337 ALASKA 2020 SECTION 622
622-1.01 DESCRIPTION . Construct one or more of the following rest area facilities at locations
shown on the Plans:
1.Sanitary facilities with screen fences
2.Wooden picnic tables and shelter houses
3.Litter can racks with litter cans, lids, and locking devices
4.Fireplaces
5.Well, casing (if required), pump cylinder, and hand pump assembly
6.Treated tim ber curb
7.Rest area signs
8.Litter barrels MATERIALS
622-2.01 GENERAL. Use only new materials that conform to plan details, or as specified.
622-2.02 GALVANIZING . Meet AASHTO M 111 or M 232. Repair damage to galvanized coatings
according to Subsection 716- 2.07.
622-2.03 HAND PUMP D RINKING FOUNTAIN. Use a sanitary drinking fountain pump stand
meeting details shown on the Plans. Provide a pump complete with an Ohio pattern base, stuffing box, air vent, and drainpipes. Use a brass or brass -lined pump cylinder wi th an inside diameter of 1-11/16 inch, 6- inch minimum stroke. Provide a plunger with two leathers. Thread the top and bottom of the cylinder to 2- inch pipe size. Use ball or spool valves. Tap the plunger valve to allow screwing to the top of the check valv e. Use a check valve designed to be withdrawn through the cylinder and drop pipe with the plunger. Use a check valve equipped with a cup leather similar to the plunger cup leathers.
622-2.04 WELL CASING S. Case the well with standard weight black or galvani zed steel pipe, 6 -
inch diameter, meeting ASTM A53.
622-2.05 WELL SCREEN S. Determine screen length, area, size of openings, and material after
exploring water -bearing strata and analyzing samples from the strata. The Engineer will approve screen criteria depending on thickness and uniformity of water -bearing strata, analysis of aquifer samples, well requirements, and the screen manufacturer’s recommendations. Obtain representative samples of sands and water in the aquifer. Take the sand sample after obtaining a satisfactory yield according to Subsection 622- 3.05. Submit the samples and a copy of the drilling log to the screen manufacturer. Give the Engineer copies of transmittals to and from the screen manufacturer. Use a final length of screen as recommended by the screen manufacturer and approved by the Engineer. Use the largest diameter that can be installed in the casing. Use a screen made of either silicon steel or stainless steel, based on chemical analysis of the well water. Screen must be strong enou gh to resist damage during installation and external force after installation. Do not change screen alignment after installation. Provide fittings of the same material as the screen needed to seal top of screen tightly to casing and to close bottom of screen. If screen is installed inside casing, provide a lead packer seal at top of screen with 12- inch minimum overlap of casing and screen. If screen is attached to casing, provide suitable coupling or weld screen to casing.
622-2.06 DROP PIPE. Use 2 -inch galvanized steel pipe with galvanized couplings meeting ASTM
A53. Ream the ends of the pipe before installation so that you can withdraw the pump rod and 338 ALASKA 2020 valves through the drop pipe. Drill a 1/8 inch diameter weep hole in the drop pipe below the frost level as shown on the Plans.
622-2.07 PUMP ROD. Use a minimum 3/8 inch galvanized rod on all installations up to 50 feet
deep. If the well is deeper than 50 feet, install first quality 1- 1/8 inch octagon ash wood pump rod with butt -type galvanized coupling to the nearest even length below the weep hole. From this point to the surface, use 1/2 inch galvanized rod as shown on the Plans.
622-2.08 LUMBER. Meet the requirements in Section 713.
622-2.09 TREATED TIMBER. Meet Section 714 and details on the Plans.
622-2.10 CONCRETE. Use Class W concrete meeting the requirements of Section 550.
622-2.11 LITTER BARR ELS. Use clean, rust -free and undamaged 55 gallon steel barrels with
tops removed and free of projections or sharp edges. Paint litter barrels highway orange and stencil “Litter” on both sides in white letters 5 inches high.
622-2.12 REST AREA S IGNS AND POSTS. Meet all applicable requirements of Section 615.
CONSTRUCTION REQUIREMENTS
622-3.01 GENERAL. Locate all specified rest area facilities approximately a s shown on the
Plans. Make minor location adjustments if topographic conditions dictate better placement.
622-3.02 CLEARING AN D GRUBBING. Clear and grub to conform to the applicable portions of
Section 201. Make every effort to retain the natural state of the landscape within the rest area. Do not damage natural ground cover.
622-3.03 GENERAL PAT HS. Construct all foot paths and picnic table areas with a gravel mat as
shown on the Plans, to the length and width as directed. Place, level, and compact material to a firm surface using mechanical compaction.
622-3.04 EXCAVATION. Make excavations for support posts, curbs, and screen fences large
enough to allow working space for tamping backfill. Dispose of excess excavated material away from the rest area.
622-3.05 Constructing W Ater Well.
1.General . Drill, develop, case, and test wells. Furnish and place all materials at the sites as detailed on the Plans. Procure all required permits, certificates, and licenses. Well depth shown on the Plans is approximate. The Department does not guarantee the presence of water at the anticipated depth. The exact depth will depend on adequate yield.
