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CHERRY CREEK BASIN WATER QUALITY AUTHORITY

TECHNICAL ADVISORY COMMITTEE

MODIFIED MEETING AGENDA

Date: Thursday, March 5, 2015 Time: 8:30 AM Place: CliftonLarsonAllen LLP 8390 E. Crescent Parkway, Suite 500 Greenwood Village, CO 80111-2814, (303) 779-4525 Call to Order

Action Items

1. Approval of February 5, 2015 Minutes (Chuck, 2 minutes, will be sent separately) 2. Approval of Destratification System 2015 Maintenance Program (Jim, 5

minutes, attachment) 3. Approval of 2 Site Applications (both Castlewood Water & Sanitation District)

(Chris Muller, LRE, 5 minutes each, 2 attachments) 4. TAC Recommendation to Board re: Authority Support for Legislation

Clarifying and Limiting Water Rights Requirements for Regional Detention and Infiltration Facilities (Bill, 10 minutes, attachment)

TAC Administration Items Board/TAC Coordination (Chuck, 3 minutes)

Discussions

Technical Areas of Expertise on the TAC (Rick, 5 minutes)

Items for TAC from Board

Development of Communications Plan for 2015 (Destratification System Off) (Rick, 15 minutes)

Staff Report re: 2014 Cyanotoxins Monitoring - Process/Timing (Chuck, 5 minutes, attachment)

Potential GEI Reservoir Sediment Study (Rick, 5 minutes, attachment)

1

Subcommittee & Committee Reports

Reservoir Model Committee (Bill, 2 minutes)

Water Quality Committee (Katie, 1 minute)

Future Agendas

March Meeting: Beneficial Use Endpoints

April Meeting: Selection of Management Scenarios for Reservoir Model

May Meeting: Watershed Model II

Destratification Committee (No Report)

Stormwater Subcommittee (Lanae, 2 minutes) Cherry Creek Stewardship Partners Report (Casey, 5 minutes)

Capital Project & Maintenance Report CIP & Maintenance Status Report (Jim, 2 minutes, attachment)

Reservoir Monitoring Monthly Report of Water Quality Data (Craig, 5 minutes, 2 attachments)

Regulatory Reports CCBWQA Annual Report & Executive Summary (Katie, 10 minutes)

Report incorporating comments received and draft Executive Summary will both be sent out separately.

March Regulatory Update (Katie, 1 minute, attachment) Other Items

Adjournment

Attachments: Draft Minutes WQ Committee 02-05-15 (will be sent separately) Havana Street Lift Station Site Application Recommendation (included w/ modified agenda) Republic Park Lift Station Site Application Recommendation (included w/ modified agenda) Memo re: Legislative Support for Regional Stormwater Detention (included w/ modified agenda) Destratification System 2015 Maintenance Program Memo 2014 Cyanotoxins Monitoring - Process/Timing Potential GEI Reservoir Sediment Study 2014 Capital Project and Maintenance Status Report February 23, 2015 Water Quality Data (Two Attachments) March Regulatory Update

2

Cherry Creek Basin Water Quality Authority Technical Advisory Committee January 8, 2015 Minutes

Member Attendees

Rick Goncalves, Chairman Jim Dederick, Douglas County Casey Davenhill, Cherry Creek Stewardship Partners Hope Dalton, Tri-County Health Department (TCHD) Jacob James, Town of Parker Lanae Raymond, SEMSWA Rich Borchardt, Urban Drainage & Flood Control District Max Grimes, Special Districts Jill Piatt-Kemper, Aurora John Cotten, City of Lone Tree Steve Miller, Arapahoe County David Van Dellen, Town of Castle Rock Bahman Hatami, Colorado Parks & Wildlife (CPW)

Other Attendees Mindi May, CPW Rhonda Sandquist, BHFS Bill Villagambros, TCHD Craig Wolf, GEI William Ruzzo, WPR, PE, LLC Katie Fendel, Leonard Rice Engineers (LRE)

Jim Swanson, JRS Engineering Consultants Chuck Reid, CliftonLarsonAllen, LLP (CLA) Call to Order The meeting was called to order at 8:30 a.m. by Chairman Goncalves. Action Items

1. January 8 and January 29, 2015 Minutes: Mr. Van Dellen moved and Ms. Dalton seconded a motion approving the minutes. The motion passed.

Administrative Items

1. Board/TAC Coordination: in January the Board: Approved a change order for Hydros Consulting for review of 2014 data; Decided to request proposals later in 2015, for the 2016 Sampling & Monitoring

contract; and Retained the existing leadership, with Susan Squyer as Chairman, Stephanie Piko as

Vice-Chair, and John McCarty as Secretary.

2. Email Practices: Mr. Reid is requesting that the TAC and Board remain deliberate with email practices, as member entities may have access to working and draft documents that need to

be identified as such, if shared with people external to the organization; as well as judiciously using the “reply to all” feature.

Discussion

1. Destratification 2015 Operations: Following-up on discussions held at the 1/22/15 joint Water Quality and Reservoir Destratification Committees’ meeting, the Authority’s outsourced staff unanimously recommended that the Destratification System not be operated in 2015. (These recommendations are available in the TAC’s “post-packet” from this meeting, contact CLA for details.) The TAC discussed this issue at length, with discussion points broadly classified below:

Reasons to Keep the System Turned-Off in 2015

Reasons to Operate the System in 2015

An additional year of data will be valuable as the Authority makes Management decisions.

The general public perception about the Destratification System is that it improves water quality.

A 2nd year of data will help determine relevance and/or relationship between cyanobacteria blooms (if any) and the Destratification System operations.

Operations may improve dissolved oxygen goals in the upper part of the water column.

A 2nd year of data will assist the Authority in its determination about whether or not cyanobacteria monitoring needs to be included in the Authority’s Base Monitoring Plan.

The additional data will only provide nominal value for the management decisions the Authority makes in its quest for Reservoir water quality.

Additional data will help the Authority better understand mixing effects that come from the Destratification System’s operations.

