Engineer Letter, Construction Status

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Additinally, the condition of the lakeshore bank was very poor. The creosote soaked timber walls had deteriorated, became unsightly and posed a pollution concern. The 15 foot bank north of the timber walls had about a 1:1 slope, was sparsely vegetated ai ^ eroded. The plan Is to flatten the yard grade from the walkout level to about 34* and leave a 4-5 foot bank along the lake. The bank would be stabilized by rip-rap along the lakeshore and by proposed and existing vegatatlon. The timber and lannon stone walls would be replaced by field stone to stabilize all steep slopes. The old wall removal will total about 55-60 square feet of Imprevlous surface while the proposed field stone walls allow water to filter back into the earth. The upper level of the proposed field stone wall follows the same location as the original lannon stone wall before It ties back Into the house. The wall Is stepped down to provide a more stable and pleasing transition between levels. All yard areas would be grassed or planted with shrubs. Shrub beds would be mulched and use a geotextile fabric underlayment to maintain a pervious ground surface. The total Impact would improve lakeside conditions by: - reducing the velocity of storm water runoff by flattening the 1:1 slopes to about 4% over a grassed area, thereby minimizing sediments reaching the lake. - Stabilizing all steep slopes. - Eliminate Impervious surface. - Improve ground water recharge. - Eliminate a pollution concern (creosote timbers). - Preserve a stand of mature oak trees by the house. - In general. Improve the aesthetics and condition of the lakeshore. The excavation and grading also eliminates a flooding concern for both Todd Waters and Jack Dennis. The front yard areas (between the home and street) for both are low and have been subjected to flooding over the years. A number of lots In the area currently drain to their lots. Mr. Dennis, who has the lowest lot, has Indicated a notlcable Increase over the years In the amount of water accumulating In his yard. He attributes it to added hard surface coverage on adjacent proprtles and runoff from Casco Point Road when storm sewers plug. Hr. Mr. Dennis does have a sump type catch basin with ai’ 8 Inch pipe leading under his house to the lake. This provides some drainage but his driveway and yard do flood during heavy rains and spring runoff. Creating an access problem for him and potential^ for emergency vehicles. The original house on the Todd Waters lot also had a catch basin and pipe located In the front yard which drained to the lake. This has been removed with construction of the new home. Prior to the lake side excavation, there was no natural storm water overflow protection to prevent flooding of both the Waters and Dennis homes. Mr, Dennis noted that during the recent storm, flood water was within about 2 inch of coming Into his house and was flowing about one foot deep through the excavated opening between his and Todd Waters new house. The excavation along the north side of the new house and opening to the lake provides an elevation low enough to allow positive surface water drainage from the Waters' front yard and overflow protection for the Dennis home. The only storm sewer required will be a pipe under the driveway. The grcssed swale between the homes will be about 2% with width sufficient to allow smooth grade transition between properties. The wider grassed yard opening to the lake would then disperse water over a larger, flatter surface area to reduce runoff velocity, collect sediments and minimize erosion.