Inland Marine Services Group

ASI Marine Services Group has grown out of serving the expanding needs of our clients. We have skilled commercial dive teams for inspections, underwater construction, gate and valve work and a wide range of other needs. Our commercial dive crews are mobile and carry with them the most modern equipment and tools to meet nearly any project requirement.

Underwater expertise includes but is not limited to:
• Outlet works rehabilitation
• Trashrack design, fabrication and installation
• Inspections/video documentation
• Concrete placement
• Coatings and anode replacement
• Salvage, recovery and demolition
• Burning and welding
• Sheetpile installation and removal
• Cofferdam installation and removal
• Pipeline installation, inspection and repair
• Remote Operated Vehicle (ROV) operation

Some of our Inland Marine Services projects are found here.

Ames Hydro Trout Lake Valve House Location: Telluride, CO Completion Date: 04/10 Owner: Xcel Energy The project included Diving Services for inspection of a wooden framed elevated building housing the motor operator for a 36 inch sliding gate valve and reservoir level indicator. The elevated building is supported off of a submerged concrete foundation. The 36 inch sliding gate valve is mounted to the inside wall of the concrete foundation and feeds water into a 42 inch outlet pipe that passes through the dam embankment. The reservoir surface was covered with ice and access to the water was from the embankment. The diving was conducted in 20 feet of water at a land elevation of 10,400 feet. The inspection recorded to DVD and was viewable live during the inspection thereby providing a direct interaction between the client and the Diver. The inspection documented the following: Condition of the concrete and physical dimensions of the concrete foundation; Trash rack configuration, dimensions and condition, including measurements of typical bar sizes and spacing; Type, size, condition and mounting assembly of 36 inch sliding gate valve if accessible; Condition of 42” outlet pipe; Measurement and evaluation of sediment.
Design And Installation Of New Trashracks And Control Tower Ladder At New Fork Lake Location: Pinedale, WY Completion Date: 10/09 Owner: Pinedale, WY Project entailed removal of old steel trashracks by using underwater torch for cutting the steel bars. The new trashracks were ASI designed to fit the existing intake structure without any modifications to the intake. A new stainless steel ladder was installed in the dam control shaft to make access into the shaft OSHA compliant.
1 MG Welded Steel On-Grade Potable Water Tank Inspection Location: Guernsey, WY Completion Date: 10/09 Owner: Wyoming National Guard Exterior and underwater interior inspection of a Steel Welded on-grade potable water reservoir. ASI divers completed an interior video inspection of a welded steel on-grade potable water storage reservoir. Work included inspection and documentation of the floor, wall panels, roof structures, man-ways and columns. support system and roof panels, inlet/outlet The team also performed a thorough exterior inspection documenting results with high quality digital still photos. All information and results were presented to the Owner in a bound Inspection report.
Dog River Dam Emergency Flood Repairs Location: Douglasville, GA Completion Date: 11/09 Amount: $80,000 Owner: Douglas County Water And Sewer Authority In September of 2009 flooding occurred at the Dog River Dam in Douglasville, GA where 10’ of water was flowing over the dam Parapet wall. Extensive damage occurred to gate stems and hoists on two 60” sluice gates. Our divers had to complete underwater gate repairs to the seals, replace the stems and manual operators for both gates. Dive work was staged from a barge platform with crane support. Working depths were approximately 24’.
Catawba Intake Structure Dive Support Location: Charlotte, NC Completion Date: Amount: $283,000 Owner: Duke Energy Corporation Work included supporting Duke Energy’s Diving Contractor with crane and personnel support for installation of a steel bulkhead (10’ h x 15’ w). The bulkhead was anchored over the existing dam outlet on the upstream side of the dam. A 36” diameter x 40’ long intake pipe was flanged to the bulkhead and a 10’ x 10’ trash rack structure was installed on the end of the new intake pipe. ASI personnel were responsible for fabrication and field modifications to the new steel intake as well as operating the crane for installation/removal purposes.