Other factors referenced and/or discussed included:

If the system remains off, the TAC wants: o Research on how this may impact the System’s long-term operations,

and a plan to mitigate negative impacts. o A contingency plan in case of significant cyanobacteria blooms or other

significant water quality degradation occur. o A communication plan that addresses all of these issues.

In 2013, GEI took two “opportunistic” cyanobacteria samples in the Reservoir. Additional modeling (i.e. bubble plumes) that may be beneficial as the Authority

researches the System’s effect on Water Quality. Cyanotoxins are an emerging contaminant of concern. Exploration of different operations’ scenarios if/when a decision is made to

resume operations.

Ms. Dalton expressed TCHD’s concern for the impact cyanotoxins may have on Reservoir users (people, pets, and wildlife) and the lack of surveillance/reporting protocols to monitor these potential impacts. Following discussion, Mr. Cotten moved and Ms. Raymond seconded a motion to keep the Destratification System turned-off in 2015. Ms. Piatt-Kemper requested a friendly amendment to the motion: to keep the Destratification System turned-off in 2015 and to create a communication plan (surrounding this decision). The amendment was accepted by Mr. Cotten and Ms. Raymond, and the motion was approved. Ms. Dalton moved and Mr. Dederick seconded a motion requesting that the Authority Board be notified that the TAC believes that a decision to keep the Reservoir Destratification System off in 2015 reinforces the need for cyanotoxin monitoring. The motion passed.

2. Chlorides/Road Salt Due to technical difficulties with the AV presentation and the length of the previous discussion, this item was postponed.

Committee Reports (Committees have membership from both the TAC and Board of Directors) 1. Reservoir Model: Mr. Ruzzo suggested that TAC begin discussions on the process for

identification of reservoir model scenarios. The TAC requested that GEI obtain an approximate cost per model run to assist with further discussion, which will begin at the Water Quality Committee in February. Chairman Goncalves encouraged Board Members to attend the WQC meeting for this discussion.

2. Water Quality Committee. No additional report.

3. Destratification Committee: No report.

Sub-Committee Reports (Sub-committees are comprised solely of TAC Members)

1. Stormwater: No report. Cherry Creek Stewardship Partners Casey Davenhill reported:

On the successful “Hawk Walk” at Cottonwood Creek; Cherry Creek State Park has a new park ranger who is bringing new energy to the

interpretive services available from the State Park volunteers and staff; Beaver activity is evident at the Cottonwood Creek monitoring station and is impacting flow

data collected at the site; WQCD requested that she suggest candidates for a governor’s appointee for the Board; The Stewardship Partners are interested in what is happening with the US Army Corps of

Engineers’ Cherry Creek Dam Safety Study noting that, “In the absence of details, people make things up.”

She will be meeting with the new Marina Vendor, who is interested in the Authority’s work and environmental education. Mr. Hatami encouraged care and sensitivity from CCBWQA contractors who reach-out to State Park Vendors.

Capital Projects Beyond the report in the packet, Mr. Swanson:

Attended the USACE Dam Safety Analysis scoping session held on 1/22/15, is on the email list as an interested party, and will track this issue as needed. The USACE is updating this safety analysis with new probable maximum flood data. Information about this project and its relationship with the Authority’s mission will be brought back to the TAC and Board as needed.

Provided information on the Piney Creek Stream Stabilization Project; Noted that the 2014 Destratification System Annual Report was included in the packet; and He will answer questions about any of the above as needed.

Reservoir & Watershed Monitoring – no additional report Regulatory Reports Beyond the report in the packet, Ms. Fendel noted that she will be sending the draft annual report later in February and is requesting comments by 2/20. Other Items None Adjournment With no further business to conduct Chairman Goncalves adjourned the meeting at 11:10 a.m. Respectfully Submitted, ______________________________ Secretary for the Meeting

6013 E. Briarwood Drive – Centennial, CO 80112 (303) 726-5577

MEMORANDUM TO: Rick Goncalves, CCBWQA TAC Chair CC: Chuck Reid, CCBWQA Manager FROM: Jim Swanson DATE: February 23, 2015 SUBJECT: Destratification System 2015 Maintenance Program

The Authority Board, at their February 19, 2015 meeting, approved TAC's recommendation to not operate the destratification system in 2015. This will be the second consecutive year that the destratification system has not operated during the aeration season (Mid-May through Mid-November). Based on my previous understanding, the aeration system may be operated at some time in the future and that it should be maintained in a "ready state" so that at such time the system is to be turned on it can be up and running within a short period of time. As background regarding the 2014 Maintenance Program:

The compressor's electric motor was replaced in April 2014, at which time the 16,000 hour compressor service was performed which generally included an oil change, filter replacements, and the replacement of various equipment parts recommended by the manufacturer.

No maintenance was performed on the "in reservoir" aeration system in 2014. In 2014, the air compressor was exercised on a weekly basis during the aeration season allowing it to operate at varying "load" and "unload" pressures for varying lengths of time from one hour to three plus hours. The piping and valves were reconfigured in the five aeration zone manholes in 2014 to allow the compressed air to blow-off into the atmosphere so that no compressed air was being induced into the reservoir. The "in reservoir" aeration system was not operated or tested in 2014. Earlier this year, I contacted our contractor, B&RW, regarding the potential issues related to not operating the "in reservoir" aeration system for a second year. It was learned that approximately two-thirds of the system lies within the silty bottom area of the reservoir and the other third lies within the sandy bottom area. The hoses and tubing delivering the compressed air to the individual aerators tends, over time, to settle into the silt. By performing the routine maintenance of the system annually, the hoses and tubes can be hooked with an anchor type hook and brought to the surface for inspection, cleaning and repair, if needed. It is anticipated that if the "in reservoir" aeration system isn't inspected in 2015, the system may become too imbedded in the silt and diving will be required. It is estimated the cost to dive for the lines could be three to four times more than bringing them to the surface using the hook. It is my recommendation for the Authority to continue to exercise the aeration system compressor during the 2015 season, following the same practice as done in 2014. Additionally, it is recommended to contract with B&RW early this year to inspect the "in reservoir" aeration system, repair any broken connections and tabulate a list of repair/replacement parts needed to place the system in a "ready state" condition. Then, in 2016, if the decision in January is to operate the system, the parts can be ordered and repair work completed prior to aeration season. Please be aware that the aeration system will need to operate intermittently during the 2015 inspection to aide in locating the aerators within the reservoir. It can be operated at low pressure and intermittently so as to minimize impacts on the water quality monitoring.

