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Nitrate Loading Study Flag City#4 . Lodi, California Irerracon September 20, 2018 ■ Terracon Project No. NA187043 NITRATE LOADING STUDY FLAG CITY#4 5484 W. HIGHWAY 12 (APN 055-160-23) 5198 W. HIGHWAY 12 (APN 055-160-25) LODI, SAN JOAQUIN COUNTY, CALIFORNIA OUR PROJECT NUMBER: NA187043 Our office was contacted by Mr. Tony Alegre, owner representative, to conduct a Nitrate Loading Study (NLS) for the property at 5198 and 5484 W. Highway 12, Lodi, San Joaquin County, California. The formatting of this report has been designed to follow, to the greatest degree possible, San Joaquin County Environmental Health Department (EHD) Nitrate Loading Study Requirements Checklist, dated July 14, 2003. The site is located on an approximately 13.78-acre tract of vacant land comprised of two assessor parcel numbers (APNs) including APNs 055-160-23 and 055-160-25. Based on a review of a site plan dated December 2017 and information provided by Mr. Alegre, APNs 055-160-23 and -25 are proposed to be developed with a truck terminal, heavy equipment storage and construction services heavy yard which will include a 400-square foot office, restroom, septic system, utilities, and limited landscaping. A storm drain pipe is proposed to be connected from APN 055-160-23 to a storm water retention pond located on parcel APN 055-160-73. The site plan also indicated APNs 055-160-21, -43, -44, and -45 are proposed to be developed as an access corridor for the truck terminal. For the purpose of this report, the parcels associated with the access corridor are not included in this study. Because of concern regarding nitrate leaching into groundwater from septic systems, a nitrate loading analysis is required by the EHD for the proposed development to determine the potential concentration of percolating effluent and rain fall over the long term. Where percolating effluent leaches into the ground, groundwater quality may be impacted to some degree should the effluent reach groundwater. The method utilized for the nitrate loading analysis is based on a simple mass balance formula, discussed in a published article by Hantzsche and Finnemore (1992), which provides a convenient and simplified method to estimate long-term groundwater nitrate impacts on an area- wide basis. Hantzsche and Finnemore found that over a long period of time, water quality in the upper saturated groundwater zone closely approximates the quality of percolating recharge waters. They believe that their method is a good planning tool and provides useful information to planners and local officials but with some real limitations. In their article published in Ground Water, Hantzsche and Finnemore mention that "...the equation ignores dispersion, lateral flow, and mixing with groundwater flow from up-gradient areas. These processes would generally Responsive ■ Resourceful ■ Reliable 2