2.Protection of Site. Protect all structures, trees, shrubbery, etc., during the work. Remove from the site all cuttings, drilling s, debris, and unused materials. After completing the work, restore the site as nearly as possible to its original condition. Conduct water pumped from the well to a designated place where you can dispose of it without causing erosion or other damage to pr operty or creating a nuisance.
3.Bore and Casing . Drill the well straight, plumb, and large enough to receive the size of casing specified. Either weld or thread casing joints. Make the inside of the casing reasonably smooth and watertight. 339 ALASKA 2020 4. Boring Log . Keep an accurate log of all materials encountered and the depths at which the changes in the formations occur, together with other information as required. Take samples of the materials found in each stratum at intervals of 5 feet or less. Preserve samples in your own receptacles. Mark the samples plainly to show the depth below the ground surface at which the sample was obtained. Include full, descriptive notes of everything found during drilling and of all difficulties or unusual conditions. Describe all water bearing strata in detail. Indicate whether the material is loose or compact, what color it is, and, if the material is gravel, whether it is water -worn or angular. Note the presence of any clay. After completing the well, deliver one copy of the log and re sults of the yield test to the Engineer for transmittal to the State according to AS 41.08.
5.Protecting Water Supply . Take all precautions as directed or necessary to prevent contaminated water, or water with undesirable physical or chemical characteristics , from entering the stratum from which the well will draw its supply through the opening you made. Take all necessary precautions during construction to prevent contaminated water, gasoline, etc., from entering the well through the opening or seeping through the ground surface.
6.Corrective Work . If the well becomes contaminated, or if water with undesirable physical or chemical characteristics enters the well due to your neglect, perform corrective work at your expense. Supply casings, seals, sterilizing agents, or other necessary materials to eliminate the contamination or shut off the undesirable water.
7.Temporary Capping. At all times during the work, protect the well to prevent tampering or contamination with foreign matter. After completing the well, pro vide and set a substantial screwed or flanged cap at least 12 inches but not more than 24 inches above the normal ground surface, or as directed.
8.Developing and Testing.
a.Yield Test . After completing the bore or as directed, bail or pump to determine the yield. The Engineer will determine the approximate level of water in the well before and immediately after you complete the yield test. The desired yield is 4 gallons per minute with a sustained yield of 25 gallons per hour. Furnish, install, and operate equipment of approved size and type for measuring the flow of water and depth to the water level in the well. Use a suitable flow measuring device such as a weir box, orifice, or water meter. If the yield test is unsuccessful, allow 10 working days for the State to evaluate the geologic and hydrologic well data and decide on another course of action. After receiving approval for a satisfactory yield test, but before developing the well, take a water sample and submit it to the Alaska Department of Environmental Conservation for a bacteriological and chemical examination. Pay for all costs of samples and analysis.
b.Developing. After completing drilling, develop and clean out the well. Develop the well with a suitable surge plunger or other device designed to develop wells in the waterbearing formation you encounter. Develop to give the maximum practical yield of water per foot of drawdown. Develop to extract from the water -bearing formation the practical maximum quantity of such fine materials that may, during the life of the well, be drawn into the casing when the well is pumped under maximum drawdown conditions. After completing developing, remove all sediment to the full depth of the well. Your equipment and material remain your property; remove them at the end of the work. 340 ALASKA 2020 9. Grouting.
a.When the well is accepted, ream the upper 10 feet of the bore to a diameter at least 8 inches greater than the casing OD. Center the casing in this section and hold it in place with enough spacers to maintain true alignment. Pl ace grout in the area around the casing. Use grout consisting of 1 part portland cement and 3 parts sand mixed with only enough water to form a workable mix. Place the grout so that surface water and other impurities cannot infiltrate the well along the bore and casing. Use an approved grouting method. Force grout from the bottom of grout space toward the ground surface. Use a continuous grouting operation. Use continuous spacers of clean, durable material suitable for concrete aggregate.
b.Allow the grout to set for 3 days before doing any work that may disturb it or cause it to crack. Take care to protect the grout from damage and ensure proper curing during the 3-day setting period.
10.Abandonment of Well .
a.If water supply is not satisfactory, abandon the well . Plug the abandoned well bore with impervious material as required. Compensation for abandoning well bores and deleting other items of work necessary for completing the well and pump assembly will be made under Subsection 109- 1.05.
b.If you must abandon dri lling at one location and begin drilling at another because of your operations, or if you fail to complete a satisfactory well bore as specified or required, plug the abandoned bore as specified. No compensation will be made for any work performed at the abandoned site. Salvaged materials remain your property.
622-3.06 HAND PUMP A SSEMBLY. Install the well screen, drop pipe, pump rod, and cylinder as
detailed on the Plans. Set the pump plumb on the casing. Furnish and install the hand pump and all required miscellaneous hardware not specified or detailed so that the water system will operate properly. On the basis of the yield test, the Engineer will stipulate the depth to the bottom of casing and the depth to which you must set the pump cylinder. Construc t a concrete pump platform and drain as shown on the Plans.
