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SR0083913_SSNL
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SR0083913_SSNL
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Last modified
7/21/2021 3:07:20 PM
Creation date
7/21/2021 2:44:02 PM
Metadata
Fields
Template:
EHD - Public
ProgramCode
2600 - Land Use Program
FileName_PostFix
SSNL
RECORD_ID
SR0083913
PE
2602
FACILITY_NAME
21718 N CORD RD
STREET_NUMBER
21718
Direction
N
STREET_NAME
CORD
STREET_TYPE
RD
City
CLEMENTS
Zip
95227
APN
023200050
ENTERED_DATE
6/29/2021 12:00:00 AM
SITE_LOCATION
21718 N CORD RD
P_LOCATION
99
P_DISTRICT
004
QC Status
Approved
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EHD - Public
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The results for the deep percolation at the site were 3.63 in./year for the 3.98 acre Financing <br />Parcel. The deep percolation rate for the 83.43 acre Designated Remainder Parcel is 3.63 in./yr. <br />The nitrate concentration is estimated to be about 1 mg/L-N for the rain concentration. (Hantzche <br />and Finnemore, 1992). <br />5.3 Description of all current on-site sources of nitrate to soil and groundwater and the <br />contribution of nitrate load from these sources to the project site: The sources of nitrates are <br />the existing septic systems in use by an existing parcel for residential uses. The existing septic <br />systems were accounted for when determining the approximate nitrate concentration, the site is <br />expected to maintain its current flow with the proposed development. <br />5.4 Discussion of all proposed future on-site sources of nitrate to soil and groundwater and <br />the contribution of nitrate load from these sources to the project site: The future use of the <br />site will remain consistent. The existing residence with 3 bedrooms was used to approximate the <br />amount of people that could generate wastewater flow. It was conservatively assumed that 100 <br />gal/day would be generated for the first bedroom and 50 gal/day subsequently for every other <br />room, generating at a total of 200 gallons/day. The site is expected to be able to handle up to 340 <br />gallons/day, making the current flows sustainable. <br />There is a residence on the proposed 83.43 acre Designated Remainder Parcel, 250 gallons/day <br />were used for the four bedroom house. The proposed 83.43 acre Designated Remainder Parcel <br />would have no problem with these small flows, but no major additions should be made without <br />update to this report. <br />There will be a residence on the 3.98 acre Financing Parcel, 200 gallons/day were used assuming <br />a three bedroom house. The 3.98 acre Financing Parcel would have no problem with these small <br />flows, but no major additions should be made without update to this report. <br />The average total nitrogen concentration of domestic wastewater is about 20-85mg/L-N, <br />although 35-45mg/L-N is a better approximation (Crites and Tchnobanglous). The value selected <br />for this site was 45mg/L-N assuming this site shall experience a larger concentration. <br />The site will experience a process of denitrification as the soil naturally treats surface material <br />through natural forms. Denitrification is a process that occurs when bacteria uses oxygen in the <br />nitrate (NO3) and release nitrogen (N2) into the atmosphere. Denitrification can be variable to <br />the type of soils, chemical properties, moisture content and other variables. Based on the sandy <br />loams on site and the high percolation rates, this site's soil has moderate levels of denitrification. <br />It is expected that a site with soil of these characteristics shall have approximately about 10-15% <br />of denitrification. The value used for this site was 15%. <br />5.5 Calculate mass balance of nitrogen loading considering all potential sources identified <br />using Hanztch/Finnemore equation: Using the data mentioned within this report and the <br />attached Soil Suitability Report the mass balance of nitrogen loading for this site was calculated, <br />this was done using Hanztch/Finnemore formula. Based on the Hanztch/Finnemore equation this <br />3.98 acre Financing Parcel would contain a Nitrate Load (Nc) of 6.85 mg/L-N when the site is <br />generating its peak flows. The 83.43 acre Designated Remainder Parcel would generate 1.33 <br />mg/L-N. <br />
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