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Traffic ... Transportation and Traffic Engineering PLANNING. DESIGN September 13. 1996 MrJ eff Kennedy Twin County Credit Union POBox 718 Olympia. WA 98507 c~\\J~O R ~ \~~fQ st~ \. ~ C~, \'N\~ CO. The Trans~o Group TG 96290 00 SUBJECT' TWIN COUNTY CREDIT UNION -TRIP GENERATION STUDY Dear Jeff. The purpose of this letter is to describe the trip generation characteristics of the proposed Yelm Twin County Credit Union. This letter summarizes the results of a trip generation analysis conducted at existing Twin County Credit Union facilities in the Thurston and Pierce County area. The proposed Yelm Twin County Credit Union would be approximately 3.350 square feet (sf) and would serve approximately 890 members in its first year Since the trip generation estimates will be used to assess traffic impact fees for the City ofYelm's 6 year Transportation Improvement Program (TIP), growth in credit union membership was forecast out over the 6 year horizon. The remainder of this memorandum describes the data collection. analysis, and results of the trip generation study ITE Trip Generation Manual Generally. to estimate the traffic demand generated by a particular land use, traffic engineers utilize the Institute of Transportation Engineers (ITE) Trip Generation ManuaL However, the ITE Trip Generation Manual. 5th Edition does not have a specific land use category for a Credit Union. The ITE Manual has a Walk-In Bank (Land Use 911), a Drive-In Bank (Land Use 912), and a Walk-In, and Drive-In Savings and Loan (Land Uses 913 and 914) All four land uses have limited data with the Drive-In Bank providing the most information however the data points are scattered for a variety of independent variables thereby yielding inconsistent and unreliable results. The trip generation rates for a Drive-In Bank and a Drive-In Savings & Loan differ significantly and widely across independent variables such as employees, number of drive-in windows, and building square footage. It is important to recognize that there is only one documented study for the Savings & Loan, and the trip rates for the Bank trip rate range from 3.0 to 242.5 trips per 1,000 gsf of building. Additionally, the trip generation to a Bank and/or a Savings & Loan is affected by the surrounding land uses, traffic characteristics of surrounding roadways. accessibility. services offered (Le Automated Teller Machines), etc. Since no reliable trip generation data for a Credit Union was available, studies of existing Twin County Credit Union facilities were undertaken to assess the trip generation characteristics of existing Twin County Credit Unions. Since both the Bank and Savings and Loan are significantly different than a Credit Union in that membership is restricted at a Credit Union versus the open banking policies at a Bank and/or a Savings and Loan, the trip generation study focused on traffic generated from a membership and transaction basis. With restricted membership the Credit Union has fewer members to draw upon than a Bank or a Savings & Loan. The independent variables in the ITE Trip Generation Manual for Banks and Savings and Loans are building size. number of employees, and number of drive-in windows. For a Credit Union, the membership at each branch is known and can be used as a predictor of the total number of transactions. which in turn can be used to assess the travel The TRANSPO Group, Inc. 14335 N E. 24th Street. SUite 201 Bellevue Washington 98007 FAX. 206/747 3688 206/641 3881 '- The Trans~o Group demand. The number of members is a more reliable variable for predicting traffic than any of the previously mentioned ITE variables since it is the membership that actually generates the traffic. Ms. Jeff Kennedy September 13, 1996 Page 2 Data Collection and Analysis To establish a more refined estimate of trip generation characteristics of the Twin County Credit Union, transaction and traffic data were collected at existing Twin County Credit Union branch facilities in Thurston and Pierce County that have similar characteristics to the proposed Yelm branch. The traffic counts were conducted during the weekday PM peak hour on Wednesday August 14, 1996. No traffic count information was taken at the Tacoma