it's time to call the order and over Inland wetlands and Water fores Commission for November 4th 2024 we're g to have to first start off by seating our alternate Brad Kell right yes okay so be a commissioner tonight with us Brad Kelly commissioner [Music] CH [Music] probably we got a couple of things we have here there's no changes to the order of the agenda we have to approve the minutes from September [Music] 10 the regular meeting minutes we could hold off on that too because two of the AR there okay Okay we okay good no public [Music] comment public here oh this is on is this being recorded there's no there's nobody all right and here we are we want to we've got a permit application IWC number 2410 Eric Anderson town of Andover for the B Bunker Hill load replacement of an existing Bunker Hill bridge over the sh put this in try to put this in slideshow mode and see if I can remember everything about notes all right all right I'm Greg with post Miller consultant the aison for this town of Andover project to replace Bridge 4583 which carries Bunker Hill Road over hop River it is a state DOT administered project it's 100% ferally funded so just want to note that you know good information to the town that's it project location I think you guys are
probably pretty aware across the street Bunker Hill Road over hop River tenth of a mile from Route Six probably two times from here here a aerial view see Scotts tree farm on the Southwest and that's really the biggest property of note in this rural area all right so the purpose of the project is the deterioration condition of the multiple culber structure there's rust and deterioration below the water line perforations Bo deflecting in 2021 several storms came in and actually a couple of them over top of structure and you can see in the the bottom picture there that some of the roadway was washed away and temporary repairs were required so those are in place in the current condition going fast the current condition is in this upper slide where it's reduced to a single Lane to keep people off the off the shoulders the temporary player repairs in place so it was originally built in 1960 it was rehabilitated 1988 which included adding a third cover pipe there were only two to start the one on the right see looks a little different is the third cover pipe it's a triple barrel as asphalt coated corated metal pip Arch Clover differing sizes they're all about 15 to 16 feet in diameter with reinforced concrete head walls the average daily traffic over the bridge is about 330 Vehicles the drainage area to the site is 58 square miles which is decent decent sized and it's currently under design for design flows that contributes to the over topping all right so we got a couple pictures of the of the bridge this is from
Downstream you can see some sedimentation Downstream this is Upstream so looking Downstream that's the inlet that's looking Upstream from the bridge Downstream from the bridge there's the parking area on the the left there which is the north side for for Anglers and river access this is top of the bridge showing that it's it's stop controlled at this point and you can see the parking area for the river access as well and this is looking the other way Scot Stree Farm towards Route Six so this project is located within a FEMA 100e flood plane as well as a regulated floodway the floodway is shown as the the white quarter down the middle and the the Shaded area is the 100e flood plane to note the the flood plane here is quite wide several hundred feet wider than the bridge you can see the you know the bridge is pretty small compared to the flood plane here all right so this is this shows the termination of Bank full width so ordinary had water is shown here as well as was delineated by the certified soil scientist to know there's no in the wetlands on site there's no federally regulated or state regulated weapons on site for the soil scientists
so just the water course the bank for width is important in determining how we size the bridge so Army Corps recommends sizing at least 1.2 times bankful width or 20% greater than Bank width to maintain a natural Channel Through the bridge which we're doing for the proposed condition but just to show you that this is measured you know somewhere 63 64 65 the average for the Bank full width and that's shown again here this is the proposed Bridge replacement there a lot of construction information on this you know on the slide but what's important is that we're removing the multiple opening structure and replacing it with a clear span natural bottom structure opening up for Hydraulics allowing a lot more flow through the bridge it's it's 370 Square ft in the exist existing condition and there's 700 and some odd square feet in the in the proposed condition so nearly doubling the hydraulic opening that's existing this also allowed for raran shelves to be constructed to allow Critters to pass Wildlife to pass under safely that black and green yeah so you see how that the the embankments go up underneath the bridge and then they level off and there three foot sections on each side so those those sections are you know flat area for the for wildlife to pass safely without having to go over the road another thing to note is there's rip wrap so you've got granular fill with rip wrap on top on either side and then a foot of natural stream bed material on top of that so rip wrap will see in the plan view on the embankments
