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1 <br />Fj <br />the house, nuisance odors, or seepage on the ground. When septic tank <br />problems finally manifest themselves in these ways, they have generally <br />' been building up for a long time. The efficiency of the septic tank may <br />have been impaired for years, possibly causing contamination of the <br />groundwater. Other underground problems, such as the flow short-circuiting <br />' the drainfield resulting in direct percolation, may never exhibit outward <br />signs of a failed installation. Therefore, even though many residents may <br />' claim to have never had any problem with their septic tanks, this does not <br />mean that the installations are operating efficiently and not polluting <br />' groundwater. Figure 4-3 shows a proper septic system installation and <br />three improper installations. <br />Ij <br />C <br />IRC.VB4 <br />6/4/87 <br />4-16 <br />