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Drainage repair work

2016 earthquake may have lifted septic tank slightly and the level of the elbow just prior to septic tank is now slightly below inlet level (see pictures). As a result, the elbow area does occasionally get blocked up. Therefore, elbow level needs to be lifted. Most of the required excavation is done, though might require a little more. It seems that the existing PVC pipe can still be used, however, a new mushroom vent needs to be installed on the septic tank.