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I am in the SF Bay Area in San Mateo county. In October temperature reach the 70s. The suggestions sound like I should empty the pool during construction and the plaster should be ok if I wet the surface down daily.

It hasn't rained for 5 months so the water table is likely quite low. The concrete deck needs to be removed for the excavation, so it has to be replaced anyway. What about damage to the plaster if the pool is empty for 2 weeks? Looking at the construction drawing above on where the retaining...

An update on my situation: I had contractors look at this and determined that the problem is soil erosion under the concrete deck and the backyard being downslope. The clay type expansive soil eroded down the slope over time from rain water/pool leak and created voids under the concrete, which...

Thanks for the response. This pool is probably 20 years or older so why did the cracks suddenly accelerate in severity and spreading rapidly across multiple concrete panels in the last month? I see some erosion of soil under the edge of the concrete deck but that was probably present for years...

I bought a house in Bay Area, CA 1 year ago with a pool. The concrete deck had small cracks that I didn't really pay attention to at first. In the past 2 months, the cracks have expanded significantly with smaller cracks appearing weekly. The worst area is in the close-up picture, where the...