Branch since it is not a self-contained branch like the Olympia and Lacey Branches. The attached worksheet shows the results of the trip generation analysis for the three branches studied. To arrive at a reasonable trip generation estimate, the total number of transactions during the weekday PM peak hour was compared to the total number of members at each branch that you provided. The total number of transactions per member during the weekday PM peak hour ranged from 0 008 at Olympia and Tacoma to 0 019 at Lacey A comparison of the trip rates per transaction yielded trip rates from 1 85 to 1 96 trips per transaction during the weekday PM peak hour These trip rates are intuitive since generally one transaction would generate two auto trips assuming all single occupant vehicles. The slightly less than 2.0 trip rate (1 85 to 1 96) reflect the fact that not all visitors to the branch travel in single occupant vehicles. they may use transit, walk, or be a passenger in another vehicle. Since it is the Tacoma Branch that best replicates the membership base of that of the proposed Yelm Branch, the weekday PM peak hour transactions/member rate of 0 008 was utilized. Assuming a membership base of 890 for the Yelm Branch and a weekday PM peak hour transactions/member rate of 0 008. a total of approximately 7 transactions is predicted to occur at the Yelm Branch during the weekday PM peak hour in its first year of operation. Applying the 1 96 trips per transaction that was observed at the Olympia Branch to the proposed Yelm Branch. a total of approximately 14 weekday PM peak hour trips are predicted for the proposed Yelm Branch based on the data collected at the existing Twin County Credit Union Branches. The City ofYelm estimates population and employment growth of approximately 4 percent per year over the 6 year TIP horizon. Applying the 4 percent per year to the membership base of 890. the total number of members in 6 years would be 1.126 Applying the transactions per member rate of 0008 and 1 96 trips per transaction to the 1,126 total members yields a total of 17 weekday PM peak hour trips. Trip Characteristics Of the total number of trips to a facility such as a Bank. three basic types of trips typically occur The three trip types are described below' 1 Pass-By Trips - These trips already exist on the roadways that provide primary access to the development and are being made for some purpose other than visit- ing the facilities (for example. work-to-home) Pass-by trips do not result in any increase in background traffic volumes in the study area, and therefore have no additional effect on the road system beyond the development's driveways. 2. Diverted Trips - This category refers to trips attracted from the traffic volume on roadways within the vicinity of the generator but which require a diversion from Ms. Jeff Kennedy September 13, 1996 Page 3 The TranSIIO Group that roadway to another roadway to gain access to the site These roadways could include streets or freeways adjacent to the generator, but without access to the generator Therefore. the diverted trip component of the total generated demand typically causes no change in the total number of vehicle trips within the overall road system of the area. This shift in traffic patterns through diversion often causes a net reduction in total vehicle miles traveled on the areawide transporta- tion system. 3. New (Primary) Trips - These trips are those that would not have been made with- out the existence of the proposed development. Therefore, this is the only trip type that results in an increase in the total number of trips made within the study area. These are also the only trips that represent additional vehicle miles of travel on the transportation system. For the purposes of the analysis for the proposed Yelm Twin County Credit Union, the pass-by trip components were assumed to be 30 percent of the total trips. Although there is no specific information in the ITE Trip Generation Manual for trip characteristics of financial institutions, a trip to a Credit Union is typically part of another trip to and from a separate origin and destination. It is important to recognize that the maj ority of members at the proposed Yelm Branch are already being served by