Abrams AssociatesTRAFFIC ENGINEERING, INC.

1875 Olympic Boulevard, Suite 210 Walnut Creek, CA 94596 925.945.0201 Fax: 925.945.7966

April 26, 2018 Peter Chun, T.E. Associate Traffic Engineer Transportation Division – Public Works Department City of Berkeley 1947 Center Street, 4th Floor Berkeley, CA 94704

Re: Response to Comments on the 3000 Shattuck Avenue Mixed Use Project Draft Transportation Impact Analysis

Dear Peter, I received your latest comments and since they didn’t involve any adjustments to the calculations I figured some additional explanation was probably warranted to help explain why the numbers haven’t changed. Below is some additional discussion in response to each your comments: (1) Verify the Apartment Trip Rates. They do not match the 9th Edition ITE. I

verified the trip generation rates are correct, they did indeed change between the 9th and 10th editions of the manual. Attached to this letter are copies of the trip generation pages being referred to from the 10th Edition for your records.

(2) This is the ITE Code for a shopping center. We have traditionally used the shopping center category to estimate traffic for retail uses in Berkeley, mainly because there is no other ITE category for general retail uses that we can apply when a tenant hasn’t been selected yet. Please note that the only other comparable ITE general retail category is the “Specialty Retail” category (Land Use 826). However, this category has now been eliminated in the 10th Edition.

(3) Why did this number jump from 590 to 795? The trip generation of the existing gas station was only surveyed during the peak commute periods so the ADT shown in Table 4 was indeed estimated based on the peak hour volumes. Because you had commented on the source of the ADT I assumed there might be a concern with the current estimate so I reevaluated the ADT and decided to base it on the ITE trip rates in the 10th Edition. The AM Peak hour trip rate for a service station (Land Use Code 944) in the 10th Edition is 84.55 trips per hour and the daily rate is 1202.83 trips per day. To estimate the ADT from the counts I multiplied the existing AM peak hour trip generation by 1202.83/84.55 which yielded an estimate of 797 trips per day, which I then rounded to 795. Please be assured I am open to using a different methodology for this estimate if you have a different preference. For your

Abrams AssociatesTRAFFIC ENGINEERING, INC.3000 Shattuck Mixed Use Project TIA – Traffic Comments

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convenience I have attached the pages I’m referring to in the 10th Edition for a gasoline/service station. Also, please note the PM peak hour trip generation survey results for the gas station are now included the attached technical appendix.

(4) Pass-by for ITE Land Use Code 945 should be 60%, include the ITE Number. My review indicated that ITE Land Use Code 944 would apply to this project, but I am open to changing that assumption. In the 10th Edition of the manual Land Use Code 945 (Gasoline Service Station with Convenience Market) specifies the gross floor area of the convenience store should be between 2,000 and 3,000 square feet for this category to apply. The existing service station has a convenience store with well under 1,000 square feet. Therefore, the ITE category for a Gasoline/Service Station (ITE Code 944) appears to apply in this case because the description of this category specifies the service station should have a building with less than 2,000 square feet. Please note I estimate the existing building on the site to be approximately 1,500 square feet. By the way, not to confuse things, but I should mention that ITE added another category in the 10th Edition called Super Convenience Market/Gas Station (Land Use Code 960) which is for service stations with a convenience store over 3,000 square feet. For your convenience I have attached the all pages from the 10th Edition that I have referred to in this letter, including this new category. The ITE pass by rates for a Gasoline/Service Station (ITE Code 944) are 58% for the AM peak period and 42% for the PM peak period. It’s normally standard practice to select either the AM or PM peak hour pass-by rate and use it for both the AM and PM peak hours in the trip generation calculations, rather than use different AM and PM pass-by rates. In this case the PM peak hour was the critical hour at the study intersections so I elected to go with the PM peak hour pass-by rate for the analysis. However, if you believe a different pass-by rate would be appropriate, or if you want me to use separate rates for the AM and PM peak hours that’s no problem, just let me know.

Please call me if you have any questions about these comments.

Sincerely,

Stephen C. Abrams President Abrams Associates T.E. License No. 1852

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