for embankment protection and this a based on velocity calculations for fhwa for for stabilizing embankments and this and through the bridge the tow in you see is creates like a wedge for scour protection so that's you know with Bridges failing these days that's pretty important is you get the the the toe below the design scour calculated and that way it won't undermine the bridge is the is the U guard is that going to be open that yes the so the open Bridge rail allows really some relief for over topping but it's the the roadway will be updated for Federal standards you know so the bridge Rail and there's also guide rail that extends off the
four corners or I should say three corners the South or the northwest side is has a concrete end block and wall to to knock the block the access to the the river access so the GU didn't extend there's a concrete wall there instead on that side and it was one thing I notic you wrote something you were changing the angle one of the sides yeah so the West yeah the West abutment is was kind of skewed to the the channel and in the new configuration it will be parallel they just straight North and South I think the first time right right so this this is now in line with the river it's allow natural flow that's it but keep the questions easier probably to do while we go through so here proposed s plan you can see the regulatory lines or near have water is red the light blue is the flood way and the dark blue is flood plane you can see the rip wrap showing here on the embankments it's you know covers the the new embankment to stabilize the new embankment since it is we are widening out there's going to
be new Banks there it's you know we need to protect that bank from failing it in a flood so it it is FEMA that determines the 100e flood yeah so they ones that responsible for changing it it needs to be changed the the female lines here are based on the current FEMA firm so that's what we're showing is the flood way and flood plan lines their elevations based off of the FEMA firm map yeah FEMA yeah is well I think the town is actually responsible for each town is responsible for updating FEMA burms so it's a yeah it's a it's a kind big topic dive into it but the it is you know administered and overseen by the town so if there was a a map revision for you know if this project raised you know if there was a project that raised the elevation of the floodway you had to go get a a FL of map vision it would be
kept on record at at the town and so if somebody from basic you know wants to look that up online basically the town has to provide that publicly but here we do not have an increase it is something we definitely try to avoid with that you know the big hydraulic opening is you feel a slightly decrease in the right yeah so to facilitate the construction and demolition demolition of the existing structure and construction of the new structure there'll be two stages of water handling so we've got the two pipes on the right side you can see with the the Dash lines can see that that they're separated as three the two arrows are actually going through the northern pipes so water handling will be put in place to confine the western side to allow removal of that Western pipe as well as the substructure so first the before water handlings ever put in place they'll remove the the top of the structure the the deck and we'll do that with a debris Shield so nothing falls into the river although that's not really it's a little different here with with the covers but they will so remove probably some of the roadway but
here they'll put in the contractor will put in water handling and remove the West Pipe and remove the the substructure and that'll all be done behind confinement and then dry settling basins will be in place to not allow a sediment to run into the river there'll be sediment en Rion control you can see is the the lines on you know the South Side the line with the block going through it and temporary watering Bas in the upper left there so yeah that's the first stage second stage you flip it so the newly constructed abutment that will have gone in in the first stage so first is removed and then also construct the the new abutment and so now you have a wider opening to the west side is the the abutment on the this is the South Side the left side is further back for the the new abutment and then we'll install new flip the water handling so that the rest of the structures in the drying can be removed as well as removing the the substructure and same thing install abutments there actually piles that be driven into Bedrock which is is for scour as well and the new stream bed will be formed and the rip wrap will be placed to protect the
mbankments question I'm curious about and practices and you mentioned files I imagine [Music] Beed a lot of that up with the contractor and you know methods and how they're going to do it so once the contract is selected they will come up with the plan and that'll have to be acceptable to the engineer but the dewatering is you know there's settling Basin place put place with the the water handling will be put in place will be sandbags or copper Dam or be copper D be sandbags or sheeting this case it's looking like you get we can get away with sandbags but that's going to be up to the the
