROGEN,(TKN) <br /> Holly-S.T.EFF. 137 mg/L 9 mg/L 146 mg/L 6.5 <br /> B. CALCULATED NITRATE-NITROGEN LOADING <br /> NLS§3.4,3.5,3.6. The calculated nitrate-nitrogen impact to the soil and ultimately to the groundwater <br /> is difficult to determine due to the large number of variables involved and variables unknown at this <br /> time. These include: 1.) Impact from upgradient nitrate sources,particularly the City of Tracy <br /> Land <br /> er treatment plant, 2.)Variability in wastewater flows, effluent nitrogen concentrations and <br /> ffects from Sugar Cut and stormwater recharge, 3.) Changes in groundwater directional flow <br /> tion caused by surrounding water bodies. <br /> Page -7- <br /> Chesney Consulting <br />