If you have historical data about your site and you have never had a result above your permit level, then something may have occurred during sampling or at the lab. This leaves you with two choices: either you re-sample, or you have the lab re-run the sample you submitted. Re-running the sample submitted to the lab may account for errors at the lab but not those that may have happened during sampling. Re-analyzing samples already submitted is not foolproof, sometimes errors can not be recreated or determined. If you do not have historical data and you believe that the results don’t make sense, by all means request a re-analysis or re-sample (after all that is why we are here, we want you to have accurate, legally defensible data in order for you to make the correct decisions for you project).
IF your historical average is near your action level, a result just above the action level may fall within acceptable statistical variation. This means if you tested the sample multiple times, some results would be above your action level and some would be below. SVL has procedures in place for how we re-analyze your samples and how a re-analysis shows up on your report. If there is justification for a re-analysis you will receive a report with only the new results; if not, then you will receive a report with both sets of results. We do this so that we can show that we are not in collusion with our clients and are doing what is known as result shopping, this is where a lab keeps running a sample until the client has the result they require.
In all cases the best policy is to re-sample, but we understand this is not always possible.