indicators of seawater intrusion - Seasidebasinwatermaster.org

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FINAL DRAFTACTION 2: DECLARATION OF SEAWATER INTRUSIONIf the verification confirms that seawater intrusion has occurred within theSeaside Groundwater Basin, the Watermaster shall issue a Declaration ofSeawater Intrusion within 15 calendar days of verification.ACTION 3: NOTIFICATIONWithin 10 calendar days following the Watermaster’s Declaration of SeawaterIntrusion, all groundwater producers in the Seaside Groundwater Basin,MPWMD, and all other interested entities within the Seaside Groundwater Basinshall be formally notified. The Watermaster shall notify all parties that the SIRPcontingency actions have been triggered, and will identify the well(s) thattriggered the SIRP contingency actions.ACTION 4: PUMPING REDISTRIBUTION PLANThe pumping redistribution plan is designed to contain observed seawaterintrusion, and to protect production wells until a supplemental water supply isobtained. The pumping redistribution plan consists of the following eightactivities that will be implemented. Many of these activities should be appliediteratively.• Discontinue or substantially reduce pumping the Impacted Well(s). Ifseawater intrusion has been declared for a production well, pumping atthis well shall be discontinued or substantially reduced as soon aspossible, but no longer than 30 calendar days after the Declaration ofSeawater Intrusion. If seawater intrusion has been declared for onlymonitoring wells, this activity is unnecessary.All of the following activities shall be initiated within 90 calendar days after theDeclaration of Seawater Intrusion:• Identify At Risk Well(s) where seawater intrusion might occur. At RiskWells are production wells that have the potential to become impacted byseawater intrusion based on their proximity to the Impacted Well(s), localgroundwater gradients, and other conditions.Seawater Intrusion Response PlanNovember 19, 2008 - 16 -
FINAL DRAFT• Identify and/or install additional monitoring wells. The Watermasterwill evaluate the benefit of installing additional groundwater monitoringwells to evaluate the movement of seawater intrusion towards the At RiskWell(s). If this evaluation concludes that monitoring wells should beinstalled, the Watermaster will pursue installation of these wells with duediligence.• Estimate the groundwater conditions that protect production wells. TheWatermaster shall estimate the maximum acceptable groundwatergradient between the Impacted Well(s) and the At Risk Well(s) thatprevents seawater intrusion from reaching the At Risk Wells before asupplemental supply is obtained, currently estimated to be 2015. TheWatermaster should further estimate the expected total dissolved solids(TDS) and chloride concentrations over time that might be observed atexisting or new monitoring wells under this maximum groundwatergradient.• Identify and evaluate production wells’ influence on observed seawaterintrusion. All production wells in the Seaside Groundwater Basin shall beevaluated and ranked for their influence on the groundwater gradientsthat are causing seawater intrusion and migration. The Watermaster shallestimate one or more recommended pumping scenarios that will achievethe maximum acceptable gradient between Impacted and At Risk well(s).• Increase monitoring frequency. The Watermaster should increase themonitoring frequency of the Impacted Well(s), monitoring wells, and AtRisk Well(s) to evaluate the progress of the seawater intrusion.Groundwater elevations at these wells should be measured monthly, andgroundwater samples should be collected from these wells and analyzedmonthly for major cations and anions. The groundwater gradient shouldbe analyzed every month to confirm that the pumping reduction is havingthe planned effect.• Re‐evaluate the Operating Yield. In accordance with the AmendedDecision, the Watermaster should re‐evaluate the Operating Yield toprevent further Material Injury.Seawater Intrusion Response PlanNovember 19, 2008 - 17 -
Page 3 and 4: FINAL DRAFTTABLE OF CONTENTSSECTION
Page 5 and 6: FINAL DRAFTSECTION 1BACKGROUND AND
Page 7 and 8: FINAL DRAFTSECTION 2CONSISTENCY WIT
Page 9 and 10: FINAL DRAFTThere is no requirement
Page 11 and 12: FINAL DRAFT3.1 INDICATORS OF SEAWAT
Page 13 and 14: FINAL DRAFTCHLORIDE CONCENTRATION T
Page 15 and 16: FINAL DRAFTTable 2: Sodium/Chloride
Page 17 and 18: FINAL DRAFTOTHER FACTORSGroundwater
Page 19: FINAL DRAFTSECTION 4SEAWATER INTRUS
Page 23 and 24: FINAL DRAFTSECTION 5REFERENCESBachm
Page 25 and 26: FINAL DRAFTAPPENDIX A:OVERVIEW OF S
Page 27 and 28: FINAL DRAFTaquitards, which transmi
Page 29 and 30: FINAL DRAFTCross-hatchingshows seaw
Page 31 and 32: FINAL DRAFTplot along a straight li
Page 33 and 34: FINAL DRAFTFigure 5: Piper Diagram
Page 35 and 36: FINAL DRAFTINCREASING CHLORIDE CONC
Page 37 and 38: FINAL DRAFT2500220001.6Chloride (mg
Page 39 and 40: FINAL DRAFTOTHER INDICATORSHem (198
Page 41 and 42: FINAL DRAFTAPPENDIX B:HISTORICAL CH
Page 43 and 44: FINAL DRAFT450400Chloride Concentra
Page 51 and 52: FINAL DRAFT250Chloride Concentratio
Page 53 and 54: FINAL DRAFT250Chloride Concentratio
Page 55 and 56: FINAL DRAFTAPPENDIX C:STATISTICAL T
Page 57 and 58: FINAL DRAFTWhere n equals the numbe
Page 59 and 60: FINAL DRAFT[ Cl−]average56 + 54 +
Page 61 and 62: FINAL DRAFT4) Because ‐13 is less
Page 63 and 64: FINAL DRAFTTable C‐4: Pearson’s
Page 65 and 66: FINAL DRAFT90085Chloride Concentrat
Page 67 and 68: FINAL DRAFT908.585Chloride Concentr
Page 69 and 70: FINAL DRAFT8007570Chloride Concentr
Page 71 and 72:
FINAL DRAFTAPPENDIX D:HISTORICAL SO
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FINAL DRAFT1.61.41.210.80.60.40.20S
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FINAL DRAFT1.61.41.210.80.60.40.20S
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FINAL DRAFT1.61.41.210.80.60.40.20S
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FINAL DRAFT1.61.41.210.80.60.40.20S
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FINAL DRAFT1.61.41.210.80.60.40.20S
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0Aug-04Aug-05Aug-06Aug-07Aug-08Aug-
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FINAL DRAFTAPPENDIX E:PIPER DIAGRAM
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FINAL DRAFTSulfate (SO4) + Chloride
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FINAL DRAFTAPPENDIX F:STIFF DIAGRAM
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FINAL DRAFTCations meq/l Anions30 2
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FINAL DRAFTSBWM-1Sample taken at1,1
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