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Annual Report Supp_Higgins Way_22-12-17 Page 1 of 3 December 17, 2022 Douglas McDonald Northampton Department of Public Works 125 Locust St Northampton, MA 01060 Carolyn Misch Northampton Department of Planning and Sustainability 210 Main Street Northampton, MA 01060 RE: Annual Report Supplemental 2022 Stormwater Management Facilities Operation, Maintenance, and Inspection Activities Higgins Way, Northampton, MA Dear Mr. McDonald and Ms. Misch, As requested, this letter has been prepared to provide supplemental information to the 2022 Annual Report provided on September 29, 2022. The following is a summary of long-term stormwater facilities maintenance and inspection activities conducted from April to September 2022 within the Higgins Way development. Activities were conducted in accordance with the Stormwater Management Operation, Maintenance, and Inspection Agreement between the City of Northampton Department of Public Works and Sturbridge Development, LLC dated November 6, 2018. No concerns with the overall functionality of the stormwater facilities within the Higgins Way development were noted during the year. Activities completed are as follows:  A site-specific inspection form, based on requirements of the Agreement, was created by Wickedhoule Engineering, LLC and reviewed with HOA members interested in completing periodic inspections during a site walk held on April 22, 2022. During the site visit, HOA members were provided with educational instruction regarding each stormwater management facility and key items to observe and document during inspections. Subsequent inspections within the reporting period were completed by either Wickedhoule Engineering, LLC or trained HOA members. Inspections completed by HOA members were reviewed by Wickedhoule Engineering, LLC as they were conducted to confirm completeness and identify if any follow up maintenance or repairs were needed. Copies of all inspection reports have been attached to this letter. The following inspections were completed within the reporting period: o April 22, 2022 – All stormwater facilities were inspected by Wickedhoule Engineering, LLC for assessment of drawdown and infiltration. Estimated depth of sediment within the large subsurface infiltration system was also completed at this time. Page 2 of 3 o May 16, 2022 – Rain garden was inspected by HOA member for assessment of drawdown, health of vegetation, and to inspect for evidence of sediment buildup or erosion and of erosion. o May 18, 2022 – Rain garden was inspected by HOA member for assessment of drawdown and confirmation of removal of debris in culvert. o June 1, 2022 – Rain garden was inspected by HOA member for assessment of drawdown, health of vegetation, and to inspect for evidence of sediment buildup or erosion. Catch basins were also inspected for evidence of clogging or buildup of sediment and/or debris. o June 15, 2022 – All stormwater facilities were inspected by Wickedhoule Engineering, LLC for assessment of drawdown and infiltration. o June 23, 2022 – All stormwater facilities were inspected by Wickedhoule Engineering, LLC for assessment of drawdown and infiltration. o July 14, 2022 – Rain garden was inspected by HOA member for assessment of drawdown, health of vegetation, and to inspect for evidence of sediment buildup or erosion. Catch basins were also inspected for evidence of clogging or buildup of sediment and/or debris. Detention basins were also inspected for erosion, sediment, vegetation, and condition of outlet structures and spillway. o August 26, 2022 – All stormwater facilities were inspected by Wickedhoule Engineering, LLC for assessment of drawdown and infiltration. Estimated depth of sediment within the large subsurface infiltration system was also completed at this time. o August 31, 2022 – Annual assessment of porous pavers for exfiltration capacities was completed by Wickedhoule Engineering. o September 10, 2022 – All stormwater facilities were inspected by Wickedhoule Engineering, LLC for assessment of drawdown and infiltration.  The HOA’s landscaping contractor, Saint’s Landscaping, performed spring cleanup activities on April 22, 2022 and routine landscaping care within the development every two to three weeks throughout the spring, summer, and fall. Spring cleanup activities included: o Removal of leaves and debris collected in catch basins and rain garden inlet pipes. o Removal of vegetation growth within gravel paths. o Removal of leaves and debris within both Detention Basin #1 and Detention Basin #2. o Vacuuming of roads, sidewalks, 10’ wide public path, and porous pavers. o Mowing of Detention Basin #2 side slopes, embankment, and emergency spillway areas.  