the existing Olympia and Lacy Branches. Thus, these Yelm Branch members who are utilizing existing Olympia and Lacey Branches would already be on the roadway as either a pass-by or diverted trip to the new Yelm Branch. Table 1 shows the estimated trip generation for the proposed Yelm Branch of the Twin County Credit Union. Trip Generation PM Peak Hour 17 5 12 As shown in Table 1, the proposed project is expected to generate a total of 17 weekday PM peak hour trips after 6 years of growth, with 12 of these being net new trips to the street system. We trust that this analysis provides the level of detail necessary for accurately estimating the trip generation from your proposed Yelm Branch. Please call me if you have any questions or comments regarding the analysis described in this letter Sincerely, The TRANSPO Group. Inc. -T6~ y; Uec{jy~r i Bruce R. Haldors Senior Transportation Engineer Attachment \96290\96290L 1 Twin County Credit Union Trip Generation Analysis Lacey - 1135 Bowker St TIME END IN OUT 4:15 17 23 4:30 22 21 4 45 15 20 5:00 22 23 5.15 15 25 5:30 14 18 5.45 2 8 6:00 2 2 No. of Members = Transactions/Member = 4,695 0.019 TOTAL 40 43 35 45 40 32 10 4 HOURLY TRANS. TriplTrans. 163 163 152 127 86 88 1 85 Olympia - 1020 E. 5th TIME END IN OUT 4'15 12 13 4~0 10 14 4.45 18 13 5:00 18 17 ~15 20 16 5~0 10 19 5.45 6:00 No. of Members = Transactions/Member = 8,550 0008 TOTAL 25 24 31 35 36 29 Tacoma Branch No. of Members = 1,383 Transactions (4 PM - 5 PM) = 11 Transactions/Member = 0.008 TRIPGEN.XLS HOURLY TRANS TriplTrans. 115 126 131 67 1.96 The Transllo Group ~--------~ ~~/- ~ -==~-~~-= ~ CQi)..S ( 5tid- t12l- 1,C (!--< -- ___~_It- ~~ ~ -- -:r-l~f;f-~f ~ ! 9~~0~!1L~ ~~~~~ , , \ ,..-:, \ --"\ ------ , ~ F:::--::-/ , . ;)1-/ '-- ()~ ~---- ~{\Dl':\Th) -ld M ~ , tS\f ur ' L, .)J" Z2--- ~.r\.A- ________.. ..----1"?---- h~ _________ //\,1.:.// ....///'-" //../.... ./../ Transportation and Traffic Englneenng PLANNING-OESIGN The TranSIIO Group August 19. 1996 TG 96290 00 Mr Jeff Kennedy 1\vin County Credit Union POBox 718 Olympia, WA 98507 SUBJECT: TWIN COUNTY CREDIT UNION -TRIP GENERATION STUDY Dear Jeff. The purpose of this letter is to describe the trip generation characteristics of the proposed Yelm 1\vin County Credit Union. This letter describes the results of a trip generation analysis conducted at existing 1\vin County Credit Union facilities in the Thurston and Pierce County area. The proposed Yelm 1\vin County Credit Union would be approximately 3.350 square feet (sO and would serve approximately 890 members. The remainder of this memorandum describes the data collection. analysis, and results of the trip generation study ITE Trip Generation Manual Generally. to estimate the traffic demand generated by a particular land use. traffic engineers utilize the Institute of Transportation Engineers (ITE) Trip Generation Manual. However, the ITE Trip Generation Manual. 5th Edition does not have a specific land use category for a Credit Union. The ITE Manual has a Walk-In Bank (Land Use 911), a Drive-In Bank (Land Use 912). and a Walk-In, and Drive-In Savings and Loan (Land Uses 913 and 914) All four land uses have limited data with the Drive-In Bank providing the most information however the data points are scattered for a variety of independent variables thereby yielding inconsistent and unreliable results. The trip generation rates for a Drive-In Bank and a Drive-In Savings & Loan differ significantly and widely across independent variables such as employees. number of drive-in windows, and building square footage. It is important to recognize that there is only one documented study for the Savings & Loan, and the trip rates for the Bank trip rate range from 3 0 to 242 5 trips per 1,000 gsf of building. Additionally, the trip generation to a Bank and/ or a Savings & Loan is affected by the surrounding land uses. traffic characteristics of surrounding roadways. accessibility. services offered (Le. Automated Teller Machines). etc. Since no reliable trip generation data for a Credit Union was available, studies of existing 1\vin County Credit Union facilities were undertaken to assess the trip generation characteristics of existing 1\vin County Credit Unions. Since both the Bank and Savings and Loan are