indicators of seawater intrusion - Seasidebasinwatermaster.org

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FINAL DRAFTThe following activity shall be initiated within 90 calendar days of the Watermaster Board adopting recommendations from the previous activities:• Modify pumping to achieve the desired groundwater gradient.Groundwater pumping at the most influential production wells should bemodified to achieve the groundwater gradient calculated above.ACTION 5: FOCUS SUPPLEMENTAL SUPPLIES TO HALT AND REVERSESEAWATER INTRUSIONWhen a supplemental water supply becomes available for Seaside GroundwaterBasin replenishment, the Watermaster will seek to have the supplemental waterused strategically to protect the Seaside Groundwater Basin from furtherseawater intrusion, and to restore the Basin to pre‐seawater intruded conditions.Supplemental supplies should be used to both offset pumping that causes theobserved seawater intrusion, and to raise groundwater levels to reverse seawaterintrusion.Seawater Intrusion Response PlanNovember 19, 2008 - 18 -
FINAL DRAFTSECTION 5REFERENCESBachman, S. 2005. Seaside Basin – Principles of Settlement, October 20, 2005.California American Water v. City of Seaside et al. Monterey County Superior Court,Case Number M66343, filed in Monterey County Superior Court on March 27,2006, amended on February 9, 2007HydroMetrics LLC. 2007. Seawater Intrusion Analysis Report, Seaside Basin,Monterey County, California, October, 2007, 37 p.――――. 2008. Seawater Intrusion Analysis Report, Seaside Groundwater Basin,Monterey County, California, October, 2008, 67 p.Jones, B.F., A. Vengosh, E. Rosenthal, and Y. Yechieli. 1999. Geochemicalinvestigations, in Bear, Jacob, and others, eds., Seawater intrusion in coastalaquifers—Concepts, methods and practices, Dordrecht, The Netherlands, KluwerAcademic Publishers, p. 51–71.Monterey Peninsula Water Management District (MPWMD). 1999. ExpandedWater Conservation and Standby Rationing Plan, Rule 160 et seq. added byordinance number 92, January 29, 1999, updated by ordinance number 119,March 21, 2005.MPWMD. 2008. Interim Seawater Intrusion Contingency Plan, March 2008.Seaside Groundwater Basin Watermaster. 2006. Seaside Basin Monitoring andManagement Program, May 17, 2006, 24 p.United States Environmental Protection Agency (US EPA). 2006. Data QualityAssessments: Statistical Methods for Practitioners (EPA QA/G‐9S). February 2006.――――. 2008. Drinking Water Contaminants, retrieved fromhttp://www.epa.gov/safewater/contaminants/index.html#mcls, accessed on June 16,2008, last updated on Thursday, June 5 th , 2008.Seawater Intrusion Response PlanNovember 19, 2008 - 19 -
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 and 20: FINAL DRAFTSECTION 4SEAWATER INTRUS
Page 21: FINAL DRAFT• Identify and/or inst
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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