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Home My WebLink About2024 Grandview North Odor Study CITY OF CITY OF TWIN FALLS TWIN FALLS Public Works Department 119 South Park Avenue West 11,4v Twin Falls, ID 83301 OA<� Q�OQ SFR V�NG 2024 North Grandview Odor Study Background The City of Twin Falls City Council continues to support the ongoing study of sources and ways to mitigate foul odors throughout the City of Twin Falls. The main culprit has been tied to hydrogen sulfide,which, in some locations,is dispersed in the community through the sewer system. The city has collaborated for many years with an engineering firm to study the source of these odors and find ways to eliminate the sources or mitigate the impact on citizens. In the spring of 2023,the city purchased a carbon-based odor control system for testing the mitigation of hydrogen sulfide gases from the sewer system. The results were positive, and in December of 2023,the City Council approved purchasing a second carbon-based odor control system to continue the study and help mitigate hydrogen sulfide in two areas within the City that need it most during the summer of 2024. Mobile odor scrubber In 2023,the City of Twin Falls purchased a trailer-mounted carbon-based odor control system (mobile odor scrubber) from Anua International. The mobile odor scrubber can pull up to 650 cubic feet per minute of air through a 10-inch flexible hose connected to a sewer manhole. The air pulled from the sewer is pushed through approximately 35 cubic feet of activated carbon pellets. The carbon pellets absorb odorous hydrogen sulfide from the sewer. The mobile odor scrubber is intended to be used to better understand the permanent options available to address foul odors from the sewer that impact the community. MOM oars - Lp. Purpose of project During the summer of 2024,the City of Twin Falls plans to utilize the mobile odor scrubber to test locations for hydrogen sulfide mitigation from the Grandview sewer trunk line. This will be done by placing the mobile odor scrubber at different locations in the community north of Pole Line Road along the Grandview sewer trunk line. The goal is to understand the odor scrubber's effectiveness and identify a proposed location for a permanent installation of a carbon-based odor scrubber. Possible locations City staff have evaluated the study area for possible locations to test the mobile odor scrubber. Attachment A has the locations evaluated, along with an analysis of the location based on the criteria for selecting a location. The criteria considered when assessing locations were: • Would the manhole used impede the flow of traffic? • Is a city-owned power source(120v)available within 200 ft? • Is the location feasible to be used as a test location? • Does the area in proximity provide feasible options for a permanent location? Additionally,Appendix B identifies the location of odor loggers used to document and better understand the concentration of hydrogen sulfide within the sewer. Public involvement As the City of Twin Falls has grown, citizens have had ongoing concerns regarding the odors in the proposed study area. The City is committed to working with the community to find long-term solutions to the odor problem. Citizens are encouraged to report odor concerns via the online odor report form on the City of Twin Falls homepage. Additionally,citizens are encouraged to provide feedback throughout the study to help City staff identify the best path forward for the entire community. To facilitate this process,the City will hold the following meetings open to the public: • Project kickoff Open House—May 9, 2024,4-6 pm City Council Overflow Room at City Hall. The meeting is open to the public to provide information, answer questions,and for City staff to receive feedback from the public. The odor Scrubber will be on site for the public to see. • End of summer update Open House—September 24, 2024,4-6 pm, City Council Overflow Room at City Hall. City staff will provide data collected and what has been learned from the data. They will also discuss the current status of the project to receive feedback from the public. • Results of the 2024 study Presentation to Council—October 28,2024, 5 pm,Council Chambers at City Hall. Presentation of results and recommendations to the City council. Questions If you have any questions or would like to provide feedback,please contact: Nathan Erickson (208)735-7272 nerickson@tfid.org Appendix A: Locations explored for testing mobile air scrubber. 6,.,C7 e, �,. 5,176 6A.07, - B1-10781.108 •r _ _ --._ w r.. 06 li .4fi ... ,, 61.7:.:. m'61.155 JSM•10'I 61�7t75 B iB9 B1�166 Site E(B 1-1�9) Site G(B1-29) Site D B1-170 �"' 1 9.�_61,f oa..14011 tp•,0�61..7 61 17a ai-168• �B�1•1-�+6�4_, Site F(B1-48) i- ■■ �� { •12ft 31 125' 31-124 B1.115 B,• i. C'39 �. �.