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Wastewater Treatment System FALL CREEK Engineering Report ENGINEERING,INC. rate of 0.16 in/hr, each zone will receive approximately 0.13 in/day. On average during peak crush months each zone will get irrigated every other day. That means that the field will get an average of 0.5 inches of water per week (2 in/mo). The average daily process water application rate is about half of the evapotranspiration rate of grass in Lodi during the month of September (4.6 in/mo), as was shown in Table 4.1. This implies that additional water may need to be applied to keep the field green. It also implies that '�. additional process water may be added without hydraulically overloading the field. Similarly, ` the Winery may choose to apply additional water to the field during earlier spring and summer months when grassland evapotranspiration rates exceed process water generation rates. Water losses during the spring and summer month will primarily be through evapotranspiration with a minimal amount lost through infiltration. Infiltration may be higher in the winter when grass evapotranspiration rates are low and stormwater generation is high. 5.2. Surface Loading Rate 5.2.1. Organic Loading Rate The maximum land application rate for organic material applied to a slow-rate land infiltration system is generally required to be less than 100 lbs BOD/ac-day. Calculations were performed to determine if the disposal system at Jessie's Grove Winery would meet these requirements. An ` average daily flow rate (Q) of 1,660 was used and it was assumed as a worst-case scenario that the concentration of BOD in the effluent(C j was 400 mg/L (a 90% BOD reduction). The daily field application area(Aa) will be approximately 0.5 acres (2 sets/day each consisting of one 0.25-acre zone). The maximum daily surface-loading rate (LS) was therefore calculated as follows: — 1,660gaf * 400mg * 3.785L * 1b CC — d L gal 4.536*10'mg = 1 llbs/ac/day. Aa 0.5acres Each field will have approximately one day of rest between each day of water application, the average daily surface-loading rate is approximately 5.5 lbs/ac/day. This is well below the target generally set of 100 lbs BOD/ac-day. — 5.2.2. Nitrogen Loading Rate Nitrogen Loading Rate was calculated in a similar manner to BOD. The maximum land application rate for nitrogen is generally 150 lbs/ac-yr. To determine whether the disposal low system at Jessie's Grove would meet these requirements, several assumptions were made regarding the concentration of nitrogen in the process wastewater. To date there has been no nitrogen testing of the Winery's process wastewater quality, however in general Winery process wastewater is assumed to be low in total nitrogen with a typical concentration range between 5 and 50 mg/L, as was shown in Table 2.1. It was assumed that the average total nitrogen %W concentration is 25 mg/L. Further, it was assumed that on average the wetland reduces the concentration of nitrogen in the wetland by 50%. Therefore the average concentration of JESSIE'S GROVE WINERY MAY 2002 21