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MINOR,- <br /> observation well water levels were measured throughout the testing. In the constant head tests, the <br /> infiltration capacity is measured in gallons per minute (gpm) as water is added to the 10-foot infiltration basin <br /> at the same rate that the water infiltrates out of the basin. Flow rate was measured at the spigots using <br /> containers of known volume and a stop watch. By dividing the rate of flow by the square foot area of the <br /> basin, an infiltration capacity in gallons per day per square foot is calculated. <br /> At the end of the day of constant head testing, the basins were again supplied with a constant flow overnight <br /> to maintain saturated conditions. <br /> For Test Basin Number 1, water level was maintained at 15 inches, and"for Test Basin Number 2 the water <br /> level was maintained between 23 and 25 inches. <br /> 2.3.3 Falling Head Test <br /> v <br /> The falling head tests were <br /> started the day after the Start of falling head test <br /> constant head tests. These tests <br /> were performed by filling the <br /> basin to a specific level (25 „ <br /> inches at each basin) and then " <br /> cutting off the water supply and <br /> observing the rate at which the <br /> water level in the basin dropped. <br /> The falling head tests were <br /> repeated several times (4 .runs <br /> for Test Basin No. 1 and 5�runs <br /> for Test Basin No. 2) by refilling <br /> the basin after the water level" r� <br /> had dropped tothe bottom of the <br /> test basin: In' the falling .head <br /> tests, infiltration is measured in ;,, . <br /> inches per hour. This result is converted to eubic feet per hour and subsequently to gallons per day per <br /> square foot. Wafer levels in the monitoring we were observed at the beginning and the end of the falling <br /> head tests. <br /> 3 FINDINGS AND CONCLUSIONS <br /> 3.1 Subsurface Conditions <br /> The surface elevation at the two test sites is approximately feet, and the bottom of each basin was <br /> located approximately 50 to 60 inches (approximately 4 to 5 feet) below the ground surface. Depth to <br /> groundwater at the sites ranges from 48 to 50.5 feet below the ground surface, depending on the surface <br /> elevation; and groundwater at the site is found in the elevation interval between and feet. Based on <br /> information from the Massachusetts Estuaries Project reports, groundwater is within the Mashpee River <br /> subwatershed of the Popponesset Bay watershed. <br /> 4 <br />