cultural sensitivity maps · 2015-01-26 · introduction these sediment sampling and analysis...

Appendix A

Cultural Sensitivity Maps

Figure A-1Cultural Resource Sensitivity: Calistoga Area

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Figure A-2Cultural Resource Sensitivity: St. Helena Area

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Figure A-3Cultural Resource Sensitivity: Conn Creek Area

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Figure A-4Cultural Resource Sensitivity: Yountville Area

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Figure A-5Cultural Resource Sensitivity: Oak Knoll Area

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Figure A-6Cultural Resource Sensitivity: City of Napa North

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Figure A-7Cultural Resource Sensitivity: Milliken-Sarco Area

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Figure A-8Cultural Resource Sensitivity: Browns Valley Area

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Figure A-9Cultural Resource Sensitivity: Central Napa Area

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Figure A-10Cultural Resource Sensitivity: Airport Area

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Appendix B

COPIES OF PERMITS

Forthcoming

Appendix C

CEQA COMPLIANCE DOCUMENTATION

InitialStudy/NegativeDeclaration–OnFileatDistrictOffice

Appendix D

Sediment Sampling and Analysis Guidelines

Stream Maintenance Manual for Napa County D‐1 March 2012

Appendix D: Sediment Sampling and Analysis Guidelines

Introduction

ThesesedimentsamplingandanalysisguidelinesaccompanythedescriptionofsedimentdisposalinChapter7of theStreamMaintenanceManual(Manual),and identifydisposaloptionsbasedoncharacteristicsofthesediment.Guidanceisprovidedforidentifyingsedimentsamplingfrequency,samplingmethodology,sedimentanalysis,andothersedimentcharacterizationactivities.Sedimentsampling,disposal,monitoring,andreportingconditionsissuedbytheSanFranciscoBayRegionalWater Quality Control Board (RWQCB) under the forthcomingWaste Discharge Order (No. R2‐2012‐XXXX)areincludedbyreferenceandasguidedbythe“BeneficialReuseofDredgedMaterials:SedimentScreeningandTestingGuidelines”developedbytheRWQCBinMay2000.Thesedimentsampling and disposal process will be coordinated annually between the RWQCB and the NapaCountyFloodControlandWaterConservationDistrict(District)aspartofthereviewandapprovalprocessforannualstreammaintenanceanddisposalactivities.

Sediment Disposal

Sediment disposal sites will be identified when the need for sediment removal activities arise;sedimentremovalanddisposalactivitiesmaynotbenecessaryeveryyear.SedimentdisposalsiteswillbereviewedandapprovedbytheRWQCBbasedonanalyticalresultsfromsedimentsamplingat the channels to bemaintained and in consideration of the ultimate fate of the sediment. Theconditions for approval will evolve as the RWQCB and District become familiarized with thecharacteristicsofsedimentremovedaspartofmaintenanceactivitiesandwithsedimentdisposalandreuseconditions.

In general, sediment disposal sites can be characterized into five categories based on potentialreuse or disposal opportunities. These categories include (1) on‐site reuse, (2) other wetland,channel, or floodplain restoration reuse, (3) upland agricultural or commercial reuse (dry), (4)landfilldisposal,and(5)hazardouswastedisposaloptions.Thesedisposaloptionsarelistedbelowin preferential order according to how well they support program objectives for ecologicsustainability.

Option1: On‐sitereuse. This includes reusing the sedimenton‐site (i.e., at theprojectsite) within the channel or easement area for various fill or restoration purposes. Forexample, sediment excavated from the channel bottom could be placed adjacent to theactive channel (remaining within the easement area), to enhance soil, vegetation, andriparian habitat conditions. Sediment could also be used on‐site for bank stabilizationpurposes.

Option 2: Wetland, channel, or floodplain restoration or enhancement. Option 2consists of beneficial reuse of the sediment outside or off‐site of District channel oreasement areas, but in a wetland, channel, or floodplain setting to support ecologicfunctioningandhabitat.Asexamples,gravelremovedfromonecreekthatdoesnotsupport

Appendix D. Sediment Sampling and Analysis Guidelines


steelhead or salmonids could be placed in another creek that does in order to enhancesalmonid habitat. Additionally, excavated sediment could be reused as part of habitatenhancementactivitiesalongtheNapaRivermainstem.

