indicators of seawater intrusion - Seasidebasinwatermaster.org

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FINAL DRAFTthe one in Exhibit A of the Amended Decision. As such, there is no conflictbetween this SIRP and Exhibit A of the Amended Decision.2.2 EXPANDED WATER CONSERVATION AND STANDBYRATIONING PLANThe regulations imposed by MPWMD’s Expanded Water Conservation and StandbyRationing Plan (MPWMD, 1999) state that Stage 1 through Stage 7 waterconservation and rationing may apply to water distribution system users andwater users within the Monterey Peninsula Water Resources System (MPWRS) inresponse to limited water supply. These stages provide, among other benefits,responses to emergency situations where immediate reductions in water use arenecessary to ensure public health, safety or welfare.The plan authorizes the MPWMD Board of Directors to, from time to time,determine by resolution that any water distribution system or set of water userswithin the MPWMD area shall be subject to water rationing as provided in theordinance, based on conservation and reduction percentages. Specifically, Stage3 water conservation requires a fifteen percent reduction in CAW use. Stage 4water rationing requires a 15 percent reduction for all water users, whilemaintaining the provisions of Stage 3 water conservation.The Expanded Water Conservation and Standby Rationing Plan deals only withrationing, and not with groundwater pumping. Because the Watermaster’s onlyauthority is pumping regulation, and not end‐use regulation, there is no conflictbetween this SIRP and the Expanded Water Conservation and Standby RationingPlan.2.3 CONTINGENCY PLAN FOR SEAWATER INTRUSIONThis SIRP builds on the Contingency Plan for Seawater Intrusion, Seaside Basin,developed by Dr. Steve Bachman (2005). More detailed seawater intrusionindicators have been developed since the Contingency Plan for Seawater Intrusionwas presented as a deposition exhibit during the adjudication. This SIRP is anupdate using site‐specific geochemical indicators of seawater intrusion. Based onthe presence of specific seawater intrusion indicators, various actions, includingpumping redistribution and reduction, are defined in this SIRP.Seawater Intrusion Response PlanNovember 19, 2008 - 4 -
FINAL DRAFTThere is no requirement for this SIRP to be consistent with the 2005 ContingencyPlan for Seawater Intrusion, Seaside Basin, however it was used as a referencedocument while developing this SIRP.SECTION 3SEAWATER INTRUSION INDICATORS ANDTRIGGERSSeawater intrusion must be detected within the Adjudicated boundary of theSeaside Groundwater Basin, and declared by the Watermaster before theresponse plan can be implemented. This section presents general indicators ofseawater intrusion, and discusses how to identify incipient seawater intrusion inthe Seaside Groundwater Basin. A group of positive indicators would trigger acontingency action.This SIRP has adopted the following terminology for identifying and containingseawater intrusion:Indicator: A chemical characteristic or groundwater level that suggests potentialseawater intrusion. No one indicator definitively identifies seawaterintrusion.Trigger: A specific group of indicators that, taken together, can identify seawaterintrusion.Contingency Actions: A series of actions that should be implemented if thetriggers indicate seawater intrusion is occurring.Each indicator of seawater intrusion is addressed separately below. Fourseawater intrusion indicators have been developed for the monitoring programincluding chloride concentrations and trend analysis, sodium/chloride molarratio trend analysis, cation and anion distributions on Piper and Stiff Diagrams,chloride concentration maps, and groundwater levels.Chloride concentration is the only indicator with a threshold value or specificnumerical target that indicates seawater intrusion. The threshold values arebased on historical groundwater monitoring data collected from 12 wells withinthe Seaside Groundwater Basin (Figure 1). The 12 wells represent six well pairsfrom the MPWMD monitoring well network.Seawater Intrusion Response PlanNovember 19, 2008 - 5 -
Page 3 and 4: FINAL DRAFTTABLE OF CONTENTSSECTION
Page 5 and 6: FINAL DRAFTSECTION 1BACKGROUND AND
Page 7: FINAL DRAFTSECTION 2CONSISTENCY WIT
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 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
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FINAL DRAFT[ Cl−]average56 + 54 +
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FINAL DRAFT4) Because ‐13 is less
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FINAL DRAFTTable C‐4: Pearson’s
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FINAL DRAFT90085Chloride Concentrat
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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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