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4 of 8 <br />a. Mount the Garmin chartplotter on the bracket mounted on the boat rail. The Garmin <br />chartplotter will face the interior of the boat. <br />b. From the Home screen, select ‘Combos’ and then ‘Biosolids Survey’. <br /> <br />c. Use the minus (-) button to decrease maximum pond depth to 10 feet if the Garmin does <br />not automatically adjust to that depth. <br />d. The brightly colored line above the contour indicates the top of the sludge blanket. The <br />depth from the bottom of the transducer to the top of the sludge blanket is displayed in the <br />top left corner of the screen. When the value is flashing, the transducer is unable to locate <br />the top of the sludge blanket and is flashing the last known value. Drive to a new location, <br />clean the transducer, and/or power cycle the Garmin to troubleshoot. <br />e. Maneuver the boat around the lagoon, observing the contour and thickness of the sludge <br />on the Garmin chartplotter. <br />f. If collecting solids blanket data, travel through the entire lagoon a few times to collect an <br />adequate amount of data. <br />g. If collecting lagoon liner data, measure the liner depth at a minimum of one hundred points <br />throughout the monitoring area according to the following steps: