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Home My WebLink AboutWQ0037324_Flow Reduction Request_20210420 • • Michael C. Gallant PE, PA RECEIVED Engineering/Consulting/Design NC Firm C-1989,AL Firm CA-4338—E APR 2 0 2021 NC Reg.No.-25572,AL Reg.No.-32178 NCDEQIDWRIMPDES NC DEQ Division of Water Resources Municipal Unit 1611 Mail Service Center Raleigh, N.C. 27699-1611 Attn: Christyn Fertenbaugh, PE April 12, 2021 Re: Flow Reduction Request—Pluris Hampstead, LLC - Permit No. WQ0037324 Dear Christyn, Pluris Hampstead, LLC respectfully requests a collection system flow reduction for all residential tributary flows to the Pluris Hampstead WWTF. This request is based on the attached information and calculations. Please feel free to call or email me with any questions or issues regarding this request. Sincerely, A 4, Michael C. Gallant, PE • 0 Michael C. Gallant PE, PA Engineering/Consulting/Design NC Firm C-1989,AL Firm CA-4338—E NC Reg.No.-25572,AL Reg.No.-32178 PLURIS HAMPSTEAD FLOW REDUCTION STUDY - WQ0037324 Prepared by: Michael C. Gallant, PE N‘\N CARG 1-7• S L 02 72 , F IN * Q' .qL•�.............. I'H/llllllIt' � April 2, 2021 • O Michael C. Gallant PE, PA Engineering/Consulting/Design NC Firm C-1989,AL Firm CA-4338—E NC Reg.No.-25572,AL Reg.No.-32178 1. INTRODUCTION 1.1. The Pluris Hampstead WWTF was put into service in the first quarter of 2016. The plant serves an area that was previously unsewered. Since that time the flow has increased considerably and the area is currently experiencing rapid growth. The plant is located in eastern Pender County and primarily serves properties along the US Hwy 17 corridor. The system serves both residential and commercial connections. The system does not serve any industrial customers. All tributary flows are considered domestic wastewater. 1.2. This request is for a flow reduction for residential connections only. Commercial connections will continue to be allocated flow based on the current regulations (2T rules) depending on the nature of the use. 1.3. Despite this system being located in a coastal county there are no tributary flows from any barrier island communities. Any future service of a barrier island community would not be included in this flow reduction, and would reflect the typical rate of 120 gpd/bdrm as stated in the 2T rules. 1.4. Due to the relatively young age of the system and the large amount of force main lines compared to gravity lines in the system, inflow and infiltration are considered to be negligible. 2. FLOW MEASURMENT AND DATA SOURCING 2.1. The flow measuring devices that were used to provide the data for this study are electromagnetic flowmeters (Mag meters)operating in a full, closed pipe under pressurized flow conditions. These meters were last calibrated on December 19,2020. All flow and connection data was provided by Pluris Hampstead, LLC staff. Flow data corresponds to the data provided on the submitted daily monitoring reports (DMR's)for the facility. Connection data reflects the customer base and the requirements of the North Carolina Utilities Commission (NCUC). Please note that the number of connections for the last two months of the study period was reduced per the NCUC due to the fact that some connections represented one and two bedroom apartments. This reduction reduces the calculated number of bedrooms in the following analysis. The actual number of connections is greater than used in the analysis. This means that the number of bedrooms calculated would be less than what is being served. This discrepancy makes the calculations more conservative as the calculated flow per bedroom is based on dividing the residential flow by the total number of bedrooms. The lower the number of bedrooms is,the higher the flow per bedroom would be when calculated. 