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Section No, 13 <br /> rti • <br /> I <br /> Revision No 0 <br /> Date September 5, 1991 <br /> 1 Y i I <br /> Page 2 of 13 ' <br /> 1 <br /> 13 1 3 Water Level Indicator <br /> Preventative maintenance ,procedures for 'the water level indicators are <br /> 1 � <br /> in accordance with manufacturer's instruct4ions'- ',A , <br /> Y� 1 <br /> f ry <br /> _'13 1 4 Dissolved Oxygen Meter , <br /> 1 <br /> Specific procedures` which' should be followed for proper maintenance of <br /> 11 <br /> the Dissolved Oxygen Meter include the following ' �j <br /> t 11 { <br /> k ` ' I ,' ,' 'r I <br /> _■ Replacement ,of;,the;,membrane 'and KCL',solu6.on,'at 2-4 week intervals <br /> y or when excessive bubbles form under the membrane, or when 'erratic �Y <br /> ' , i <br /> measurement/calibration data' is observed <br /> r Storing the membrane in a moist environment when not ,in use <br /> ■ Replacement or reconditioning of the gold, cathode�'should it become <br /> tarnished or when ,it becomes tarnished ' <br /> ■-- ,-Replacement rof- the&batteries at-six month intervals <br /> - I <br /> '13 1 5 Gas Chromatograph <br /> The heart of preventative maintenance for chromatographic instruments is <br /> daily, documented performance checks and calibration Parameters such as <br /> retention times and response factors will be observed and back-checked with <br /> prior operational performance In addition, the following specific <br /> procedures will be- followed <br /> I <br /> ■ GC detectors ,will be cleaned every, month or when performance, as <br /> determined by accuracy and precision determination, begins to <br /> degrade' <br /> r Septa will be routinely,changed <br /> i <br /> I ■ Incoming gas drying cartridges and effluent adsorbent traps will be <br /> routinely changed <br /> I , <br /> 1/ <br /> Ir <br /> 13-2 , <br /> I , , <br />