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SR0077931_OWTS
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SR0077931_OWTS
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Last modified
2/10/2022 1:47:36 PM
Creation date
2/10/2022 1:44:19 PM
Metadata
Fields
Template:
EHD - Public
ProgramCode
2600 - Land Use Program
FileName_PostFix
OWTS
RECORD_ID
SR0077931
PE
2601
STREET_NUMBER
11878
Direction
W
STREET_NAME
CLOVER
STREET_TYPE
RD
City
TRACY
Zip
95304
APN
21226016
ENTERED_DATE
7/17/2017 12:00:00 AM
SITE_LOCATION
11878 W CLOVER RD
P_LOCATION
99
P_DISTRICT
005
QC Status
Approved
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EHD - Public
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supported by any literature or industry practice that I am aware of. Woody/organic material <br />is used to remove nitrate from effluent that has already passed through a nitrification process, <br />such as a sand filter or aerobic treatment unit; i.e., in a two-step process. The proposed plan <br />to use organic material to create a heavy anaerobic organic layer on the bottom of the filter <br />bed will accelerate the sealing/clogging of the soil infiltrative surface, and interfere with the <br />absorption and percolation of wastewater. This is counter-productive to the primary purposes <br />of a septic drainfield which depends on an aerobic soil interface for breakdown of biological <br />matter and bacteria. There is a high likelihood it will lead to premature failure of the filter <br />bed. <br />Unless the designer can supply supporting technical literature and case study examples) to <br />validate this approach, I recommend against approval of this mitigation approach. Instead I <br />recommend a nitrogen removal system capable of 50% nitrogen removal be incorporated into <br />the OWTS design for this project. Per my revised nitrate loading calculations, a 50% <br />reduction in effluent nitrogen concentration would be adequate to bring the nitrate -nitrogen <br />level down to an acceptable level (<10 mg-N/L). An acceptable system would be one with <br />NSF/ANSI 245 certification, of which there are many to choose from. <br />
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