_INSPECTION - C1981012 (48) - Laserfiche WebLink

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found in Exhibit 19, part 5 Miscellaneous Drainage Supplement, TR-30 dated 10/14/1993. The area is also mentioned in the Stormwater Management Plan in Exhibit 22 of the approved permit under Part 2, item #2 and in the table included in Part 5, item b. The area is not shown as an SAE on Map 12, West Portal Area — Roads, Utilities, and Facilities 3/24/2011 of the approved PAP. However, it is clearly an SAE given its topographic location and proximity to the Purgatoire River. The small flat reclaimed area at the end of the reclaimed road was found well vegetated with grasses and forbs. An infiltration gallery of large round rock was visible with willows and other vegetation invading the area. The road area appeared well vegetated, as well, along its entire length. No erosion or evidence of instability was noted. Contaminated Topsoil Area The contaminated topsoil area is the former location an area used to landfarm topsoil that was contaminated from a diesel spill that occurred near the East Portal Industrial building. Black plastic was laid down over an area of about '/ acre and topsoil was spread over the plastic to expose the soil to the air to allow volatile gas to escape and dissipate. The area was reclaimed and revegetated in 2003. A sediment demonstration in the form of modeling was found in Exhibit 19, part 5 Miscellaneous Drainage Supplement, TR-30 dated 10/15/1993. The area is inaccurately shown in both location and lacks identification as an SAE on Map 11, East Portal — Facilities, 4/22/2011 of the approved PAP. However, it is clearly an SAE given its topographic location and proximity to the Purgatoire River. The area is nearly perfectly flat and bounded by a berm on the north side, preventing runoff from entering the Purgatoire River. The area appeared moderately well vegetated with some shards of black plastic visible at the surface in places and at the edges. The plastic is decomposing and generally decrepit. No erosion or evidence of instability was noted. Topsoil Pile #2 and Bates Portals SAE The Topsoil Pile #2 and Bates Portal SAE for subsoil and topsoil is an area north of the river but south of Highway 12 just immediately west of the RDA conveyor. Currently, only topsoil pile No. 2 exists in this area as activities associated with the Bates Portal have only recently begun and active topsoil hauling and stockpiling for current activities has not yet occurred. When fully constructed, the area will be about 1.8 acres of topsoil and subsoil storage. A sediment demonstration in the form of modeling was found in Exhibit 19, part 5 Miscellaneous Drainage Supplement. The area is also mentioned in the Stormwater Management Plan in Exhibit 22 of the approved permit under Part 2, item #3 and in the table included in Part 5, item b. The area is shown as an SAE on Map 11, East Portal — Facilities, 4/22/2011 of the approved PAP. More recently, permitting under TR-55 has added permit text narrative on page 2.05-23 of the approved PAP discussing removal and storage locations and volumes related to Bates Portal construction. The operator will add about 1900 cubic yards of topsoil to topsoil pile no. 2 and construct a subsoil pile (subsoil stockpile No. 1) of about 4800 cubic yards west of topsoil pile no. 2. Sediment demonstrations are included in Exhibit 19 on page EXH. 19(16)- 1. Specific sediment control measures (berm and silt fence at low points) are specified under item #8 of this page and the location of these measures is shown on Map 11. Existing topsoil pile No. 2 was found well vegetated with a minor amount of runout of topsoil noted around the pile perimeter, especially on the steeper south-facing side of the pile. A berm is in place on the down gradient side to the west prior to a clean water ditch that diverts clean water from the north to the Purgatoire River. No significant erosion or evidence of instability was noted. 6