SU0006059 SSNL - Laserfiche WebLink

Home Browse Search

rding layer of sand(does not have to be washed) or gravel should be placed on the f the five septic tank excavations if it appears the soil is unstable at the final /pth. Infiltrator emplacement, the soil-effluent interface must be plowed to open the clay soil-effluent interface. Clean, washed sand to a depth of 2.5 inches must be laid down over this scarified soil surface without causing compaction. Clean-outs must be installed at the distal ends of each lateral in the filter bed through what is referred to as"turn-ups" as noted on the Plan Schematics. By using a long"bottle-brush" arrangement,the interiors of the laterals can be cleaned of scum and slime build-up. Water softeners should not be installed because the sodium from water softeners could potentially bind the clay soil and destroy permeability. Although this phenomenon is debated in the scientific / literature, it is my opinion that it is a distinct possibility and should be avoided since it could lead to a decrease in disposal area longevity. The building designer/engineer/architect, the plumber, and the septic system contractor must all coordinate so that the locations of tanks and directions of tightlines are established. If effluent lines cross fresh water or electrical lines, the effluent pipelines must be double encased,per EHD requirements. It is the contractor's responsibility to contact EHD concerning these requirements, which may vary under differing circumstances. Accurate"as-builts" of the septic system to be installed in the future must be supplied to the / Environmental Health Department. All applicable"distance" and"setback"requirements must be strictly followed. It is imperative to recognize that all septic systems and disposal areas have a lifespan. This lifespan is unpredictable due to the numerous operational and environmental factors involved. A critical lifespan issue is controlling the on-site water use as much as possible. This will be accomplished by using low flow toilets and spring-loaded sink faucets. Restricting water use also includes checking for water leaks in toilets, dripping faucets, etc. on a regular monthly basis. Water conservation measures should also be conducted in the kitchen. It is conceivable that during very large events when a high number of Parishioners are expected to attend, that the wastewater pumps may not handle the influent volume. Therefore, for these events (e.g.,The Fall Festival) it is recommended that consideration be given to providing chemical toilets near outdoor activities. Another source of nitrate loading can be from the lawns and landscape-type plants that may be planted over and near the filter bed area. It is recommended not to use any nitrogen fertilizer in this area. If it is deemed necessary to use them, "slow release"nitrogen fertilizers should be used on the lawns and/or landscaping to reduce nitrate loading from the disposal area. Page -17- Chesney Consulting