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Home My WebLink AboutDIAMOND SHAMROCK CORNER STORE #1100 PUD - PRELIMINARY - 14-89 - SUBMITTAL DOCUMENTS - ROUND 1 - TRAFFIC STUDY (2)TRAFFIC IMPACT ANALYSIS PROPOSED SERVICE STATION/CONVENIENCE STORE WEST ELIZABETH STREET F E L S B U H H U T U E L E V I TRAFFIC IMPACT ANALYSIS PROPOSED SERVICE STATION/CONVENIENCE STORE WEST ELIZABETH STREET Prepared for: Diamond Shamrock 520 East 56th Avenue Denver, Colorado 80216 Prepared by: Felsburg Holt & Ullevig 5299 DTC Boulevard, Suite 400 Englewood, Colorado 80111 (303) 721-1440 March, 1989 FHU Project No. 89-011 TABLE OF CONTENTS Pace I. INTRODUCTION ............................ II. EXISTING CONDITIONS ....................... A. Existing Roadway Network .................... 44 B. Surrounding Land Use ........................ 4 C. Existing Traffic Volumes ................... 6 D. Existing Traffic Operations ................. III. TRAFFIC PROJECTIONS ....................... A. Trip Generation ....................• 10 B. Trip Distribution ..............••........... 10 C. Site Trip Assignment ...................... ' 10 D. Background Traffic Volumes ........•......... 13 E. Total Traffic Volumes ...................... IV. CAPACITY ANALYSES .......................... ...... 18 18 A. Year 1990 ........................... ........ 22 B. Year 2010 .............................. ..... V. Y AND RECOMMENDATIONS .........••••• SUMMARY ........ 26 APPENDIX - INTERSECTIONS LEVEL OF SERVICE LIST OF FIGURES Page 1. Site Location .......................... 2. Conceptual Site Plan ..................... 3. Existing Traffic Volumes ................. 4. Site Trip Distribution ...............•••• 5. Projected Buildout Site Generated 12 Traffic Volumes ............................ 6. Projected Year 1990 Background 14 Traffic Volumes ........................ 7. Projected Year 2010 Background 15 Traffic Volumes ........................ 8. Projected Year 1990 Total Traffic Volumes ........ 16 9. Projected Year 2010 Total Traffic Volumes ....... 17 10. Year 1990 Intersection Geometrics and ..... 21 Levelof Service ............................ 11. Year 2010 Intersection Geometrics and ••••••• 25 Levelof Service .......................... LIST OF TABLES Pacte 1. Summary of Level of Service Analysis: 7 Existing Conditions ............................. 2. Site Trip Generation ...................... 3. 1990 Level of Service Analysis - 19 Background Traffic Conditions .................... 4. 1990 Level of Service Analysis - 20 Total Traffic Conditions ......................... 5. 2010 Level of Service Analysis - 23 Background Traffic Conditions .................... 6. 2010 Level of Service Analysis - 24 Total Trffic Conditions .......................... I. INTRODUCTION The Diamond Shamrock Refining and Marketing Company is proposing to develop a vacant parcel of land located on the south side of West Elizabeth Street, west of City Park Avenue in Fort Collins (see Figure 1). A fast food restaurant and manual car wash were previously pro- posed for this undeveloped parcel of land. The Carl's Jr. Res- taurant Site Traffic Impact Study, prepared by Matthew J. Delich, P.E. (revised in December, 1985) documented the traffic impacts associated with that previously proposed development and served as a source of information for this analysis. Presently the Diamond Shamrock Company is proposing to construct a service station/convenience store and drive through car wash on this site. In addition to the changed land uses, there have also been modifications to the internal circulation plan and access plans along the private access road on the west side of the property. As shown in Figure 2, the site is proposed to have four access locations. Primary access to the development would occur on the existing private access road as well as at the Chesterfields, Bottomsley and Potts (CBP) access onto West Elizabeth Street. Two access locations are proposed on the access road separated by approximately 100 feet. The northernmost access would align with the existing Taco Bell access approximately 50 feet south of the south curbline on West Elizabeth Street. Modifications to the existing CBP parking lot would be required to allow the proposed development to share the existing CBP access onto West Elizabeth Street. An emergency access easement is proposed between the service station/convenience store building and the drive through car wash. The easement would connect to the adjoining CBP and shopping center parking lot east of the proposed site. The proposed access plan would not require any new or additional accesses onto West Elizabeth Street, but would utilize the access_ locations that currently exist on this facility. This analysis includes the preparation of traffic projections and velopment and es on several specific associatedmpacts ssues which have been raised by the citysstaff several P in their preliminary review. 