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SAN JOAQUIN COUNTY ENVIRONMENTAL HEALTH DEPARTMENT <br />SMALL PUBLIC WATER SYSTEM <br />POSITIVE TOTAL COLIFORM INVESTIGATION <br />AUTHORRY: CALIFORNIA Cow OF REGULA TIONS, Ti7tE 22, SECTION 6"26(B) <br />This form is intended to assist Small Public Water Systems with completion of a Positive Total Coliform (TC) Investigation for exceeding the <br />Total Coliform Rule (TCR) Maximum Contaminant Levels (MCL) <br />W ATTR SYSTI=hA C A"P Q IL� <br />Certified Operator (CDOICTOl7 ; I-Tnnc.,-Vhc. \ Cno 1L J <br />Well ID <br />Well ID <br />1. <br />7. <br />Pressure Tank <br />2. <br />8. <br />ROUTINE <br />3. <br />fl, <br />REP T 1 <br />4 <br />1 Q. <br />REPEAT 2 <br />5 <br />11. <br />REPEAT 3 <br />REPEAT 4 <br />HER <br />INVESATIGATION; <br />Review the results above. If the #Qll is positive, then determine i# the well is ccitaminating the system, or is thess�+ term contaminating the well. <br />To determine this inspect the wellhead for a functioning check valve. is it present ? _ 4 YIN. Is ii functioning to prevent system water from draining back into <br />the well? �Z YIN. To verify this, open the sample tap installed an the weal side of the check valve, when the well is off. ff water runs out of the tap, then the <br />check valve is not functiorringlsealing properly. Water will not run out of the tap when the weH pump is off, if the check valve is functionJng. <br />If the valve leaks water back into the well, there the source of the contamination may originate down stream of the welt. If the check valve is holding, then most <br />likely the wall is the source of the contamination. <br />)F THE WELL IS C;QKTAMIINATING THE SYSTEM: <br />Perform a physical inspection as Itemized in the SOURCE section. Determine if the contamination was caused by a structural deficiency at the surface of the well <br />head or the construction/deterioration of the well. <br />Interview the operator to determine if maintenance to the well or pump took place since the last absent TC results. (were well components replaced or repaired, <br />weirnead seal broken, chlorination or sounding of the well performed, etc_) <br />