Use of the Forest
Public use of Saginaw Forest is encouraged. Rules for the public's use include (but are not limited to):
- No parking in front of the access gate.
- Public use hours are from 6am to 6pm only; no camping on the site!
- No vehicles or bicycles are permitted on the site except those for approved research and teaching use (bike parking available at the main gate).
- Dogs with owners are welcome to visit, but they must be on a leash. (Also see here.)
- Dog owners must carry out all pet waste; please bring your own doggie bag to do so.
- No cutting or collecting of plant material; no hunting or harming vertebrates (this includes no fishing).
- No smoking.
Thursday, August 26, 2010
Drills and bits
Although this drilling is going to go through sand and silt, it also has to be able to break up small rocks, and push aside slightly larger rocks. ... and it costs about $1000, so while it's very durable, it's also something that you don't want to be worry-free over.
This is one of the reasons why they decided to just pull up, pull out, and restart yesterday after hitting a large, immovable rock about 10 yards down.
And the drillers need to put in about 216' of drill sections. Each of these sections is 5'. There are 120' of drill section on this pallet, with another such pallet with sections being pulled upon.
Each drill section is 7" wide (4" tube, with 3" flange), meaning that for each 5' section, the drill removes roughly 1.3 cu.ft. of material, and after the 216', there will be a rough volume of 57.7 cu.ft. of material removed. And the removed material goes into this truck.
At every 10' of drilling, a water sample is taken (when the new section isn't in silt) for later testing. If a water sample comes back with new evidence of 1,4 dioxane in it (i.e., the existing wells aren't monitoring at the depth where it was found), another well might be sunk to monitor that depth, however, it isn't expected that new contamination will be found. However, because time is taken to take soil samples at each 10' interval (in order to determine if a water sample can be taken) followed by a water sample (when needed), each 10' section will take longer to process as the well gets deeper, since the soil sampler needs to be lowered and removed, as well as the subsequent water sampler. Therefore, although the drilling has gotten roughly half way to the expected bedrock level over just one day, it's unlikely that they will finish by the end of the day on Friday. Monday is almost definite (unless they hit another large rock).
UPDATE: They DID hit another large rock at 170' depth.
UPDATE 2: A monitoring well has been installed.