622-3.07 DISINFECTIO N. After completing the pump assembly, disinfect the well. Use the
following amount for each 100 gallons of water in the well: Chlorinated Lime 2.5 teaspoons Chlorine Laundry B leach 1 pint HTH 12 tablespoons Mix the disinfectant with 5 gallons of water. Pour the disinfectant mixture into the well, down the sides of the casing and the drop pipe. Let the disinfectant stand overnight. Pump out the well until the water no longer tas tes of chlorine. Obtain sample bottles from the State Department of Health and Social Services. Collect water samples and submit them to their Public Health Laboratory for testing. If the sample does not meet Public Health requirements, disinfect again and draw more samples until results are satisfactory.
622-4.01 METHOD OF M EASUREMENT. See Section 109 and as follows:
Item 622.0004.____ Treated Timber Curb. By the length of curb, excluding gaps. 341 ALASKA 2020 Iem 622.0005.____ Well and Casing. By the length of casing installed or the depth of hole measured from the ground surface if the well is abandoned. Item 622.0006.____ Rest Area Signs . By the area of legend- bearing sign panel erected in place. No deductions will be made for corner rounding. Nominal dimensions for si gn sizes indicated on the Plans will be used to calculate sign pay quantities. Items 622.0007.____ through 622.0014.____ Rest Area Facilities . By the number of facilities completed and accepted.
622-5.01 BASIS OF PA YMENT. Excavation, backfill, grading, and cleanup are subsidiary.
622.0001.____ Rest Area . The contract price includes rest area site, all facilities, paths, and picnic areas. Clearing will be measured under Section 201. Subbase and borrow will be measured under Section 304 and 203 respectively. 622.0002.____ Water System Complete. The contract price includes well, casing, pumping facilities and all incidentals specified or required to complete the installation. Payment will be made under: PAY ITEM Item Number Item Description Unit 622.0001. ____ Rest Area LS 622.0002.____ Water System Complete LS 622.0003.____ Screen Fence LF 622.0004.____ Treated Timber Curb LF 622.0005.____ Well and Casing LF 622.0006.____ Rest Area Signs SF 622.0007.____ Pit Toilet, ___ Seat EACH 622.0008.____ Table , Class ___ EACH 622.0009.____ Litter Can with Rack EACH 622.0010.____ Fireplace, Class ___ EACH 622.0011.____ Special Vault Toilet EACH 622.0012.____ Shelter House, Case ___ EACH 622.0013.____ Hand Pump Assembly EACH 622.0014.____ Litter Barrel EACH 342 ALASKA 2020 SECTION 623 BLOCK SODDING
623-1.01 DESCRIPTION . Establish a perennial stand of grass or other specified living vegetative
cover, by sodding, in areas shown on the Plans. Maintain the cover for the term of the Contract.
623-2.01 Materials.
1.Sod. Use livi ng native plants and grasses that grow in the more fertile soils near the project. Preferred plants include willow, alder, fireweed, calamagrostis, bearberry, red top, and other natural species. Establish fertility by observing the quality and quantity of the plants and grasses in their natural location. Collect sod out of sight of the roadway and within the right -of-way if possible. Obtain authority to remove sod from areas outside the right -of-way. Obtain approval of the sod in its original position befor e cutting. Cut sod in blocks of at least 6 ft2. Obtain approval to use different dimensions. Include an intact root system with natural soil at least 4 inches thick.
2.Fertilizer . Use a 28- 8-4 mixture in 300- grain pellets, meeting the requirements of Section 725.
623-3.01 CONSTRUCTIO N REQUIREMENTS. Prepare the area to be sodded by removing
oversize rocks, logs, wood, soil clods, paper, and other debris. Dispose of debris out of sight of the roadway. Smooth any rivulets eroded into the face of the slope, by ta pering the edges into the depressions. Smooth the area enough to allow planting sod.
1.Keep sod moist at all times. Water sod if necessary prior to cutting. Keep as much soil as possible in the natural state around the roots during digging, hauling and plant ing.
2.Use approved mechanized methods wherever possible to obtain and place sod.
3.Place sod on the designated slopes without excavating holes and within 6 inches of the locations specified on the Plans. Place each piece tightly against adjoining pieces. On s lopes steeper than 3:1, peg sod pieces as directed.
4.Fill and pack voids with suitable soil from the sod source. Tamp or roll sod firmly in place, to eliminate air pockets provide a smooth plane, level with the adjacent slope.
5.Fertilize the sod using 2 pell ets per sod block. Water sod within one hour of placing. Continue watering sod blocks until project completion.
623-4.01 METHOD OF M EASUREMENT. See Section 109, measured on the slope of the ground
surface.
623-5.01 BASIS OF PA YMENT. Watering will be paid f or under item 618.0003.____.
The contract price includes all cutting, hauling, placing, slope preparation, fertilizing, and cleanup. Payment will be made under: PAY ITEM Item Number Item Description Unit 623.0001.____ Sodding SY
Source: Alaska Standard Specifications for Highway Construction, 2020 Edition. Pages 365–369 of 584.