7/27/1989 CONSERVATION COMMISSION Minutes

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i I July 27 , 1988 page 2. { bordering vegetated wetland subject two f;looding and this was predicated on the physical evidence that perhaps there were cranberry ditches within that particular basin or wetland. We at BSc went out there on three different occasions and :looped .into this particular basin and determined that it did not have any hydraulic gradients in it because the ditches themselves were of two types- they were either di cher that held stagnant water, they were ,Interrupted by windfalls, the dropping of vegetation and debris into the ditches which caused them to fill and/or they were interrupted by earthen darns or ramps that were used during the cranberry years to brine sand from the uplands onto the bog itself so that they were discon ,inu us or interrupted and therefore,, there warn' any flow of any type within that particular ditch. Also, the ditches in that bog, in many places, were dry. The bog itself had ditches only in the southeast, easterly and northeast portions. Half of the bog had ditches in ,i t. The ditches, If they occurred within the bock itself, were camouflaged by decaying vegetation and growth of other vegetation that they couldn't be determined so we conducted two very simple experiments. We took a bobber on a no—wind condition, like a fishing bobber, attached a string to it and placed it in the water. Then, we observed what happened to that bobber. The bobber stood still, it didn't move during the period of five minutes. We watched the string on the bottom of the bobber; there was a white string approximately 6 .inches ;lona and we wanted to see if there was any lateral displacement of that string. There was none which told us that there was no subsurface flow within those small isolated pockets of pooled water. We also took a 75 foot clear plastic flexible tube, filled it with dye, placed it in the water and made sure that both ends, one held by one engineer, one held by another engineer, with blue dye in it,, right a the surface of the water and then we looked to see if there was any -differential ,in the level of the water within that tube. Did the blue dye flow out one end Did it flow out the other encs Was there any gradient Was there any tip? Was there any possible flow in that bog itself: We found out that there was no flow. The dye, the level of the water within that tune remained constant. Therefore, we concluded, based on the` fact that the ditches in that bog were discontinuous, interrupted and they were mars—duck and interrupted by earthen d1ke . Where was no gradlerit observed during the two scientific experiments we conducted. We determined that was truly an isolated lana subject to flooding. We have a document that we have produced f o r the Commission tonight and at this time, l would =like t introduce Stan Humphries of IEP who is the team lead on the coastal bank .issue. STAN HUMPHRIES., Let me first say, it is the first chance I 've had to. be before the Corrvriission since, they adopted and had