OHA Drinking Water Services
Contact Report Details |
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| PWS ID: | OR41 05225 | ||
| PWS Name: | CLAY HILL LODGE | ||
| Who Was Contacted: | Martin Moore | ||
| Contact Phone: | 503-859-3772 | ||
| Contact Date: | 11/08/2019 | ||
| Contacted By: | PARRY, BETSY (DWP) | ||
| Contact Method/Location: | Phone | ||
| Assistance Type: | OTHER WATER QUALITY - New turbidimeter results do not match old meter | ||
| Reasons: | SWTR |
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| Details: | This lodge only has enough people to be a non-EPA PWS for a month or two per year, in the fall. So Martin only needs to submit SW treatment reports for the operating "season." This year, he only had enough people during the month of October. Martin bought a new digital turbidimeter this summer, and never got the results to match his old turbidimeter. The results of the new meter were off by a decimal place compared to his old one. (For example, the new meter showed 2.0 NTU and the old one read 0.2 NTU for the same sample.) Every day in October, the numerals from the two meters matched up except for the shift in the decimal point. He wondered which numbers to report in his October treatment report. He is no longer at the lodge for this year, so he didn't have the turbidimeter at hand when he phoned. He didn't remember the brand name. He said he calibrated the new one multiple times, but it sounds like he does not actually own primary standards for calibrating it - just one "blank" vial. I told him he could record the results from the old turbidimeter on his October treatment report, since he kept using it as well. But to get his money's worth from the new machine, he should call the manufacturer when he has the meter in hand because it might be a simple setting to adjust. Also, he should ask the manufacturer about calibration standards. I suggested that if he could find someone else who uses the same-sized vials in their turbidimeter (e.g., Hach standard size for a digital benchtop meter), he might share the cost of a set of calibration standards. He may not need to use the standards more than one or two days per year, but the standards expire yearly. |
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