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LOGE 1616: Lenzi Lantz SSS Addendum Page 2 April 19, 2017 Preparation and Presaturation of Percolation Test Hole After the borings were advanced by hand auger, the test holes were completed for the percolation testing. Approximately one inch of pea gravel was placed in the bottom of each open soil boring, followed by a 2.0-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 each 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, all the percolation test holes were_ found to be intact. The shallow holes on Parcels 4 and 5, as well as the deep hole on_Parcel 7 were found to be dry; standing water was present in the shallow holes on Parcels 6 and 7. Percolation Test Procedure Live Oak conducted the percolation tests for the borings on April 10, 2017. Due to soil conditions observed, four-hour tests were selected. Water level measurements were taken every half-hour during this four-hour period. Michael Escotto, Senior Registered Environmental Health Specialist at the San Joaquin County Environmental Health Department, observed the last half-hour of each test. An electronic well sounder with a depth accuracy of 1/100`h 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. Percolation Test Results The completed percolation test forms are attached to this letter. The forms were signed by Mr. Escotto and indicate a percolation rate for each hole based on the final water drop observed. Per San Joaquin County Environmental Health Department's definition, a shallow percolation test hole has a depth between 36 and 42 inches; a satisfactory percolation rate for a shallow test is less than or equal to 60 minutes per inch (min/in) drop. A deep percolation test hole has a depth greater than 3.5 up to 25 feet; a satisfactory percolation rate for a deep test is 30 min/in or less. For the Site to utilize a standard septic system, one percolation test (either a shallow or deep test) must demonstrate a satisfactory percolation rate within the proposed septic system disposal field. Details and results of the percolation tests are summarized in the following table.