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A number of inspection ports are installed into the system to allow for observation of water levels. One inspection port is located in each end of the disposal trenches. This port allows a visual observation of the bottom of the trench and should reveal any ponding effluent. Other ports are located downslope of the disposal field and may allow for the measurement of seasonal ground water if any exists at the site. ON-SITE SEPTIC SYSTEM INSPECTION Septic Tank The septic tank should be inspected by the homeowner or a professional septic tank pumping contractor approximately once per year for sludge accumulation and should be pumped as necessary to prevent sludge from entering the disposal trenches. The tank should be pumped when the sludge accumulates to within 12-18 inches of the bottom of the inlet structure (TEE). The septic tank will require less frequent pumping if the amount of solid material introduced into the septic tank is minimized. Solid materials such as food scraps and vegetable trimmings should be disposed in the garbage or a compost pile. Grease should not be poured down the drain, but rather collected and disposed in the garbage. Paper products such as disposable diapers, kleenex, sanitary napkins and paper towels are also harmful and should be disposed in the garbage. Garbage disposal units are stronaly discouraged. For more information concerning septic tanks and pumping procedures, contact the designer or a qualified septic tank pumping contractor. Failure to pump the tank when necessary may result in clogging and/or premature failure of the disposal trenches. The pump tank has been fitted with a screened pump vault which requires periodic rinsing to function properly. It is recommended that, at a minimum, the screened pump vault be removed (simply lift it out of its protective enclosure), rinsed clean and replaced every time the tank is inspected for sludge accumulation.