3. METHOD OF ANALYSIS 3.1. The method of analysis for this study is based on daily flows reported for the Pluris Hampstead WWTF on the submitted DMR's. Appendix A shows the average daily flow for the plant for each month from January 2020 through January 2021. The data also reflect the number of residential and commercial customers for those months and the flow from the commercial connections. The RESIDENTIAL FLOW COMPONENT • • o Michael C. Gallant PE, PA Engineering/Consulting/Design NC Firm C-1989,AL Firm CA-4338—E NC Reg.No.-25572,AL Reg.No.-32178 was calculated by subtracting the COMMERCIAL FLOW from the AVERAGE DAILY FLOW. 3.2. The peak month for the study period was January 2021. This is to be expected as the system is adding new customers on a daily basis. For this month the RESIDENTIAL FLOW COMPONENT was 96,107 gallons per day(158,609- 65,502=96,107). For this month the number of RESIDENTIAL CONNECTIONS was 744 and the number of COMMERCIAL CONNECTIONS was 70. Based on this data the percentage of the average daily flow due to the RESIDENTIOL FLOW COMPONENT was 61% (96,107/158,609). 3.3. The next step in the analysis involves the calculation of the total number of bedrooms for the month of January 2021, the peak flow month for the study period. Pluris Hampstead, LLC staff supplied the number of one bedroom and two bedroom apartments. In addition the system serves a 55 and over retirement community consisting of two bedroom modular units. The number of one bedroom and two bedroom bedroom apartments plus the number of two bedroom modular units was added up and subtracted from the total number of connections to yield the NUMBER OF CONNECTIONS ASSUMED TO BE 3 BEDROOMS ON AVERAGE(744—[72+114+101] =457). Note that some of these connections will have more than 3 bedrooms per unit but assuming a lower number makes the overall total of bedrooms in the system smaller thus making the flow per bedroom larger and more conservative. This analysis is reflected in Appendix B. The table in this appendix shows the calculated number of bedrooms based on the number of connections for the four categories of connection type. The TOTAL NUMBER OF BEDROOMS was calculated to be 1,873 (72+228+202+1,371=1,873). The AVERAGE NUMBER OF BEDROOMS PER CONNECTION was calculated to be 2.52 (1,873 / 744=2.52). 3.4. Appendix C shows the AVERAGE DAILY FLOW as reported on the corresponding DMR for the system for January 2021, the peak month for the study period. This data shows that the three highest flows occurred on January 7th 20t' and 25th. The AVERAGE DAILY FLOW FOR RESIDENTIAL COMPONENT was calculated by multiplying the PERCENTAGE OF RESIDENTIAL FLOW/ADF FOR PEAK MONTH (61%) from Appendix A by the AVERAGE DAILY FLOW. This product was then divided by the TOTAL NUMBER OF BEDROOMS from Appendix B (1,873)to yield the corresponding AVERAGE GALLONS PER BEDROOM/DAY found in the last column. The standard deviation for all values in the last column was calculated to be 2.42 gpd/bdr. The average of the three peak days was calculated to be 55.14 gpd/bdr. To be conservative the standard deviation of all of the values in the last column of Appendix C was added to the average of the three peak days to yield 57.56 gpd/bdr. 4. DISCUSSION OF RESULTS 4.1. The analysis shows a value of 57.56 gpd/bdr for the residential tributary flow to the system. At several points in the analysis calculations assumed a very conservative methodology namely in the calculation of total bedrooms for the system,the number of • Michael C. Gallant PE, PA Engineering/Consulting/Design NC Firm C-1989,AL Firm CA-4338—E NC Reg.No.