PRETREATMENT RATIONALE FOR MODIFICATION

Yokohama Tire Manufacturing Mississippi LLC
Clay County
West Point, MS
Chemical/Water I

MSP092351
SIC: 3011
February 27, 2018
Permit Engineer: Tracy Tomkins

A request to increase the zinc limit was received and approved by MDEQ and the City of West Point.  The changes are as follows:

Zinc Concentration from 0.799 mg/l to 1.5 mg/l monthly average 
     1.066 mg/l to 2.0 mg/l daily maximum

Zinc Loading from 0.60 lbs/day to 1.0 lbs/day monthly average
       1.20 lbs/day to 2.0 lbs/day daily maximum

The grab sampling requirement:  “Grab Sampling:  Grab sampling shall consist of four samples taken 15 minutes apart.  Each shall be analyzed and the results averaged for a final concentration.” has been deleted and just one grab sample per event is required.

Samples taken in compliance with the monitoring requirements specified in the permit shall be taken at the nearest accessible point after final treatment but prior to actual discharge into the POTW collection system.  Limitations set by the City are for the whole effluent.