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Entry Points & Common Aquifers
Transcript of Entry Points & Common Aquifers
Utah Division of Drinking Water
801-536-4467 History Entry Point Common
Aquifer 1993 Phase II/V Sampling Begins
January 1st, 1993 Inorganics & Metals
VOCs (Volatile Organics)
Sodium/Sulfate/TDS Old Grouping
Where we relied on the water system to tell us if their sources mixed before serving customers
DDW checked Inorganics & Metals data to determine if sources were in the same aquifer 2010 NEW DDW POLICY Why? To confirm all Phase II/V samples are representative of the water the consumers are drinking. Phase II/V Samples are: What does this mean for you? If more than one well was pulling water from the same aquifer then both wells were "grouped" for sampling compliance. DDW used to compare the Inorganics and Metals data to confirm the common aquifer status. New Policy Water systems that have sources in a common aquifer must apply for those sources to be grouped into a sampling staton. This application must include 8 items: 1. Detailed well logs
2. A cross section prepared from hte well logs which clearly indicates that the wells draw water from the sample aquifer
3. A review of the chemical data
4. A statement signed by the professional geologist or engineer that it is his/her opinion that all the wells are in a common aquifer
5. The professional shall stamp the report
6. A signed and dated statement from the water system that the sampling will not threaten public health
7. A sampling plan for the sources to be grouped that shows the samples will be rotated through each active source
8. Copies of data of background chem samples for each individual source The Administrative Services Section at DDW will review the common aquifer submittal and decide if the sources qualify for common aquifer status. When sources mix before entering the distribution system. It must be BEFORE serving any customers. Spring 1 Spring 2 Spring 3 Water systems will only sample at the entry points when all the sources combined at that point are in use. In order to ensure that this is taking place the water system must submit to DDW a sampling plan that shows the sources in the group source sampling station, their operational periods, and planned dates of sampling.
Systems must also submit copies of Phase II/V contaminant and contaminant group results for each source in the entry point grouping. This data must include the new source inorganics and metals, volatile organics, pesticides, radionuclides and nitrate taken directly at each source in the potential grouping. Sampling Plan Example: The Rules Section will review the entry point sampling plan and decide if the system qualifies for entry point sampling. Implementation All systems with grouped source sampling stations received notice of this policy in July of 2010. Systems are required to submit to DDW the application for common aquifer status or entry point sampling plan by the following deadlines: If a water system has not submitted their application to DDW by the above deadlines then the current source grouping will be removed. 1. Check your monitoring schedule to see if you have a Grouped Source Sampling Station. 2. If you have a Sampling Station determine if you can keep it based on Entry Point status. Yes No Sources are mostly always active, mix before serving any customers, can be sampled at mixing point Sources do NOT mix before entering distribution system, but they are wells that can be considered in a common aquifer 3. Apply for Entry Point status by the deadline 3. Apply for Common Aquifer status by the deadline OR Neither Entry Point or Common Aquifer apply. The Sampling Station will be removed and Phase II/V samples must be done at the individual sources. Inorganics & Metals
VOCs (Volatile Organics)