COMPLIANCE INFO_FILE 2 - Laserfiche WebLink

Home Browse Search

Antonia K.J. Vorster December 29, 1989 Page 2 PROJECTED SCHEDULE FOR CLOSURE Better stated, Southwest Hide Company surface impoundments at their Manteca Plant cannot be closed until the industrial brine recycling system is installed and proven reliable. The brine recycling system is scheduled to be operational by July 1990. Fine tuning and heavy operation should provide answers to any reliability questions that might exist by September 1990. At that time some of the brine and salt from the surface pond storage will be recycled through the "brine recycling system" with organics being removed and processed. The concentrated brine will be recycled through the animal hide stabilization process. The salt will then be transported off site as part of the hide package sent to the tanneries. Excess water will be exhausted as evaporated water vapor. It is thought that crystallized salt in the ponds can be put back into solution so that these crystals can be recycled from a liquid. The existing solid material found within the ponds contains not only NaCL but also organic substances that are not compatible with the hide stabilization process, hence the organics must be removed from the salt crystal mass before the NaCL can be applied to the green hides. Once the salt crystal mass , currently in the ponds, is removed and the liquid remaining in the ponds is recycled, the interior of the ponds will dry out. At this time, power equipment can enter the ponds and perform work through the pond liners that will answer once and for all - have the ponds leached into the vadose zone under the ponds or into the ground water. Using small bore (4" - 6" ) augers to allow for inplace soil sampling, the liners will not be damaged excessively and the auger holes in the liners can be repaired by patch sealing. Until the above work is done it is not reasonable to prepare closure plans specifically for the existing site. The ponds may be useful in the remediation work or may be use in the storage of stormwater that falls into the drip or spill areas that would be confined and disposed of as needed.