Laserfiche WebLink
NitrateLoadingStudy 1rerracon <br /> Rowe Property m Lodi, CA <br /> November 6, 2017 â– Terracon Project No. NA177059 <br /> NITRATE LOADING STUDY <br /> ROWE PROPERTY (APN 061-140-64) <br /> 12360 N. ANGIER ROAD <br /> LODI, SAN JOAQUIN COUNTY, CALIFORNIA <br /> OUR PROJECT NUMBER: NA177059 <br /> Our office was contacted by Ms. Donna Rowe, site owner, to conduct a Nitrate Loading Study <br /> (NLS) for the property at 12360 N. Angier Road, Lodi, San Joaquin County, California. The <br /> formatting of this report has been designed to follow,to the greatest degree possible, San Joaquin <br /> County Environmental Health Department (EHD)Nitrate Loading Study Requirements Checklist, <br /> dated July 14, 2003. <br /> The site is located on an approximately 1.0-acre parcel developed with an existing 2,400 square <br /> foot(SF)three bedroom two-and-a-half-bathroom residence, on-site septic system, utilities, shop <br /> buildings, swimming pool, and landscaping. Based on interviews with Ms. Rowe, the site is <br /> proposed to be developed with an approximately 1,500 SF two bedroom two-and-a-half-bathroom <br /> residence and an additional septic system. The proposed residence location had not been <br /> determined at the issuance of this report. <br /> Because of concern regarding nitrate leaching into groundwater from septic systems, a nitrate <br /> loading analysis is required by the EHD for the proposed development to determine the potential <br /> concentration of percolating effluent and rain fall over the long term. Where percolating effluent <br /> leaches into the ground,groundwater quality may be impacted to some degree should the effluent <br /> reach groundwater. <br /> The method utilized for the nitrate loading analysis is based on a simple mass balance formula, <br /> discussed in a published article by Hantzsche and Finnemore (1992), which provides a <br /> convenient and simplified method to estimate long-term groundwater nitrate impacts on an area- <br /> wide basis. <br /> Hantzsche and Finnemore found that over a long period of time, water quality in the upper <br /> saturated groundwater zone closely approximates the quality of percolating recharge waters. <br /> They believe that their method is a good planning tool and provides useful information to planners <br /> and local officials but with some real limitations. In their article published in Ground Water, <br /> Hantzsche and Finnemore mention that "...the equation ignores dispersion, lateral flow, and <br /> mixing with groundwater flow from up-gradient areas. These processes would generally <br /> contribute to additional reduction of nitrate-nitrogen concentrations in groundwater to the extent <br /> that the nitrate-nitrogen concentration of groundwater flow from up-gradient areas is lower." <br /> Responsive . Resourceful . Reliable 2 <br />