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P v e R soti NEIL O. ANT'T'.RSON & ASSOCIATES, INC. GEOTECHNICAL•%► MT NMENTAL•GROUNDWATER•MSPECTIONS TMG•LABORATORY SERVICES CORPORATE OFFICE SACRAMENTO OFFICE Z W 22 Ho w.Iare 4229 NoW rthgam BUeva d,Seim 3 S TO (530)691)301 Lodi,Californiacrem ia 95240 S 'Glifo*Lef5834 l'OCRi'ON (2pq)an.I09I (209)367-3701 (916)929-9267 — RA19cHo MRDovA (916)6314155 FAX:(209)333-8303 FA :(916)929-9261t_ July 18, 2001 N w Our Job No. LG01-115 Mr. Ryan Voorhees zx CRV Enterpirses = 28082 Nichols Road Cn Galt, CA 95632-8204 ^' - Subject: Report Addendum Soil Suitability/Nitrate Loading Study Lot Line Adjustment Involving APN 005-080-22, 23, 24, 25, 26, 27 North Nichols Road and East Bill Road, Galt, California Dear Mr. Voorhees, Per the instructions of Mike Huggins, Supervising Environmental Health Specialist, San Joaquin County Public Health Services, Environmental Health Division, our office was directed on July 16, 2001 to include a calculation for a second dwelling unit for nitrate loading projects conducted in San Joaquin County. This work was performed for your project. A second dwelling unit can be constructed on a given site in the county and can be up to 1500 sq-ft, consisting of three(3)bedrooms. This letter is an addendum to the soil suitability- nitrate loading report dated May 25, 2001, which provides the additional calculation and recommendation required by Mr. Huggins. Nitrate Loading Analysis The quantity of household waste water was estimated to be 50 gallons per person per day. In a four(4)bedroom residence, the typical occupancy of the main residence would probably range between two to five (5)persons resulting in a daily waste water flow between 100 to 250 gallons per day(see Table 1). The potential impact of a legally permitted second dwelling unit containing three(3)bedrooms is estimated to include an occupancy of three(3) additional people to the property. The average nitrate concentration of the typical residential septic waste is normally considered to be 45 mg/L-N.' Table 1 presents the quantity of effluent associated with a four(4) bedroom residence with the addition of a second dwelling unit. 1 Otis,R.J.,Boyle,W.C., 1980,Design manual,onsite wastewater treatment and disposal systems:U.S. Environmental Protection Agency,EPA 625/1-80-012. (See page 100,table 6-1).