Blackburn Wastewater Treatment Plant Upgrade Study

More documents

Recommendations

Info

City of Prince George <strong>Blackburn</strong> Sanitary Sewer InfltrationlInflow Studv - 1999 Prepad lor: City of Prince George Prepared by: Stantec Comdtiug Ltd. June, 1999
5.0 CONCLUSIONS I '\ -. 5.1 RESULTS OF STUDY The study Field investigations included the folfowing works: instaliing flow muen in nine manholes, installing peak level indicaturs in six manhoIes, visd investigations incIuding observing and estimating observed inflow to selected doles. visual observations depth bf now titcough selected manholes. Cornpatisons were made between p ro-h theoretical generated flows at the manholes equipped with flow mtm, as well as a comparison of observed inflow estimates to the recorded inflow (recorded flow less theoretical gcncrared flows). Although estimated observed inflows an only esdmates, it appears that estimated observed inflows amounted to only approximately 75% of the recorded inflow. The. additional 25% may be h m manholes which were not open4 or may be from leaking mains or service connections. The 1991 tefevision camen inspectiom indicate that some infiltrarion to piping. either crackad or bmken pipes or service connections. was observed at that time. Two observed conditions w m possible mediation activities. of &gnificaot interest in arsessin~infl~wf~ltration and On March Zth, bH OKSW was observed to have storm water from a backedvp ditch flowing dictly into the rim On March 26th. City crews ched out the ditch and diverted stormwater away from this manhole. Flow mettr No. 7, downsaeam. immediately recorded a drop in fIow of ;rppmxhtely 400 cu.d&y. This ilfusaatcs tbat signifiwnf inflow an occur from only a few manhoIes if the rims are below the bund bl or below stonnwarer kvels. either in ditches, creeks oc standing water - during evly spring snowmelt. On Mmh 25. MH EAK43A exhibited inflow from the cover - the rim was below ground kvel and had standins W r around ir. On April 9, the sunding water had d-cd to below the rim of the manhok, however, leakage was observed from the bax of the ma~~hok. A simh situation was observed at MJi NKSjD, where on March 25, there was inflow from the rim and bricking and on Aprii 7, there was inflow from the base. Observations at these NO Imtions indicate that, although the worn inflows appear to occur during the firsr snow-mlt, iflows also continue 3s the thaws. I9 c,lyotRinuetCorge Blrlburn Smiury Sever Infilmhdlnllwr Sm& ,7,".l R m m . llln 19V9
Page 2 and 3: BLACKBURN WASTEWATER TREATMENT PLAN
Page 4 and 5: Table of Contents SECTION TITLE PAG
Page 6 and 7: SECTION 1 STUDY BACKGROUND AND OBJE
Page 8 and 9: Section 1.0 -Project Background and
Page 14 and 15: Section 1.0 - Project Background an
Page 20 and 21: City of Prince George - Decision Wo
Page 22 and 23: City of Prince George - Decision Wo
Page 24 and 25: MINUTES OF MEETING PR~ECT NAME: Bla
Page 27 and 28: Blackburn WWTP Treatment Options Op
Page 29 and 30: Nores. Annual O&M cost for Blackbum
Page 31: Blackbum WWTP Treatment Options Opt
Page 35: APPENDIX A STANTEC CONSULTING LTD.
Page 39 and 40: CITY OF PRINCE GEORGE Forcemain fro
Page 41 and 42: Section 6.0 -Recommended Option Key
Page 43 and 44: Section 6.0 -Recommended Option Com
Page 45 and 46: SECTION 6.0 RECOMMENDED OPTION 6.1
Page 47 and 48: SECTION 5.0 EVALUATION OF OPTIONS 5
Page 49 and 50: Section 5.0 -Evaluation of Options
Page 55 and 56: Section 5.0 - Evahation of Options
Page 57 and 58: Section 3.0 - Evaluation of Options
Page 59 and 60: SECTION 4.0 BLACKBURN TREATMENT OPT
Page 61 and 62: Section 4.0 - Blackbum Treatment Op
Page 65 and 66: Section 4.0 - Blackburn Treatment O
Page 67 and 68: Initiate llt reduction program and
Page 69 and 70: Section 4.0 - Blackburn Treatment O
Page 71 and 72: Section 4.0 - Blackbm Treatment Opt
Page 77 and 78: CITY OF PRINCE GEORGE Scale= $:I00
Page 83 and 84: :ITY Of PRINCE GEORGE Existing Chlo
Page 87 and 88:
Section 4.0 - Blackbum Treatment Op
Page 89 and 90:
Page 91 and 92:
Section 4.0 - Blackburn Treatment O
Page 93 and 94:
SECTION 4.0 BLACKBURN TREATMENT OPT
Page 95 and 96:
Page 97 and 98:
Page 99 and 100:
Page 101 and 102:
Initiate Ill reduction program and
Page 103 and 104:
Page 105 and 106:
SECTION 3.0 AUDIT OF EXISTING FACIL
Page 107 and 108:
Section 3.0 -Audit of exist in^ Fac
Page 109 and 110:
Section 3.0 -Audit of Existing Faci
Page 111 and 112:
SECTION 2.0 III MITIGATION MEASURES
Page 113 and 114:
Section 2.0 - UI Mitigation Measure
Page 115 and 116:
APPENDIX E FLOW CALCULATIONS FOR SE
show all

Blackburn Wastewater Treatment Plant Upgrade Study

Create successful ePaper yourself

Delete template?

Save as template?