Agenda - 10-14-1993 - D 1 - Laserfiche WebLink

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safeguards and be designed to contain all runoff on site. The storage of liquid asphalt and diesel fuel has been planned with a number of back-up stages to eliminate potential environmental impacts. The storage tanks will be above-ground, mounted on a concrete pad and surrounded by a concrete containment wall capable of holding the contents of all the tanks at once. The pad will be shaped to direct all internal flows to a concrete sump so that any spilled fuel materials may be removed. Small amounts of fuel would pass on to the oil/water separator described below, and large amounts could be pumped from this same pipe. The fuel storage area is planned to contain a worst-case spill (the case that all tanks are completely full and then completely emptied by accident). However, since some tanks are only filled weekly, and some only twice monthly, the retention volume of the containment structures provides more than enough capacity. In front of the fuel storage area will be a large concrete pad on which fuel trucks will park while filling the tanks, and where oil changes on equipment may be performed. Any spills in this area would pass to a sump, and then be sent to the oil/water separator. All petroleum products from the separator will be put in a waste-oil tank which will have its contents regularly removed from the site. The clean water from the separator will be placed in a pond containing two devices to protect against oil pollution. The first, an inverted siphon, will allow water from under the pond's surface to be discharged to a settling basin, thereby preventing any oil on the surface of the pond from flowing out. Additional precautions against contamination of this pond involve the placement of oil-absorbing materials on the pond surface to take up any oil on the surface These materials will be collected regularly and disposed of away from the site. The entire area in which fuels and asphaltic materials will be stored, processed, and handled will be graded so that natural surface flows will be directed to the pond described above. The two methods described above will remove any oil which might enter this pond. The clean water from this pond will pass through an inverted siphon to a sedimentation basin which will hold any soil which might be present in the runoff water. This basin will be protected from having oil enter rt. therefore, no liner is needed. During periods of high rainfall runoff, any clarified overflow from this sedimentation basin will be discharged to a tributary of Phil's Creek. 2.2 Alternatives Chosen for Further Study The No Action" alternative will be considered as a comparative base for the proposed action. Advantages of the "No-Action" alternative include no construction related cost to American Stone 2-6