Appendix H Fairy Shrimp Habitat Assessment
MEMORANDUM DOW Chemical Company Vernal Pool Fairy Shrimp Habitat Assessment PREPARED FOR: COPY TO: PREPARED BY: DATE: Species Information GabrielMas/DOW RussellHuddleston/CH2MHILL March9,2015 Vernalpoolfairyshrimp(Branchinecta lynchi)isfederallyhlistedthreatenedspeciesthatrangesinsize between0.4and1.0inchlong(figure1).thisspeciesisfoundinvernalpoolsandotherseasonalwetlands thatarepondedwithwaterduringthewetwintermonths,butbecomedryinthelatespringandsummer. Vernalpoolfairyshrimpoccurinavarietyofseasonalpooltypesincludingsmallclearpools,largerturbid alkalinepools,sandstonerockpools,grassypoolsandoccasionallyinartificialdepressionsthatholdwater longenoughduringthewintermonths. Figure 1 - Female vernal pool fairy shrimp VernalpoolfairyshrimparemostcommonlyfoundintheCentralValleybuttheirrangeextendsfrom southerncaliforniatosouthwesternoregon.thereare19reportedoccurrencesofvernalpoolfairyshrimp incontracostacounty,includingonereportedoccurrencefromapondeddepressionalongarailroad accessroadonthedowproperty,justeastofdowestslough(attachmenta). Assessment of Potential Habitat TheDowChemicalCompanyisplanningtoaddadditionalrailcarparkingatoneoftwopotentiallocationson thepittsburg,californiaplant.onelocationwouldbeinaleveledopengravelareaonthewestsideofthe monohfillsite.theotherareawouldbeadjacenttoexistingrailroadtracksontheeastsideofdowest slough. Shallowpondingwasnotedineachareafollowingheavyrains.Thepondedareaswerethereforeevaluated forthepotentialtosupportvernalpoolfairyshrimp. AsitevisitwasconductedbyCH2MHILLwetlandecologistRussellHuddlestonwithGabrielMasfromDOW onfebruary12,2015fourdaysfollowingastormevent.totalrainfallreportedforpittsburgbetween February6and8was2.86inches,enoughtoresultinthepresenceofsurfacewaterinbothlocationsatthe timeofthesurvey. DOW-MNP_FSHABITATASSESMENT_TM_150319.DOCX/[INSERT JETT ID] 1
DuringthesitevisitoneshallowpondedarewasidentifiedwestofthemonoHfillareathatwouldbe impactedbytheconstructionofarailspur.thispondedareawasashallowpuddle,lessthan2hinchdeepin anopengravelarea(figure2).afollowupvisitsofthislocationonfebruary18,2015bymr.masnotedno remainingsurfacewaterinthisarea(figure3).thistemporaryshallowpondingwasnotconsideredto providesuitablehabitatdietothelimiteddurationofponding.thereforenopotentialvernalpoolfairy shrimphabitatwouldnotbeaffectedbytheproposedrailspurintheareawestofthemonohfillarea. Figure 2. Shallow ponding observed on February 12, 2015, four days after heavy rains in the area. The location west of the mono-fill was considered unlikely habitat for vernal pool fairy shrimp. 2 DOW-MNP_FSHABITATASSESMENT_TM_150319.DOCX/[INSERT JETT ID]
Figure 3. Area where shallow ponding was observed taken on February 18, 2015, nine days following heavy rains. ShallowpondingwasalsoobservedduringtheFebruary12,2015sitevisitintheareaeastofDowestSlough adjacenttoexistingrailroadspur(figure4).thisfeaturewasamoredefinedbasinwithdeeperwater(4h5 inches).noaquaticinvertebrateswereobservedintheclearwatersatthetimeofthesurvey,butit slikely thatthebasinhadonlyrecentlyfilledasaresultofthestormeventsinearlyfebruary.followupvisitsto thislocationweremadebymr.masonfebruary18and23,2015.theextentofpondingandwaterdepth werebothsignificantlyreducedduringthefebruary18 sitevisit(figure5)andnostandingwaterwas presentinthisareaonfebruary23(figure6).whilethisareawasconsideredtoprovideverymarginal habitat,vernalpoolfairyshrimphavebeenfoundinsimilartypesofdepressionsandhavebeenreported fromthisgeneralvicinity(attachmenta).thereforethisshallowpondedareasadjacenttotheexisting trackscouldnotbedefinitivelyruledoutaspotentialhabitat. DOW-MNP_FSHABITATASSESMENT_TM_150319.DOCX/[INSERT JETT ID] 3
Figure4.PondedareaadjacenttoexistingrailroadtracksintheareawestofDowestSlough; February12,2015 4 DOW-MNP_FSHABITATASSESMENT_TM_150319.DOCX/[INSERT JETT ID]
Figure5.PondedareaadjacenttoexistingrailroadtracksintheareawestofDowestSlough; February18,2015 DOW-MNP_FSHABITATASSESMENT_TM_150319.DOCX/[INSERT JETT ID] 5
Figure6.PondedareaadjacenttoexistingrailroadtracksintheareawestofDowestSlough; February23,2015 6 DOW-MNP_FSHABITATASSESMENT_TM_150319.DOCX/[INSERT JETT ID]
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