-25572,AL Reg.No.-32178 total residential connections in the system and the inclusion of the standard deviation of all values for the peak three days in the study period. 4.2. Given the above analysis it would be prudent to assign a value of 60 gallons per day per bedroom for domestic residential flows tributary to the system. • s. Michael C. Gallant PE, PA Engineering/Consulting/Design NC Firm C-1989,AL Firm CA-4338—E NC Reg.No.-25572,AL Reg.No.-32178 Appendix A r MONTH-YEAR AVERAGE DAILY FLOW RESIDENTIAL COMMERCIAL COMMERCIAL FLOW RESIDENTIAL FLOW COMPONENT CONNECTIONS CONNECTIONS (GPD) (GPD) (GPD) January-20 94,184 629 55 38,714 55,470 February-20 112,307 651 55 44,263 68,044 March-20 120,686 644 55 68,988 51,698 April-20 111,503 691 55 38,294 73,209 May-20 108,156 714 55 35,696 72,460 June-20 121,876 728 56 33,839 88,037 July-20 134,733 811 56 40,422 94,311 August-20 141,446 828 56 47,353 94,093 September-20 149,196 842 56 44,250 104,946 October-20 143,243 863 56 41,022 102,221 November-20 152,871 877 56 44,951 107,920 December-20 152,265 732 70 48,065 104,200 January-21 158,609 744 70 62,502 96,107 Note:Connection totals were reduced for December 2020 and January 2021 per NCUC. PERCENTAGE OF RESIDENTIAL FLOW/ADF FOR PEAK MONTH 61 % • 1111110 Michael C. Gallant PE, PA Engineering/Consulting/Design NC Firm C-1989,AL Firm CA-4338—E NC Reg.No.-25572,AL Reg.No.-32178 Appendix B NUMBER OF NUMBER OF UNITS BEDROOMS NUMBER OF ONE BEDROOM APARTMENTS 72 72 NUMBER OF TWO BEDROOM APARTMENTS 114 228 NUMBER OF TWO BEDROOM 55 AND OVER 101 202 DWELLINGS NUMBER OF CONNECTIONS ASSUMED TO BE 3 BDRM ON 457 1,371 AVERAGE TOTAL NUMBER OF BEDROOMS 1,873 AVERAGE NUMBER OF BEDROOM/CONNECTION 2.52 • 0 OP sm Michael C. Gallant PE, PA Engineering/Consulting/Design NC Firm C-1989,AL Firm CA-4338—E NC Reg.No.-25572,AL Reg.No.-32178 Appendix C JANUARY 2021(PEAK MONTH IN THE STUDY PERIOD) DAY AVERAGE DAILY FLOW AVREAGE DAILY FLOW AVERAG GALLONS FOR RESIDENTIAL PER BEDROOM/DAY (GPD) (GPD) (GPD/BDR) 1 168,355 102,012 54 2 152,940 92,672 49 3 148,809 90,169 48 4 167,529 101,512 54 5 150,775 91,360 49 6 142,597 86,405 46 7 8 161,812 98,048 52 9 157,379 95,362 51 10 153,265 92,869 50 11 162,281 98,332 52 12 152,039 92,126 49 13 152,180 92,211 49 14 156,373 94,752 51 15 159,570 96,689 52 16 159,211 96,472 52 17 158,538 96,064 51 18 155,870 94,447 50 19 158,889 96,277 51 20 21 143,499 86,951 46 22 147,971 89,661 48 23 154,867 93,840 50 24 164,882 99,908 53 25 26 162,417 98,414 53 27 160,877 97,481 52 28 163,448 99,039 53 29 167,756 101,650 54 30 162,010 98,168 52 31 160,984 97,546 52 STANDARD DEVIATION AVERAG OF PEAK DAYS AVERAGE OF PEAK DAY PLUS STANDARD DEV. IP Michael C. Gallant PE, PA Engineering/Consulting/Design NC Firm C-1989,AL Firm CA-4338—E NC Reg.No.-25572,AL Reg.No.-32178 Appendix D January 2021 DMR FORM:NDMR 10-13 NON-DISCHARGE MONITORING REPORT(NDMR) Page / of Permit No.:WQ0037287 Facility Name: PLURIS HAMPSTEAD County: Pender Month: January Year: 2021 PPI: 001 Flow Measuring Point: E Influent El Effluent ❑No fbw generated Parameter Monitoring Point: ❑Influent El Effluent ❑Groundwater Lowering El Surface Water • Parameter Code -i 50050 00310 00940 31616 00610 00625 00620 00600 00400 00665 70300 00530 50060 C L ° .o. 0 ° 'm c c 2o in � 2 w . 