Under this option, sedimentwould be used as fill in an already approved and permittedrestoration project. This is a specific case where an approved and permitted projectrequirestheuseofsedimenttofillawetlandorenhancein‐streamhabitat.Itisimportantto note that this sediment disposal plan in noway encourages or sanctions the filling ofexisting wetlands. However, for restoration projects that are already approved andpermitted,itmaybepreferabletousesedimentmaterialsthatsharesimilarproperties.Inthisway,usinggoodqualityexcavatedchannelsedimentforreuseinawetland,channel,orfloodplainsettingmaybepreferableoradvantageoustousingotherfillmaterialorsoils.

Forthepurposesofthesedimentqualitycriteriadiscussedbelow,Option2sitesarelocatedinthevicinityofandpotentiallydraintowetlandsorwaterbodies.

Option 3: Upland agricultural or commercial reuse (dryupland sites). Under thisoption,sedimentwouldbereusedforuplandagriculturalorcommercialusesthataredry,wherebythesedimentwouldnotbesecondarilyerodedtostreamchannelsorwaterbodies.Demand for dry sediment is high, particularly for use as soil amendment for agriculturalcrops,constructionoffoundationpadsforbuildingsorstructures,orpermanentfillofpitsortolevelthelandscape.ItislikelythatuplanddisposalsiteswithinNapaCountywillbefrequentlyavailableandcanacceptlargequantitiesofsediment.

Option 4: Landfill disposal. In this option the sediment would be disposed at anapprovedandoperating landfill foruseasdailycovermaterial for landfilloperations.ThenearestoperatinglandfillsaretheUpperValleyDisposalandRecycling(UVDS)CloverFlatLandfilllocatedinSt.HelenaandthePorteroHillsSanitaryLandfillinSuisunCity.AnotherlandfilldisposaloptionistheRedwoodLandfilllocatedinNovato.Sedimentwouldbetakentothenearestlandfillinneedofcovermaterial.

TheDistrict, in conjunctionwith the City of Napa and the U.S. Army Corps of Engineers,maintainstwosedimentdisposalsitesinthesouthernportionofthecounty.ThesearetheEdgerly Island Disposal Site and the Napa Sanitation District Imola Site. Both sites areapproved by the USACE to receive sediment spoils from dredging of theNapa River andothersiteswithinthecounty. TheEdgerlyIslandDisposalSitehasthecapacitytoreceiveupto300,000cu.yds.ofsedimentandhasonlybeenusedonce; thesite isnearlyempty.TheNapaSanitationDistrictImolaSitehasthecapacitytoreceiveupto55,000cu.yds.ofsediment and has not been utilized since it was developed in 2006. Both sites operateunderWasteDischargeRequirements(WDRs)issuedbytheRWQCB.

Option 5: Hazardouswastedisposal. This option involves the disposal of sedimentscontaining hazardous levels of contaminants. Hazardous waste will be disposed atappropriatehazardouswaste facilities. Thenearesthazardouswaste landfill is located inKettlemanCity,California.

Thesefivedisposaloptionswillbeevaluatedindecreasingpreferencewithpotentialsiteselectionbasedonthequalityofsediment.Thepreferenceistoselectdisposaloptionsthatmostbeneficiallyreusethesedimentwiththeleastenvironmentaleffects.

It is anticipated that off‐site disposal (Options 3 and 4) would be proposed for the majority ofmaintenance activities. Disposal Option 2 would be implemented on rare occasions due to the



infrequencyofsedimentremovalandthespecificneedsofotherpre‐approvedrestorationprojectsin the County. Option 5would only be used if the sediment is deemedhazardous. The specificdisposal sites for theoptionsselectedwillbe identifiedaspartof thesedimentplanningprocessandapprovedbytheRWQCBpriortomaintenance.

Sample Analysis Approach

All sediment samples will be analyzed according to the forthcoming conditions of the RWQCBWasteDischargeRequirements ‐Monitoring andReporting Program (OrderNo. R2‐2012‐XXXX).Samplingparameters/analytesmaybemodifiedafterahistoryofsamplingisobtained. Thismayresult innot requiringmonitoring for someof these contaminantsunder certain situationsor atcertainlocations,ortheadditionofmoreparameters/analytesifdeemednecessarybytheRWQCB.

Analytestestedwillvarydependingontheproposedreuseofthesediment,asfollows.

