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Page 5 of 6 <br />either the soil conditions have changed, which is unlikely, or <br />the original soil testing information relied upon did not reflect <br />actual conditions at the site. <br />e) It is unlikely (but feasible) that your residential water use <br />exceeds the 450 gallons per day design capacity of the system. A <br />water meter and pump cycle counter could likely be installed to <br />verify your water usage. <br />Potential remedies to the problem: <br />Given the seasonally saturated soil conditions now known to exist at <br />the drainfield site, a mound -type drainfield would seem to be the <br />appropriate drainfield system for this property as a permanent solution. <br />However, *here are a number of modifications to the system which might have <br />some benefit, in prolonging the life of the existing trench system: <br />1. Place additional fill over the east end of the system, to a <br />depth of 12-18" over the top of the rocks in the trenches, and <br />extending perhaps 20' easterly from the ends of the trenches. <br />Also, fill over the cover of the distribution box. This will <br />"force-feed" the trench system and help ensure that the entire <br />trench system is being used to its full extent. This method may <br />or may not be successful in stopping the overflow, but is the <br />least expensive approach to start with. <br />2. Provide additional trenches, constructed in fill just east of <br />the existing system, with the bottom of the new trenches just a <br />few inches into the original surface soil, which is normally <br />relatively permeable compared to the deeper soils. While these <br />added trenches might not quite meet the required V vertical <br />seperation from the seasonal water table, they would likely have <br />some benefit in relieving the pressure from the main system <br />during times the soils were saturated. <br />3. A curtain drain around the perimeter of the existing system <br />could likely be designed to intercept surface and groundwater <br />that flows laterally through the drainfield site, but would <br />likely not have the effect of permanently lowering the water <br />table to a point 3' below the trenches, because it appears likely <br />that a majority of the excess water in the drainfield area is a <br />result of direct vertical infiltration from rainfall and <br />excessive snow meltwater from the relatively large drifts which <br />occur over the drainfield due to the location of trees north and <br />west of the drainfield. <br />With each of the 3 potential solutions outlined above, there is .. <br />comparative risk that each modification individually or all 3 collectively <br />