The HOA completed re-seeding of Detention Basin #1 after spring cleanup activities.  Roads, sidewalks, porous pavers, and 10’ wide public path were swept by HOA members throughout the spring, summer, and fall when sand or debris was observed in addition to vacuuming of these areas during spring cleanup on April 22, 2022.  Porous pavers were power washed by HOA members on October 15, 2022 and November 5, 2022. Details will be provided in the 2023 Annual Report.  Rain garden, Detention Basin #1, and Detention Basin #2 areas were inspected for the presence of invasive vegetation species by Peter Curtis, Ph.D., Botany on September 27, 2022. No invasive species were observed. A copy of the evaluation is attached to this letter. Page 3 of 3 Maintenance and inspection activities have been continued since the 2022 reporting period and documentation is being maintained by both the HOA and Wickedhoule Engineering, LLC in support of next year’s annual report. Please let me know if you have any additional questions and I may be reached at (413) 250-8739. Regards, Victoria A. Houle, P.E. Wickedhoule Engineering, LLC Attachments A – Inspection Reports B – Invasive Species Evaluation   Site photographs – 4‐22‐22    Page 1 of 2                                                   Detention Basin #1                 Stone dust path to detention basin #2                                                     Detention basin #2             Outfall from detention basin #2    Site photographs – 4‐22‐22    Page 2 of 2                                                   Rain garden                                                                Porous pavers                               Stormwater Management Facilities Inspection Form Higgins Way Northampton, MA Date/Time: '?/IV / "2--02 '2... • I Inspector: ]$..e--Jt,, ¼' '>:/ Date of previous rainfall event: t; /t '5 /2.01,, "2--- Purpose for inspection: __ J_ Inspection after storm event (less than 3 inches in 24 hours) ___ Inspection after major storm event (3 inches or greater in 24 hours) Gravel and stone dust paths After storm events Is there evidence of erosion? Y /N Is any buildup of sediment or debris? Y /N 000 Temperature: _o __ Weather Conditions: Cl-tA.v, ~Lt Y\V\Y Amount of precipitation: O · o "3 .,., (previous rainfall event) I~ https://maps.cocorahs.orq/ _✓ __ Assess for drawdown and infiltration _J __ Other (specify): tl ~~t:.H , ~f r1Nj C 1-e,rn 1 ~ Y'l-t-l-J. s / Additional comments: _____________ ---.,,__ __________ _ Porous Pavers After storm events Is there evidence of erosion? Y /N Is any buildup of sediment or debris? ' , Additional comments:------,;!.:......_ ____________________ _ Annually by Engineer Is there evide e of deterioration? Y /N Exfiltration apacity assessment: _____________________ _ Page 1 of 4 Deep Sump Catch Basins After storm events Catch Basin# PCB#l Rim Elev. 201.74 Invert Out 199.08 Bottom of catch basin 195.08 Is sediment present? Y/N PCB#l -Is depth to top of sediment less tha CB in front of #15 Higgins Way Rim Elev. 216.62 Invert Out 213.00 *no sump CB in front of #79 Higgins Rim Elev. 216.37 Is there evidence of erosion? Y/N Is any buildup of sediment or debris?. Is vegetation cover adequate? Y Is any undesirable vegetatio resent? Y /N Does embankment appe stable? Y/N Is there any trash pre nt? Y /N Does outlet contr structure appear to be in good condition? Y /N Is stone filter 1p in good condition? Y /N Additional Evidence of Clogging? Y/N Within 72 hours of rainfall event -S/1 ZS/ "2--1) '2-'l.. YM~ t" ll -t v-e-~-t (> • o '3 ........ /1 ~Ac.,e. -ate an time of follow up inspection: --==---'--S-'-/t....:1.c:.t,1-/...::.?.-=-l)...::.2-c.c."'-_--'-"\::l...:..~......:1c...::l>~p:-,c\'\'\~-------- ls there any standing water present? v@ ' Additional comments: -------......,.....---,---.,-----------------s ,rw...-!