If sediment is reused on‐site (Option1), no testing is requiredbecause it is assumed thesedimentqualitywouldnotchangefromexistingconditions.

If sediment is reused for wetland, channel, or floodplain restoration, where the newlyplaced sediment would be in contact with water bodies (Option 2), analysis would beconductedaccordingtothe“wetlandsurface”testingrequirementsstatedintheBeneficialReuse of Dredged Materials: Sediment Screening and Testing Guidelines (RWQCB 2000).Requiredanalysisincludessedimentchemistryandacutetoxicitytesting.

Ifsedimentisreusedforuplandagriculturalorcommercialusewheredrysedimentwouldbe permanently removed from the system (i.e., there would be no contact with waterbodies), thananalytes listed inTable1wouldbe tested. Thisanalyte list is the “wetlandfoundation, levee, and construction fill” requirements stated in the Beneficial Reuse ofDredgedMaterials: Sediment Screening and Testing Guidelines (RWQCB 2000). Requiredanalysisincludessedimentchemistry(Table1).Notethatthemajorityofproposeduplanddisposal sites would not generate leachate, thus the leachate testing requirements inRWQCB(2000)wouldnotbeconductedunlessdirectedbytheRWQCB.

IfsedimentistakentoalandfillforuseascovermaterialortotheEdgerlyIslandDisposalSiteortheNapaSanitationDistrictImolaSite,sedimentqualitytestingwouldbeconductedas requiredbyRWQCBpermits issued to those sites and in compliancewithDTSCwasteacceptanceregulations.

Sedimentexhibitinglevelsinthehazardousrange,asdefinedbytheCaliforniaDepartmentofToxicSubstancesControl(DTSC),wouldbetakentoapermittedhazardouswastefacility.

Sample Collection Frequency and Locations

Forsedimentremovalprojectsthatinvolvetheremovalanddisposaloflessthan200cubicyardsofsediment,onesamplewillbecollectedandanalyzed.Detailsonthemethodologyusedtocollectandcompositesamplesaredescribedbelow.

For sediment removal projects that require the removal and disposal of more than 200cubicyardsofsediment,onesamplewillbecollectedforeveryincrementof500cubicyards



of sediment to be removed (beyond the original 200 cubic yards). Details on themethodologyusedtocollectandcompositesamplesaredescribedbelow.

Sampling locations will be selected to represent overall sediment conditions at themaintenancesite. Samplingsiteswillbeselectedtotargetconditionsattheupstreamanddownstream ends of the project zone. As is feasible, sampling siteswill also specificallytarget conditions downstream of culvert crossings, culvert outfalls, and key streamconfluences.

Sediment Sampling Methodology

This guidance applies to discrete (single) samples and composite samples. All samples shall becollectedbymeansofahandtrowel,ahandauger,oranothersamplingmethodapprovedbytheregulatoryagencies.The individualcollectingthesamplewillhavethediscretionofchoosingthesamplingmethodwhichisthemostefficienttoperform.

AllsamplingequipmentwillbedecontaminatedusingAlconox©soapandrinsingwithdistilledorde‐ionizedwater.Latex‐freegloveswillbewornwhenhandlingcleanedequipment.Samplingwillbeconductedinaccordancewiththemethodsdescribedbelow:

HandTrowelProcedure

1. Removevegetationandwoodydebrisfromthegroundsurface.

2. If collecting a subsurface sample, use a shovel to dig down to the desired samplinginterval.

3. Useastainlesssteelhandtroweltocollectsoil.

4. Placesoilinanappropriatesamplingcontainer.

5. Replaceallexcavatedsoilstotheiroriginallocation(i.e.,backfillthesamplinghole).

HandAugerProcedure

1. Removevegetationandwoodydebrisfromthegroundsurface.

2. Usethehandaugertoadvancedowntothetopofthesamplinginterval.

3. Useahandaugertocollectsoilfromthedesireddepth.

4. Use a clean (decontaminated) tool to scoop the soil out of the auger and place in anappropriatesamplingcontainer.

5. Replaceallexcavatedsoilstotheiroriginallocation(i.e.,backfillthesamplinghole).

CompositeSedimentSamplingDiscrete sediment sampleswill be collected frommultiple locations to represent the entirewedgeof sedimentdesignated for removalusingahand trowelor auger.Discrete sampleswillbecomposited intoonesamplebymixing thesoil inadecontaminatedcontained, thenfillingthesamplingjars.Laboratoryanalyseswillbeperformedonthecompositesample.



