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1.0 INTRODUCTION <br />On February 28, 1986 Southern Pacific Pipe Lines Inc. (SPPL) and <br />Arcady Oil Company met with representatives of various regulatory agencies <br />to discuss the status of emergency cleanup operations at the Arcady <br />drilling mud disposal site at Holt, near Stockton, California. During <br />agency discussions the Regional Water Quality Control Board (RWQCB), as the <br />lead agency, requested that SPPL assess the existing data and prepare a <br />work plan to further assess the extent of petroleum product migration and <br />the scope of any required remedial actions. The MARK Group (MARK) was <br />contracted by SPPL to prepare the work plan and, subject to their approval, <br />submit this document to the RWQCB on their behalf. <br />1.1 Background <br />On Sunday, February 23, 1986, Southern Pacific Pipe Line, Inc. (SPPL) <br />was informed of a suspected leak in the fuel pipeline connecting Stockton <br />to the Bay Area. A section of the underground pipeline passing beneath the <br />Arcady Oil Company waste mud disposal site at the town of Holt (located <br />about 70 miles east of San Francisco and 6 miles west of Stockton) was <br />apparently leaking. Floodwaters had breached the levees surrounding the <br />site and, together with rising groundwaters, had mobilized and dispersed <br />petra13tum fuels into the surrounding surface waters. <br />Following this event the Regional Water Quality Control Board ordered <br />an immediate investigation and cleanup of the affected area. SPPL and <br />Arcady Oil Company responded to the spill by immediately commencing a <br />cleanup ot nearby surface waters and constructing a bypass pipe system. IT <br />Corporation was contracted to perform emergency cleanup operations and The <br />MARK Group wEv,1 contracted to provide engineering and technical services for <br />data assessment and any long-term cleanup and remediation requirements. <br />1-1