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Attachment A. Descri tion of Additional and Unantici ated Sco Items
<br /> A ri120041nvtrice Unbiiled Work (After A ril 2009
<br />Requested
<br /> Unbiiled 6Vork Unbiiled Work Unbiiled Work Budget
<br />Task/Description Additional WorkNnanticipated Ttems Contract Total Work Tata1Bi11ed Balance (Through Aprt ]a, (April 11 through (Projected for
<br />Amendment
<br /> Budget Performed 2009 Ma 15 2009 Future Tasks
<br />` ~ l Determine Current and Historical Water $2,p2p $2,544 $2,544 ($524) $0 $0 $0 $0
<br /> ualil Caodiiians (includin 2008 work
<br /> SetBeneftcialUseGoals $1,150 $1,152 $563 $588 $589 $0 $0 $589
<br /> 'Tools 3 Assess attainment or nonatlainmeol for $350 $366 $366 ($16} $0 $0 $0 $0
<br /> current watershed laud use conditions
<br /> Task 4 EsGmale annual storm water runoff and $18,345 $18,345 $18,345 $0 $0 $0 $0 $0
<br /> has hares bud et to the lake
<br /> Reconcile the hydrologic and phosphorus
<br />$0
<br />$0
<br />$0
<br />$0
<br /> Task S budgets to observed indake conditions using a -- $21,743 $21,956 $21,956 ($213)
<br /> lake water uaGt model
<br />
<br />Task 6 Using the lake model, assess likelihood of
<br />benefirial use attainment under ultimate
<br />$3,050
<br />$3,054
<br />$94
<br />$2,957
<br />$2,960
<br />$0
<br />$0
<br />$2,960
<br /> watershed load use conditions
<br />Task1 Recommend Feasible Alterne6ve Remedial $5,040 $5,097 $5,097 ($57) $0 $0 $0 $0
<br /> Measures
<br />
<br /> -Development and production of the January 2008 Technical Memo, January 2009 Draft Report, April 2009 Report, and
<br /> potentially a Future Report if there are changes requested as the result of the GLWMO review (Original scope only accounted
<br />T
<br />k 8 Generate the Lake Owasso For develo men( and roduction of draft and final re ort 870
<br />$i 6 I90
<br />$27 $I SA58 812
<br />$1 $12,132 $4,301 $920 $17,352
<br />as Diagoostic/Feasibiliiy Study Report , , ,
<br /> • Additional items to be discussed in the UAA report as the result of the calibration issues and Additional modeling required
<br /> - Pre aration of additional resentations and u date materials for unbud eted meetin s
<br /> - Un fanned meetin in the field with lake residents and RWMWD to look at direct dischar es to the lake
<br /> - Attendance of 9 GLWMO managers meeting per the manager s request for status updates (only 2 meetings with the managers
<br />T
<br />k 9 Project Management & Misc. Correspondence were outlined in the on 'nal ro'ect sco $8
<br />545 791
<br />$10 855
<br />$9 ($1,310) $936 $2,161 $1,760 $4,857
<br />as (ineludiag 2008) - Futtue Attendance of Ma 28, 2009 mans ers' worksho er the r nest of the GLWMO mono ers , , ,
<br /> - Attendance of 3 Lake Association meetings (including future attendance of the mid-Juno 2009 meeting) (only 2 meetings
<br /> with the Lake Association were outlined in the on inn] ro'ect sco e
<br /> 001 $0 $0 $0 $0 $0
<br />ask 10 CoaductLakeUserSurv -- $130(11 $13,001 $13,
<br /> -Additional work with RWMWD on establishment of the monitoring site locations and setting water quality sampling triggers
<br /> 2~I8 Monitoring at sites im acted b tailwater effects from Lake Owasso Court Road C and Dale Street $2,OD0 $2,833 $2,833 {$833) $0 $0 $D $0
<br /> - Additional work to address sam les collected with a " as" smell at West Owasso Blvd.
<br /> - ]sues with the mnoffvolume calibration -Extremely dry calibration years (2007 & 2008) with law water levels in all ponds
<br /> throughout the watershed (many ponds not discharging at various times throughout the summer). Infiltration (excessive
<br /> evaporation) terms needed to be added to ponds throughout the watershed to help calibrate the runoff volumes predicted by the
<br /> P8 model.
<br /> -Issues related to the runoff flow monitoring data at the Wesl Owasso Blvd site including baseflaw through this system and
<br /> issues with the flow monitoring data in mid-2007. It seems the 2007 flow monitoring issues could be the result of the shifting
<br /> of the monitorin ui men( duri the tar a storm events that occurred in mid-Au ust 2007.
<br /> - Issues related to the runoff flaw monitoring data at the County Road C (2007 & 2008) and Dale St (2008} sites including
<br /> flows impacted by tailwater effects from Lake Owasso, the need to develop specific rating curves at each site to account for
<br /> tailwater effects for use in the PS model
<br /> Validation/RecalibraGon o[ the Runoff and -Issues with the development of the Lake Owasso water balance including a variable discharge rating curve as the result of ice
<br />Task 12 Pollutant Loading Model using 2008 build up and the timing of ice-on and ice-off and variable groundwater exchange, both seasonally as well as annually $7,265 $18,051 $9,726 ($2,461) $8.325 $0 $D $8,325
<br /> ito
<br />i
<br />data
<br /> mon
<br />r
<br />ng -Limited runoff water quality data at County Road C in both 2007 & 2008 as the result of tailwater effecEs from Lake
<br /> Owasso (issues with water quality sampling triggers, limited number of samples collected far composite) and low water levels
<br /> and therefore no dischar a Burin the summer.
<br /> • Internal loading in the County Road C wetland determined based on grab samples collected between storm events in 2008
<br /> - FLUX modeling performed to better understand actual water and phosphorus loads at each monitoring station (Galtier St.,
<br /> West Owasso Blvd, County Road C, and Dale StJ and to help quantify the internal loading occurring in the water bodies
<br /> within the watershed.
<br /> - Development of a phosphorus mass balance model to develop the estimate infernal loads from watershed wafer bodies that
<br /> n eeded to be routed to Lake Owasso inthe in-lake water quality model. This mass balance mode] needed to be applied to all
<br /> c limatic conditions as well as al] BMP scenarios that evaluated chart es in the watershed loads.
<br /> • Unforeseen modifications to the in-lake water quality model ware required to reflect the conditions at Lake Owasso
<br />1 YalidationlRecalibration ofthe in•Lake Water includin toe loco ration of the watershed internal loadin $7
<br />130 $14
<br />1 l5 073
<br />$1 $57 $7,042 $0 $0 $7,042
<br />Task
<br />3 Quality Model using 2008 Data . The phosphorus mass balance model needed to be applied to all climatic conditions as well as all BMP scenarios that , , ,
<br /> e valuated chart es in the watershed loads to be used as in uts to the in-lake water unlit model.
<br />TOTAL $]06510 $138,494.. _ __ $106 10 $0 $31,984 $6,462 $2 680 $41125
<br />Projected costs for any updates and reproduction of the final draft of the UAA report if commems or changes are requested.
<br />Projected costs for the preparation and attendance of the CLWA70 workshop meeting on May 28, 2009 and the lake Association meeting in mid-Jana 2009
<br />
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