contractor and so that area is dewatered through a sediment Basin and it'll need to be kept as a dry area in that confinement you know will be in place the the duration of the insulation of the piles and the information discharge what you mean they're like the river they're discharging the so if they need to dewater to dry out the area where they're working yeah right so they [Music] would pum it out Bas right yeah I'm picturing they would discharge that directly to the river then but I don't know I haven't read through the documents yet that's recommended I was just curious yeah so for yeah the the water course area would go directly to the water course
and outside basically above ordinary H water would be dewatered through Bas that Mak sense y so when that's when that is put up the after they take the old structur out and they're constructing the new structure is that above the water level when they're reconstruction that yep so typically the the water heing is designed for the 2year storm so it'll be high enough so that the river can flow through in that temporary condition up to a two-year storm and typically this is done during the summer so it should be during low flow periods so we try to get in and out as quickly as possible while it's you know low flow and avoid you know fish spawning things [Music] all right so here's a results of the impacts so we got just under 5,000 square fet of water for impacts there are no Wetland impacts there are no Wetlands on site there's
1300 square feet of temporary which is basically due to the the temporary water handling and you see that in the light pink there where that's separated two stages but it's in you know we're showing all of the impacts at once so that'll be happen in two different stages but that is that's all the impacts and the permanent impacts are for you know the necessary removal of the culverts and the installation of the substructure you know and rip wrap stabilization below ordinary water flood plane impacts the the whole site is just about within the flood PL except to the South there's there's there's some disturbance that's not that's beyond the flood plane lines but you know this is basically Army Corps jurisdiction flood plane much more cut here because of removing the the pipes from the water force and widening out the bridge so a lot of cut going from there no impacts expected back expecting the the the the Water course to and hydraulics to run mus efficiently is it gonna since it doesn't have the puls in it is it going to change the speed of while the water not anymore is actually it's a slight rise U but the the Hydraulics are surprisingly similar in the 100-year design event and and the higher events because of the flood plane width so because the 100 years is so wide that basically wave of that all of that water that is several hundred fets to the to the north is not very affected by that 80 foot opening U so we went from
about 50 feet of opening with the three openings to an 80 foot opening in the proposed condition and that versus several hundred feet does not impact the Hydraulics substantially the the 10year currently overtops the the roadway to the north it's probably know the the low point and that doesn't happen in the existing I mean in the proposed condition so there's there's some reduction in the in the water surface and so with that reduction of water surface you get a slight rise on the velocity but it's like on the order of you know a 10th of a foot per second so it's really not going to be noticeable so view area Town regulated areas within 200 feet of ordinary high water line HP River all the activity on the site is within 200 feet so all the disturbance here is within the up review
area it's necessary to complete the Bridge Project there's a lot of time in review spent with do and The Regulators to minimize the impacts as much as possible impacts right away impacts with water course and and you know the the majority of this is in the existing footprint of the the existing Road and and Bridge erosion sediment control we've kind of talked about a little bit U it'll follow all of the the state best management practices storm storm quality manual Connecticut D guidelines for soil erosion sedimentation sedimentation control guidelines all be confined within sedimentation control devices the Sim sedimentation control will be tied into the toe slopes of the water handling so it is completely confined and the Disturbed areas at the end of the project will be all stabilized and restored so as part of this project over the last several years we've had a lot of coordination with especially deep in Army Corps but various Regulatory Agencies part of deep Fisheries coordination is no unconfined work will be allowed in the water during June 1st from June 1st to September 30th and that's protect fish spawning so it has to be 100% fine during that time at the end of the project the fishing and parking or the river access and fishing access on the Eastern or
Northeastern side of the crossing will be maintained so it'll be reopened it will actually be closed during construction for safety the and we're of course replacing the multiple opening Culver with the clear spane fish passage the state and federal species of concern being U plant and animal there's we've gotten there's actually quite a bit of animals and and plants as well but Eastern B Turtle wood turtle hog no steak smooth green snake have all been identified and met with a qualified herpetologist a reptile amphibian guy in Bruner several times on site and he has had to provide a mitigation plan that'll be in the contract documents and he'll be providing sweeps of all the animals priate construction during construction and I think all that's been provided in the documentation because of bats it's federal state bats no tree clearings allowed between April 15 and May 31st so that'll happen sometime before April 15th golden Club as a plant species that was identified by deep but was not found on site in initial visits and the other thing that we've done is met with State historic preservation tribal consultation to make sure that there's no resor or tribal areas affected as part of the project and that the termination been was completed in 20122 and we've gotten the so the approval to