SamplingDepthThe sampling depth will be determined in the field. At each sampling location, the staffcollectingthesamplesshallmakeanestimateofthedepthofthesedimentusingvisualcluesand/orexistingdata.Sedimentsamplesshallbecollectedatthesurfaceandat1ft.intervalsdowntoamaximum3ftlevel.Intheeventthatthedepthofthesedimentislessthan1foot,thenthesampleshallbecollectedatthesurface.Sampleswillbecollecteduptoamaximumdepthof3feetbecausecollectionofsamplesbelowthatdepthisprohibitivelydifficultduetothe finite strength of the individual collecting the sample, and the wet properties of thesediment,whichmaycauseaboreholetocollapse.Insomelocationsitmayevenbeinfeasibleto collect a sample at 3 feet bgs due to the unstable nature of the sediments or grain size(gravels or cobbles too large or compacted to sample). In the event that it is infeasible tocollectasampleat thedepth intervalspecified, thesampleshallbecollectedat thedeepestinterval possible (using 1/2 foot increments). Also note that the maximum depth at themajorityofsedimentremovalsitesisnotgreaterthan3feetbecausesedimentisremovedatthisthresholdduetothesignificantreduction inchannelconveyancecapacitywhichoccurswhensedimentisaccumulatedhigherthan3feet.

Other Sediment Sampling Details

Ingeneral,sampleswillbetakenfromthefinestsedimentatasamplingsiteandeveryattemptwillbe made to collect sediments that are representative of the materials to be removed. Mostcontaminantsareassociatedwithfine‐grainedsediment,anditisthereforeimportantthatsomeofthe samples contain the finest sediment that is present at a given project site. Fine sedimentsincludemud,silts,andfinersandymaterials.Asuitablefieldtestforgrainsizeistorubsedimentsbetween the fingers: finer sediments will feel smooth, whereas coarser sediments will be gritty(SWRCB 2008). Note that in many of Napa County channels, the grain size of accumulatedsediments is larger, in the largesandandsmallgravelranges. Contaminantsare lessapt tosorbontolargersizedmaterials.

Observed Contamination and Results That Exceed Water Quality Criteria

Forallprojects, anyobservedcontaminationasevidencedbychemical‐likeodors,oily sheens,orirregularly colored sediment would be immediately reported to the local fire department’shazardous materials team and the appropriate RWQCB staff person in the Cleanups andInvestigationsUnit. TheRWQCBwilldirecttheDistrictonhowtohandleandremovepotentiallyhazardoussediment.

In addition, if sediment test results are found to exceed water quality criteria, the District willcoordinate with the RWQCB to develop an action plan to properly handle and dispose of thesediment.UndertheguidanceoftheRWQCB,thesedimentremovalactivitymayproceedaccordingtotheactionplanorthemaintenanceactivitymaynotbeconducted.



Sediment Disposal Best Management Practices

SedimentDisposalBestManagementPracticesarediscussedinChapter7oftheManualandinTable3‐1,theStreamMaintenanceManualBestManagementPracticesTable.

Reporting of Sediment Sampling Results

TheDistrictwillmaintainrecordsoffieldsamplingmethods,locations,depths,analysis,andresults.

TheDistrictwillsubmitcompletelaboratorysedimentsamplingresultstotheRWQCBwhensedimentremovalactivitiesareproposed.

TABLE 1: Sediment Sampling Analyte List EPA Test Method1

Analyte ReportingLimit for Soil (dry weight mg/kg)

Analyte (cont.) ReportingLimit for Soil

(mg/kg)

Conventional Parameters

Grain Size (%) 0.1

9060 Total organic carbon (TOC) (%) 0.1

Total solids (%) 0.1

6020 Total Metals

Arsenic 0.1

Cadmium (total) 0.1

Chromium (total) 0.1

Copper (total) 0.1

Lead (total) 0.1

Mercury (total) 0.02

Nickel (total) 0.1

Selenium (total) 0.1

Silver (total) 0.1

Zinc (total) 1

Butyltins

Monobutyltin 0.01 Total Butyltins NA

Dibutyltin 0.01

Tributyltin 0.01

Tetrabutyltin 0.01

1668 Polychlorinated biphenyls (PCBs)

Aroclor 1242 0.20 Total Aroclors NA

Aroclor 1248 0.20

Aroclor 1254 0.20

Aroclor 1260 0.20

1668 Organochlorine Pesticides

Aldrin 0.02 Endosulfan I 0.02

α‐HCH (hexachlorocyclohexane)

0.02 Endosulfan II 0.02

1 The most recent version of EPA’s Test Methods for Evaluating Solid Waste, Physical/Chemical Methods", also known as SW‐846, will be used.



