Clark Nexsen Presentation Fall 2013 -
Alright, thank you all for being here, all the mentors for being here. I am Bobby, I’m Alex Sarant, I’m Theresa and our mentors are Caleb Hurst and Dave Parker over there if you guys could wave your hands. Thank you very much. Alright, so I just want to talk about a little bit of site overview right now. So we’re located in Chesapeake Virginia and the site soils are pretty poor. Also the site slopes are less than 2 percent on most of the site. The address is located right off of George Washington Highway and the site acreage is about seventeen acres. There were no wetlands on site and we’re not a hundred year flood zone so we didn’t really have to worry about anything along those lines. Also no trees or brush on site to clear. Okay so, site sketch-up. This is what the site could possibly look like. As you can see there’s a lot of amenities on site. There’s an access road from George Washington Highway into a looping parking structure on site. As you can see there’s gym, community center, pool, community playground, garden, basketball courts, tennis courts, skatepark and even an ATV course on site. So there’s a lot of feature. Also around site there’s a walking trail and this is about half mile on site and then it goes into another half mile trail on the south of the site that’s already developed. So here’s the center of the site, there’s also a pavilion which can be used for many activities such as bands coming in and maybe just a good place to hang out. So onto the east of the site as you can see there’s the skatepark, basketball courts and tennis courts and I’d like to point out the sanitary sewer pump station which we have put in because of how flat the site was. The reason why we chose this location was to minimize, minimize the appearance, you know, I guess really not show the location to the users of the site. Also to the north there’s an access from the walking trail to the northern, northern community. And then on the west of the site as you can see the community gardens, playground, really just fun for the whole family. So also we want to talk some of the requirements from the city of Chesapeake. They wanted sustainable storm water design where possible and also BMP ponds should take up twelve percent of the area. As mentioned before there is great walkability and circulation on site and it’s a nice site design.
Okay, well the site is zoned A1 for agriculture and conservation. There are some regulations that go with that. There are parking regulations as well as number of parking spaces for both the number of indoor and outdoor facilities as well as ADA regulations. There’s also minimum lot frontage of one hundred twenty feet a minimum width of one hundred fifty feet a minimum area of an acre. And the site covered all of those criteria. We also placed thirty foot setbacks for each building and less than thirty five percent of the site is covered by structures. So there are some water and sewer connections to the east side of the site. So the sixteen point eight acres of land, five point five of those acres are green area and eleven point three acres are developed in some way, whether it’s the roadway, facilities, or the storm water ponds. The design speed of the parking area is ten miles per hour based on traffic analysis. There are also stop signs placed at each of the intersections and all of the ADA regulations were met as far as number of parking spaces as well as the slope of the parking spaces less than two percent.
Alright, thank you Theresa. Moving on to the grading plan. This was definitely the most challenging part of this development as it was a very flat site. So we had a lot of iterations and we ended up at this final grading plan. Essentially our goal with this was to minimize the amount of cut because we knew that if we didn’t do it right we could’ve gone overboard with the amount of cut we would have had just to drain the site. So we have the site broken up into four quadrants. You can see for the square part of the site right here, we four of these blue circles here are low points. These aren’t just the only inlets but these are the main inlets. The red lines depict high lines across the site so you can think of water flowing perpendicular to all of those lines. In this way we were able to segment it up where we didn’t have to have water flowing across the entire site to be picked up by inlets. And as you can see we were successful in reducing our net difference to about twenty seven hundred cubic yards of cut and all of that cut will be used in the ATV course which will be graded by an ATV specialist, I would assume. Alright, moving on to storm water management as far as the inlets go we had normal curb inlets, drop inlets, and filtera inlets which were used to fulfill some of the sustainable storm water policies that the city of Chesapeake wanted. On the right here you can see just a general layout for these inlets in order to make sure all the water gets treated before it goes into the storm system. Additionally, as mentioned before, we’ve got three ponds, smaller. They’re more aesthetically pleasing that way, we wanted to break up our storm water management facilities on site. Additionally we have graph swails in the center of the site where filtera units were not an option in order to maintain some level of treatment of storm water as well as ground water infiltration. As far as the calculation goes technically we used the rational method to determine our runoff values hydrograph overlays of our pre and post development hydrographs to determine the minimum volumes for all of the, for all of the ponds. As far as utility crossings goes it could have been kind of a mess. We were able to minimize our crossings to one sanitary sewer and water line crossing and one water line and storm water crossing. You can see the crossing locations here, the storm water pipe goes right about up and down through here. And were able to maintain all of the depth the amount of leeway between, yea the cover between the pipes, thank you Alex. Alright, moving on sanitary sewer.