significantly different than a Credit Union in that membership is restricted at a Credit Union versus the open banking policies at a Bank and/or a Savings and Loan, the trip generation study focused on traffic generated from a membership and transaction basis With restricted membership the Credit Union has fewer members to draw upon than a Bank or a Savings & Loan. The independent variables in the ITE Trip Generation Manual for Banks and Savings and Loans are building size, number of employees. and number of drive-in windows For a Credit Union, the membership at each branch is known and can be used as a predictor of the total number of transactions. which in turn can be used to assess the travel The TRANSPO Group Inc 14335 N E. 24th Street, SUite 201 Bellevue Washington 98007 FAX. 206/7473688 206/6413881 Ms. Jeff Kennedy August 19, 1996 Page 2 The Tra nSII 0 Group demand. The number of members is a more reliable variable for predicting traffic than any of the previously mentioned ITE variables since it is the membership that actually generates the traffic Data Collection and Analysis To establish a more refined estimate of trip generation characteristics of the Twin County Credit Union, transaction and traffic data were collected at existing Twin County Credit Union branch facilities in Thurston and Pierce County that have similar characteristics to the proposed Yelm branch. The traffic counts were conducted during the weekday PM peak hour on Wednesday August 14, 1996. No traffic count information was taken at the Tacoma Branch since it is not a self-contained branch like the Olympia and Lacey Branches. The attached worksheet shows the results of the trip generation analysis for the three branches studied. To arrive at a reasonable trip generation estimate. the total number of transactions during the weekday PM peak hour was compared to the total number of members at each branch that you provided. The total number of transactions per member during the weekday PM peak hour ranged from 0008 at Olympia and Tacoma to 0 019 at Lacey A comparison of the trip rates per transaction yielded trip rates from 1 85 to 1 96 trips per transaction during the weekday PM peak hour These trip rates are intuitive since generally one transaction would generate two auto trips assuming all single occupant vehicles. The slightly less than 2 0 trip rate (1 85 to 1 96) reflect the fact that not all visitors to the branch travel in single occupant vehicles. they may use transit, walk, or be a passenger in another vehicle. Since it is the Tacoma Branch that best replicates the membership base of that of the proposed Yelm Branch. the weekday PM peak hour transactions/member rate of 0008 was utilized Assuming a membership base of 890 for the Yelm Branch and a weekday PM peak hour transactions/member rate of 0008. a total of approximately 7 transactions is predicted to occur at the Yelm Branch during the weekday PM peak hour Applying the 1 96 trips per transaction that was observed at the Olympia Branch to the proposed Yelm Branch. a total of approximately 14 weekday PM peak hour trips are predicted for the proposed Yelm Branch based on the data collected at the existing 1\vin County Credit Union Branches. Trip Characteristics Of the total number of trips to a facility such as a Bank. three basic types of trips typically occur The three trip types are described below' 1 Pass-By Trips - These trips already exist on the roadways that provide primary access to the development and are being made for some purpose other than visit- ing the facilities (for example, work-to-home) Pass-by trips do not result in any increase in background traffic volumes in the study area. and therefore have no additional effect on the road system beyond the development's driveways 2. Diverted Trips - This category refers to trips attracted from the traffic volume on roadways within the vicinity of the generator but which require a diversion from that roadway to another roadway to gain access to the site. These roadways could include streets or freeways adjacent to the generator, but without access to the Ms Jeff Kennedy August 19, 1996 Page 3 The Tra nSII 0 Group generator Therefore. the diverted trip component of the total generated demand typically causes no change in the total number of vehicle trips within the overall road system of the area. This shift in traffic patterns through diversion often causes a net reduction in total vehicle miles traveled on the areawide transporta- tion system. 