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0 <br />September 17, 2021 <br />FOR: San Joaquin County Environmental Health Department (EHD) <br />Mr. Steven Shih, REHS, Program Manager <br />1868 Hazelton Ave. <br />Stockton, CA 95205 <br />(209) 468-9850 <br />PROJECT: 17454 Von Sosten Road <br />Tracy, California 95304 <br />APN 209-460-10; SR0081254 <br />SUBJECT: Soil Suitability/Nitrate Loading Study Addendum <br />INTRODUCTION <br />Reference is made to the project indicated above. Mr. Paul Raj, President of Chadha Construction Company, <br />Inc. is building a second unit dwelling (a.k.a. Accessory Dwelling Unit -ADU) at the project address. This <br />structure is approximately 90% complete. Although this structure has three rooms, only two rooms have <br />closets and is therefore a two bedroom ADU, as personally inspected. The existing, original single family <br />residence is a four-bedroom structure. <br />On August 30, 2019, Advanced GeoEnvironmental (AGE) submitted to EHD a Soil Suitability/Nitrate <br />Loading Study (SSNL) and an Addendum to this Study dated November 4, 2019. The original Study and <br />Addendum found the nitrate loading from the existing residential structure and the ADU on the 1.67 acre <br />Parcel to be 17.98 mg/L Nitrogen; 7.98 mg/L N over the Maximum Contaminant Level (MCL) of 10 mg/L N. <br />In the intervening time, a number of changes have occurred in both the methodology and calculative <br />parameters in conducting these Studies. Consequently, Mr. Raj contracted with Chesney Consulting to <br />complete this Addendum to the two original Studies. Under the new parameters, and additional <br />information/data secured for this Report, it has been determined that the revised nitrate loading for this project <br />is now under the MCL at 9.2 mg/L N. In addition, the EHD also required documentation illustrating that <br />sufficient area exists for both the primary and 100% replacement/reserve areas for both onsite structures, <br />which is discussed in the Conclusions Section of this Report. <br />SOIL INFORMATION <br />Soil chemistry data was not conducted for the original Studies. Soil chemistry and textural analyses are <br />important parameters in assessing nitrate loading from any project. An onsite backhoe was excavating three ft <br />deep trenches for water and gas lines to the ADU. A soil sample was obtained from this depth, which will be <br />the approximate depth of the filter bed soil -effluent interface when installed. <br />Table 1 below illustrates the soil characteristics of the soil sample retrieved from the project site: <br />Page 1 of 7 <br />P.O. Box 3794 ❑ Turlock, CA 95381 ❑ 209.402.1652 <br />❑ ddchesney(a charter.net <br />