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August 15,2003 <br /> Job Number: LG03-221 <br /> Page 7 <br /> to measure the percolation rate of the soil. Plate 1 identifies the location of the percolation test I <br /> boring. <br /> The percolation test boring was drilled utilizing a 2-inch hand auger drill. The casing used for <br /> the percolation test was 1-1/2-inch diameter PVC pipe with an open end on the top and bottom. <br /> Perforations were made on approximately the last 6 inches of the casing. One (1) inch of"pea <br /> gravel"was placed in the bottom of the hole, the casing was installed, and two (2) feet of"pea <br /> gravel"was backfilled in the annular space. The percolation test boring was pre-soaked on July <br /> _ 2, 2003, 24-hours prior to the test. <br /> One (1)hour percolation test was conducted on July 3, 2003. The percolation test was conducted <br /> in accordance with the requirements of EHD. The one hour pre test and the actual one-hour <br /> percolation test was observed by Ms. Lisa Medina, Environmental Health Specialist of the EHD. <br /> The following table presents a summary of the percolation tests. <br /> Table 4. <br /> Summary of Percolation Tests. <br /> Percolation Test No. Test Depth(ft) Percolation Rate(minutes/inch) Comment <br /> P-1 3.00 12.63 Passed Test <br /> A satisfactory percolation rate is less than or equal to 60 minutes per inch (drop)per EHD <br /> requirements for a shallow test. The percolation tests conducted on the parcel was found to be <br /> satisfactory according the policy of the EHD. <br /> 7.0 NITRATE LOADING STUDY <br /> _ Because of the concern of nitrate leaching into ground water from new septic systems <br /> constructed on the parcel, a nitrate loading analysis was required by the EHD to measure the <br /> potential concentration of percolating effluent and rain fall over the long term. Percolating septic <br /> effluent from each parcel may impact ground water to some degree. <br /> The method utilized for the nitrate loading analysis is based on a simple mass balance formula, <br /> discussed in a published article by Hantzsche and Finnemore (1991),which provides a <br /> convenient and simplified method to estimate long-term ground-water nitrate impacts on an area- <br /> ?pERSO <br /> ♦ 'b <br /> Z W <br /> 9SSOG� <br /> P <br />