It's not on the network yet, but the new CORS in Chatham is apparently up. Too bad it came with a little drainage problem for the neighbor. Fortunately, we just sent out a proposal to the Engineer for the Town for a major survey of the area for drainage analysis and re-design.
I cut my teeth with GPS using the CORS network on occasion as the nearest station was ~60 miles away and all the stations were Southwest to Northwest. It made of an imbalance in the geometry and the solutions were hit or miss. Now I have one to the north ~25 miles and one to the west ~30 miles. Once this one is up, I will have one to the east within a mile of my office. We just need one activated on Nantucket and the geometry will be as complete as possible... unless they were daring enough to put one on George's Bank. There's a slim chance I will be in the Rapid Static Polygon...
I don't know the details of this site, but it seems like they should not be filling in a swale to build a CORS on top of it, sounds unstable. But, maybe it is anchored in rock below the swale
John Hamilton, post: 452463, member: 640 wrote: I don't know the details of this site, but it seems like they should not be filling in a swale to build a CORS on top of it, sounds unstable. But, maybe it is anchored in rock below the swale
Haha. It is better than 500 feet to bedrock... I provided the DOT with the original survey for the DPW construction several years ago. This is in vicinity of the old stump dump which was excavated and filled with sand. We have lots of sand here...
We often run helical piles for structure. You usually come across a moraine layer or shell layer within 100 feet and those will usually provide a decent footing. The shell deposits are equivalent to concrete.
On the elbow of the cape, we see a subsidence rate about three times the plate subsidence rate: 8 to 12 inches a century. It will be interesting to see the velocity of this station once enough data is logged.
I designed Rob and Trish's septic. Might have to see what sort of puddle they have after this storm. They are pretty low and needed a mounded system, so structural infiltration is not an immediate option. I know the town is looking at the whole area as another neighbor had a flooded basement after the 5.5 inch storm a few weeks ago. All sand... still have drainage issues...
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