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| The State of Minnesota has granted region wide approval for the use of LDO for reporting purposes. To use, contact your NPDES permit regulator. » Hach Method 10360 » Minnesota State LDO Approval Letter » EPA Hach method Approval Letter » ASTM Standard D888-05 Approval Letter » EPA/ASTM Validation Study |
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| Roger Fisher | (651) 296-7387 |
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