STRATFORD PLATT STREET PUMP STATION STUDY REPORT

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L ANDENGINEEREDST RUC T URESS OLUTION SWATEROctober 3, 2012Mr. Brian Snyder, AIA, LEED AP, CDTSenior AssociateThe Geddis Partnership Architects71 Old Post Road - Suite 101PO Box 1020Southport, CT 06890SUBJECT:Stratford Platt Street Pump StationDTC Study ReportDTC Project No. 12-402-000Dear Brian:We have completed our assessment of the Stormwater Pump Station at the end of Platt Street. Thefollowing outlines our review of existing conditions, and our recommendations for improvements:BackgroundThe Town of Stratford owns and maintains a stormwater lift station located east of the end of PlattStreet. This station was constructed in the 1970's to help to provide flood relief for the currentAshcroft factory property, as well as the existing East Main Street Railroad underpass. The stationconsists of a 9'-2" x 16'-6" x 16'-6" high concrete structure built into an earthen berm separating tidaland non-tidal areas. The station is equipped with two 7.5 HP vertical shaft pumps, pump controller,and a still well housing pump float switches. The station pump controller is located in the belowgrade motor platform. The elevation of the existing pump motors, motor controls, and electricalpanel put them at risk of tidal inundation for storms in excess of the 1O year tidal event. The stationelectrical service is provided via an overhead and underground electrical service originating at andexisting utility pole at the end of Platt Street. A 48" RCP is present to convey gravity low level flows,and to feed stormwater to the pump station wet well. The 48" pipe is equipped with a flap type tidegate on the tidal side of the station to protect against tidal inflow, and a bar rack to screen inlandflows prior to reaching the lift station. The station wet well is provided with a metal bar screen tofurther limit debris from effecting the pump operation. The pump discharges are via two 1O"discharge lines through the pump station wall and equipped with flap type tide gates. The pumpstation is capped with a steel I-beam roof structure, plate steel decking, and a hinged steel cover.The entire structure is surrounded by a six foot high chain link fence with barbed wire cap.Information contained in this document is proprietary and confidential and may not be disseminated to any party other than the intended recipientwithout the written consent of Diversified Technology Consultants.2321WHIT NEYA V EN U E SUITE2 03 2 39 4 2 00 PH301HAMDEN20 3 2 34 73 7 6 FA XCT 0 6518*590520*SEMS Doc ID 590520

Stratford Platt Street Pump Station StudyMr. Brian Snyder, AssociateOctober 3, 2012Page 2 of412-402-108Existing Condition AssessmentA visual inspection of the existing station was performed to assess potential station improvements. The existing electrical underground service has been compromised and is the likely cause ofa significant electrical short observed in the pump controller. Since power and pump controls are non functional the operational condition of the existingpump motors can not be properly assessed. Similarly, the condition and function of the existing float controls can not be properlyevaluated. The existing flap gates on the 48" pipe and the pump discharge lines are in need ofreplacement. The existing steel roof structure, roof plates, and access hatch are all severely corroded andrequire refinishing, repair and/or replacement. The existing wet well bar screen is in need of refinishing. The existing chain link fence is rusted and should be repaired and refinished or replaced. The 48" inlet bar screen is covered in debris affecting its inlet capacity.Recommended ImprovementsAfter review, we have developed the following station improvement options:Full Station UpgradeUnder this option, the entire station would be rehabilitated to current standards. This optionimproves station efficiency, improves station security, and provides a higher level of protection fromflooding impacts on the station itself. Improvements under this option include: Remove existing fence and metal roof system .Remove existing pumps, motor controls, electrical panel, and level controlsRemove existing motor level concrete deck.Install new underground electrical service from Platt Street to station (including replacementof existing overhead line to utility pole in ROW)Install new submersible pumps, slide rail system, and discharge lines. Proposed pumpswould be sized to match the pumping capacity of the existing pumps.Install new standpipe and new pressure transducer for level monitoringInstall a new concrete slab top on the existing station. Include new locking metal hatches inthe new concrete top section.Install new surface mount heavy duty stainless steel electrical and control cabinet.Install new pump controls and electrical service panelClean and paint existing bar screen system and reinstall .Install new "duckbill" type rubber tide gates on the 48" discharge pipe (already beingprocured by the Town), and the pump discharge lines.Information contained in this document is proprietary and confidential and may not be disseminated to any pa,ty other than the intended recipientwithout the written consent of Diversified Technology Consultants.2321WHITNEYAVENUESUITE203 239 4200 Ph301HAMDEN203 234 7376 FaxCT 06518

