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i i rf Work of these two Studies was to collect the following information to fulfill EHD and specify the preliminary wastewater management system operational parameters e decentralized wastewater system: alyze the capacity of the indigenous soils under the proposed disposal area to accept nticipated wastewater flows,assess the characteristics of the soil to mitigate nitrate ct, and formulate operational parameters to achieve the two goals of proper wastewater agement and alleviate nitrate loading potential. This was accomplished by soil physical and chemical testing for determination of the following: Physical testing included percolation testing, standard penetration testing, and particle size analysis of the soil characteristics underlying the proposed effluent disposal area. Chemical testing included analyses for constituents that influence nitrate loading. • Extensive analytical testing of the underlying groundwater aquifers from the on-site domestic well was done since an on-site well will be a public water supply until the project connects to the City of Lathrop water lines when they are installed. • Provide preliminary wastewater management operational criteria needed to manage anticipated wastewater flows from the phased project and take advantage of natural mitigation factors to prevent nitrate formation (nitrification) and promote nitrate reduction (denitrification)potential. • Mounding Analysis potential was estimated under the proposed wastewater disposal area to ensure sufficient treatment distance between the soil/effluent interface and the highest anticipated depth to groundwater. Calculated estimates indicate that an acceptable distance will be maintained. r • Although ultimate wastewater flow volumes emanating either from the entire completed project or a portion of the project are unknown, average daily flow volumes were formulated using all available parameters acceptable to EHD. • Details of a proposed wastewater disposal system design for the Phased Project may be completed and submitted to EHD in a separate report. • Provide photo-documentation of the typical subsurface soil characteristics and of the test procedures. 1.2 Subject Site and Surrounding Area Description SSS§ 1.1,3.1,3.2, 3.3,3.4,3.5,3.6 The subject property is 200 feet directly south of the intersection of Roth Road and Manthey Road, on both the east and west sides of Manthey Road. Low density rural residential housing exists around the property, with a new, high density housing three miles south of the property, west of Manthey Road. The Kelley residence has one septic system which has apparently functioned properly since the house was built in the late 1960's. Only one permit for Repair/Additions was found in EHD microfiche files within the one-half mile study area. A copy of this permit is found in Appendix 7. Page -3- Chesney Consulting