JRS ENGINEERING CONSULTANT, LLC

February26,2015Mr.RickGoncalvesChairman,TechnicalAdvisoryCommitteeCherryCreekBasinWaterQualityAuthority8390EastCrescentParkway,Suite500GreenwoodVillage,CO80111RE: HavanaStreetLiftStationSiteApplicationforCastlewoodWaterandSanitationDistrictDearMr.Goncalves,OnbehalfoftheCherryCreekBasinWaterQualityAuthority(Authority),LeonardRiceEngineers,Inc.(LRE)hasreviewedtheHavanaStreetLiftStation(LiftStation)SiteApplicationaspreparedbyMerrick&Company(Engineer).TheownerandapplicantfortheLiftStationisCastlewoodWaterandSanitationDistrict(CWSD)(Applicant)(Owner).LRE'sreviewwasforcompletenessandcompliancewiththeAuthority’sapplicableregulations,policies,andguidancedocuments.

Project Background:

TheSiteApplicationwassubmittedbytheApplicanttotheAuthorityonJanuary27,2015.TheexistingLiftStationconsistsofaseriesof4undergroundvaultsthatactasabarscreenvault,wetwell,pumpvault,andelectricalvault.TheSiteApplicationisformodificationstotheLiftStationthatincludemovingelectricalcontrolsandbackuppowergeneratorequipmentfromtheelectricalvaulttobeplacedabovegroundadjacenttotheexistingpumpstationvaults.Oncetheelectricalcontrolsandbackupgeneratorequipmenthasbeenremovedfromtheelectricalvault,itwillbeconvertedintooverflowstorageforthepumpstation.Theadditionaloverflowstoragewillprovideatotalof27,133gallonsofoverflowstorage.Theoverflowstoragewillprovide1.6hoursofemergencystorageatthepeakinflowrateof286gallonsperminute.AspartoftheupgradestotheLiftStation,thebackuppowergeneratorwillbeupgradedtobeabletopowerall3pumps,locatedinthepumpvault,andthegeneratorwillbeconvertedtorunoffnaturalgasratherthandieselfuel.TheLiftStationservesanareathathasreached94%buildoutandtheemergencystorageissizedfor100%buildout.

Guidance Documents and Scope of the Review:

TheSiteApplicationwasreviewedagainstthefollowingapplicableguidancedocuments:

RegulationNo.22,“RegulationforSiteApplicationProcess”(September2009)

RegulationNo.72,“CherryCreekReservoirControlRegulation”(November2012)

WaterPollutionControlProgramPolicyNo.WPC‐DR‐1,“ColoradoDesignCriteriaforDomesticWastewaterTreatmentWorks”(September2012)

Mr.RickGoncalvesFebruary26,2015Page2of4

CherryCreekBasinWaterQualityAuthority,“CherryCreekReservoirWatershedSiteApplicationReviewProcessEmergencyResponsePlanCriteria”(March28,2002)

ThepurposeandscopeofLRE’sreviewissummarizedasfollows:

ProvideareviewoftheSiteApplicationandEmergencyResponsePlan,relativetotherequirementsandresponsibilitiesoftheAuthority.

ProvideopinionsonthethoroughnessandcompletenessoftheEmergencyResponsePlan.

ProvideopinionsonwhethertheEmergencyResponsePlanandSiteApplicationmeetthecriteriaasdefinedbytheAuthority.

TheColoradoDepartmentofPublicHealthandEnvironment’sWaterQualityControlDivision(Division)isthetechnicalreviewerforSiteApplications.TheDivisionisultimatelyresponsibleforreviewingthetechnicalcompletenessandcorrectnessofthesubmittal.

Comments:

ProvidedbelowareourcommentsrelativetotheAuthority’sconcerns:

Location:

TheLiftStationislocatedneartheintersectionofEastArapahoeRoadandSouthHavanaStreet(seeattachedmap).TheFloodInsuranceRateMap(FIRM)providedshowsthesitelocatedinZoneX(minimalfloodhazard).ThenearestwaterordrainagewayisGoldsmithGulchthatislocated0.4milesfromtheLiftStation.TherearenocommentsregardingthelocationoftheLiftStation.

General Design:

ThemodificationstotheLiftStationconsistofremovingandupgradingcontrolsandgeneratorequipmentfromtheexistingelectricalvaultandplacingthecontrolsandequipmentaboveground,adjacenttotheexistingvaults.TheexistingelectricalvaultwillbeconvertedintooverflowstoragefortheLiftStationtoprovided1.6hoursofemergencystorageatpeakinflow.Anoverflowpipewillbeinstalledattheoverflowelevationtoconnectthewetwelltotheexistingelectricalvault.Avalveddrainlinewillbeinstalledatthebottomofthetanktodraintheexistingelectricalvaultbacktothewetwellforpumping.TherearenocommentsregardingthegeneraldesignoftheLiftStation.

Identification of Potential Overflow Causes:

Nocomments.


Operation and Maintenance Practices to Prevent Occurrence and Effects of Sanitary Sewer Overflows:

CWSDcontractstheoperationandmaintenanceoftheLiftStationtoanoutsideagency.Aplanisinplacefortheoperatortovisitsthesiteonceaweektoinspecttheliftstation,testalarms,andtestthebackuppowergenerator.ThemaintenanceplanshouldbeupdatedtoincludeexercisingvalvesattheLiftStation.

Engineering Features to Address Sanitary Sewer Overflows:

OverflowProtection

Convertingtheelectricalvaultintooverflowstoragewillprovideatotaloverflowstorageof27,133gallonsinthewetwellandtheconvertedelectricalvault.Atapeakinflowrateof286gallonsperminute,theoverflowstoragewillprovide1.6hoursofoverflowprotection.Theanticipatedremedialresponsetimeislessthananhour.

