Week 42, Part 1- Containment Pad & Electrical

Last week we poured the slab for the Secondary Containment Pad. We call it the "Chem Pad" for short since the Chemical Storage tanks will sit on this concrete pad with a short containment wall. Liquid ferric sulfate is needed for phosphorous removal in our system. It will be stored in two large tanks. On the same pad, inside the wall, our chemical feed pump & controller will sit in a hot box. But we'll be looking at that in a couple weeks.

Here is the fresh slab and the forms for the short containment wall being built-





Most of the early blog entries were about big segments of work- building the Treatment and Phosphorous Removal structures, the Operations building and finally the Mechanical building. Now, we're mainly down to details. But I will try to guide the blog through the details at a steady pace while still trying to find interesting pictures or observations on the work at hand.

We're going to see a lot of the Challenger Electric crew, or their work, in the final two months of the job. Here is a view I've shown before- one of the main duct banks going from the MCC in Mechanical up to the Operations building. This carries power, control and signal to the systems installed up there-



This week Challenger began setting all the sonotubes for light bases around the main site. Here Todd has placed the sonotube over the conduit stub-ups and is making sure it will sit straight after the concrete is poured in-



Another soon-to-be light base near the Chem tanks. Oh, wait- we didn't see how the Chem tanks got there!-



So, here's the first Chemical Storage Tank being hoisted into place-



You can see there is room for two on the pad-



And at the left edge of this wide view of the Phosphorous Removal structure & roof, you can see the 2nd chemical tank being lifted into place-



More details in the next entry...