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Alk <br /> CONTRACTORS LICENSE#764037 <br /> INSTRUMENTATION -CONTROLS-ELECTRICAL <br /> PO BOX 610, ACAMPO, CA 95220 <br />' 209-483-7846— FAX/MESSAGE 209-339-4571-- eric(cDc000ercontrols com <br /> CA OSB CERTIFIED ^-CWEA CERTIFIED <br /> METER CERTIFICATION <br /> Customer Advanced GeoEnvironmental, Inc Service Date 8/19/2004 <br />' 837 Shaw Road <br /> Stockton, CA 95215 Project# 2153 <br /> Attention Mr Bill Little <br /> MANUFACTURER GasTech <br />' MODEL Type 100 <br /> SERIAL# 0126164 <br /> ITEM SERVICED Effluent Flow LEL Detector @ Pacific Ave Minimart-Stockton, CA <br />' DESCRIPTION OF EQUIPMENT LEL Gas Detector(Hexane) 0-40%Test Gas= 100-260 millivolts= <br /> 0-40% LEL <br /> INITIAL CHECK <br /> INPUT DESIRED DISPLAYED DISPLAY <br /> OUTPUT OUTPUT ERROR <br /> % PPM PPM % <br /> 0 000 000 000 <br /> 4000 4000 3500 -1250 <br /> AFTER CALIBRATION <br /> INPUT DESIRED DISPLAYED DISPLAY <br />' OUTPUT OUTPUT ERROR <br /> % PPM PPM % <br /> 0 000 000 000 <br /> 4000 4000 3900 -250 <br /> COMMENTS <br />' Calibrated with 40% Hexane in Air Test Gas Verified System Shut Down @ 10% Adjust Span Pot on <br /> Control Board to Position#9-Sensor May be Failing <br /> 1 <br /> S ice Te c Date Completed <br />' 8/19/2004 <br /> .} <br /> m Mannor <br />