PumpRedundancy

TheexistingLiftStationhasaredundantpumpsystemthatconsistsof3pumpslocatedinthepumpvault.Thepeakinflowof286gallonsperminuteonlyrequires2pumpstobeactiveduringpeakinflows.Thecontrolscyclethepumpusagetodistributetheoperatingtimeamongthepumps.

BackupPower

TheexistingLiftStationhasadieselfuelgeneratorwithanautomatictransferswitchtoactivatethegenerator.Thegeneratorcurrentlyonlyprovidesenoughpowertorun2ofthe3pumpsatatime.Thegeneratorisbeingupgradedasapartoftheprojecttoanaturalgasgeneratorthatcanprovideenoughpowertorunall3pumpsatonceincaseofanemergency.

AlarmSystem

TheLiftStationcurrentlyhas2alarmsystemsthataretriggeredpriortofillingemergencyoverflowstorage.

ForceMainDifferentialFlowMeasurement

TheexistingforcemainexitingtheLiftStationdoesnothaveflowmeteringontheinletandoutlettoprovidedifferentialflowmeasurement.PertheCherryCreekReservoirWatershedSiteApplicationReviewProcessEmergencyResponsePlanCriteria,differentialflowmeasurementshallbeprovidedontheforcemains.

Emergency Preparedness:

AnemergencyresponseplanisbeingdevelopedfortheLiftStation,butCWSDisnotpreparedtosharethedocumentsinceithasnotbeenadoptedbyitsboard.ThefollowingisalistofinformationthatshallbeprovidedintheEmergencyResponsePlanasidentifiedintheCherryCreekReservoirWatershedSiteApplicationReviewProcessEmergencyResponsePlanCriteria:


Estimatedtimetooverflowatpeakflow,intheeventofacriticalfailurethatmakestheliftstationinoperable.

Estimatedremedialresponsetime. Firstresponsepersonnelwithchain‐of‐commandandprioritizednotificationprocedure

(addressbothdayandafterhours).Identifyfirstresponseservicevendors,ifany(e.g.pumpingandtankproviders).

Prioritizednotificationprocessforotheraffectedentities(ColoradoDepartmentofPublicHealthandEnvironment;Tri‐CountyHealthDepartment;CherryCreekBasinWaterQualityAuthority;andaffecteddownstreamentitiessuchasdrinkingwatersystems,CherryCreekStatePark,DivisionofWildlife,etc.Identifypublicinformationprocedures.

WrittenStandardOperatingProcedures(SOPs)forrespondingpersonnelandauthoritytoact.Addressincomingflowsifequipmentisdownforextendedperiodoftime.

Availabilityandaccessibilityoffacilityplansandmaps. Identificationofagreementswithotheragencies(e.g.,forequipment,hauling,receiving,and

monitoring). Trainingrequirementsforoperationandmaintenancestaffandfirstresponsestaff. ProceduresandscheduleforupdatingEmergencyResponsePlan.

Findings:

LREbelievesthattheoutstandingitemsfortheSiteApplicationcanbeaddressedbyprovidingcommentstotheColoradoDepartmentofPublicHealthandEnvironment.

Duetothenatureofthesecomments,werecommendaconditionalapprovaloftheSiteApplicationdependentuponvalveexercisingbeingaddedtothemaintenanceplan,differentialflowmonitoringbeingaddedtotheforcemain,andtheEmergencyResponsePlanincludingtheinformationrequiredbytheCherryCreekReservoirWatershedSiteApplicationReviewProcessEmergencyResponsePlanCriteriaandsubmittedtoAuthoritytoreview.

Shouldyouhaveanyquestions,pleasedonothesitatetocontactus.

Sincerely,LEONARDRICEENGINEERS,INC.ChrisMuller,P.E.,P.M.P.SeniorProjectEngineerProjectNumber:1357CCB06cc: ChuckReid

^̀

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anna

StE Costilla Ave

¬«88Havana Lift Station

²February 2015

0 250 500

Feet

ELBERTDOUGLAS

EL PASO

ARAPAHOE

TELLER

This product is for reference purposes only and is not to be construed as a legal document or survey instrument.

HAVANNA LIFT STATIONProjectLocation

Latitude: 39º 35' 39.99" NLongitude: 104º 52' 1.52" W

TAC Motion Memorandum

To: CCBWQA TAC Members From: William P. Ruzzo, PE, LLC Date: March 2, 2015 Subject: Legislative Support for Regional Stormwater Detention Background The State Engineer’s Office (SEO) of the Colorado Division of Water Resources (DWR) has recently determined that regional storm water detention constitutes a diversion of water that is subject to water rights administration and that these facilities do not fall within the scope of the May 21, 2011 Administrative Approach for Storm Water Management. Previously, the DWR has allowed storm water management including detention and infiltration on individual sites provided those practices conform to the May 21, 2011 DWR memorandum. Issues Subjecting regional storm water management facilities to water rights administration by the State Engineer will require that storm water management agencies obtain for each such facility a water court decree for a "plan for augmentation" or other form of water court decree. The process for obtaining a water court decree is an adversarial, expensive, and time-consuming, process, with no guarantee of success. If the MS4’s within the Cherry Creek watershed are required to spend resources to obtain a water court decree for regional detention and infiltration facilities, there will be a significant delay in implementation of control measures that protect water quality of Cherry Creek and Cherry Creek Reservoir. Water Quality Nexus Regional1 storm water detention and infiltration, when designed for storm water quality and in conjunction with other watershed measures that include discharge limits on wastewater treatment plants, construction and post construction best management practices, and stream reclamation, improve quality of storm water that discharges to Cherry Creek Reservoir, based on in-stream nutrient data collected by the Authority. Potential TAC Motion

The TAC recommends the Authority Board support UDFCD in its pursuit of legislation to clarify that water rights impacts from storm water detention and infiltration facilities, both on individual sites and regionally, as de Minimis and protecting them from curtailment by the DWR and from lawsuits by water rights holders.

