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E m xv 0.Bxowry Je. <br /> r 3 Fnn°A <br /> 0010 <br /> -MAmrew RCDP OLEZ <br /> Water Boards `/ ` <br /> Central Valley Regional Water Quality Control Bo <br /> � E® <br /> C`'EI <br /> Marc OlerJilt � t :��T6 13 June 2016 <br /> Senior Program Manager <br /> Shell Oil Products US ENViRONp,.AENrAI_HEALTIf <br /> US Remediation Group PERNT/SERVOES <br /> 308 Wilcox, No. 101 <br /> Castle Rock, CO 80104 <br /> SHELL PIPELINE 2016 RELEASE, 25705 PATTERSON PASS ROAD, <br /> TRACY, ALAMEDA COUNTY <br /> California Regional Water Quality Control Board, Central Valley Region (Central Valley Water <br /> Board) staff reviewed the 1 June 2016 Tracy 24"Pipeline Release 2016 Soil Sampling Work <br /> Plan (Work Plan) prepared by AECOM on behalf of Shell Oil Products US (Shell) for the 2016 <br /> pipeline release at 25705 Patterson Pass Road in Tracy (Site). On 20 May 2016, Shell reported <br /> a <br /> a release of unrefined crude oil from their 24-inch pipeline,which is buried seven feet <br /> underground, to the California Office of Emergency Services. Shell stopped the release and <br /> replaced the damaged pipeline and returned the pipeline to service. Shell has excavated <br /> petroleum contaminated soil from the area around the pipeline and placed it in bins. <br />' The Work Plan proposes excavating petroleum hydrocarbon contaminated soil at the Site. Shell <br /> proposes using a photoicnization detector(PID) to screen the limits of the excavation prior to <br /> collection of confirmation soil samples. Soil will be screened every 20 linear feet along the <br /> sidewalls and about every 400 square feet of the floor of the excavation. If soil contains visual <br /> evidence.of crude oil or fails the PID screening level of greater than 200 parts per million (ppm), <br /> additional soil excavation will be conducted until soil passes the PID screening level. If the soil <br /> passes the PID screening level, Shell will collect a soil confirmation sample and send it.to the <br /> laboratory for analysis. Soil confirmation samples will be analyzed for total petroleum <br /> hydrocarbons as crude oil (TPHc), benzene, toluene, ethylbenzene, and xylenes (collectively <br /> BTEX), and naphthalene. Shell proposes terminating the excavation at 20 feet below ground. <br /> surface (bgs) even if cleanup criteria are not met because of safety concerns. The current <br /> investigation shows visual impacts extend to a maximum of 18 feet bgs. Shell proposes the <br /> E following cleanup criteria: <br /> t <br /> Analyte Soil Criteria Soil Criteria <br /> a - from 0 to 5 feet bgs (mg/kg) Greater than 5 feet bgs (mg/kg) <br /> TPHc no silicagel) 5,000' 12,000 <br /> S Benzene 0.23 1.0 <br /> j Toluene 97002 4,600 <br /> Eth (benzene 5.1 22 <br /> Xylenes 5600222400 <br /> Na hthalene 3.32 143 <br /> Concentrations based on criteria for similar crude oil pipelines in the Central Valley Region <br /> s ESI-s for Residential direct soil contact(February 2016 Rev 3) <br /> ESI-s for Commercial/Industrial direct soil contact(February 2016 Rev 3) v <br /> n <br /> KenL E. LONOLEY SOD, P.E.,CHAIR I PAMELA G Cn_EDON P.E., ECEE, execu*Ive Cm CCR <br /> 11020 Sun Center Drive#200,RancM10 Cord°va,CA 95670 www.waterb°ards.ca.g°v/centralvalley <br />�j .ergs°,aven - <br />