DISCLAIMER:
The opinions stated herein are based upon visual observations "ONLY" and are not substantiated with the results of forensic investigation practices. Those efforts may be able to further determine a factual assessment for the potential causes of the pool lifting.
OPINION:
Therefore our opinions are based solely upon familiarity with the local conditions "ONLY" having constructed pools in the Granite Bay area for decades but, we refrain from making any claims as to and absolute determination and shall bear no liability and or responsibilities in the determinations of any and all claims of adjudication.
CONDITIONS:
The property is located adjacent to an existing creek that basically parallels the northern property line.
During periods of peak storm precipitation, prolonged rainfall would cause the creek's surface elevation to rise and widen, as was stated according to the Homeowner. These conditions can influence the static ground water elevation, which could have caused it to also rise, as well. When this occurs the creek banks can become saturated and depending upon the soil type (texture) water can then migrate into adjacent areas. With the winter of 2017 being a wetter than normal year and the Granite Bay area's subsoil notoriety of being "Decomposed Granite" it is highly likely that the "OWNER" witnessed flooding conditions may have resulted in water permeating under the pool, which could have likely been a factor in seasonally influencing the water conditions under the pool during the April 2017.
RESULTS:
When such conditions prevail then the pressure under the pool is equalized while the pool is full of water but, when a pool is drained during such conditions then the pressure being exerted against the pool's outer shell becomes greater than the weight of the water in the pool (+/- 62-Lbs. / CU.FT.) and the shell becomes like a ship's hull and can begin to float. It will rise out of the ground like a vessel (if drained) when the ground water level becomes influenced by the proximity to a nearby creek's flooding conditions.
REMEDY:
We see two (2) possibilities for remedy. #1.) The pool can be demolished and rebuilt (+/-$60K to $70K) or if the Homeowner is will to mitigate costs and accept an "AS IS" approach, then some performers may be willing to attempt #2.) Grout Jacking . This would run about the same as the Demo portion but could save the shell, thus saving about +/-$10K.
RISK:
If the pool shell develops additional cracking during the Grout Jacking, then of course that would be a cost over run, as the (e) pool's structural integrity cannot be determined. Grout Jacking process involves drilling holes through the bottom of the pool and then pumping a specially designed grout under pressure in order to re-level the pool.
*END OF SECTION*
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