Eucha Dam Location: Tulsa, OK Completion Date: 06/09 Owner: City Of Tulsa Engineer: URS Corporation The Eucha Dam was built in 1950 as an additional municipal water supply for the City of Tulsa. The structure consists of an approximately 593-foot-long earth embankment structure located at the right abutment and an approximately 1,473. 5-foot-long concrete gravity dam. The concrete gravity dam section has 1,000-foot-long uncontrolled spillway at elevation 778 feet, a 211.5-foot-wide gated spillway section, and two non-overflow sections. The gated spillway section consists of five radial gates, each 36 feet wide by 23 feet high, whose minimum elevation is 760 feet. The dam rises 95 feet above the original streambed and has a maximum impoundment capacity of 120,000 acre feet (ac-ft). The lake has a surface area of 2,880 acres (ac) at normal pool elevation, and about 4,365 ac at the top of the dam. Maximum storage volume above the uncontrolled spillway is 53,631 ac-ft. The scope of work for the dive inspection included inspecting the upstream face of the dam to map any cracking and to assess the condition of the concrete underwater; measuring the sediment depth; taking photographs and video the upstream dam face; mapping locations of possible seepage areas and cracks; and preparing a report describing the condition of the upstream face and other exposed appurtenant structures.
Dog River Dam Modifications Location: Douglasville, GA Completion Date: 04/09 Amount: $350,000 Owner: Douglas County Water And Sewer Authority Diving to 20’ for the the installation of large steel cofferdams to dewater bays in a labyrinth spillway. The divers are responsible for fabrication of 15’ x 20’ and 15’ x 30’ long steel cofferdams. Project entails raising spillway 10’ in elevation to gain storage capacity in reservoir. Project also involves vegetation removal around entire perimeter of reservoir. Raising of dike walls, installation of concrete cutoff walls. Installation of 60” bypass piping including installation of 60” slide gates with manual operators. Other diving on the project includes installation of trash rack over intake structure.
Diving Services for Replacing Gate Packing At Milton Seaman Reservoir Location: Greeley, CO Completion Date: 11/08 Owner: City Of Greeley, CO The work for this project involved providing equipment and divers for the underwater maintenance of three hydraulic gate cylinders. The cylinders are located in a concrete framed inlet structure with steel grating in the openings. The concrete structure has inside dimensions of approximately 30 ft X 30 ft X 22 ft high. Entrance into the structure was through a removable steel grate opening. The work included removing an adjustable bushing and the existing packing material from the bottom of three of the five hydraulic cylinders. We then installed new packing material and reassembled the bushings. All work was completed under 45 feet of water. The water temperature was about 40 Degrees F with an air surface temperature ranging from 14 degrees F in the mornings up to 60 degrees F in the afternoon. Each diver had about 50 minutes of bottom time per dive.
Clearing Of Mud And Debris From Intake Bay Bulkhead Slots Location: Northern Colorado Completion Date: 09/08 Owner: Northern Colorado Water Conservancy District Diving to 40’ at 7,000’ elevation for the purpose of clearing mud and debris from 4 intake bays at a pumping plant. Sediment and debris removal completed using diver mechanical means.
Intake Tower Inspection At Bloomfield Lake Location: Bloomfield, NM Completion Date: 08/08 Owner: City Of Bloomfield, NM Engineer: URS Corporation Diving to 30’ at 5000’ elevation for Commercial Diving for the inspection of a steel intake tower at Bloomfield Lake, NM to determine structure integrity and also to determine the condition and sizes of outlet gates.
Tiber Reservoir Water Intake Location: Liberty County, MT Completion Date: 06/07 Amount: $1,843,000 Owner: Chippewa Cree Cronstruction Corp. Engineer: HKM Engineering The project required construction of a 28 foot diameter shaft, with a depth of 75 feet to facilitate a 42”x400’ MTBM drive for a ‘wet lake tap.’ A shaft was constructed via a contractor designed sunken caisson method where concrete construction was all performed above grade. An intake structure was installed underwater at depths of 50-60 feet.
Standley Lake Dam Rehabilitation Location: Westminster, CO Completion Date: 09/04 Amount: $30,649,208 Owner: City Of Westminster, CO Engineer: Joseph A. Cesare & Associates 72" diameter pipelines. Completed existing outlet works abandonment.