move forward with with deep as well a couple questions yeah first I did go down there to to take a look and there's a lot of trees take f are those all going down probably not it's probably just the ones that are close by yeah there's some that would be needed for wetlands and and water course so that may be it that you know if it's within the product area then it'll be the the trees that are coming down I don't know if they've already marked that off but that may be marking out exclusionary F I haven't been down there there are a lot of trees I I just the way change is almost seems like you might have to cut I'm not sure yeah and with that golden Club nobody actually seen any there is there you know did that plant be plant can we plant something in there or is that like it's it's endangered so I'm not I'm not sure whatever you know it's like one of these things keep popping up if you get it introduce it yeah I mean instead of going back and forth if you end up going back and forth with the bot say Oh I thought I S and said no I didn't see any because that's the way this reading was it's like one person was saying oh I saw it's a place where they have been cited so it's it's identified think by an area on the national diversity database Maps so the the Deep map so
it's an area that based on conditions for the site right you know it has a possibility so then we send out a you know qualified Bist go out there and search the site and they they didn't find anything in there somebody was down there found one definitely want to that's what they chance it's the place that they would gr right yeah was it growing no be checking again before and don't this year when the time period when they were doing that surve was when all the rain so the water was like three or four ft higher than it should be or even more all almost all Sumer and so yeah maybe there's none there because they're all been washed away or you know they just couldn't make it this year yeah but that kind of come next year yeah not so I'm sure when those when wear those plants it's you know I think that they that the Bess goes out during the time that they should be there you know whatever conditions to be check and and U you
know they'll be protected or what I'm looking I was trying to think about is like instead of going back and for and saying somebody actually say I saw one in there and now you know I don't see it anymore that kind of thing why can't we just put some in after we're done yeah I don't know that's I don't know if we can can you do that can you cut some of that up and put it out there just say okay well you might have K of doing what we did right here we go mitigate yeah I mean instead of like the other battle that could ensue you know like you got to have a b out here every daying on yeah like well they I mean they' completed this point what's necessary for deep to be satisfied which is you know what on the process to get it all written up and you know surveyed and so at this point they're you know satisfied that they're not there and I think that they be an additional followup oh they want yeah all right so finally project permitting the because it's in a flood plane and a floodway there's required flood management certification through deep and do which has already been issued we received approval for the Army Corps General permit will be issued upon awarded contract which is pretty soon bit opening was just recently so the last permit that we need is from is is in the W permitting so I think that's that's the remaining thing project so the project is is due
to start in or in this in the fallowing season so in the spring of 25 Spring and 25 yeah I know you guys have a a lot of CR I see you can't go between a lot of months I can't remember that this one's not too bad really compared to some title stuff where you got a two- Monon window and the in the winter to get a project yeah so but yeah the B restrictions for tree cutting is is really new it's new this year new species have been identified that they're trying to protect from you know roosting issues so that actually part of this project we that just came
up recently I had to seen that before yeah yeah know yes been the last 6 months last yeah I that's cuz we had the big bat die off from yeah well there was something last year there was a there was something going through the B population oh yeah yeah yeah and the white white a lot of BS to yeah so you're looking at starting in Spring of next year yep and then completing at the end of the sew in fall in the fall 25 okay yeah so one yes one construction season is spring and fall cool with most of the inwater work should be during something mons it's plan cool yeah when are they going shut the Bas break down when are they going to shut it down CL that road you know do they have so they'll shut it down before they start doing the basically the the water handle can do some work yeah be yeah temporary utility relocation and staging and everything right y [Music] champagne they just had a bid opening this week so contractors Bid And The Selection so award doesn't come for another couple months so they've got bids and they have to make termination the contractors and they'll be a third party inspector that is really hired by the town so responsible to the town to inspect the the contract may have been already done but that's there could still [Music] here but yeah any other questions any question thanks for listening to me ramble so how does it work you guys is do approval happen next weeks you've got to [Music] deliberate lot time for