1 Control Regulation No. 72 Statement of Basis and Purpose (p.43) supports the use of regional facilities for stormwater treatment:

“…additional requirements for control of phosphorus in Cherry Creek Reservoir, which go beyond those in Regulation 61, may be addressed through regional facilities located after the stormwater has discharged into state waters, but prior to discharge into Cherry Creek Reservoir”. The Authority’s support of regional facilities was expressed in Control Regulation 5 CCR 1002‐72 Stormwater Permit Requirements Guidance Document, April 27, 2011. Whereas the definition of a “regional” stormwater facility can vary between agencies, regional water quality facility can be defined as a detention or infiltration facility that treats stormwater runoff from development or redevelopment before or after runoff is discharged to “waters of the state”.

February27,2015Mr.RickGoncalvesChairman,TechnicalAdvisoryCommitteeCherryCreekBasinWaterQualityAuthority8390EastCrescentParkway,Suite500GreenwoodVillage,CO80111RE: RepublicParkLiftStationSiteApplicationforCastlewoodWaterandSanitationDistrictDearMr.Goncalves,OnbehalfoftheCherryCreekBasinWaterQualityAuthority(Authority),LeonardRiceEngineers,Inc.(LRE)hasreviewedtheRepublicParkLiftStation(LiftStation)SiteApplicationaspreparedbyMerrick&Company(Engineer).TheownerandapplicantfortheLiftStationisCastlewoodWaterandSanitationDistrict(CWSD)(Applicant)(Owner).LRE'sreviewwasforcompletenessandcompliancewiththeAuthority’sapplicableregulations,policies,andguidancedocuments.

Project Background:

TheSiteApplicationwassubmittedbytheApplicanttotheAuthorityonJanuary27,2015.TheSiteApplicationproposedaddinganemergencyundergroundstoragevaulttotheexistingRepublicParkLiftStation.TheemergencyundergroundstoragevaultwouldreplacethemanholeupstreamoftheLiftStation.NomodificationsareproposedtotheexistingLiftStation.TheproposeddesignusesaweirpipethatwillconveypeakflowstotheliftstationandalsoprovideadischargepointtofilltheemergencystoragevaultintheeventofafailureattheLiftStation.TheadditionalemergencystoragevaultwillincreasetheemergencystoragefortheLiftStationfrom4minutesatpeakinflowtooveranhouratpeakinflow.TheLiftStationservesanareathathasreached100%buildoutandtheemergencystorageissizedfor100%buildout.

Guidance Documents and Scope of the Review:

TheSiteApplicationwasreviewedagainstthefollowingapplicableguidancedocuments:

RegulationNo.22,“RegulationforSiteApplicationProcess”(September2009)

RegulationNo.72,“CherryCreekReservoirControlRegulation”(November2012)

WaterPollutionControlProgramPolicyNo.WPC‐DR‐1,“ColoradoDesignCriteriaforDomesticWastewaterTreatmentWorks”(September2012)

CherryCreekBasinWaterQualityAuthority,“CherryCreekReservoirWatershedSiteApplicationReviewProcessEmergencyResponsePlanCriteria”(March28,2002)

ThepurposeandscopeofLRE’sreviewissummarizedasfollows:


ProvideareviewoftheSiteApplicationandEmergencyResponsePlan,relativetotherequirementsandresponsibilitiesoftheAuthority.

ProvideopinionsonthethoroughnessandcompletenessoftheEmergencyResponsePlan.

ProvideopinionsonwhethertheEmergencyResponsePlanandSiteApplicationmeetthecriteriaasdefinedbytheAuthority.

TheColoradoDepartmentofPublicHealthandEnvironment’sWaterQualityControlDivision(Division)isthetechnicalreviewerforSiteApplications.TheDivisionisultimatelyresponsibleforreviewingthetechnicalcompletenessandcorrectnessofthesubmittal.

Comments:

ProvidedbelowareourcommentsrelativetotheAuthority’sconcerns:

Location:

TheLiftStationislocatednearthewestendofEastCostillaAvenue(seeattachedmap).TheFloodInsuranceRateMap(FIRM)providedshowsthesitelocatedinZoneX(minimalfloodhazard).ThenearestwaterordrainagewayareheadwatersofLittleDryCreekthatarelocated0.08milesfromtheLiftStation.TherearenocommentsregardingthelocationoftheLiftStation.

General Design:

TheproposeddesignwillnotmakeanymodificationstotheexistingLiftStation.Theproposeddesignwillreplaceanupstreammanholewithanundergroundstoragevault.Pipinginthevaultwillconnecttheinflowpipesfromthesoutheastandthewesttotheoutflowpipe.ThetophalfofasectionoftheinflowlinewillberemovedtoactasaweirandallowwastewatertofilltheemergencystorageincaseofafailureattheLiftStation.ThesectionofweirpipewillallowforaverageandpeakflowstobeconveyedtotheLiftStationwithoutdischargingintotheemergencystoragevault.Avacuumtruckorpumpwillberequiredtoremovethewastewaterfromtheoverflowvault.Therearenocommentsregardingthegeneraldesignoftheimprovements.

Identification of Potential Overflow Causes:

Nocomments.

Operation and Maintenance Practices to Prevent Occurrence and Effects of Sanitary Sewer Overflows:

CWSDcontractstheoperationandmaintenanceoftheLiftStationtoanoutsideagency.Aplanisinplacefortheoperatortovisitthesiteonceaweektoinspecttheliftstation,testalarms,exercisevalves,andtestthebackuppowergenerator.Therearenocommentsregardingtheoperationandmaintenanceofthefacility.


Engineering Features to Address Sanitary Sewer Overflows:

OverflowProtection

TheexistingLiftStationhas4minutesofemergencystorageatthepeakinflowof92gallonsperminute.Theproposedemergencystoragevaultwillincreasetheemergencystoragetooveranhouratpeakinflow.Theanticipatedremedialresponsetimeislessthananhour.

PumpRedundancy

TheexistingLiftStationhasaredundantpumpsystemthatconsistsof2pumps.Eachpumphasapumpingcapacityof285gallonsperminute,exceedingthepeakinflowrateof92gallonsperminute.Thecontrolscyclethepumpusagetodistributetheoperatingtimeamongthepumps.

BackupPower

TheexistingLiftStationhasanaturalgasgeneratoronsitewithanautomatictransferswitch.

