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| NORTH CAROLINA | |
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| Region 4 of the U.S. EPA has granted region wide approval for the use of LDO for reporting purposes. To use, contact your NPDES permit regulator. » LDO® ASTM Region 4 Approval Letter » Hach Method 10360 » EPA Hach method Approval Letter » ASTM Standard D888-05 Approval Letter » EPA/ASTM Validation Study |
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| Tony Hatcher | (919) 733-3908 *207 |
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