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Donb a Ring Infiltrometer Tests In addition to the conventional percolation tests referenced above, double ring infiltrometer tests were conducted also near.the center of each Dispersal Area. The double ring tests were done under ASTM Test.Method for Infiltration Rate of Soils in Field Using Double-Ring Infiltrometers - D3385. The infiltrometer test measures one-dimensional incremental infiltration velocity, which is the quantity of flow per unit area, over an increment of time(cm3 _cm2 I sec). Infiltration is the downward entry of liquid into the soil and is measured by the infiltrometer. This test method involves driving two open cylinders, one inside the other, into the soil and then filling the rings with water. The purpose of the outer:ring is to promote one-dimensional, vertical flow beneath the inner Ting. The volume of water added to the inner ring to maintain the liquid level constant with the starting value, is the measure of water that infiltrates the soil.' The inner and annular spaces were presaturated with 12 inches_of water the day before testing. No soil cracking was observed in the soil'surface. Water volume of during 30 minute.intervals for four hours is converted to an incremental infiltration velocity.expressed in centimeters per hour(cm/hr), cm/sec and min/in, as illustrated in Tables below. The infiltration test for Dispersal Area#1 was done 81n. below the ground surface. The infiltration test for Dispersal Area#2 was done at 20 in. below grade. Thesedepthsrepresent potential soil-effluent interfaces'for:a drip disposal system. Test results for.Area#1 indicate relatively rapid rates with.some fluctuation over the four hr test period and a relatively small decrease in infiltration rate. Area#2 demonstrated comparatively,slow infiltration and considerable slowing of water infiltration after the four-hour test period. °The infiltration test results are summarized below. As with the:percolation testing; the infiltration test conducted in 2006 is also included. TABLE G INFILTRATION TEST RESULTS PROPOSED DISPERSAL AREA.#1-AND AREA#2 DISPERSAL, �A'#1'` Tune5,2008 w * DISPRSALARE" #2= ne6;2008 ".8 Inches a ow-Grade.., 20.Inches,B.. rade + INFILTRATION RATE IN INFILTRATION RATE IN l �WHR,CM/SEC AND MINAN CM/HR,CM/SEC AND MINAN 81c i; 0781 cm/sec,54.2 min/in T6�g0"72— r 0.0002 cm/sec,211.7 min/in -� 0.390 gallons/ft'/da =APPLICATION RATE WIallons/ =APPLICATION RATE TABLE 7 INFILTRATION TEST'':RESULTS NEA t:SWC aAUGUST.11, 2006 ,- 12 Inches Below Grade INFILTRATION RATE IN CMIHR,CMISEC AND MIN/IN 1.79 cm/hr,0.000497 cm/sec,85.1 min/in 0.225 gallons/ft'/day=APPLICATION RATE Page-6- Chesney Consulting