Table 3-1 Summary of Storm Drain Outfalls

Transcription

1 Table 3-1 Summary of Storm Drain Outfalls Outfall Number Description 005 The drainage area associated with Outfall 005 is to the west of the plant adjacent to and north of Warehouse 2/3, and includes a solid waste storage area and the 115 kv switchyard. Drainage is through a grassed swale that receives runoff collected by a culvert and a catch basin prior to being discharged to Bailey Cove. The area is unpaved. This outfall will be removed following decommissioning. 006 The drainage area associated with Outfall 006 receives storm water from material handling, shipping and receiving, and storage areas. It is associated with the loading area of Warehouse 2/3, a portion of the Staff Building parking area, Service Building roof drains, yard drainage in the vicinity of the cooling fans north of the Fuel Building and the north (reserve) transformers. In October 2002 the Outfall 007 drainage area was tied into this system. The subarea includes both paved and unpaved areas and is drained through catch basins and a drainage culvert to a point discharge west of the plant and adjacent to Bailey Cove. This outfall will be removed following decommissioning. 007 The drainage area associated with Outfall 007 receives storm water from the immediate vicinity of the Containment Building. It is comprised of discharges from paved and unpaved areas as well as building roof runoff and groundwater from the vicinity of the Containment Building foundation. The drainage is collected by numerous catch basins and, since October 2002, discharges to Bailey Cove via Outfall 006. Prior to this date, discharges were into the diffuser forebay, which subsequently discharged offshore through a multi-port diffuser into Montsweag Bay. Several of the catch basins and the outfall were abandoned during decommissioning activities. 008 The area associated with Outfall 008 captures drainage from and the area of the plant along the southeastern fence line. Drainage is to a swale and ditch which empties to Montsweag Bay just south of the fence line. 009 The area associated with Outfall 009 captures drainage from the southeast portion of facility paved areas and roof runoff. The area includes a solid waste storage area (not used to date), the former spare transformer, and was an area used for unloading fuel and chemicals during plant operation. Drainage is to catch basins that discharge to a single outfall located south of the former Circulating Water Pumphouse on the shoreline of Montsweag Bay. All but a single catch basin was abandoned during decommissioning activities and, following decommissioning, remaining catch basins will be abandoned and the outfall will be removed. 010 The drainage area associated with Outfall 010 receives storm water from paved and unpaved areas along the east side of the Plant in addition to the former Turbine Hall and the Administrative Building roof drains. Drainage is to catch basins that discharge to a single outfall located north of the former Circulating Water Pumphouse on the shoreline of Montsweag Bay. Located in this area were the main transformers and the security gate, where transport vehicles are held for clearance prior to plant entry. This outfall will be removed following decommissioning. 011 The drainage area associated with Outfall 011 captures drainage from paved roadways leading to the facility northeast of the former Turbine Hall behind the former Information Center. Other drainage includes a groundwater foundation drain and a Staff Building tunnel floor drain. Drainage is to catch basins that discharge to a single outfall located on the shoreline of the Back River. This outfall will be removed following decommissioning. 012 The drainage area associated with Outfall 012 receives storm water from the former Information Center paved parking lot and main access road. Drainage is to catch basins that discharge to a single outfall located on the shoreline of the Back River. N12 Outfall N12 is an earthen swale that receives runoff from a portion of Parking Lot C and the Information Center Parking Lot. 013 The drainage area associated with Outfall 013 captures runoff from the gravel parking lot associated with the public boat launch in the northeast corner of the area. The drainage swale leads to the Back River. 014 Outfall 014 receives drainage water from the ball field area in the northwest corner of the Bailey Point area and drains to Bailey Cove. Page 1 of 2

2 Table 3-1 Summary of Storm Drain Outfalls Outfall Number Description 015 Outfall 015 captures drainage water from the area around the ball field and access road near the railroad tracks in the northwest corner of the area and drains to Bailey Cove. 016 Outfall 016 receives drainage water from the wetlands and pond north of the ISFSI and drains to an intertidal area of Bailey Cove west of ISFSI. 017 The drainage area associated with Outfall 017 captures runoff from an area around the ISFSI SOB. Drainage is by a catch basin to a single outfall adjacent to an unnamed drainage swale. The 345 kv Switchyard is located in this area, but its drainage is sheet flow overland to the adjacent environment. 018 The drainage area associated with Outfall 018 receives storm water from the ISFSI. Specifically, draining the area surrounded by the ISFSI berm and future SOB parking area. This area discharges to the intertidal area of Bailey Cove. Page 2 of 2

3 Pre-RFI Selected Explorations Stratigraphy OW Clay Fill OW Clay-Silt OW Sand OW Rock OW Fill OW Clay-Silt OW Sand OW Rock Fill Clay Fill Clay-Silt Sand Rock Fill Clay Fill Clay-Silt Sand Rock Clay-Silt Sand Rock Fill Shot Rock Fill Clay Fill Clay-Silt Sand Clay-Silt Rock Fill Shot Rock Fill Clay Fill Clay-Silt Sand Rock Fill Shot Rock Fill Clay Fill Clay-Silt Rock Fill Page 1 of 11

