| From: | Lenny Siegel <lsiegel@cpeo.org> |
| Date: | 31 Jul 2002 18:29:36 -0000 |
| Reply: | cpeo-military |
| Subject: | [CPEO-MEF] Perchlorate |
From: Charles Douglas <caseyjones9@hotmail.com> Lenny, I have been following the discussion line on this bulletin board regarding perchlorate with great interest. I am particularly interested in the recent posting about perchlorate samples in Massachusetts that stated "[t]he method detection limit for remedial investigation is approximately 0.40 ppb." I am only aware of one EPA approved method for perchlorate, method 314.0, and it has a method detection limit MDL of 4 ppb, a full order of magnitude higher. What method is being used to detect down to .40 ppb in Massachusetts? If it is a good method, why hasn't EPA published it as an approved method for national use, and if its not a good method, why is EPA permitting Massachusetts to use it and keep citing it in the press? Jeff Charles G. Douglas Arlington, VA ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
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