-tAW--s W. i~ ..:.. be:o{h c~lv-t rh Page 2 of 4 6/, t, /-;.o~r ' .. Detention Basin #1 After stt/Jrm events -',Js there evidence of erosion within basin area? Y/N -''Is any buildup of sediment or debris within basin area? Y/N ·is vegetation cover adequate? Y /N Is any undesira.ble vegetation present? Y /N Do basin slopes appear stable with healthy vegetation and no e ·c1ence of cracking? Y/N Is there evidence of erosion or scouring at the bottom of the asin present? Y /N · Is there any trash present? Y /N Does outlet control structure appear to be in good condi -· Additional comments: -----------~--------------- Detention Basin #2 After storm events Is there evidence of erosion withi Is any buildup of sediment or d ris within basin area? Y/N . Is vegetation cover adequate?. /N Is any undesirable vegetati present? Y /N . Do basin slopes appears ble with healthy vegetation and no evidence of cracking? Y /N Do overflow areas app r stable with healthy vegetation and no evidence of cracking? Y /N Is there evidence of osion or scouring at the bottom of the basin present? Y /N Is there any trash esent? Y /N Does outlet cont ol structure appear to be in good condition? Y /N Is outlet contr structure free of floatables? Y /N Is emergenc spillway in good condition? Y/N Is there ev· ence of erosion of rip rap area present? Y /N Is there ny buildup of sedimentation or debris in rip rap area? Y/N Additi nal comments: __________________________ _ '5 /t t, /io ?-,-Page 3 of 4 Large Subsurface Infiltration System After storm events Is there standing water or depressions present above underground subsurface Additional comments: __________________ ..,,.._ ______ _ Twice per year by Engineer within 72 hours of rainfall event Date and time of follow up inspection:-------'--------------- Are inlets and outlets clear and free of clogging? Y /N Is there standing water or depressions present above nderground subsurface system? Y /N Sediment measurements: Inspection Port West Side Port #1 (Most South) Port #2 Port #3 Port #4 (Most North) East Side Port #5 (Most South) Port #6 Port #7 Is depth of ediment greater than 3 inches? Y /N If yes, cl ning is required. Additi al comments: _________________________ _ 6' Jt ~/~o'JJ!'age 4 of 4 Stormwater Management Facilities Inspection Form Higgins Way Northampton, MA Date/Time: 6 f ( ~ ( '2-() ')..l-. Inspector: ~ k?Y:t}pY Date of previous rainfall event: 6 / n / ';).,o");).- Purpose for inspection: ✓ Inspection after storm event (less than 3 inches in 24 hours) ___ Inspection after major storm event (3 inches or greater in 24 hours) Gravel and stone dust paths After storm events Is there evidence of erosion? Y/N Is any buildup of sediment or debris? Y/N ~op Temperature: __ _ Weather Conditions: d~ t-, ~" >1 "Y Ii // Amount of precipitation: t> · • ~ (previous rainfall event) https://maps.cocorahs.orq/ ✓ Assess for drawdown and infiltration --- ✓ Other (specify): docuwi,4;if . . spnr'5 cl~ni~ p-1.--f ~ Additional comments: --------------..,,,C..----------- Porous Pavers After storm events Is there evidence of erosion? Is any buildup of sediment or deb · ? Y/N Additional comments:---+------------------------ Annually by Engineer Is there ev· ence of deterioration? Y/N 5/1 ?J /'J,() ~;;r Page 1 of 4 Deep Sump Catch Basins After storm events Catch Basin # PCB#1 Rim Elev. 201.74 Invert Out 199.08 Bottom of catch basin 195.08 Is sediment present? Y/N PCB#1 -Is depth to top of sediment less than 4. CB in front of #15 Higgins Way Rim Elev. 216.62 Invert Out 213.00 *no sump CB in front of #79 Hi Depth to top of sediment Additional comments: _________________________ _ ter storm events Is there evidence of erosion? Y/N Is any buildup of sediment or debris? , Is vegetation cover adequate? Y/ Is any undesirable vegetatio resent? Y /N Does embankment appe stable? Y/N Is there any trash pr nt? Y /N Does outlet cont structure appear to be in good condition? Y /N Is stone filte rip in good condition? Y /N Addition comments: _________________________ _ -C ;;thin 72 hours of rainfall evenD 5/i 1 /')..o ~~ ", 't~ // Y~t" 11 -Date and time of follow up inspection: '5 /18 h -cn .. ~ (p : 1q pm -Is there any standing water present? v....,@~___,,_-=+-, -=-------'---=-..,__-,,,..,.:-=---------- Additional comments:,--------,-----,--------------------~ ~ '5a1111i ,;, hoh,.,. t-t,t,lv-er k , n be 5 /[ 71 (~?-?