magellan midstream partner lp say tuesday investigate cause nearly 11,000-barrel gasoline spill two above-ground fuel storage tank houston-area terminal texas hurricane harvey leak galena park terminal big spill report far relate storm unleash record flood state late august destroy home kill score people environmental protection agency say federal state authorities respond spill link harvey dozen industrial facilities exact cause tank failures investigation magellan spokesman bruce heine say say company believe relate flood magellan clean much spill recover undisclosed amount escape terminal property nearby ditch houston ship channel heine say clean-up activities facility continue currently remove replace affect soil say spill occur aug. 31 heine say magellan initially report small volume gasoline spill state authorities adjust estimate upward able make full assessment say magellan long-term practice conservatively report product release appropriate agencies local authorities soon become aware potential incident say explain small initial estimate word wait absolute confirmation want give early possible notice magellan say much rest infrastructure return normal storm magellan midstream probe big texas fuel spill harvey flood