Alright moving on. Our sanitary sewer pipes were sized at eight inches and made of PVC. The pipe layout is pretty linear to minimize cost. There was one section that required for force main that’s because of site slopes and to meet the minimum velocity of two feet per second we applies a point three nine percent slope on all pipes. The peak flow was determined to be one hundred eighty five gallons per minute and this was determined base on fixture counts of the community center, gym, and swimming pool. The peak use should be approximately two hundred people. So moving on to water, water lines and fire protection. Most of the system was comprised of ten inch cast iron pipe, with the exception of the six inch cast iron pipe for fire hydrants. Again the services the pool, community center, and gym. So the total fire flow demand was determined to be thirteen hundred gallons per minute. And the city of Chesapeake requires one thousand gallons per minute so were far beyond that requirement.
Okay, well for the phase one of the erosion sediment control we, it deals mainly with earth work. So we have two stock piles on site. This is the organic stock pile and inorganic stock piles here to the north of the site. We place the organic stock pile to the west because a lot of that organic soils going to be used for the playground and the community garden which are to the west of the site. And the inorganic soil, the extra soil will be used for the ATV course so that soil is placed there to not have to move it quite as much. The runoff of the site goes from the northwest to southeast so we placed these diversion ditches here to pull the water towards the sediment track which we have here and the sediment basin which is right down here. The second phase of erosion sediment control deals a lot with the storm water. So here is our storm water pipe network. At each of these inlets we places inlet protection and we also have some temporary and permanent seeding which are sustainable measures which the city of Chesapeake wanted. So we have some we have some temporary seeding here to the north and to the east. And to the south there’s permanent seeding. The total cost of the project is three point five million dollars. That consists of demolition, pavement, storm water, sanitary sewer, water supply, traffic costs, earth work, erosion sediment control, recreational facilities. Recreational facilities consisted of the skatepark, the tennis courts, the basketball courts and the playground. The swimming pool and the two buildings are separate from the project so they are not priced in the estimate.
Thank you very much. Any questions?
Do we have any questions? We covered absolutely everything?
What was the initial scope of the project?
The initial scope of the project so as far as what the city of Chesapeake actually wanted?
What were your requirements?
Our requirements were to provide the gym, community center, swimming pool, tennis courts, basketball courts, and the skatepark. We added in the ATV course, that was kind of a conditional thing. The community garden we thought of that as we were going along and realized we were going to have a lot of excess organic soil. The playground was also required.
The only things that weren’t required were the community garden and pavilion. The ATV course, right, that was a contingency.
Based upon the space we had so we tried to make best use of those as we could as we were going through.
We do have one more slide. Dave could you stand up please? So last night we went out to dinner and we had great conversation and we met these guys families, their wives, and we were talking about cars a little bit. Dave was telling me about how we had the opportunity recently to drive a Lamborghini around a track down at Disney World which is one of my dream cars. So he’s talking about how he’s taking this around a corners, it’s got some S-turns in the middle of the track and I’m thinking this guy must still be in his mid-twenties. It’s actually his birthday today so can we please all give a round of applause to Dave, happy 29th birthday! Thank you very much.