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LOGE 2138 : Rosas Percolation Testing Page 2 June 30 , 2021 A standard four- hour test was selected . Water level measurements were taken every 30 minutes during this four - hour period . Francisco Garcia Ruiz , Registered Environmental Health Specialist at the San Joaquin County Environmental Health Department , observed the final 30 minutes of the percolation test . An electronic well sounder with a depth accuracy of 1 / 100`h foot was utilized for the water level measurements . The water level was measured against a fixed reference point on the well casing . Measurements were recorded on the data sheet in decimal feet . When necessary after measuring the water level , the hole was refilled with water to a level of approximately six inches above the bottom of the hole . Percolation Test Results The completed percolation test, form is attached to this letter. The form was signed by Mr . Garcia Ruiz and indicates a percolation rate for the hole based on the final water drop observed . Per San Joaquin County Environmental Health Department ' s definition , a shallow percolation test hole has a depth between 1 . 5 and 3 . 5 feet ; a satisfactory percolation rate for a shallow test is greater than 1 minute per inch (min/ in) but less than or equal to 60 min/in drop . For the Site to utilize standard septic systems , one percolation test hole must demonstrate a satisfactory percolation rate within approximately 100 feet of the proposed septic system disposal fields . Details and results of the percolation testing are summarized in the following table . Table 1 . Percolation Test Summary Test No . , Percolation Percolation Test Duration Comments Date Tested Test Rate (see note) Depth (ft .) (minutes/ inch) P1 - S , Satisfactory 6/29/21 2030 5 . 95 4 hr . perc . rate' Shallow Test Note : A satisfactory percolation rate for a " shallow" test is greater than 1 min/in but less than or equal to 60 minAn . 1 Per San Joaquin County Environmental Health Department , a rate between 5 . 0 and 30 . 0 min/in requires an eight-foot separation between the bottom of dispersal system and ground water, or mitigation by system design or enhancement . The soils on the Site have demonstrated a satisfactory percolation rate for the use of standard septic systems in accordance with the requirements of the San Joaquin County Environmental Health Department . The percolation test is considered representative of soils within an approximate 100400t radius of the test location . Because of the percolation rate between 5 . 0 and 30 . 0 min/in encountered in each test hole , the San Joaquin County Environmental Health Department will require an eight -foot separation from the bottom of the dispersal system to ground water. Ground water is anticipated to be encountered approximately 50 feet below ground surface at the Site , so no modification to standard systems should be required .