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April 15, 2005 NOA Project Number: E040154A F1 6.4 =Condition of Borings After Presaturation E; After the 24-hour soak period, the presaturated holes were found to be intact on March 22, 2005 - and on April 12, 2005. The deep holes were fotl to be dry,while standing water was observed the shallow holes. 6.5 Percolation Test Procedure Percolation tests were conducted for the borings on March 22, 2005 and April 12, 2005 in accordance with the requirements of the EHD. A percolation test with a duration of four hours was performed.for each hole on March 22, 2005. The final half-hour of each four-hour percolation test on March 22, 2005 was observed by Ms. Linda Turkett, Registered Environmental Health Specialist, EHD. A percolation test with a duration of one hour was performed for the hole on April 12, 2005. The pretest for the percolation test was the first ten minutes,-which then became the first reading. The entirety of the one hour percolation test on April 12, 2005 was observed by Mr. David Van - ' Dyne,Registered Environmental Health Specialist, EHD. Measurement of the water level during the-percoladon test was from a fixed reference point on the PVC casing using an electric well sounder with an depth accuracy of 1/100th foot. All tabulated values on the field data sheet (appendix) are in decimal feet. After water drop was observed, the T = holes were checked for refill. The refill level was approximately 0.5 ft (6 inches) of water above the + bottom level of the percolation test hole. The readings for the four hour tests were taken approximately every 30 minutes for a period of fout'hours. The readings for the one hour test were 10 minutes for a period of one hour. taken approximately every 6.6 Percolation Test Forms and Results - The completed percolation test forms are included in the appendix of this report. f A shallow percolation test is defined by the EHD as being between 36 and 42 inches in depth; a ! satisfactory percolation rate for a shallow test is less than or equal to 60 minutes per inch drop. A deep percolation test is defined as being between 3.5 and 25 feet in-depth; a satisfactory percolation F1 rate for a deep test is 30 min/in or less. One percolation test must demonstrate a satisfactory percolation rate within the proposed septic system`disposal field of each parcel to be suitable for a standard septic system.. Details of the percolation tests are summarized in Table 5. 8 F t -_