AlarmSystem

TheLiftStationcurrentlyhasanalarmsystemthatistriggeredpriortofillingemergencyoverflowstorage.

ForceMainDifferentialFlowMeasurement

TheexistingforcemainexitingtheLiftStationdoesnothaveflowmeteringoneithertheinletoroutlettoprovidedifferentialflowmeasurement.PertheCherryCreekReservoirWatershedSiteApplicationReviewProcessEmergencyResponsePlanCriteria,differentialflowmeasurementshallbeprovidedontheforcemains.

Emergency Preparedness:

AnEmergencyResponsePlanisbeingdevelopedfortheLiftStation,butCWSDisnotpreparedtosharethedocumentsinceithasnotbeenadoptedbyitsboard.ThefollowingisalistofinformationthatshallbeprovidedintheEmergencyResponsePlanasidentifiedintheCherryCreekReservoirWatershedSiteApplicationReviewProcessEmergencyResponsePlanCriteria:

Estimatedtimetooverflowatpeakflow,intheeventofacriticalfailurethatmakestheliftstationinoperable.

Estimatedremedialresponsetime. Firstresponsepersonnelwithchain‐of‐commandandprioritizednotificationprocedure

(addressbothdayandafterhours).Identifyfirstresponseservicevendors,ifany(e.g.pumpingandtankproviders).

Prioritizednotificationprocessforotheraffectedentities(ColoradoDepartmentofPublicHealthandEnvironment;Tri‐CountyHealthDepartment;CherryCreekBasinWaterQualityAuthority;andaffecteddownstreamentitiessuchasdrinkingwatersystems,CherryCreekStatePark,DivisionofWildlife,etc.Identifypublicinformationprocedures.


WrittenStandardOperatingProcedures(SOPs)forrespondingpersonnelandauthoritytoact.Addressincomingflowsifequipmentisdownforextendedperiodoftime.

Availabilityandaccessibilityoffacilityplansandmaps. Identificationofagreementswithotheragencies(e.g.,forequipment,hauling,receiving,and

monitoring). Trainingrequirementsforoperationandmaintenancestaffandfirstresponsestaff. ProceduresandscheduleforupdatingEmergencyResponsePlan.

Findings:

LREbelievesthattheoutstandingitemsfortheSiteApplicationcanbeaddressedbyprovidingcommentstotheColoradoDepartmentofPublicHealthandEnvironment.

Duetothenatureofthesecomments,werecommendaconditionalapprovaloftheSiteApplicationdependentupondifferentialflowmonitoringbeingaddedtotheforcemainandtheEmergencyResponsePlanincludingtheinformationrequiredbytheCherryCreekReservoirWatershedSiteApplicationReviewProcessEmergencyResponsePlanCriteriaandsubmittedtotheAuthorityforreview.

Shouldyouhaveanyquestions,pleasedonothesitatetocontactus.

Sincerely,LEONARDRICEENGINEERS,INC.ChrisMuller,P.E.,P.M.P.SeniorProjectEngineerProjectNumber:1357CCB06cc: ChuckReid

^̀

S Clin

ton St

E Costilla Ave

§̈¦25

Republic Park Lift Station

²February 2015

0 250 500

Feet

ELBERTDOUGLAS

EL PASO

ARAPAHOE

TELLER

This product is for reference purposes only and is not to be construed as a legal document or survey instrument.

REPUBLIC PARKLIFT STATION

ProjectLocation

Latitude: 39º 35' 28.66" NLongitude: 104º 52' 51.11" W

(excerpt from GEI 2015 Reservoir and Stream Monitoring, Analysis, & Reporting Proposal, Optional Study C): “C. Reservoir Sediment Study

GEI also recommends that a more comprehensive sediment study be scoped in early 2015 with input from Hydros, to better characterize sediment conditions in the Reservoir. These data would help inform the modeling of sediment internal nutrient loading component of the reservoir model as well as help guide future management strategies for the Reservoir. This study may include the fractionation of iron-bound phosphorus, aluminum-bound phosphorus, and calcium-bound phosphorus to characterize the bioavailable phosphorus content in the sediment. In addition, a laboratory nutrient release rate study under anoxic conditions would document the potential release rate of bioavailable nutrients (SRP and DIN) that facilitate algae growth during the summer. If this optional service is approved by the Authority, this task would fully scoped and cost estimated for labor and direct expenses at that time.”

CHERRY CREEK BASIN WATER QUALITY AUTHORITY 2015 Capital Project and Maintenance Status Report

February 23, 2015

1. Cherry Creek Stream Reclamation at Norton Farms (CCB 5.11) a. Description: Final design and construction of stream reclamation at Parker’s Norton Farms Open Space

Park in partnership with Town of Parker and UDFCD. b. Status: Board approved $30,000 for design and signed IGA with UDFCD and Parker on 05/16/13. Board

approved $225,000 for construction on September 18, 2014 and signed IGA Amendment with UDFCD and Parker.

c. Action Items: Project final design is moving forward. 53 Corporation was selected as the project contractor. Value engineering of the project is currently in progress with construction proposed in 2015.

2. Cherry Creek Stream Reclamation – CCSP to EcoPark (aka: Arapahoe Rd, CCB 5.14) a. Description: Preliminary design of stream reclamation in partnership with SEMSWA, UDFCD, Aurora,

and Arapahoe County. Project extends from Cherry State Park boundary to Eco-Park (Reaches 2 - 5). b. Status: Board approved $25,000 for design funding on 12/20/12 which provided $150,000 for final

design. Preliminary Design Report completed. Board approved $500,000 IGA amendment for construction on 10/17/13. Board approved $250,000 IGA amendment for construction on 5/21/14. UDFCD is project lead agency on Reach 5; SEMSWA is project lead agency on Reach 2. Reach 5 - Drop Structure #14 - construction started in June w/ Edge Construction. Construction is complete on Drop Structure 14; the final walk-thru was performed on 11/6/14.

c. Action Items: Assist project partners with engineering planning, design and construction. i. Reach 5 - ECI Construction, the Cherry Creek @ Eco Park contractor, was selected as the project

contractor. Construction is proposed to start in late summer of 2015.

ii. Reach 2 - CH2MHill was selected as the Engineer for this project. Design continues on the project with construction anticipated to start in 2016.