Tom Miller Modernization Project Location: Austin, TX Completion Date: 09/04 Amount: $10,450,000 Owner: Lower Colorado River Authority Engineer: Freese Nichols Stability modifications to a concrete dam and spillway constructed in 1911. Installation of 55 post-tensioned tendon anchors in spillway crest and dam abutment in-water. Installation of 207 40-ft-long stitch anchors in a 30-ft-deep stilling basin. Demolition and reconstruction of 1,100 CY of concrete in the downstream deck slabs of five gate bays. Placement of 3,200 CY of mass fill tremie concrete in the hollow core sections of the dam. Placement of 600 CY of structural concrete fill in upper hollow section of the dam. All access upstream and downstream via barges.
Willamette Temperature Control Diversion Tunnel And Gate At Cougar Dam Location: Blue River, OR Completion Date: 03/02 Amount: $12,830,000 Owner: U.S. Army Corps Of Engineers Engineer: U.S. Army Corps Of Engineers Live wet lake tap. The project included machine excavation/enlargement of existing 12 ft tunnel to 16.75 ft; horseshoe x 950 ft length. Drill & blast gate chamber excavation within tunnel 20 ft x 32 ft x 65 ft mechanical excavation of 35 ft tunnel plug prior to tap required access through new gates, marine removal of underwater bulkhead and replacement with new bulkhead required mix-gas diving to 270-ft-depth and 150 ton barge mounted crane in reservoir. Placed 8,500 cy reinforced concrete tunnel lining; installed four high pressure bonneted slide gates 3 ft x 6 ft. The project also included temporary support of tunnel and portal, steel liner and transition placement, concrete backfill, and consolidation grouting, ring grouting, and skin grouting upstream of gate chamber. Work performed at existing rockfill dam 405-ft-high, crest length of 1,65 ft.
Construction Modifications At Jed Johnson Dam Location: Medicine Park, OK Completion Date: 07/01 Amount: $2,367,203 Owner: U.S. Fish & Wildlife Engineer: URS Corporation The project included wire saw cutting of between 1 ft and 5 ft of the existing top of the structural concrete dam; the installation of 43 post-tensioned anchors in large diameter cored holes; the replacement of 160 CY of concrete to top of dam; Installation of an upstream and downstream guard gate, the construction of a 900 LF moisture cutoff wall; and diver-performed installation of upstream gate and repairs to upstream surfaces. All work was performed at dam accessed and staged from barges. The dam is 50-ft-high with a crest length of 273 ft.
Modifications To Motts Run Dam And Appurtenant Works Location: Fredericksburg, VA Completion Date: 09/01 Amount: $3,488,700 Owner: County Of Spotsylvania, VA Engineer: Gannett Fleming Rehabilitation of an existing dam outlet works including replacement of two 10-inch gates with new 24-inch gates, constructing two thrust block walls within the intake tower, rehabilitating the 36-inch low-level sluice gate, injecting chemical grout in the existing 48-inch conduit, installing 700 LF of HDPE conduit liner in the existing 48-inch conduit, and refurbishing all misc. metals on the tower deck. Work included the excavation of the dam's toe for installation of a toe drain, along with pipe drains and a sand blanket drain on the downstream slope of the dam, approximately 25,000 tons of sand, approximately 20,000 CY of unclassified material will be excavated to form an emergency spillway and this material will then be placed to raise the overall height of the dam. A concrete sill will be constructed across entire length of emergency spillway. The dam is 97-ft-high with a crest length of 700 ft.
Wesley Seale Dam Spillway Rehabilitation Location: Corpus Christi, TX Completion Date: 04/01 Amount: $18,193,990 Owner: City Of Corpus Christi, TX Engineer: Freese & Nichols The project consisted of on-site producing, delivering, and placing of 72,000 CY mass concrete and 16,000 cy of conventional reinforced concrete to stabilize the existing dam structure. Work involved significant river diversion, cofferdam construction, extensive dewatering, and 700 drilled wells to relieve water pressure from beneath the structures. The project also included construction of subdrains, 45 multi-strand tendon anchors installed from floating plant; spillway gate rehabilitation and extensions; instrumentation; earthwork; roadwork; and a new administration building.

Inland Marine Services Group

Clearing Of Mud And Debris From Intake Bay Bulkhead Slots