solutiontoyour emission=contrd -P is also the most economical. Celesco hasthe answers. Celesco understands how vitally important it is for you to achieve the most economical solution to your emission control problem. It has been our experience that the most economical solution is the one that solves your problem on a long-term basis and achieves unquestioned legal compliance as quickly as possible. Celesco is uniquely qualified to provide you with that solution. We are one of the few / i comDanies t o success'fully apply advanced technology to emission control. We have a proven track record. We offer advanced survey techniques, plant systems approach, and full service capability -including emission surveys, diagnostic analysis, emission control planning and engineering, supervision of eauiDment installation and start-up, operation monitoring and agency liaison. .ouRIo. lxIA Celesco is prepared to solve mvun your problem.Thoroughly.Inthe most economical way possible. If you have questions, call us. We have the answers. And write for the Celesco Environmental Services Brochure. Celesco Industries Inc. 3333 Harbor Blvd. Costa Mesa, CA 92626 I
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Environmental Science & Technology
It seems to me that when due consideration is taken of some more of the factors involved in the costs of processable iron, that recovered from scrap, may well, in many cases, be somewhat less than that of iron recovered from raw ore, freight rates not withstanding-although it would appear that lowering freight rates on scrap could well be an effective means used to provide additional incentive for the increased use of scrap, particularly in view of the effect of the depletion allowance which I have not included. The inclusion of, this allowance would make the iron from raw ore a bit cheaper at the mill door, in all probability, depending on scrap price variations. Nor can there be much question but that the freight rate structure is discriminatory by the ICC's own definition of the word. However, one does wonder if, perhaps, the apparent failure to consider all the actual costs of usable "iron units" at the mill door might not be another of the contributing factors to the fact that the Japanese seem to be able to buy scrap in the United States, pay going freight rates, ship it to Japan, process it, ship back finished products, and still make money on the product. Maybe they have discovered an "iron mine" in our own backyard that we did not realize existed and is not due entirely to labor cost differentials. C. A. Caswell, President Environmental Audit Corp. Pittsburgh, Pa. 15232
Sewer line infiltration Dear Sir: I thought the article ( E S & T . July 1973, p 586) was excellent. However, I would like to point out that our company is also in this business and has been since the early 50's. We do no inspection but we do manufacture equipment for our own use. In 1952, we repaired an old and deteriorated sewer line for West Palm Beach, Fla. During the mid-50's, the Centriline Division of Raymond Int. started the development of a television camera and, independently of the other companies in the field, developed a packer system as well as television inspection systems. After doing several jobs, however, we found we were "before our time." The rash of people entering the business with off-the-shelf television cameras and inadequately experienced personnel supported our decision to soft-pedal this end of our business. We do, however, continue to do quite a few sewer rehabilitation jobs. These are not the run-of-themill type jobs discussed in your article, however, and would probably not qualify for inclusion unless there were a section on Specialist of the Specialties. Charles M. Aiken
Raymond International Inc. Houston, Tex. 77027