672c co ocEE o xi u m 5 x 3L 2 2v .9,>. ¢ w EYO y ` O O O OAOoV F y O Z -a F O W .h 1- m L 0 �Z Z U U a cc UO 0O O rn 24-hr hrs GPD mg/L mg/L #/100 mL mg/L mg/L mg/L , mg/L su mg/L mg/L mg/L mg/L 1 168,355 ' 2 152,940 3 148,809 - 4 7:00am 8hrs 167,529 <2 <1 <0.2 0.7 0.16 0.9 7.52 0.5 <2.5 0 5 7:00am 8hrs 150,775 6.61 0.06 6 7:00am 8hrs 142,597 <2 <1 <0.2 1.1 0.66 1.8 7.55 1.73 <3.4 0.1 7 7:00am 8hrs 171,794 7.57 0.08 _ 8 7:00am 8hrs 161,812 7.64 0.1 - 9 157,379 - 10 153,265 l 11 7:00am 8hrs 162,281 <2 <1 <0.2 1 1.42 2.4 7.42 _ 0.23 <2.5 0.01 12 7:00am 8hrs 152,039 7.64 0.06 13 7:00am 8hrs 152,180 <2 <1 0.6 1 0.3 1.3 7.31 0.31 <2.5 0.05 14 7:00am 8hrs 156,373 7.78 0.05 15 7:00am 8hrs 159,570 7.34 0.07 16 159,211 17 158,538 18 7:00am 8hrs 155,870 <2 <1 <0.2 1 1.56 2.6 7.65 0.12 <2.5 0.01 19 7:00am 8hrs 158,889 7.62 0.07 20 7:00am 8hrs 169,777 <2 <1 <0.2 1 0.1 1.1 7.27 1.53 <2.5 0 21 7:00am 8hrs 143,499 7.63 0.1 22 7:00am 8hrs 147,971 - 7_51 0 23 154,867 24 164,882 25 7:00am 8hrs 169,748 <2 <1 <0.2 0.9 0.54 _ 1.4 7.35 0.7 <2.5 0.02 26 7:00am 8hrs 162,417 7.61 0.09 27 7:00am 8hrs 160,877 <2 <1 <0.2 1 <0.02 1 7.3 1.3 <2.5 0.01 28 7:00am 8hrs 163,448 7.53 0.09 _ 29 7:00am 8hrs 167,756 7.13 0.03 30 162,010 31 160,984 Average: 158,659 0.00 1.00 0.08 0.96 0.59 1.56 0.80 0.00 0.05 Daily Maximum: 171,794 2.00 1.00 0.60 1.10 1.56 2.60 7.78 1.73 3.40 0.10 Daily Minimum: 142,597 2.00 1.00 0.20 0.70 0.02 0.90 6.61 0.12 2.50 0.00 Sampling Type: Composite Composite Grab Composite Composite Composite Composite Grab _Composite_Composite Composite grab Monthly Avg.Limit: 250,000 10 14 4 10 4 2 15 Daily Limit: Sample Frequency: continous 2 xweek 3 xyear 2x week 2x week 2x week 2x week 2 xweek 5 xweek 2x week 3xyear 2 x week 5 x week FORM:NDMR 10-13 NON-DISCHARGE MONITORING REPORT(NDMR) Page of 6 Sampling Person(s) Certified Laboratories Name: KRISTION KING Name: ENVIRONMENTAL CHEMIST,INC Name: Name: • Does all monitoring data and sampling frequencies meet the requirements in Attachment A of your permit? C Compliant ❑Non-Comalant If the facility is non-compliant,please explain in the space below the reason(s)the facility was not in compliance. Provide in your explanation the date(s)of the non-compliance and describe the corrective action(s)taken.Attach additional sheets if necessary. Operator in Responsible Charge(CRC)Certification Permittee Certification ORC: KRISTION KING Permittee: MAURICE GALLARDA Certification No.: 1002807 Signing Official: RANDY HOFFER Grade: 4 Phone Number 910-327-2880 Signing Official's Title: REGIONAL MANAGER Has the ORC changed since the previous NDMR? ❑ Yes E No Phone Number: 910-327-2880 Permit Expiration: 1/31/2026 I v gnature Date Signatu Date By this si re.I certify that this report is accurate end complete to the best of my knowledge. I certify,under penalty of law,that this dowment and ere attachments were prepared order my direction or supervision in accordance with a system designed to asslae that all qualified personnel property gathered and evaluated the information submitted.Based on my inquiry of the person or persons who manage the system,or those persons direly responsible for gathering me information,the information submitted is,to the best of my knowledge and belief,True,accurate,and complete.I ate aware that there are significant penalties for submitting false information,including the possibility of fines and imprisonment for knowing vwlabona. Mail Original and Two Copies to: Division of Water Resources Information Processing Unit 1617 Mail Service Center Raleigh,North Carolina 27699-1617 N N N N1.01 N N N ND m V m m A W N +O (D m V A W N O (O m V m in p W N + O ( Day v 'o vo A o o c, c' c) c) A c> c> c-> ci o n. Weather Code ❑ a 0 = m m N w (n Cn A A U' A Cn N A m j W W WW A W N m A w WC.' 