-Page 2 of 4 Detention Basin #1 After storm events Is there evidence of erosion within basin area? Y /N Is any buildup of sediment or debris within basin area? Y/N Is vegetation cover adequate? Y /N Is any undesirable vegetation present? Y /N Do basin slopes appear stable with healthy vegetation and no evidence f cracking? Y /N Is there evidence of erosion or scouring at the bottom of the basin pr sent? Y/N Is there any trash present? Y /N Does outlet control structure appear to be in good condition? Y / Additional comments: --------------+------------- Detention Basin #2 After storm events Is there evidence of erosion within basin ar a? Y /N Is any buildup of sediment or debris wit · basin area? Y/N Is vegetation cover adequate? Y /N Is any undesirable vegetation presen . Y /N Do basin slopes appear stable with ealthy vegetation and no evidence of cracking? Y/N Do overflow areas appear stabl ith healthy vegetation and no evidence of cracking? Y /N Is there evidence of erosion scouring at the bottom of the basin present? Y/N Is there any trash present? /N Does outlet control stru ure appear to be in good condition? Y /N Is outlet control struc re free of floatables? Y /N Is emergency spill yin good condition? Y/N Is there evidenc of erosion of rip rap area present? Y /N Is there any b dup of sedimentation or debris in rip rap area? Y/N Additional 6 /1 tp.c>~ Page 3 of 4 Large Subsurface Infiltration System After storm events Is there standing water or depressions present above underground subsu Additional comments: __________________________ _ Twice per year by Engineer within 72 hours of rainfall event Date and time of follow up inspection:------'--------------- Are inlets and outlets clear and free of clogging? Y /N Is there standing water or depressions present abo e underground subsurface system? Y /N Sediment measurements: Inspection Port West Side Port #1 (Most South) Port #2 Port #3 Port #4 (Most North) East Side Port #5 (Most South) Port #6 Is depth o ediment greater than 3 inches? Y /N If yes, cl aning is required. Addi · nal comments: -------------------------- 5°/t8/~age 4 of 4 Stormwater Management Facili1es Inspec1on Form Higgins Way Northampton, MA Date/Time: June 1, 2022 Temperature: 64° Inspector: John Goodnough Weather CondiAons: Clear Date of previous rainfall event: 5/29 Amount of precipitaAon: 0.07” (previous rainfall event) https://maps.cocorahs.org/ Purpose for inspecAon: InspecAon aNer storm event Assess for drawdown and infiltraAon (less than 3 inches in 24 hours) InspecAon aNer major storm event X Other (specify): Monthly rain garden (3 inches or greater in 24 hours) Gravel and stone dust paths A"er storm events -Is there evidence of erosion? Y/N -Is any buildup of sediment or debris? Y/N -AddiAonal comments: Porous Pavers A"er storm events -Is there evidence of erosion? Y/N -Is any buildup of sediment or debris? Y/N -AddiAonal comments: Annually by Engineer -Is there evidence of deterioraAon? Y/N -ExfiltraAon capacity assessment: Page of 1 4 Deep Sump Catch Basins A"er storm events -AddiAonal comments: Rain Garden A"er storm events -Is there evidence of erosion? No -Is any buildup of sediment or debris? No -Is vegetaAon cover adequate? Yes -Is any undesirable vegetaAon present? No -Does embankment appear stable? Yes -Is there any trash present? No -Does outlet control structure appear to be in good condiAon? Yes -Is stone filter strip in good condiAon? Yes -AddiAonal comments: Two small Catch Basins completely clear of debris. Outlet structure into rain garden clean and clear of all debris Within 72 hours of rainfall event -Date and Ame of follow up inspecAon: -Is there any standing water present? Y/N -AddiAonal comments: Catch Basin #Is sediment present? Y/N Depth to top of sediment Evidence of Clogging? Y/N PCB #1 Rim Elev. 201.74 Invert Out 199.08 Bodom of catch basin 195.08 PCB#1 - Is depth to top of sediment less than 4.66 feet? Y/N CB in front of #15 Higgins Way Rim Elev. 216.62 Invert Out 213.00 *no sump CB in front of #79 Higgins Way Rim Elev. 216.37 Invert Out 213.00 *no sump Page of 2 4 Deten1on Basin #1 A"er storm events -Is there evidence of erosion within basin area? Y/N -Is any buildup of sediment or debris within basin area? Y/N -Is vegetaAon cover adequate? Y/N -Is any undesirable vegetaAon present? Y/N -Do basin slopes appear stable with healthy vegetaAon and no evidence of cracking? Y/N -Is there evidence of erosion or scouring at the bodom of the basin present? Y/N -Is there any trash present? Y/N -Does outlet control structure appear to be in good condiAon? Y/N -AddiAonal comments: Deten1on Basin #2 A"er storm events -Is there evidence of erosion within basin area? Y/N -Is any buildup of sediment or debris within basin area? Y/N -Is vegetaAon cover adequate? Y/N -Is any undesirable vegetaAon present? Y/N -Do basin slopes appear stable with healthy vegetaAon and no evidence of cracking? Y/N -Do overflow areas appear stable with healthy vegetaAon and no evidence of cracking? Y/N -Is there evidence of erosion or scouring at the bodom of the basin present? Y/N -Is there any trash present? Y/N -Does outlet control structure appear to be in good condiAon? Y/N -Is outlet control structure free of