1 IF E L 8 1 U R 0 H 0 L T 0 U L L E v 6 PI-qIq North vj Laurel St. North Dr. ::South Dr. Figure 1 Site Location F E L 3 e U R 6 H 0 L T S ULLEYI 61 0 0g� 1 0 North W Elizabeth St. Super Shopper Emergency Access Easement Figure 2 Conceptual Site Plan 3 II. EXISTING CONDITIONS A Existing Roadway Network The primary streets in the vicinity of the proposed Diamond Shamrock development are West Elizabeth Street and City Park Avenue. West Elizabeth Street is an arterial with four through lanes, a center left turn lane, and bike lanes on each side of the street. City Park Avenue is a two-lane street that extends from Mulberry Street to south of West Elizabeth Street, where it curves east to Shields Avenue. Signal control exists at the intersection of West Elizabeth Street/City Park Avenue; all other accesses along West Elizabeth Street in the vicinity of the site operate under either STOP sign control or no control on the accesses. B. Surrounding Land Use ranges from Land use in the To the north across icinity of the eElizabeth Street is a devel- ntial to opment currently known as the Bull Farm. It is proposed to be a multi -use commercial development with a small residential compo- nent. West and east of the proposed site exist a fast food restaurant (Taco Bell) and a sit-down restaurant Mta(Chedor torfieldstments Bottomsley and Potts), respectively. e presently exist south of the undeveloped parcel of land. C Existing Traffic volumes Figure 3 illustrates existing daily and peak hour traffic volumes at the critical intersections in the vicinity of the site. The peak hour traffic counts at West Elizabeth/Access Road and West Elizabeth/CBP access intersections were conducted by Counter Measures, Inc., for Felsburg Holt & Ullevig in February 1989. Existing (1988) daily and peak hour traffic volumes documented in the CSU Bull Farm, Parcel D, December 1988 report by Matthew J. Delich, P.E. were utilized at the intersection of West Elizabeth/City Park. As depicted by these volumes, traffic on West Elizabeth during the AM peak hour is heavily oriented in the eastbound direction, but it is more evenly distributed between eastbound and westbound during the noon and PM peak hour on this facility. 4 F E L S B U R G H 0 L T & U L L E V I G -► 140/366/597 W. Elizabeth St. r1/53/22 640/393/426 + 1 r 0/28/17 1 m e1 vi \ \ O N P �D Taco Bell Access - 0/60/10 -� Taco Bell Access- 2/23/19--� 0 North 1 a 14 N N 1/605 (- 11/25/31/25/30 9000 �oM \\ ao .o a P \eD Op N .0 J f L L63/82/64 f- 41/43/60731 157/101/96 J 14 r- 640/435/427 "1 (" 648/552/440 3/8/ l6 y ,o 9100 75/57/61 , \:o nor \ N O m N Oh O 7 Y a C.B.P. Access U Legend AM/Noon/PM Peak Hour Volumes XXXX One Way Daily Volumes Figure 3 Existing Traffic Volumes D. Existing Traffic Operations utilizing existing intersection geometrics and the peak hour traffic volumes illustrated in Figure 3, the intersections for the private access road, CBP access and City Park Avenue with West Elizabeth Street were evaluated to determine the existing intersection operations. The critical movement analysis for unsignalized intersections and the planning method of critical lane technique (both documented in the 1985 Highway Capacity Manual) were used to determine the level of service at the ana- lyzed intersections. Table 1 summarizes the results of the level of service analyses; the worksheets and definitions of level of service are provided in the Appendix. As shown by Table 1, all critical intersections operate satisfactorily under existing conditions. Table 1 Summary of Level of Service Analysis: Existing conditions Level of Service Intersection Control Movement AM Noon PM Private Access Road/Elizabeth Stop NB Left Turn C D C NB Right Turn A A A WB Left Turn A A A CBP Access/Elizabeth Stop Combined NB Left Turn/ A A A Right Turn WB Left Turn A A C City Park/Elizabeth 2-Phase A A A Signal III. TRAFFIC PROJECTIONS To be consistent with the earlier work done on the Bull Farm development, two planning horizons were analyzed for the proposed Diamond Shamrock development: years 1990 and 2010. Furthermore, to test the full impacts of the proposed site, traffic demand was projected assuming that full buildout of the proposed project would be completed by 1990. A Trip Generation Trip generation attributed to the proposed site is summarized in Table 2. As noted, the daily trip generation estimate for the development is based on the customer projection data provided by Diamond