Stratford Platt Street Pump Station StudyMr. Brian Snyder, AssociateOctober 3, 2012Page 3of412-402-108A conceptual level cost for these improvements is approximately 75,000- 85,000Partial Station UpgradeUnder this option, only minimal improvements would be made to the station; primarily intended torestore functionality to the station operation. Improvements under this option include: Repair and repaint existing fence and gateRepair, replace, and/or refurbish the existing station metal roof system. Resurface existingsteel roof structural members.Replace existing station top hatch with a new light duty metal hatch.Remove existing motor controls, electrical panel, and level controlsRemove existing pumps and return to the manufacturer for evaluation and possiblerefurbishmentInstall new underground electrical service from the existing utility pole in the ROW to thestation (assumes existing overhead line to utility pole in ROW to remain)Install new pressure transducer for level monitoring in existing standpipeInstall new surface mount heavy duty stainless steel electrical and control cabinet.Install new pump controls and electrical service panelClean and paint existing bar screen system and reinstall.Install new "duckbill" type rubber tide gates on the 48" discharge pipe {already beingprocured by the Town), and the pump discharge lines.A conceptual level cost for these improvements is approximately 30,000- 40,000Existing Station CapacityThe drainage area draining to the existing station has been delineated and field reviewed. Basedon this assessment, the overall drainage area is estimated at approximately 105 acres. Anassessment of drainage area coverage conditions, and flow times of concentration was also made.Overall, stormwater flows to the existing station are orders of magnitude greater than the pumpingcapacity (estimated at less than 5 CFS) of the station during elevated tidal conditions. In order toremedy this situation, the existing pump station would need to be replaced in its entirety with astation with greatly increased capacity. To provide protection to low lying areas including theAshcroft parking area and the East Main Street underpass for a 10 year inland storm and tidal levelsexceeding the High Tide Line (HTL 4.0 NGVD-29), station capacity would need to be on the orderof 40-50 CFS. Cost for a station of this size would easily top 500,000. It may be possible to diverta portion of the drainage area away from the new station in order to decrease pumped flows, thusreducing the station size and cost. This option is outside the overall scope of this study, but wouldbe worth pursuing if increasing station capacity is being considered .Information contained in this document is proprietary and confidential and may not be disseminated to any party other than the intended recipientwithout the written consent of Diversified Technology Consultants.2321WHITNEYAVENUESUITE203 239 4200 Ph301HAMDEN203 234 7376 FaxCT 06518

NORTHGRAPHIC SCALED I V E R S I F I E D TE C H N O L O G Y CO N S U L T A N T S2321 WHITNEY AVE HAMDEN CT 06518203 239 4200 203 234 7376 FAX( IN FEET )PLATT STREET PUMP STATIONDRAINAGE STUDYSTRATFORD, CONNECTICUTFIG.1DRAINAGE AREA MAPDRAWN BY:SRLCHECKED BY:JABSCALE:AS NOTEDDATE:10/03/2012DTC NUMBER:12-402-106

NORTHGRAPHIC SCALED I V E R S I F I E D TE C H N O L O G Y CO N S U L T A N T S2321 WHITNEY AVE HAMDEN CT 06518203 239 4200 203 234 7376 FAX( IN FEET )PLATT STREET PUMP STATIONDRAINAGE STUDYSTRATFORD, CONNECTICUTFIG.2UNDERGROUND ELECTRICLOCATION PLANDRAWN BY:SRLCHECKED BY:JABSCALE:AS NOTEDDATE:10/03/2012DTC NUMBER:12-402-106

PLATT STREET PUMP STATIONDRAINAGE STUDYD I V E R S I F I E D TE C H N O L O G Y CO N S U L T A N T S2321 WHITNEY AVE HAMDEN CT 06518203 239 4200 203 234 7376 FAXSTRATFORD, CONNECTICUTFIG.3EXISTING CONDITIONS PLANDRAWN BY:SRLCHECKED BY:JABSCALE:AS NOTEDDATE:10/03/2012DTC NUMBER:12-402-106

PLATT STREET PUMP STATIONDRAINAGE STUDYD I V E R S I F I E D TE C H N O L O G Y CO N S U L T A N T S2321 WHITNEY AVE HAMDEN CT 06518203 239 4200 203 234 7376 FAXSTRATFORD, CONNECTICUTFIG.4FULL STATION UPGRADEDEMOLITION PLANDRAWN BY:SRLCHECKED BY:JABSCALE:AS NOTEDDATE:10/03/2012DTC NUMBER:12-402-106

PLATT STREET PUMP STATIONDRAINAGE STUDYD I V E R S I F I E D TE C H N O L O G Y CO N S U L T A N T S2321 WHITNEY AVE HAMDEN CT 06518203 239 4200 203 234 7376 FAXSTRATFORD, CONNECTICUTFULL STATION UPGRADEPROPOSED STATIONIMPROVEMENTSFIG.5DRAWN BY:SRLCHECKED BY:JABSCALE:AS NOTEDDATE:10/03/2012DTC NUMBER:12-402-106

PLATT STREET PUMP STATIONDRAINAGE STUDYD I V E R S I F I E D TE C H N O L O G Y CO N S U L T A N T S2321 WHITNEY AVE HAMDEN CT 06518203 239 4200 203 234 7376 FAXSTRATFORD, CONNECTICUTFIG.6PARTIAL STATION UPGRADEIMPROVEMENTSDRAWN BY:SRLCHECKED BY:JABSCALE:AS NOTEDDATE:10/03/2012DTC NUMBER:12-402-106

Diversified Technology Consultants, Inc. Enclosure: Figures 1-6 . P:12012112402-Stratford Platt Street Pump Station\documents\Repons\20121003 Platt St Repon.doc : Information contained in this document is proprietary and confidential and may not be disseminated to any party other than the intended recipient

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