Chlorinated: Na2S2O3 than HCL, pH<2
Unchlorinated: HCl; Cool, 4 C
Gas: 14 days
Diesel: **14 days/ 14 days
**First Hold Time is for sample extraction; second Hold Time is for sample extract.
A Chain of Custody(COC) form, listing all samples, date and time sampled, and analysis requested should be filled out by the Sampler. This COC form should accompany the samples to the testing laboratory.