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P o cOoo + + otD 1D !O 0 S" 'O o O o o !D o o S° 0 o o O10 - o � N -0 Daily ❑ E o (m" o ,i w A m w o w m U oo' itD" w m (An (n om' a nm' m N m W o o t Loading i Z7 t 9 _ () W A A A A A A A A A A A A A A A A A A A A Freeboard CI > 0 m m i» .co J ip co (D lD ib i0 i0 O m (D 0 i0 (D O m i-0 z < Z o Cr o o m o 0 0 0 0 0 0 0 m o 0 0 0 0 0 (Basins Only) 0 0 ' - - N • J J J J J CO m J V 0) m m - 0 J J J V CO J J CO J J 0) Cn 0, J m - J n co W coJ m 0 N CT to cocoN A N J o co J O Cr co J co m J m Volume D W N $ m .+ m m U m W A O W N m O O ( N J N m m W -� �O' A J (NJ; O A m + N CV W m N J W A J O W J N O A - m o N 1p J J — Applied y ID CO W N CO N CO J (T CO A W J W CO CO CO N CO m W m N N CO A SS /� 7 a co m t t t f t t t 0 0 f o o t t tt t 0 0 0 t 0 f3 Infiltrated J 300000000oo 0oOoo 000 oo00 -13 D I co N co W co A A W Ni N + A N N N W N N + N N N W + o W + N W Daily -I O m v (D -; N N m N J V (D V( W + V N (D W (0 m A N V j m A (O (n m 0 t O z A w m (D m (D m J J m o N m J A m o (D (n J o (D o w (D o Loading in w N; 77 co A A A A A A A A A A A A A A A A A A A Freeboard ❑ rrt (`Ono 0 0 0 0 0 0 0 0 0 m 0 0 (n x 13 (Basins Only) o O 7J m Volume 0 o Z m Applied m 007 a C D 3 i9 a en .7 A 11 Ll y m V 1-1 g Time crl v ^ a S Infiltrated a i, 3 .) - .. P. - 7 10 v Daily ❑ -' Loading __ Freeboard Li (Basins Only) 6 z w Volume N m Applied m w n m CD CD E' Gl y 3 m 3 Time n5 p Z • 0.1 - CM S. Infiltrated a -4, m 3 0 •a - .. P. W li v Daily ❑ n 3, Loading p1 Freeboard ❑ i" (Basins Only) 6 j FORM:NDAR-2 08-11 NON-DISCHARGE APPLICATION REPORT(NDAR-2) Pace V. of 6 Did the application rates exceed the limits in Attachment B of your permit? O compliant ❑Non-Compliant If not a basin,were the sites kept free of vegetation and raked? E Compliant E Non-Compliant If not a basin,were there any instances of effluent ponding in or runoff from the sites? E Compliant ❑Non-cccn slant If a basin,were there any instances of breakout from the berms? E compliant E Non-Compliant Was the onsite automatically activated standby power source tested and operational? E Compliant 0 Non-Compliant if the facility is non-compliant,please explain in the space below the reason(s)the facility was not in compliance. Provide in your explanation the date(s)of the non-compliance and describe the corrective action(s)taken.Attach additional sheets if necessary. Operator in Responsible Charge(ORC)Certification Permittee Certification CRC: Kris king Permittee: MAURICE GALLARD • Certification No.: 1002807 Signing Official: RANDY HOFFER Grade: 4 Phone Number: Signing Official's Title: REGIONAL MANAGER Has the ORC changed since the previous NDAR-2 ❑ Yes E No Phone Number: 910-327-2880 Permit Exp.: 1/31/26 -2167/1 Si at a Date tune /Date By this signature,I ce fy mat is report is accurrate and complete to the test of my knowledge. certify,under penalty of law,that Via document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that aA qualified personnel property gathered and evaluated the information submitted.Based on my inquiry of the person or persons who manage the system,or those persons directly responsible for gathering the information,the