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WebKM VISION THAT MOVES YOUR COMMUNITY TECHNICAL MEMORANDUM Date: November 22, 2021 To: Jeffrey Levers, San Joaquin County Project No.: 094-135 Pock Lane TIS From: Arthur Chen and Chris Kinzel, TJKM Jurisdiction: San Joaquin County Subject: Pock Lane TIS VMT Analysis Memo TJKM conducted a VMT (Vehicle Miles Traveled) analysis for the proposed Pock Lane residential project. The project is located southeast of the city of Stockton in the unincorporated Kennedy community. Within the Pock Lane development, there are two subdivisions, 108 single family units development on the west side of Pock Lane and 96 single family units development on the east side of Pock Lane for a total of 204 units. For VMT forecasting, the San Joaquin County Transportation Analysis Guidelines (September 2020, page 14) recommends that the estimated VMT for a proposed project be obtained by inserting the proposed project into the San Joaquin COG 2018 RTP Model. Since the project is not screened out from the maps in the SJ County Transportation Analysis guidelines, a base year plus project model run was performed. The Pock Lane project is located in TAZ #2071 of the model. Currently, TAZ #2071 currently has 388 households with 1,095 population coded in the base year model.The project will add a total of 204 housing units with a population of 576. The residents to household ratio of 2.82 was determined using the existing ratio within TAZ#2071. Table 1: Land Use Changes for Base Year TAZ Households Population Single Family Dwelling Units 2071 +204 +576 +204 The SJCOG model calculates home based VMT totals from two categories; home based work and home based other VMT. TAZ#2071 contains two elementary schools totaling 1,360 students. TJKM identified an issue with the SJCOG model that was treating school trips as work trips, thus significantly increasing the distance traveled for parents picking up and dropping off kids at school. For example, normally school trips are localized and their average distances are around 1 to 2 miles. The base year model was treating these school trips as work trips, and applying distances of up to 10 miles for each trip, making the home based other VMT for any particular TAZ with a school in it significantly higher than normal.The issue only affected TAZs that have schools coded within them. For San Joaquin County school TAZs comprises of only 4.5% of all zones. For regional model compliance, this model error does not affect overall air quality conformity nor does it affect roadway volume validation in a significant manner. 1