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0;9/26/2007 09:52 FAX 2094663046 CAL TANK R 002 „li ,,,r';„,i, m ei ENVIRONEERING, INC. Process Engineering, Water Reuse, and Accident Prevention September 11, 2007 Mr. Jack Bishop— California Tank Lines, Inc. 3105 S. El Dorado Street Stockton, CA 94206 Re- Inspection by San Joaquin County Environmental Health Department Dear Jack.- At ack: At your request, I have investigated preparing a tank and secondary containment certification for your El Dorado Terminal storage facility. The inspection report from Mr. Von Flue dated 6/26/07 noted a need for this certification. The tanks appear to meet the requirements for certification, but the secondary containment requires modification before it can be certified. My recommendations are as follows: 1. Sodium. hydroxide storage — 3000 gal. tank - repair the containment area (already completed), install seismic restraints on the tank, and use the entire containment area (9 ft. x 24 ft- 8 in. x 2.5 ft. high for caustic storage. This will meet the requirements for 3000 gals capacity plus storm water from a 50 year storm. 2. Wastewater storage — 10,500 gal rinse water + 7500 gal cone bottom tank- The existing containment area is too small. I suggest cutting a hole in the wall separating this area from the adjacent area containing a 5000 gal tank + a 7500 gal cone bottom tank. This will make a single containment area of 29 ft. 8 in. x 24 ft. 8 in x 2 ft. high- Part of this wall is 2 ft. high, and part is 2 ft. 8 in. high. It will be necessary to increase the 2 ft. section to 2 ft. 8 in, to meet the storage requirements. If this impractical for any reason, an alternative would be to remove the 10,500 gal tank and replace it with one no larger than 7000 gals. This would provide the required containment volume, including 50 yr storm. 3. While an argument can be made that the wastewater is simply rinse water from trailers containing very small concentrations of chemicals (mostly food products or acids or bases), and such is not hazardous and should not require seismic restraints, I believe that they should be provided for the wastewater tanks to meet the storage guidelines. This leaves only the cone bottom tanks. These tanks are mounted in structural supports purchased with the tanks- The structural supports on these two tanks do not meet seismic design criteria. However, in this case, since the cone bottom tanks are used to settle flour, I do not believe that the expense to replace the supports with seismic supports is justified, and will state this view in the certification, P. O. Box 2498, Danville, CA 94526 - (925) 838-1763 Fax (925) 838-9621