indicators of seawater intrusion - Seasidebasinwatermaster.org

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FINAL DRAFTc. Change of Stiff diagram(s) shape from baseline conditions featuringprominent high chloride spike.d. Concentration maps indicate increasing chloride concentrationsnear the coast.Seawater Intrusion Response PlanNovember 19, 2008 - 14 -
FINAL DRAFTSECTION 4SEAWATER INTRUSION CONTINGENCY ACTIONSIt is not possible to halt and reverse seawater intrusion unless supplementalsupplies are available. Until these supplies are secured, the Watermaster shouldimplement containment strategies to reduce the magnitude and extent ofseawater intrusion, if it is observed. By containing seawater intrusion, theWatermaster will: (1) help preserve productive use of the Seaside GroundwaterBasin; and (2) facilitate the restoration of the Seaside Groundwater Basin waterquality by limiting the extent and spread of the intrusion. The purpose of thissection of the SIRP is to develop a containment strategy and actions that can beimplemented in the event that seawater intrusion is observed in the SeasideGroundwater Basin.4.1 GEOGRAPHIC AREA COVERED BY CONTINGENCY ACTIONSThe contingency actions described in Section 4.2 are only triggered by seawaterintrusion occurring inside the Seaside Groundwater Basin boundary asillustrated on Figure 1. Some wells monitored by the Watermaster, such as theFO‐10 shallow and deep wells, may be located outside the Seaside GroundwaterBasin boundary. Seawater intrusion observed at wells outside the adjudicatedboundary should not necessarily trigger the actions listed in Section 4.2, butshould trigger a review of the data by the Watermaster to assess necessaryactions to prevent Material Injury to the Seaside Groundwater Basin.4.2 ACTIONS ADDRESSING OBSERVED SEAWATER INTRUSIONThe specific actions that should be implemented if seawater intrusion is detected,as defined by the triggers in Section 3.2, are as follows.ACTION 1: VERIFICATIONWells with water quality indicative of seawater intrusion shall be re‐sampled assoon as possible. The re‐sampling should include the full suite of major cationsand anions, which will allow all of the indicators listed in Section 3 to be verified.Laboratory analyses should be conducted with an expedited turnaround time. Ifre‐sampling these wells verifies the presence of seawater intrusion in the SeasideGroundwater Basin, Actions 2 through 5 should be implemented.Seawater Intrusion Response PlanNovember 19, 2008 - 15 -
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: FINAL DRAFTOTHER FACTORSGroundwater
Page 21 and 22: FINAL DRAFT• Identify and/or inst
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
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FINAL DRAFT8007570Chloride Concentr
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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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