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ALAMEDA COUNTY DEPARTMENT OF ENVIRONMENTAL HEALTH Certified Unified Program Agency(CUPA) 1131 Harbor Bay Parkway,Alameda, CA 94502-6577 Phone 510 567-6700;Fax 510 337-9335 SITE VISIT NOTES 5-26-2016—Alameda County Dept. of Environmental Health (ACDEH) site visit. RE: C00017267 (OES Control#: 16-2999; Shell Pipeline Company/pipeline crude oil release) Location: 25705 W. Patterson Pass Rd, Tracy, CA 95377 10:00 am— ACDEH representatives Susan Hugo, Chief; Eric Englehart, Supervisor; Corinne Lowe, Hazardous Materials Specialist are onsite for a scheduled meeting with Shell Pipeline Company representatives Marc Oler, Ray Fisher, Shell Spokeperson, Shell's consultant Joe Morgan III with AECOM (Project Director); and Kristin Shelton, Water Resources Control Engineer with the State Water Resources Control Board(SWRCB), Central Valley Region. The purpose of the ACDEH site visit is to gather information related to the release and remediation activities and to observe the on-going remediation activities. Ms. Hugo and Ms. Shelton confirm and verbally agree to ACDEH's referral to the Central Valley Region Water Board of the investigation and clean up oversight related to this Shell pipeline release in Tracy(referral letter dated 5/24/2016, emailed to Ms. Shelton on 5/25/2016). Ms. Shelton states case is open in Geotracker, and requested that any inquiries received by Alameda County be referred to Brian Newman at the Water Board. Ms. Shelton stated that she will include ACDEH in further correspondence and/or updates on the progress of remediation related to this site. Shell representatives provide an overview of the incident and current status, stating that Shell is transitioning today from emergency response to remediation activities. The impacted pipeline is the San Pablo Bay pipeline spanning from Bakersfield to Martinez. The pipeline failure/loss of pressure is said to been documented on 5/20/2016 at 12:36 am pacific time, and the pipeline was remotely shut down by 12:39am. Robert Marshall from Shell Pipeline Company made notification of the release to OES on 5/20/2016 at 2:21 am. Excavation and clean up started by 10:00am that day. It was determined the breach was located at the 3 o'clock position of the pipeline and was approximately 18 inches long. Pipeline is buried approximately 7 feet below ground surface and there is a parallel pipeline which had previously been fully decommissioned and capped. An 80 foot segment of the damaged pipeline was removed and replaced, and a 20 foot section including the breached area was sent for forensics testing to determine the cause of the breach. Investigation included"pot holing"the area to determine lateral and vertical extent of release. Contamination is estimated to have reached a maximum depth of 15 feet below ground surface. Excavation is actively underway to remove impacted soil and replace with clean backfill. Approximately 500 bins are being utilized for the collection of excavated contaminated soil, each holding a maximum of 18 cubic yards. Soil sampling of bins was being conducted on the day of ACDEH's visit. Testing includes TPH, crude, naphthalene, BTEX. Visually impacted soil is being screened with a photoionization detector, and soil measured as above 200ppm is being sampled for laboratory analysis. The pipeline is currently being purged, and Shell stated that the pressure in the pipeline is 40% of standard operation. Presently, the heavy crude is being displaced to the refinery, following this light crude and nitrogen will be used to purge the pipeline in order to prepare for the introduction of water for hydrostatic testing (approximately 12, 000 barrels of water). Shell representative confirms that this is the second failure for this pipeline within 8 months and is located approximately 1868 feet downgradient from a September 2015 release, which had remediation conducted under the oversite of the SWRCB. Property owner is The Griffith Family, who has been notified of the release. The owner has reportedly authorized native fill from the property to be utilized as backfill as excavation continues. Shell stated that the pipeline was installed in 1989. Federal regulations require maintenance of lines and retention of maintenance documentation. Cal Fire Office of the State Fire Marshall is providing oversight on the repair of the pipeline. GenInspNotes.form 11-24-03 N:LOP-CUPA-TEAWCUPATUPA Inspection Forms