Appendix 4: Vehicle Use List - Oklahoma

A light greenish blue-gray is observed at pH 5.1 (~30 mg/L alkalinity), a violet-gray at pH 4.8 (~150 mg/L alkalinity), and a light pink is observed at 4.5 (~500 mg/L alkalinity). Since the OCC is primarily concerned with gross alkalinity concentrations, digital titration is an accepted method. ................
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