EPA Test Method1

Analyte ReportingLimit for Soil (dry weight mg/kg)

Analyte (cont.) ReportingLimit for Soil

(mg/kg)

β‐HCH 0.02 Endosulfan sulfate 0.02

γ‐HCH (Lindane) 0.02 Endrin 0.02

δ‐HCH 0.02 Endrin aldehyde 0.02

Chlordane (tech) 0.02 Heptachlor 0.02

2,4'‐DDD 0.02 Heptachlor epoxide 0.02

4,4'‐DDD 0.02 Toxaphene 0.02

2,4'‐DDE 0.02

4,4'‐DDE 0.02

2,4'‐DDT 0.02

4,4'‐DDT 0.02

Total DDT MA

Dieldrin 0.02

8270 Poly Aromatic Hydrocarbons (PAHs)

1‐Methylnaphthalene 0.2 Low molecular weight PAHs, sum NA

1‐Methylphenanthrene 0.2 High molecular weight PAHs, sum NA

2,3,5‐Trimethylnaphthalene 0.2 PAHs, total NA

2,6‐Dimethylnaphthalene 0.2

2‐Methylnaphthalene 0.2

2‐Methylphenanthrene 0.2

3‐Methylphenanthrene 0.2

Acenaphthene 0.2

Acenaphthylene 0.2

Anthracene 0.2

Benz(a)anthracene 0.2

Benzo(a)pyrene 0.2

Benzo(b)fluoranthene 0.2

Benzo(e)pyrene 0.2

Benzo(g,h,i)perylene 0.2

Biphenyl 0.2

Chrysene 0.2

Dibenz(a,h)anthracene 0.2

Fluoranthene 0.2

Fluorene 0.2

Indeno(1,2,3‐cd)pyrene 0.2

Naphthalene 0.2

Perylene 0.2

Phenanthrene 0.2

Pyrene 0.2

NOTE: this table is replicated from Table 5 “Routine Parameters and Target Analytes for Evaluation of Dredged Material (RWQCB 2000) 1 The most recent version of EPA’s Test Methods for Evaluating Solid Waste, Physical/Chemical Methods", also known as SW‐846, will be used.



References Cited

CaliforniaDepartmentofToxicSubstancesControl(DTSC).2005.CaliforniaRegulations,Title22,Chapter11,Article3.CharacteristicsofHazardousWaste.Available:http://www.dtsc.ca.gov/LawsRegsPolicies/Title22/upload/OEARA_REG_Title22_Ch11_Art3.pdf.

CaliforniaStateWaterResourcesControlBoard(SWRCB).2008.SWAMPStatewideStreamContaminantTrendMonitoringatIntegratorSites.Available:http://www.swrcb.ca.gov/water_issues/programs/swamp/docs/workplans/statewide_stream_contaminants_trend_montoring_plan.pdf

SanFranciscoBayRegionalWaterQualityControlBoard(RWQCB).2010.WaterQualityControlPlan(BasinPlan)fortheSanFranciscoBayBasin(Region2).Oakland,CA.Available:http://www.waterboards.ca.gov/sanfranciscobay/basin_planning.shtml

RWQCB.2000.BeneficialReuseofdredgedmaterials:sedimentscreeningandtestingguidelines.DraftStaffReport.Available:http://www.waterboards.ca.gov/sanfranciscobay/water_issues/available_documents/benreuse.pdf

U.S.EnvironmentalProtectionAgency(USEPA)2008.RegionalScreeningLevels(RSL)forChemicalContaminantsatSuperfundSites.RSLTableUpdate.Region9.September12,2008.Available:http://www.epa.gov/region09/waste/sfund/prg/pdf/master_sl_table_bwrun_12SEP2008.pdf

cultural sensitivity maps · 2015-01-26 · introduction these sediment sampling and analysis...

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