Laserfiche WebLink
26440,8875,&8925 Thornton Road Project No.2017-00010 Page 18 <br /> 4.5 Nitrate Loading <br /> A nitrate loading scenario was performed to determine the impact from the proposed <br /> project. The scenario utilizes the variables discussed previously which represent the <br /> estimated conditions and uses associated with this project. The following table presents a <br /> summary of the nitrate loading calculation for the parcel. <br /> Table 3. <br /> Summary of Nitrate Mass Balance Analysis. <br /> Parcel' Result Acres Average Daily Flow Effluent Leachfleld Deep Percolation <br /> (Nc)* (A) (Q) Concen- Denitrifi- of Rainfall(R) <br /> (mg/L-N) 's, - (gpd) tration(Nw) cation(d) (Plate 6) (in.) <br /> s. J (mg/L-N) <br /> 1 47.5 2.37 6,089 85.00 35% 5.76 <br /> * Maximum contaminant le ,el (MCL) for nitrate in drinking water is 10 mg/L-N. <br /> 1 Parcel includes 22440 N.Thl, nton Road,8875&8925 W.Thornton Road parcels. <br /> 4.6 Impact of Nitrate Loading to Nearby Water Sources <br /> Based on the methods and assumptions described,in addition to our professional judgement <br /> and geologic setting, we believe the proposed projects will cause a build-up of nitrate in the <br /> ground water above 10 mg/L-N over the long term. <br /> Based on the relatively flat topography of the site, we do not foresee percolating effluent <br /> affecting any surface water resources. <br /> 5.0 DISCUSSION OF NITRATE LOADING RESULTS <br /> 5.1 Total Nitrate Impact <br /> Due to the lack of a groundwater well on site, no water sample was analyzed for nitrate.The <br /> nitrate maximum contaminant level (MCL) set by the US EPA is 45 mg/L-NO3 or 10 mg/L-N. <br /> This report concludes that the proposed commercial development of a Shell service <br /> station/mini-mart/fast-food restaurant and CFN fueling station,will result in approximately <br /> 6,089 gallons per day effluent into the proposed septic system. The proposed commercial <br /> development will result in a nitrate load of 47.5 mg/N-L and, without mitigation, cause a <br /> long-term build-up of groundwater above 10 mg/L-N. <br /> Nitrate in ground water occurs as a result of the application of fertilizers, livestock waste, <br /> and untreated septic tank waste. Nitrate is mobile and often accumulates in the shallow <br /> ground water zones.The proposed development is located within a shallow depth to ground <br /> water zone surrounded by septic use parcels in the near vicinity and agricultural use in the <br /> general region. The use of public water for drinking water provided by the San Joaquin <br /> Petralogix Engineering,Inc. <br /> 26675 Brueila Road,Galt,Ca 95632 <br /> t (209)-100-5729 <br /> www.petralogix.com <br />