4 Pre-RFI Selected Explorations Stratigraphy Clay Fill Clay-Silt Sand Rock OW Fill OW Clay Fill OW Fill OW Clay-Silt OW Sand OW Rock B Fill B Rock B Fill B Rock B Fill B Rock B Fill B Rock B Fill B Rock B Clay-Silt B Rock B Fill B Rock B Sand B Rock B Fill B Rock B Clay-Silt B Rock B Clay-Silt B Sand B Rock 21 1 B Clay-Silt B Rock B Clay-Silt B Rock B Fill B Rock B Clay-Silt Page 2 of 11

5 Pre-RFI Selected Explorations Stratigraphy 4 B Rock B Clay-Silt B Rock B Clay-Silt B Rock B Clay-Silt B Rock B Sand B Rock B Fill B Rock B Clay-Silt 23 5 B Rock 5-15 B Clay-Silt B Till B Rock B Fill B Rock B Clay-Silt B Rock B-1E Fill B-1E Rock B Fill B Clay-Silt B Rock B Clay-Silt B Rock B Fill B Clay-Silt B Rock 5-46 B Clay-Silt B Rock B Clay-Silt B Rock B-203A Fill B-203A Clay-Silt B-203A Rock B Clay-Silt B Rock B-204A Fill Page 3 of 11

6 Pre-RFI Selected Explorations Stratigraphy 4 B-204A Rock B Fill B Rock B Clay-Silt B Rock B Fill B Rock B Clay-Silt B Rock B Clay-Silt 18-5 B Rock B Clay-Silt 18-3 B Rock B Clay-Silt B Rock B Clay-Silt B Rock B Clay-Silt B Rock B Fill B Rock B Clay-Silt B Rock B Clay-Silt B Rock B Clay-Silt B Sand B Clay-Silt B Rock B Clay-Silt B Rock B Clay-Silt B Rock B Clay-Silt B Rock B Clay-Silt B Rock B9A Clay-Silt B9A Rock BK Fill Page 4 of 11

7 Pre-RFI Selected Explorations Stratigraphy 4 BK Rock BK Fill BK Clay-Silt 12 1 BK Sand BK Rock BK Fill BK Sand BK Rock BK Fill 21 4 BK Sand BK Rock BP-GPO Clay-Silt BP-GPO Rock BP-GPO Clay-Silt BP-GPO Rock HB Clay-Silt HB Rock K Fill K Clay-Silt K Rock K-2D Fill K-2D Clay-Silt 17-7 K-2D Sand -7-8 K-2D Rock K-3D Fill K-3D Clay-Silt K-3D Sand K-3D Rock K-4D Fill K-4D Clay-Silt 14-1 K-4D Sand -1-2 K-4D Rock P Clay-Silt P Rock P10A Clay-Silt P10A Rock P10B Clay-Silt P10B Rock P-10D Clay-Silt 35-2 P-10D Rock Page 5 of 11

8 Pre-RFI Selected Explorations Stratigraphy 4 P11B Clay-Silt P11B Rock P-11D Clay-Silt P-11D Rock P12B Clay-Silt P12B Rock P-12D Clay-Silt P-12D Rock P-13D Clay-Silt 26-6 P-13D Rock P-14D Clay-Silt P15B Clay-Silt P15B Rock P-15D Clay-Silt P16B Clay-Silt P16B Rock P-16D Clay-Silt P17B Clay-Silt P17B Rock P18B Fill P18B Clay Fill P18B Fill P-18D Fill P-18D Clay Fill 29 8 P-18D Clay-Silt 8-17 P-18D Sand P-18D Rock P Clay-Silt P Rock P19B Clay-Silt P19B Rock P1A Clay-Silt P1A Rock P1B Clay-Silt P1B Rock P-1D Clay-Silt P-1D Rock P Clay-Silt 21-6 P Rock P20B Clay-Silt Page 6 of 11

9 Pre-RFI Selected Explorations Stratigraphy 4 P20B Rock P21B Clay-Silt P21B Rock P22B Clay-Silt P22B Rock P23B Clay-Silt P23B Rock P Clay-Silt P Rock P2A Clay-Silt P2A Rock P2B Clay-Silt P2B Rock P2C Clay-Silt 26 6 P2C Rock P-2D Clay-Silt P-2D Rock P Clay-Silt P Rock P Clay-Silt P Rock P3A Clay-Silt P3A Rock P3C Clay-Silt 23 1 P3C Rock P-3D Clay-Silt 28 9 P-3D Rock P Clay-Silt P Rock P Clay-Silt P Rock P4A Clay-Silt P4A Rock P4B Clay-Silt P4B Rock P4C Clay-Silt P4C Rock P-4D Clay-Silt 25 2 P-4D Rock P Clay-Silt Page 7 of 11