3. Cherry Creek Stream Reclamation – Country Meadows (aka: D/S of Hess Road, CCB 5.15) a. Description: Design of stream reclamation in partnership with Parker, Douglas County, and UDFCD. b. Status: Board approved design funds of $20,000 and entered into IGA w/UDFCD, Douglas County, Town

of Parker on 12/16/10. UDFCD signed contract with consultant on 06/03/11. Project team scaled back project due to lack of water quality benefits of one side-channel. Board approved construction funds of $500,000 on 03/15/12. Project has been delayed, due to cultural survey requirements for 404-permit.

c. Action Items: Resolution on cultural requirements is completed. Naranjo Civil was selected as the contractor; construction started on October 20, 2014. The project extends 150 calendar days. Project is approximately 75% complete. Assist project partners with construction phase coordination.

4. Piney Creek Stream Reclamation - at Caley Avenue (CCB 6.5) a. Description: Design of the stream reclamation in partnership with UDFCD and SEMSWA. b. Status: CH2MHill was selected as the Engineer for the Piney Creek Reach 7 project. UDFCD, under a

separate contract hired Stanley Consultants to perform a geomorphic study for Piney Creek upstream of Buckley Road to better understand the sediment transport through Piney Creek. Their initial draft report was dated October 9, 2014 and final draft on December 22, 2014. The Geomorphic report will assist the project team in understanding sediment transport through this reach of the stream. Board approved $50,000 IGA amendment for project design on 8/21/14. Preliminary design continues on the project with construction anticipated to start in the fall of 2015. An easement hold-out has signed, providing opportunity for Reach 6 projects to move forward.

c. Action Items: Assist project partners with engineering design & construction. Project partners are meeting to determine the best approach to stabilize the most critical sections of Reach 6 and 7 in a logical sequence based on funds available. Project approach combines details from Stantec's stream reclamation geomorphic approach with CH2M Hill's hydraulic analysis / traditional stream design approach. Additional sources of potential funding are being identified and contacted for grant assistance. Kick-off meetings have been conducted for all three phases. All projects are being designed to the fifty percent level, at which time the project sponsors will review the best approach to proceed with available funding. Sediment samples have been taken along Piney Creek and sent to ACZ Laboratories for total phosphorus testing.

MAINTENANCE

1. Reservoir De-stratification Operations (OM-7) a. Description: Routine operations and maintenance of aeration distribution system and compressor. b. Status: Board directed staff to prepare an O&M manual for 2013. The 2013 Eaton Report on the

destratification system recommended an exposed section of HDPE pipe be replaced. The aeration system stopped operating on 10/22/13 due to motor failure. Board approved funds to replace the compressor motor on 12/19/13. The motor and 16,000 hour service parts were installed on 04/16/14 and 04/17/14. The exposed section of HDPE pipe was replaced on 04/10/14. Piping in the manholes was modified on 06/11/14 so that the compressor can be exercised weekly without any air entering the underwater destratification mixing system. Exercising the compressor was performed during the 2014 aeration season. With change of manager's at the Marina, the aeration system parts currently stored at the off-site boat storage yard have been moved to the compressor building.

c. Action Items: Review and finalize the final O&M Manual; currently on hold. The aeration system will not be turned on in 2015. A 2015 Maintenance Plan is proposed and in the TAC March meeting packet.

2. PRF Weed Control (OM 14.1) a. Description: Weed control at PRFs within Cherry Creek State Park who contracts with weed-control

company (VMI) and Authority pays VMI directly for related work. b. Status: Mowing and chemical application work completed for 2014. c. Action Items: Begin planning activities for 2015.

3. PRF Reseeding at CCSP (OM 14.2) a. Description: Routine restoration of PRF vegetation at Cherry Creek State Park. b. Status: On hold c. Action items: Investigate requirements in spring 2015.

Cherry Creek Reservoir Sampling Site Maps

2015 Water Year TAC Summary Report

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Cherry Creek Reservoir CCR-2 Water Quality Conditions 2015 Water Year

TAC Summary Report

CCR-2 Secchi Depth 2015 Water Year CCR-2 Chlorophyll-a 2015 Water Year

CCR-2 Temperature 2015 Water Year CCR-2 Dissolved Oxygen 2015 Water Year

CCR-2 Total Phosphorus 2015 Water Year CCR-2 Soluble Reactive Phosphorus 2015 Water Year

CCR-2 Total Nitrogen 2015 Water Year CCR-2 Dissolved Inorganic Nitrogen 2015 Water Year

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TAC Summary Report

CC-10 Total Phosphorus and Soluble Reactive Phosphorus CT-2 Total Phosphorus and Soluble Reactive Phosphorus

CC-10 Total Nitrogen and Dissolved Inorganic Nitrogen CT-2 Total Nitrogen and Dissolved Inorganic Nitrogen

McMurdo Gulch

Water Quality Conditions 2015 Water Year TAC Summary Report

MCM-1 Total Phosphorus and Soluble Reactive Phosphorous

MCM-2 Total Phosphorus and Soluble Reactive Phosphorous

MCM-1 Total Nitrogen and Dissolved Inorganic Nitrogen

MCM-2 Total Nitrogen and Dissolved Inorganic Nitrogen

REGULATORY UPDATE MARCH 2015

How Might This Affect Mission?

Water Quality Standards Rulemaking Hearing NEW: Public-noticed proposals are available.

We should review proposals for potential impacts to water quality.

Graywater Control Regulation Rulemaking Hearing NEW: Comment dates

We should ensure the regulation is consistent with Regulation 72 nutrient requirements

Draft Contaminant Candidate List 4 NEW: EPA is requesting comments on draft list

We should be aware of the constituents on the list that may have an impact on the Authority’s mission.

Improve, protect, and preserve water quality….

REGULATORY UPDATE FOR THE CHERRY CREEK BASIN WATER QUALITY AUTHORITY

PREPARED BY LEONARD RICE ENGINEERS, INC.