information submitted is,to the best of my knowledge and belief,true,accurate.and complete.I am aware that there are signrfnnl penalties for submitting false imormation,including the possibility of fines and imprisonment for knowing violations. Mail Original and Two Copies to: Division of Water Resources Information Processing Unit 1617 Mail Service Center Raleigh,North Carolina 2 7699-1 61 7 • • FORM:NDMR 10-13 NON-DISCHARGE MONITORING REPORT(NDMR) Page s of C Permit No.:WQ0037287 Facility Name: PLURIS HAMPSTEAD County: Pender Month: January Year: 2021 PPI: 002 Flow Measuring Point: ❑ Influent 2 Effluent ❑No flow generated Parameter Monitoring Point: ❑Influent ❑Effluent Q Groundwater Lowering ❑Surface Water Parameter Code -s 50050 00940 31616 00610 00620 00600 00400 00665 70300 0 j y C C 2 V 5 U N )E E y uw n 9 61 32 '3 v_ 0 U E F-y LL t LL E 0 0 C - 0 ~ N O F O U U Q Z a. O 24-hr hrs GPD mg/L #/100 mL mg/L mglL mg/L su mg/L mg/L 1 2 • 3 4 7:00am 8hrs 7.83 5 7:00am 8hrs 7.71 6 7:00am 8hrs <1 <0.2 0.85 1.6 7.9 _ 0.95 7 7:00am 8hrs 7.88 8 7:00am 8hrs 7.8 9 • 10 11 7:00am 8hrs 7.94 12 7:00am 8hrs 7.95 13 7:00am 8hrs 7.87 14 7:00am 8hrs 7.93 15 7:00am 8hrs 7.91 16 17 - 18 7:00am 8hrs <1 <0.2 2.3 3.1 7.93 0.39 19 7:00am 8hrs 7.91 20 7:00am 8hrs 7.72 21 7:00am 8hrs 7.87 22 7:00am 8hrs 7.86 23 24 25 7:00am 8hrs 7.89 26 7:00am 8hrs 7.86 27 7:00am 8hrs 7.84 28 7:00am 8hrs 7.83 29 7:00am Stirs 7.76 30 31 Average: #13IV/01 1.00 0.00 1.58 2.35 0.67 Daily Maximum: 0 1.00 0.20 2.30 3.10 7.95 0.95 Daily Minimum: 0 1.00 0.20 0.85 1.60 7.71 0.39 Sampling Type: Grab Grab Grab Grab Grab Grab Grab Grab Monthly Avg.Limit: 250 1.5 10 500 Daily Limit: 6.5 to 8.5 Sample Frequency: 3 s year 2 x month 2 x month 2 x month 2 x month 5 x week 2 x month 3 x year FORM:NDMR 10-13 NON-DISCHARGE MONITORING REPORT(NDMR) Page b of (O Sampling Person,Is) Certified Laboratories Name: KRISTION KING Name: ENVIRONMENTAL CHEMIST,INC Name: Name: Does all monitoring data and sampling frequencies meet the requirements in Attachment A of your permit? E Compliant O Non-compliant If the facility is non-compliant,please explain in the space below the reason(s)the facility was not in compliance. Provide in your explanation the date(s)of the non-compliance and describe the corrective action(s)taken.Attach additional sheets if necessary. Operator in Responsible Charge(ORC)Certification Permittee Certification ORC: KRISTION KING Permittee: MAURICE GALLARDA Certification No.: 1002807 Signing Official: RANDY HOFFER Grade: 4 Phone Number: 910-3272880 Signing Official's Title: REGIONAL MANAGER Has the ORC changed since the previous NDMR? E Yes E No Phone Number: 910-327-2880 Permit Expiration: 1/31/2026 Signature Date CO-" Sign u e Date B this si• .sure.1 certify mat this report is accurrate and complete to the best of my knowledge. i certify,under penalty of law,that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that all qualified personnel property gathered and evaluated the erformation submitted.Based on my inquiry of the person or persons who manage the system,or those persons directly responsible for gathering the information.the information submitted is,to the best of my knowledge and belief,Irue.accurate.and complete.I am aware that there are significant penalties for suubmitting false information,including the possibility of fines and imprisonment for knowing violations. Mail Original and Two Copies to: Division of Water Resources Information Processing Unit 1617 Mail Service Center Raleigh,North Carolina 27699-1617