�1 �.i QA_A•AA i 'i J -a':.'� per... IN Mems! Pt5n.!Mi 77 f , �� 35NI IN Mom' apl, F, f# ,I RIP L ' fill® ��!! ■■�, Site C B1-19 son 1I _z,1 „ A3Q1 '•zo4�.62-�20�5 - ®92.211$ g2.214C �C2-22q� Site B(B2-290) -�-` ba. 82.2P7 -• �' iQ Site A(B2-59) 62.212 e2•213 s� B2.209 62.99 - OLE LINE RD Zz®= - //� An analysis of each location was considered for testing the mobile air scrubber. Site A(B2-59)—Manhole 132-59 is located approximately 30 feet east of the Grandview trunkline in the middle of the sidewalk on the north side of Pole Line Road. Due to its location on the sidewalk,its use would impede pedestrian passage and ADA compliance; it is also in ITD's right of way,which would likely make it challenging to acquire an easement. This is not likely a viable option for a test or permanent location. Site B (B2-290)—Manhole 132-290 is in the Grandview trunkline,located within the paved road on the east edge. There is a City-owned pressurized irrigation pump station located approximately 200 feet to the north,which could provide power.Due to the location of the manhole on the edge of the road,traffic would likely be impacted, and traffic may be reduced to one lane during the test. It is likely not the best location for a test due to traffic impact;however,the location of the PI station offers some potential for a permanent location. Site C(B1-I95)--Manhole B1-195 is located approximately 170 feet east of the Grandview trunkline through an 8-inch sewer line and is in the grass in a park/stormwater retention area owned by the City. There is a sprinkler control box approximately 70 feet to the southwest,which could possibly provide power. For the test,this location appears promising. It also has the potential for a permanent location. Site D(B 1-170)—Manhole B 1-170 is located approximately 230 feet south of the Grandview trunkline through an 8-inch sewer line and is in the center of a cul-de-sac. Though this location would have minimal traffic,its position in the center of the cul-de-sac is not ideal.Additionally, no city power source is nearby, and the stormwater basins to the north are deep and not owned by the City. This is likely not a viable option for a test or permanent location. Site E(B1-109)—Manhole B1-190 is located approximately 30 feet south of Grandview trunkline on Columbia Drive through an 8-inch sewer line. Due to the manhole's location on the road, traffic would likely be impacted.Additionally,there is no city power source nearby and no property owned by the City. This is likely not a viable option for a test or permanent location. Site F(B 1-48)—Manhole B 1-48 is located approximately 250 feet south of the Grandview trunkline on the east edge of Park View Drive through an 8-inch sewer line. The manhole is on the edge of the road,which is likely wide enough that traffic could be directed around it and keep both lanes open. The closest city power appears to be approximately 275 feet to the northeast. The distance from city power is more than 200 feet,which is necessary for this test;however,if power could be figured out,this may be a possible test location. The City owns the park to the east of this manhole,and the park/stormwater area could be a viable option for a permanent location. Site G(B 1-29)—Manhole B 1-29 is the last manhole in the Grandview trunkline before it drops off the canyon rim to the wastewater treatment plant. The manhole is located on the canyon rim walking path. A section of the walking path would need to be closed during the test,but users could be redirected around the area via a different path. City power is approximately 150 feet to the west. For the test,this location appears promising. The City owns the park to the west, and the park/stormwater area could be a viable option for a permanent location. Appendix B: Locations of hydrogen sulfide data logger locations during the test. ■ c B � -B'I.11B1113Bi - 81 11, �� mod'• - 61-107: 81-'10 B1-155 B1•1 of B1-179 ""os' R B 1-47 . B1.1 OU• - - �� 67&i' a,162 B1.102 B1-101 81.10 6, 61-04 \� 67-159 , 61-63 93 i 01.94 � 7 §1-92 � 61.86 6 _ 1-13 is1�611. e1-59 C1.39 1 1 i L B 1-95 B1-1z•� - aas- 61• Z71"1v -y -133 Moo - i W It M �■ ,31-14 L ` B1.195 B1.183 B7=1Q5 31 a =,81-196 ysI �161.16^ �� ice- '• 7"Gif �� 61 15132"26 e9.... 62 YWr - -F,I !off I.W111 �Cf.��w F.Mll B2-235 B2•313 •�i •-=== �� B2.2 77 62.2411 132-5 1, E B 1-195 82:�55 �� 62•: . 82-237 ��` B2:.54 B2-242 23 Et2-:51 6 2!i032-:.32 �3 IS 0i E,J <_ FJB2-249P82.23d .. _y - — �i', T�lA� I��1I� � 77�:��•y�Y �� 62"23:, 62-236 ��lN._r� ^/r'il� B2-241 B•t-22P �� 52:evu B2 22 B2;�21 `82 1,1�• ��®® rGl BeI B2-220 B2- 2 - j 2.324 82"219.,gy341 :,''. 204 82.205 82.3 B2-290 62.293 B2.323 B2322 .. B2-207 •1: B2.212 62.213 H C2.2 ''• _ ... s'82-208 _ 82-294 .. 1t209 •r ,6"3159 -_ B2-12. .R-7.1R - - '"" a � '/—. N.. zB2.69 - - POLE _ LINE RD V $, - 2 2-22PRIVPRIVAT