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t INTRODUCTION The Soil Suitability Study Addendum is submitted to the San Joaquin County Environmental Health Department(EHD) to fulfill the EHD requirements for this project. Typically, a percolation test must be conducted on every parcel undergoing a Minor Subdivision, unless the Parcel is designated as a"Designated Remainder." This is also in accordance with the California Department of Real Estate regulations in which subdivided parcels not under municipal sewer must be shown to be buildable lots with regards to wastewater effluent management. In May 1992, a Soil Suitability Study was conducted for the subject property by Walter Curtis, PE, which is attached. Consequently, my Report is referenced by EHD as an Addendum and only addresses percolation testing on the proposed Homesite Parcel (Parcel 2). No percolation z testing was required on any other Parcel for this project, nor was testing of any domestic well on the subject property required by EHD. FINDINGS Percolation testing was conducted on the proposed Homesite Parcel where Mr. and Mrs. John Polk reside. The test location is illustrated on the attached Google aerial photo. A Log of Boring using the Unified Soil Classification System(U.S.C.S.), as observed in the two perc test borings, is found on the EHD PERCOLATION TEST DATA SHEET. Generally, the underlying surface soils show a consistent silty clay soil down to two ft, with increasing fine sand and silt concentrations with increasing depth. No cemented silts hardpan soil stratum was discernible in the test borings. The following information describes the preparation of the percolation test borings and the actual percolation testing: On September 14, 2013, a shallow perc test boring of 42 inches and a deeper boring of 80 inches 0,.z) were hand-drilled. The sidewalls of the shallow boring were scored with a pry-bar and the loose material removed. Two inches of fine gravel was placed at the bottom and a three-inch perforated PVC pipe was inserted into each test boring. On September 19, the borings were pre- saturated with 12 inches of water approximately 24 hours before the start of testing. On September 20, 0630 hrs,percolation testing commenced. There was no standing water after the 24-hour soak period in the perc test borings. Consequently, EHD Perc Test Procedure#2 was conducted for each test boring. �(o•5J The last half hour of the test was witnessed by Mike Escotto, R.E.H.S. of the San Joaquin County Environmental Health Department. The maximum acceptable perc rate is 60 min/in for shallow perc tests and 30 min/in for the medium depth perc test borings. Perc rates in both test borings 6-7) passed. Page 2 of 4