3 New (Primary) Trips - These trips are those that would not have been made with- out the existence of the proposed development. Therefore. this is the only trip type that results in an increase in the total number of trips made within the study area. These are also the only trips that represent additional vehicle miles of travel on the transportation system. For the purposes of the analysis for the proposed Yelm Twin County Credit Union. the pass-by trip components were assumed to 40 percent of the total trips. Although there is no specific information in the ITE Trip Generation Manual for trip characteristics of financial institutions, a trip to a Credit Union is typically part of another trip to and from a separate origin and destination. It is important to recognize that the majority of members at the proposed Yelm Branch are already being served by the existing Olympia and Lacy Branches. Thus, these Yelm Branch members who are utilizing existing Olympia and Lacey Branches would already be on the roadway as either a pass-by or diverted trip to the new Yelm Branch. Table 1 shows the estimated trip generation for the proposed Yelm Branch of the Twin County Credit Union. Table 1 Trip Generation Summary Weekday PM Peak Hour Trip Generation Proposed Credit Union Trip % Total Trips1 100% Pass-By/Diverted Trips 40% New Trips 60% Source. Traffic CountslTransaction Data - August 1996. PM Peak Hour 14 5 9 As shown in Table I, the proposed project is expected to generate a total of 14 weekday PM peak hour trips, with 9 of these being net new trips to the street system. We trust that this analysis provides the level of detail necessary for accurately estimating the trip generation from your proposed Yelm Branch. Please call me if you have any questions or comments regarding the analysis described in this letter Sincerely. The TRANSPO Group, Inc. ~R~aJ/f:!cftM- Senior Transportation Engineer Attachment \96290\96290L 1 Twin County Credit Union Tnp Generation Analysis Lacey - 1135 Bowker St TIME END IN OUT 4 15 17 23 4:30 22 21 4 45 15 20 5'00 22 23 5 15 15 25 5:30 14 18 545 2 8 6.00 2 2 No of Members = Transactions/Member = 4,695 0019 TOTAL 40 43 35 45 40 32 10 4 HOURLY TRANS TripfTrans 163 163 152 127 86 1 85 88 Olympia - 1020 E. 5th TIME END IN OUT 415 12 13 4:30 10 14 4 45 1 8 1 3 5:00 18 17 5 15 20 16 5:30 10 19 5.45 6'00 No of Members = Transactions/Member = 8,550 0008 TOTAL 25 24 31 35 36 29 Tacoma Branch No of Members = 1,383 Transactions (4 PM - 5 PM) = 11 Transactions/Member = 0 008 TRIPGEN.XLS HOURLY TRANS TripfTrans 115 126 131 67 1 96 The TranSIIO Group Dwin 6VlIJ1lJ2 CREDIT UNION August 21,1996 here to help you get ahead financially Catherine Carlson City of Yelm POBox 479 Yelm WA 95897 Re Proposed Twin County Credit Union Branch Dear Ms Carlson, Enclosed is a traffic scoping letter and independent trip analysis performed for us by Bruce Haldors, of the Transpo Group Any questions that you may have regarding the data provided can be directed to Mr Haldors at (206) 641-3881 He will be on vacation from August 22 through August 29, but can be reached either before or after those times I believe this is the only additional information you had requested in reviewing our site plan application for construction of a new branch at 1105 Yelm Avenue If you need any further information, please contact me at 357-9917, extension 402 (Siric;),.,eIY' ~!/ , / tu1 fLU/~ eff ',n e y Vice lesident Branc~ Administration TWIN COUNTY CRE1 IT UNION / oW OLYMPIA/ADMIN.- 2400 Evergreen Pk. Dr. SW Olympia, WA 98502 (360) 357-9911 FAX (360) 754-0646 o OLYMPIA 0 1020 E. Fifth Olvmpia, WA 98501 (360) 357-9911 FAX (360) 943-6105 - LACEY.- - ABERDEEN 0 o CENTRALlA - 1320 South Gold Centralia, WA 98531 1-800-235-8946 FAX (360) 736-3370 o TACOMA. 8904 5. Tacoma Way, Suite 1 Tacoma, WA 98499 (206) 581-9211 FAX (206)588-7028 1135 Bowker 51. 5E 401 E. Market Lacey, WA 98503 Aberdeen, WA 98520 (360) 357-9911 1-800-235-8946 FAX (360) 459-7896 FAX (360) 533-6707 Mail To' PO Box 718 · Olympia, WA 98507-0718