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LOGE 1607: Venice Island Ferry Tender's Residence Page 2 April 13, 2016 After the borings were advanced by hand auger and the soils logged, the test holes were completed for the percolation tests. Approximately one inch of pea gravel was placed in the bottom of each open soil boring, followed by a 1.5-inch diameter PVC pipe with perforations on the bottom. Pea gravel was then used to backfill a few inches of the annular space. Live Oak presaturated the percolation test holes approximately 24 hours prior to the percolation testing. Each hole was filled with water to a height of 12 inches above the bottom of the boring for the presaturation. On the day of testing, three of the holes were found to be intact and dry; the 5.75-ft hole was found to contain standing water. Live Oak conducted the percolation tests for the borings on April 8, 2016. Due to soil conditions observed, two (2), one-hour and two (2), four-hour tests were selected. For the one-hour tests, water level measurements were taken every 10 minutes. For the four-hour tests, water level measurements were taken every 30 minutes. The last half hour of each four-hour test was observed by Michael Escotto, Senior Registered Environmental Health Specialist at the SJCEHD. An electronic well sounder with a depth accuracy of 1/100th foot was utilized for the water level measurements. The water level was measured against a fixed reference point on the well casing. Measurements were recorded on the data sheet in decimal feet. When necessary after measuring the water level, the hole was refilled with water to a level of six inches or more above the bottom of the hole. The completed percolation test forms are attached to this letter. The forms for the four- hour tests were signed by Mr. Escotto and indicate the percolation rate for each hole based on the final water drop observed. Details and results of the percolation tests are summarized in the following table and on Plate 3.