Water Quality Standards Rulemaking Hearing

(Regulation 38)

1. There will be a Rulemaking Hearing on June 8, 2015 to consider revisions to the water quality standards for the South Platte Basin.

2. Twenty-one proposals were received from entities (“Proponents”) that are requesting changes to the standards. These proposals have been public noticed at: ftp://ft.dphe.state.co.us/wqc/wqcc/38TriennialReviewRMH_2015/38Notice.pdf

3. With respect to the Cherry Creek watershed, the following proposals have been made: The Water Quality Control Division has proposed additional water supply standards for cadmium,

chromium III, lead, and nickel and an agricultural standard for molybdenum. These standards would apply to the reservoir, Cherry Creek, all tributaries, and upstream lakes and reservoirs. In addition, a water supply classification would be added for all tributaries and upstream lakes and reservoirs, with additional water supply standards for chloride, sulfate, arsenic, iron and manganese. The use protection classification for tributaries would also be removed. The Division has also proposed standards for chlorophyll a (150 mg/m2; this is a measure of algae coverage on rocks) and total phosphorus (170 ug/L) for Cherry Creek and tributaries, to be applied only in the “headwaters” which are defined as being above any of the wastewater treatment facilities specifically indentified in the proposed regulation.

Cottonwood Water & Sanitation District has proposed a new segment for Cottonwood Creek, with a use protection classification, site specific selenium standards and designated selenium compliance assessment locations.

Parker Water & Sanitation District has proposed a temporary modification to the copper standards on Cherry Creek downstream of the PWSD discharge.

4. Deadlines for various documents for this rulemaking process are listed below: March 11: Proponents Prehearing Statements are due. March 31: Party status requests are due. April 15: Responsive Prehearing Statements are due. May 13: Rebuttal Statements responding to the prehearing statements are due.

ftp://ft.dphe.state.co.us/wqc/wqcc/38TriennialReviewRMH_2015/38Notice.pdf

Graywater Control Regulation Rulemaking Hearing

(Regulation 86)

1. The Water Quality Control Commission will hold Rulemaking Heating on April 13, 2015 to consider the adoption of a control regulation for graywater.

2. The purpose of the regulation would be to describe requirements, prohibitions, and standards for the use of graywater for nondrinking water purposes, to encourage the use for graywater, and to protect public health and water quality. The regulation would establish the allowed users and allowed uses of graywater within the state and establish minimum statewide standards for location, design, construction, operation, installation, and modification of graywater treatment works. It would also establish minimum ordinance requirements for a city or county that chooses to authorize graywater use within its jurisdiction.

3. Allowed uses are subsurface landscape irrigation and toilet/urinal flushing under the proposal. Allowed sources under the proposal would be limited to bathroom and laundry sinks, bathtubs, showers, and laundry machines.

4. Parties from the Cherry Creek Basin include Tri-County Health Department, Douglas County, and Cottonwood and Inverness Water & Sanitation Districts.

5. A copy of the proposed regulation may be found at: ftp://ft.dphe.state.co.us/wqc/wqcc/61_86GraywaterRMH/61_86_Notice1504.pdf

6. Written comments should be received by the Colorado Department of Public Health and Environment by April 1, 2015. Electronic comments may be submitted until April 10, 2015 (see above link for written and electronic comment submission requirements).

ftp://ft.dphe.state.co.us/wqc/wqcc/61_86GraywaterRMH/61_86_Notice1504.pdf

EPA Draft Contaminant Candidate List February 4, 2015 Federal Register (2015-02210)

1. On February 4, 2015, EPA published for public review and comment a draft list of contaminants that are currently not subject to any proposed or promulgated national primary drinking water regulations. These contaminants are known or anticipated to occur in public water systems and may require regulation under the Safe Drinking Water Act (SDWA).

2. The SDWA requires EPA to publish a list every five years of currently unregulated contaminants that may pose risks for drinking water; the list is known as the Contaminant Candidate List (CCL). This list si subsequently used to make regulatory determinations whether to regulate these contaminants with the National Primary Drinking Water Regulations (NPDWR). For example, under the NPDWR, EPA could promulgate Maximum Contaminant Levels (MCLs) or require Treatment Techniques (TTs) to remove the contaminants. The CCL is the first step in evaluating which subset of contaminants may require MCLs ro TTs. It has been the Water Quality Control Commission’s practice to then include MCLs as water quality standards for waters that are designated as drinking water supplies.

3. This is the fourth time EPA has published a Contaminant Candidate List. The Draft CCL 4 List includes cyanotoxins as one of the listed contaminants. There are 100 chemicals and 12 microbes on the draft list. (Note that Microcystin-LR was originally proposed for inclusion on the list; this has been expanded to include all cyanotoxins.)

4. EPA is soliciting comments on the draft list. Any comments must be submitted by April 6, 2015.

5. For further information, see: http://www.regulations.gov/#!documentDetail;D=EPA-HQ-OW-2012-0217-0016

http://www.regulations.gov/%23!documentDetail;D=EPA-HQ-OW-2012-0217-0016

http://www.regulations.gov/%23!documentDetail;D=EPA-HQ-OW-2012-0217-0016

Upcoming 2015 Dates: April 13th = Reg. 86 Rulemaking Hearing

May 11th = Reg. 72 Informational Hearing June 8th = Reg. 38 Rulemaking Hearing

October 13th = Reg. 85 Informational Hearing December 14th = Reg. 93 Rulemaking Hearing

WQS (Chl a)

Monitoring

OWTS

Annual Reporting

Public Info/ Education MS4s

Graywater

WWTPs

Reg. 86 Future Graywater Stds.

Reg. 31 Statewide WQS

Reg. 38 Cherry Creek WQS

Reg. 43 OWTS

Reg. 61 Permits Reg. 85

Nutrients Reg. 22

Site Approval

Reg. 61 MS4 Permits

Reg. 85 Nutrients

Reg. 93 WQS

Assessment/ 303(d) List

Reg. 61 MS4 Permits

Reg. 85 Nutrients

Reg. 72 Cherry Creek

Reservoir Control

Regulation