10 Pre-RFI Selected Explorations Stratigraphy 4 P Rock P Clay-Silt P Rock P5A Clay-Silt 21 9 P5A Rock P5C Clay-Silt P5C Rock P-5D Clay-Silt 24-5 P-5D Rock P Clay-Silt P Rock P Fill P Rock P Clay-Silt P Rock P Clay-Silt P Rock P Clay-Silt P Rock P Clay-Silt P Rock P6B Clay-Silt P6B Rock P-6D Clay-Silt P-6D Rock P Clay-Silt P Rock P Clay-Silt P Rock P Clay-Silt P Rock P Clay-Silt P Rock P7A Clay-Silt P7A Rock P7B Clay-Silt P7B Rock P-7D Clay-Silt P-7D Rock P8A Clay-Silt Page 8 of 11

11 Pre-RFI Selected Explorations Stratigraphy 4 P8A Rock P8B Clay-Silt P8B Rock P-8D Clay-Silt 27-1 P-8D Rock P Clay-Silt 21 5 P Rock P9A Clay-Silt P9A Rock P9B Clay-Silt P9B Rock P-9D Clay-Silt P-9D Rock T-28U Clay-Silt T-28U Rock T-29C Clay-Silt T-29C Rock T-45A Clay-Silt 18 7 T-45C Clay-Silt T-45C Rock T-46C Clay-Silt T-46C Rock TB Clay-Silt 21 9 TB Rock TB10B Clay-Silt TB10B Rock TB11A Clay-Silt TB11A Rock TB11B Clay-Silt TB11B Rock TB12A Clay-Silt TB12A Rock TB12B Clay-Silt TB12B Rock TB13A Clay-Silt TB13A Rock TB13B Clay-Silt TB13B Rock TB14A Clay-Silt TB14A Rock Page 9 of 11

12 Pre-RFI Selected Explorations Stratigraphy 4 TB14B Clay-Silt TB14B Rock TB1B Clay-Silt TB1B Rock TB1C Clay-Silt TB1C Rock TB-1D Clay-Silt TB-1D Rock TB Clay-Silt TB Rock TB2B Clay-Silt TB2B Rock TB2C Clay-Silt TB2C Rock TB-2D Clay-Silt TB-2D Rock TB Clay-Silt TB Rock TB3B Clay-Silt TB3B Rock TB3C Clay-Silt TB3C Rock TB-3D Clay-Silt 21-3 TB-3D Rock TB Clay-Silt TB Rock TB4B Clay-Silt TB4B Rock TB4C Clay-Silt TB4C Rock TB-4D Clay-Silt 26 3 TB-4D Rock TB Clay-Silt TB Rock TB5B Clay-Silt TB5B Rock TB5C Clay-Silt TB5C Rock TB-5D Clay-Silt TB-5D Rock Page 10 of 11

13 Pre-RFI Selected Explorations Stratigraphy 4 TB6B Clay-Silt TB6B Rock TB-6D Clay-Silt TB-6D Rock TB7B Clay-Silt TB7B Rock TB8B Clay-Silt TB8B Rock TB9B Clay-Silt TB9B Rock TP-1E Fill TP-1E Rock TP-2E Fill TP-2E Rock Notes: 1. See Table 5-2 in QAPP (Stratex, 2001d) for installation date. Some data from Table 5-2 is corrected here. 2. Northings and Eastings are Maine State Grid Coordinates, East Zone, NAD 1927, in feet. Not all locations were surveyed and coordinates were obtained from scale drawings. 3. All depths in feet below ground surface (bgs). Where rock thickness is defined as 0.1 foot, the original boring log indicated Refusal. 4. Simplified Stratigraphic Descriptions by Robert G. Gerber, C.G. 5. All elevations in feet referenced to NGVD, 1929 Mean Sea Level. Page 11 of 11

14 Table 3-3 Vertical Gradient Direction in Paired Wells Well Number Measured Elevation 1 12/11/01 Direction Movement 12/11/01 Measured Elevation 1 4/01/02 Direction Movement 4/01/02 Measured Elevation 1 9/16/02 Direction Movement 9/16/02 Measured Elevation 1 11/13/02 302A upward upward 302B NM 2 303A NM 303B NM 304A NM 304B NM 305A NM upward upward upward 305B NM 401A NI 3 NI B NI NI A NI NI upward 406B NI NI A NI NI NM B NI NI A NI NI B NI NI A NI NI NI B NI NI NI A NI NI B NI NI A NI NI 29.1 NM 424B NI NI 29.5 NM Direction Movement 11/13/02 upward Notes: 1. Elevations in feet referenced to NGVD 2. NM Water level Not Measured 3. NI Monitoring well Not Installed