floatables? Y/N -Is emergency spillway in good condiAon? Y/N -Is there evidence of erosion of rip rap area present? Y/N -Is there any buildup of sedimentaAon or debris in rip rap area? Y/N -AddiAonal comments: Page of 3 4 Large Subsurface Infiltra1on System A"er storm events -Is there standing water or depressions present above underground subsurface system? Y/N -AddiAonal comments: Twice per year by Engineer within 72 hours of rainfall event -Date and Ame of follow up inspecAon: -Are inlets and outlets clear and free of clogging? Y/N -Is there standing water or depressions present above underground subsurface system? Y/N -Sediment measurements: -Is depth of sediment greater than 3 inches? Y/N If yes, cleaning is required. -AddiAonal comments: Inspec1on Port Depth of sediment West Side Port #1 (Most South) Port #2 Port #3 Port #4 (Most North) East Side Port #5 (Most South) Port #6 Port #7 Port #8 (Most North) InspecAon port aNer CB Page of 4 4 West Catch Basin   Site photographs – 6‐15‐22    Page 1 of 1                                                   Detention Basin #1                 Stone dust path to detention basin #2                                                     Detention basin #2                             Rain garden    Site photographs – 6‐23‐22    Page 1 of 3                                                   Detention basin #1                  Stone dust path to detention basin #2                                                     Detention basin #2                      Detention basin #2    Site photographs – 6‐23‐22    Page 2 of 3                                               Porous pavers (east side)                        Porous pavers (west side)                                       Top of subsurface infiltration system    Top of subsurface infiltration system             (facing west)      (facing east)       Site photographs – 6‐23‐22    Page 3 of 3                                                       Rain garden                                       Rain garden                                                     Rain garden  Stormwater Management Facili1es Inspec1on Form Higgins Way Northampton, MA Date/Time: 7/14/2022 Temperature: 66° Inspector: John Goodnough Weather CondiAons: CLOUDY Date of previous rainfall event: 7/13 Amount of precipitaAon: .42 (previous rainfall event) https://maps.cocorahs.org/ Purpose for inspecAon: InspecAon aOer storm event Assess for drawdown and infiltraAon (less than 3 inches in 24 hours) InspecAon aOer major storm event X Other (specify): Monthly inspect. (3 inches or greater in 24 hours) Gravel and stone dust paths A"er storm events -Is there evidence of erosion? NO -Is any buildup of sediment or debris? NO -AddiAonal comments: Porous Pavers A"er storm events -Is there evidence of erosion? NO -Is any buildup of sediment or debris? NO -AddiAonal comments: Annually by Engineer -Is there evidence of deterioraAon? Y/N -ExfiltraAon capacity assessment: Page of 1 4 Deep Sump Catch Basins A"er storm events -AddiAonal comments: Both small catch basins were totally clear of dirt or debris. Large Basin water level had dropped to expose the top of the hood. There was pollen visible on top of water in basin Rain Garden A"er storm events -Is there evidence of erosion? NO -Is any buildup of sediment or debris? NO -Is vegetaAon cover adequate? YES -Is any undesirable vegetaAon present? NO -Does embankment appear stable? YES -Is there any trash present? NO -Does outlet control structure appear to be in good condiAon? YES -Is stone filter strip in good condiAon? YES -AddiAonal comments: Rain Garden basin was dry Within 72 hours of rainfall event -Date and Ame of follow up inspecAon: 7/14 -Is there any standing water present? NO -AddiAonal comments: Rainfall on 7/12 (.73”) and 7/13 (.42”) Catch Basin #Is sediment present? Y/N Depth to top of sediment Evidence of Clogging? Y/N PCB #1 Rim Elev. 201.74 Invert Out 199.08 Bodom of catch basin 195.08 NO N/A NO PCB#1 - Is depth to top of sediment less than 4.66 feet? Y/N CB in front of #15 Higgins Way Rim Elev. 216.62 Invert Out 213.00 *no sump NO NONE NO CB in front of #79 Higgins Way Rim Elev. 216.37 Invert Out 213.00 *no sump NO NONE NO Page of 2 4 Deten1on Basin #1 A"er storm events -Is there evidence of erosion? NO -Is any buildup of sediment or debris? NO -Is vegetaAon cover adequate? YES -Is any undesirable vegetaAon present? NO -Does embankment appear stable? YES -Is there any trash present? NO -Does outlet control structure appear to be in good condiAon? YES -Is stone filter strip