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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, TIPIC.E 22, SEC JON 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 /> iA <br /> WATER SYSTEM G1­k C_A"P GZ L O1 <br /> Ifte Opiorator CDOICT ; -Ton cx,-WXc..r p Y-- <br /> Property <br /> Pra err Owner: <br /> Certified Laboratory <br /> Well ID <br /> well ID <br /> Pressure Tank 2. 8. <br /> ROUTINE 3. fl <br /> REP T 1 4 10, <br /> REPEAT 2 5 11. <br /> REPEAT 3 6 12. <br /> REPEAT 4 <br /> OTHER <br /> OTHER <br /> OTHER <br /> IWESATIGATION: <br /> Review the results above. If the#Qll is positive, then determine i#te well is contaminating 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 it 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 functioning/sealing properly. Water will not run out of the tap when the weH pump is off, if the check valve is functioning. <br /> If the valve leaks water back into the well, then the source of the contamination may originate dawn 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, chlofanation or sounding of the well performed,etc_) <br />