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Percolation Test Procedure: The San Joaquin County Environmental Health Department(EHD) has adopted the following procedure in order to evaluate and process percolation results uniformly, effectively and quickly. Obtain Application for Percolation Test Permit: • Fee is $93.00 per test hole or$465.00 for 5 or more test holes. • Indicate the test hole location(s)on the permit application plot plan. • Percolation Test Hole(s)shall not be located within 100 feet of any well or violate any other set-back requirements for a septic system. • Call (209)953-7697 to schedule an inspection 48 hours in advance. Preparation of Test Hole (s): Preparation of Test Hole (s) for Deep Perc Test: Test Hole Dimensions: Test Hole Dimensions: Diameter=4 inches to 12 inches Diameter=4 inches to 12 inches Depth(Consistent with leach field)=36"-42" Depth=42 inches to 25 feet,Minimum 10 ft above water table • Scratch or score sides to remove any smeared soil surfaces. 0 Pre-soak Test Hole by adding water 6"above selected stratum. • Remove loose material from hole. 0 Maximum water level allowed = 3 ft above selected stratum. • Add 2 inches of course sand or fine gravel. 0 Red Zone area required 25'deep or stratum that meets minimum perc for pit • Saturation: Pre-soak Test Hole 24 hours before test by adding water a testing. minimum of 12 inches over gravel. The EHD is to be notified of start of Percolation Test. PROCEDURE#1 PROCEDURE#2 PROCEDURE#3 If water remains in the test hole overnight If no water remains in test hole overnight Sandy soils(or other soils) in which the first 6 inches of water seeps away in less than thirty • Add clear water to approximately 6 inches • Add clear water to bring depth of water in the (30)minutes after the overnight saturation over the gravel. hole to approximately 6 inches over the gravel. period • From a fixed reference point, measure the • From a fixed reference point, measure the drop in water level over athidy (30) minute drop in water level at thirty(30) minute Refill the hole to approximately 6 inches above period. intervals forff ur(4)hours. refilling 6 inches the gravel. • Calculate the percolation rate in minutes per over the gravel as necessary. 0 From a fixed reference point, take the readings inch." • Use the final reading of the four(4)hour period 10 minutes apart over a one (1) hour period. to calculate percolation rate in minutes per 0 Use the final reading change; calculate inch. percolation rate in minutes per inch. At the time of the percolation test inspection, Environmental Health Staff will: • Review application and parcel map for location accuracy and verify appropriate procedure used. • Inspect test hole construction and review raw field data recorded prior to arrival. • Observe and document the readings during the final 30 minutes of the test on the EHD "Percolation Test Application". • Correct any data on the application and sign the percolation record sheets. Source: Manual of Septic Tank Practice,U.S.Dept.of H.E.W.(1967),as founded and modified for San Joaquin County. San Joaquin County EHD Policy#02-02 EHD 42-02-002 8/7/02 -