in good condiAon? YES -AddiAonal comments: Deten1on Basin #2 A"er storm events -Is there evidence of erosion within basin area? NO -Is any buildup of sediment or debris within basin area? NO -Is vegetaAon cover adequate? YES -Is any undesirable vegetaAon present? SOME WOODY GROWTH NOTED-TO BE CUT IN FALL -Do basin slopes appear stable with healthy vegetaAon and no evidence of cracking? YES -Do overflow areas appear stable with healthy vegetaAon and no evidence of cracking? YES -Is there evidence of erosion or scouring at the bodom of the basin present? NO -Is there any trash present? NO -Does outlet control structure appear to be in good condiAon? YES -Is outlet control structure free of floatables? YES -Is emergency spillway in good condiAon? YES -Is there evidence of erosion of rip rap area present? NO -Is there any buildup of sedimentaAon or debris in rip rap area? NO -AddiAonal comments: Page of 3 4 Large Subsurface Infiltra1on System A"er storm events -Is there standing water or depressions present above underground subsurface system? Y/N -AddiAonal comments: N/A Twice per year by Engineer within 72 hours of rainfall event -Date and Ame of follow up inspecAon: -Are inlets and outlets clear and free of clogging? Y/N -Is there standing water or depressions present above underground subsurface system? Y/N -Sediment measurements: -Is depth of sediment greater than 3 inches? Y/N If yes, cleaning is required. -AddiAonal comments: Inspec1on Port Depth of sediment West Side Port #1 (Most South) Port #2 Port #3 Port #4 (Most North) East Side Port #5 (Most South) Port #6 Port #7 Port #8 (Most North) InspecAon port aOer CB Page of 4 4   Site photographs – 8‐26‐22    Page 1 of 2                                                   Detention Basin #1                 Stone dust path to detention basin #2                                                     Detention basin #2                  Detention basin #2    Site photographs – 8‐26‐22    Page 2 of 2                                                   Rain garden                                                                Rain garden                                             West side porous pavers                East side porous pavers    Site photographs – 8‐31‐22    Page 1 of 2                              West side porous pavers after    East side porous pavers after              condition assessment (4:43 PM)                   condition assessment (4:43 PM)                                                      Detention basin #1                    Detention basin #2    Site photographs – 8‐31‐22    Page 2 of 2                                                      Rain garden                                    Site photographs – 9‐10‐22    Page 1 of 3                                               West side porous pavers                                           East side porous pavers                                                     Top of rain garden                                      Rain garden     Site photographs – 9‐10‐22    Page 2 of 3                                                        Rain garden                                               Detention basin #1                                         Gravel path to detention basin #2                              Detention basin #2    Site photographs – 9‐10‐22    Page 3 of 3                                                   Detention basin #2                                              Detention basin #2                                     Area of subsurface infiltration systems    Higgins Way Detention Ponds, Invasive Species Report September 27, 2022 Submitted by: Peter Curtis, 47 Higgins Way. Professor Emeritus of Botany, The Ohio State University Our two detention ponds are examined multiple times per year for the presence of invasive plants as defined by the Massachusetts Invasive Plants Advisory Group (https://www.massnrc.org/mipag/invasive.htm). Any invasive or non-invasive woody species are removed as soon as possible. Small detention pond. This detention pond was re-graded and seeded during the summer of 2022. Current vegetation consists entirely of the grasses that were seeded in plus small forbs such as common sorrel (Rumex acetosa). No invasive species were found. Large detention pond. This detention pond now has an abundance of herbaceous vegetation, as detailed below. With the exception of one small patch of multiflora rose (Rosa multiflora) no invasive species were found. The multiflora rose plus several cottonwood seedlings have been removed.