Shamrock Company. Based on data published in "A Guide to Trip Generation Rates," Public Works, December 1985, the AM and PM peak hour were assumed to equal 6 percent and 12 percent, respectively, of the daily traffic. Utilizing the standard trip generation rates published by the Institute of Transportation Engineers the site would be projected to generate only 750 daily trips. Therefore, the trip generation estimates utilized in this study represent a very conservative approach. Noon peak hour trip generation estimates for this development were derived by utilizing the relationship between the existing total noon peak hour traffic volumes to the existing total PM peak hour traffic volumes on West Elizabeth Street in the vicinity of the site. Since the proposed service station/convenience store and car wash is likely to attract about half of its business from "passerby" traffic, vehicles already traveling past the site for other purposes (see ITE Trip Generation manual, 4th edition), it was assumed that the relationship between the two existing peak hour traffic volumes would give a reasonable estimate of noon peak hour characteristics. Thus, it was assumed that the noon peak hour trip generation for the proposed site would be approximately 80 percent of the PM peak hour trip estimates. Table 2 indicates that the proposed Diamond Shamrock development would generate approximately 1,250 daily trips with about 80, 120, and 150 trips occurring during the AM, noon, and PM peak hours. Although it has been mentioned that nearly half of the traffic generated by the proposed service station/convenience store and car wash could be assumed to be "passerby" trips, all trips generated by the proposed development were assumed in this analysis to be addi- tional traffic on the roadways; thus, no reduction for passerby trips were accounted for, thereby representing a worst case scenario. L Table 2 site Trip Generation AM Peak Hour Noon Peak Hour PM Peak Hour Daily Daily Rate Trips Rate Trips Rate In/Out Trips In/Out Land Use Rate Trips In/Out In/Out In/Out In/Out Service Station (1) 1,250 (1) 40/40 (2) 60/60 (1) 75/75 with Convenience Store and Car Wash (1) Daily rate as per site market estimates provided by Diamond Shamrock Company. Peak trips: AM = 6% of ADT, PM = 12% of ADT as per "A Guide to Trip Generation Rates," Public Works, December 1985, with 50/50 directional split. (2) Noon peak hour estimated to be 80% of the PM peak hour. T_ B. Trip Distribution Site trip distribution is based on several factors, including site location, specific surrounding land uses and background traffic volumes on West Elizabeth Street. Existing travel pat- terns and directional splits on West Elizabeth Street and the trip distribution percentages documented in the were .S.U. Bull used as Parcel D Site Access Study (see Figure 4) references to derive directional trip distribution percentages for the proposed Diamond Shamrock development. It was assumed that travel pattern characteristics and the roadway system in the vicinity of the proposed site would not significantly change between 1990 and 2010 and therefore, trip distribution patterns were assumed to remain consistent between these two years. C Site Trip Assignment the trip generation estimates and the directional Application of distributions identified previously results in a detailed site iuste generated trip assignment. traffic Fisure for5the AM, ates noon andbdout PMlpeak site generated hours. D. Background Traffic volumes In discussions with the City of Fort Collins staff it was recom- mended that future traffic volume forecasts documented in the CSU Bull Farm, Parcel D Site Access Study be used as the basis for background traffic volumes at the critical intersections along West Elizabeth Street in the vicinity of the site. Future traf- fic forecasts for years 1990 and 2010 were documented in this report at the intersections of Elizabeth/Access Road hours; these Eliza- beth/City Park Avenue for the noon and PM p eakvolumes represent full buildout of the Bull Farm development by 1990. The peak hour volumes at the West Elizabeth Street/Access Road intersection were adjusted to reflect the recent peak hour traffic counts performed in February, 1989 and the additional traffic from the Matador Apartments located to the south of the proposed site that would utilize the access road as an alterna- tive access in the future. It was projected that approximately 90 dwelling units from the Matador Apartments would use the access road. The preceding adjustments were carried through the other critical intersections along West -Elizabeth Street for both the noon and PM peak hours for each analysis year. 10