STATE OF CALIFORNIA, PETE WILSON, Governor

PUBLIC UTILITES COMMISSION
505 VAN NESS AVENUE
SAN FRANCISCO, CA 94102-3298

April 2, 1998

Dean Shauers, Project Manager
Pacific Pipeline System, Inc.
12201 E. Arapahoe Road, C10
Englewood, CO 80112

RE: Variance Request #61 - Eliminate the 2-minute idling restriction for project trucks as stipulated in Mitigation Measure A-7 for Segments 3 and 5

Dear Mr. Shauers:

We have reviewed the above-referenced variance request and approve a modified version of your request (a substantial increased time for idling instead of total elimination of the idling requirement), based on the following factors:

Table 1 - Emissions Resulting from Queuing

Emissions

Emission Rates

Emissions during Queuing3

Total Emissions

 

Idling1

Hot Start2

Idling

Hot Start

 

NOx

0.22 g/min

1.00 g/start

0.88 g

2.00 g

2.88 g

CO

0.67 g/min

4.11 g/start

2.68 g

8.22 g

10.90 g

ROC

0.27 g/min

0.80 g/start

1.08 g

1.60 g

2.68 g

1. AP-42, Volume II, Table 1.7.3
2. SCAQMD CEQA Manual, Table A9-5-K-4, CY 1997.
3. Assuming two 2-minute idling periods and two hot starts.

Table 2 - Idling Minutes

Emissions
Total Emissions
Idling
Emission Rate1
Minutes of Continuous Idling2

NOx

2.88 g

0.22 g/min

13.1 min

CO

10.90 g

0.67 g/min

16.3 min

ROC

2.68 g

0.27 g/min

9.9 min

1. AP-42, Volume II, Table 1.7.3
2. Assuming no net increase air quality impact.

- An idling restriction for project trucks of 10 minutes shall be implemented and enforced.

- All applicable mitigation measures for the project shall be implemented at the subject locations.

- Implementation of this variance in accordance with the provisions noted above shall be verified on a random basis by a CPUC/ANF Environmental Monitor.

Sincerely,

Andrew Barnsdale
Project Manager

 

cc: R. Borden, ANF
H. Rastegar, Aspen

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