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SR0083084_SSNL
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Last modified
3/9/2021 12:11:28 PM
Creation date
3/9/2021 12:03:40 PM
Metadata
Fields
Template:
EHD - Public
ProgramCode
2600 - Land Use Program
FileName_PostFix
SSNL
RECORD_ID
SR0083084
PE
2602
STREET_NUMBER
3511
STREET_NAME
JAMIE
STREET_TYPE
CT
City
ACAMPO
Zip
95220
APN
00533001
ENTERED_DATE
12/28/2020 12:00:00 AM
SITE_LOCATION
3511 JAMIE CT
P_LOCATION
99
P_DISTRICT
004
QC Status
Approved
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EHD - Public
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Denitrification Reductions <br /> Denitrification is a process that occurs in the septic system drain field whereby certain <br /> bacteria oxidize the nitrate (NO3) in the wastewater and release nitrogen gas (N2) to the <br /> atmosphere. Due to the biologic processes in the shallow soils, nitrogen in the drain <br /> field may undergo a reduction between 10 percent to 35 percent. Soils with higher clay <br /> content, moist soil conditions, high pH, and organic material denitrify by about 35 <br /> percent, and soils with high sand content tend to denitrify at a lower rate of about 10 <br /> percent. <br /> A denitrification factor of 35 percent was selected for the Site because of the clayey <br /> soils present at the percolation test location. <br /> Nitrate Loading Estimate <br /> A nitrate loading scenario was employed to determine the impact from the proposed <br /> project to ground water. The scenario utilizes the variables discussed previously, which <br /> represent the estimated conditions and uses associated with this project. The following <br /> table presents a summary of the assumptions for the nitrate loading calculation for the <br /> Site, as presented in Plate 13. <br /> Table 3. Assumptions for Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Q 400 gpd Effluent flow rate <br /> Nw 35 mg/L-N Effluent stream concentration <br /> A 2.01 acres Site area <br /> Nb 0.30 mg/L-N Concentration of rain <br /> d 0.35 constant Denitrification factor <br /> R 11.78 inches per year Recharge rate of rainfall <br /> W 2.7 inches per year Uniform waste water loading (calculated) <br /> The details of the nitrate loading calculation are included in Plate 13. The result of the <br /> calculation is presented in the following table. <br /> LOGE 20-56 Page 11 <br />
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