public comment right heing and then yeah it's like 14 days so still next the next meeting okay de second is our next meeting okay so that's when you I just couple things had the pending permit last I issued it on oober 31st U was for this 365 l Road where they replace the existing gravel driveway with PA driveway the same size and then there was another one that I just got today which was the same company 69 Burn Road where they're doing a PVE driveway over gra and there a woss that so get a permit for that have any questions on those what happened with this one on Le Road I mean did they do it first not yet no they didn't do it no they actually didn't put in for anything but we our Public Works guy he gets the call before notification know going on there Chas per yeah so we that and then there wasn't
really a ton of alternatives for this one because it was weird because the driveway sloped down and then the storm drain like right at the bottom of it which goes into goes across the road into Lake but you couldn't really grade it like if gr into the neighbor jar onto their D kind kind that's not very yeah and then there was talk with zoning of whether or not nutrient allocation worksheet I don't know if you're familiar with that the planning zone commission adopted a few years ago so anything in Lake Area different zones you had to mitigate any so if you had a per service like that but right now it doesn't seem like they were discussing whether or not that Z if they had the authority toire oh and then they would have
dryw to collect the water so who's trying to figure out if they have that Authority Jim house loing agent and then Jed he was talking about it because he's chair of commission and then we have a new new zoning agent training so they they oh they didn't they weren't the ones that put the the new things into place they were yeah so who's actually questioning that them they're questioning themselves they're confusing they're confusing regulations I actually have a copy on it I don't know look at them it's it's interesting because it applies it like overs oh charger so it's like I have to require the wait for them to finish that because they require all this mitigation change as well oh I so I kind of work with figure out what works best it's kind of weird because need a weird worksheet and it's like a dry is this this many they do with like phosphorus renewable but each thing like a UL bed is this much of grass is as much this much there's no real specifics you know that's what I was it's like put a Dy build dri you know need a container build side none of that so you can put a dry that s useless
right so yeah that something we could refer docents we here the beginning ref [Music] has yeah if it was constructed in importance with their manag practice right get because it's your requirement we had one where they require electrician to do it because we had enough Renovations inside the house to trigger that so it's like why how you you gotri trying to construct like a drainage system it's out there sh there rard it's kind weird yeah yeah it is well it might help yeah might help well just keeping free flow like you said right at the end of the dve it's not going to be graving it's just going to move right through that drain the lake yeah and it's it's an old gravel driveway and mean I think there as perious anymore anymore oh it's yeah just it's almost the same it's almost the same yeah it's a flat pretty flat yeah it's not real yeah and then I was I was the other one was the over the church truck remove the F the Big File did they put any don't signed up for one anywhere I didn't see any but I I Pi a few pictures get back see if they had any more PL now
these are down see everything vegetation all go well yeah I don't did they did they do it yet I hear they didn't they must have done before yeah because they draw yeah yeah so they must have just I didn't see J I didn't see him out the water I saw there a weeko yeah written into the permit per tonight came never heard anything about well at least they didn't put the yeah I think it affected me I went for S and my eyes I was M for like a week [Music] really I'm not saying it was that but I don't I kind of yeah I'm maybe that something else could have been [Music] thato that's let's see our next regular meeting is Monday December 2nd 7 o' I have a motion to adone meeting at 751 I'll second all in yeah put everything out yeah you don't have through all that oh yeah well that I'm really glad find some of that stuff especially sare all that I didn't all so I [Music] do that 100 Year BL you know that's something thing 100 yeah is different for us we like there confusion a lot of times with us it's like flood planes are regulated Wetland but it's if there enough deposition so it has to flood you know enough to so