AgdaPkt 2018-03-26 Joint SA PFA - Laserfiche WebLink

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Redwood City Water Quality Monitoring Program Plan © 2014 DKF Solutions Group, LLC Page 21 of 41  Source: Immediate vicinity where the SSO entered the surface water. This point will actually be downstream of the actual SSO entry point for SSO’s that have stopped entering the surface water to be sampled. If the SSO has stopped, calculate the approximate downstream distance from the original SSO location by dividing the time since the SSO occurred by the estimated velocity. This is the approximate downstream distance from the SSO discharge point to the “source” sampling location. o Due to possible tidal action in the surface water or other factors, another method may be used to determine the “source” location at the discretion of the Public Works Superintendent. o See Section 9.F for information on determining velocity of the surface water in order to determine the Source sample location.  “Downstream” of SSO: This sample will be collected far enough downstream to be representative of the water quality of the surface water after adequate mixing of the surface water and the SSO have occurred. Typically, this location will be 50-feet downstream of the Source sample, but this may vary on the size and velocity of the surface water to be sampled. o NOTE: The terms “upstream” and “downstream” may depend on the tidal cycle if the water body is tidally influenced. Check the tide chart(s) and table at the following link: http://tidesandcurrents.noaa.gov/noaatidepredictions/NOAATidesFacade.jsp?S tationid=9415623. 3. Sample labels shall be completed for each sample, using waterproof ink. The information recorded on the sample tag/label includes:  Date: a six digit number indicating the year, month, day of collection  Time: a four-digit number indicating military time of collection (e.g., 0954)  Sample Location: sampling location description as either Upstream, Source, or Downstream  Samplers: each sampler is identified  Parameter/preservative: the analysis to be conducted for the sample /sample preservation 4. Photos or video of each sample location will be taken, properly labeled with date, time, and view direction and a map of the photo locations completed. Photos and videos shall include relevant landmarks to identify sampling locations and their surroundings. Due to the evidentiary nature of samples collected during enforcement investigations, possession must be traceable from the time the samples are collected until they are analyzed. To maintain and document sample possession, chain of custody procedures (Attachment 3) are followed. A sample is under custody if:  It is in your possession, or  It is in your view, after being in your possession, or  It was in your possession and under your control to prevent tampering, or 6.2.A. - Page 187