CR-– 21 Landscapes and Irrigation AZROC Exam V2 Arizona Registrar of Contractors (AZROC) Commercial Landscaping and Irrigation – 2026/2027 Edition – Verified Questions and Answers

CR-– 21 Landscapes and Irrigation AZROC Exam V2 Arizona Registrar of Contractors (AZROC) Commercial Landscaping and Irrigation – 2026/2027 Edition – Verified Questions and Answers What determines the size of the pipe used in a sprinkler system? A. How tall the grass is B. How far the run is from the water source C. How many circuit there are D. How many GPM is needed to flow through it D. How many GPM is needed to flow through it Matching Water Flow and Pressure with Pipe Size To select and specify the most suitable pipe, the irrigation system designer must know the amount of water demanded by the sprinkler heads that are downstream from each section of pipe. What best describes foliage on trees? A. the leaves, branches and the trunk B. the leaves C. the leaves and branches D. the flowers on the tree B. the leaves Which of the following species include both evergreen and deciduous varieties? A. cypress B. maple C. oak D. pine C. oak What should be provided as a cover for the drain tile before installing the pond liner where a subdrain is used? A. 4 inches of pea gravel B. a pool grate C. screen with a 1/4 inch mesh D. 8 inches of medium sized rock A. 4 inches of pea gravel The use of mulch on new plants does all except? A. Control Temperature fluctuations B. Stops insects C. Discourages weed growth D. Aid in water retention B. Stops insects If a contractor is in willful violation of Arizona Blue Stake , what is the maximum fine? A. $5000.00 B. $500.00 C. $250.00 D. $300.00 A. $5000.00 Arizona law (A.R.S. 40-360.21-32) says underground utilities must be marked before any type of excavation by anyone, including professional excavators, homeowners and anyone else whose work disrupts the subsurface of the earth. This law is enforced by the Arizona Corporation Commission (ACC) who can issue citations for civil penalties of up to $5,000 per violation. Which finish is best used when subject to regular dampness? A. Putty finish B. Sand finish C. Portland cement Plaster finish D. Keenes cement finish C. Portland cement Plaster finish What does the color green indicate? A. Communications & phones B. Electrical C. Sewer D. Potable water C. Sewer Electric Power Distribution - Safety Red Gas, Oil Distribution - High Visibility Safety Yellow Telephone, Cable, Fiber Optics - Safety Alert Orange Water Systems - Safety Precaution Blue Sanitary Sewer Systems - Safety Green Reclaimed Water - Purple When a specific depth of soil is removed on a site, what is this called? A. Filling B. Banking C. Leveling D. Cutting D. Cutting What is the benefit of an as-built plan? A. shows where the contractor made mistakes or errors B. to indicate where lines are for future additions or repairs C. purchase leverage D. selling leverage B. to indicate where lines are for future additions or repairs What thickness in millimeters of pavers is used for residences? A. .6 B. .5 C. .75 D. 63.5 D. 63.5 Brick (paving brick, pavers). Rectangular fired clay brick with typical dimensions of 4 inches x 8 inches x 2.5 inches thick. Available in a range of colors, paving bricks have no mortar holes and an average strength of approximately 5,000 PSI. What is the length of a standard concrete block including the mortar joint? A. 8 inches B. 10 inches C. 12 inches D. 16 inches D. 16 inches Sizes are usually given in their nominal dimensions.A unit measuring 7 5/8" wide, 7 5/8" high, and 15 5/8"long is known as an 8" x 8" x 16" unit. The mortar jointis intended to be 3/8" to fit the modular design basedon a 4" module. When should you seal the bottom of a piece of wood fencing? A. If water pools under them B. when within 5 feet of a sprinkler head C. If there is less than 2 inches of clearance from the ground. D. If it touches the earth D. If it touches the earth If the boards have to touch the earth, seal the board ends before you install them. How is transplant shock avoided? A. NEED HELP WITH THIS CHOICE B. Anti transpirants C. increase water D. Fertilize B. Anti transpirants Antitranspirants, also called antidesiccants, are chemicals that reduce the amount of water plants lose through transpiration. Antitranspirants are useful because excessive water loss can result in transplant shock. They normally act either to induce closing of the stomata or to cover the stomata with a water-impermeable coating. A trench has been prepared for a gray water irrigation lines, according to the International Residential Code, what shall be the minimum depth of the filter material beneath the perforated line? A. 12 inches B. 3 inches C. 8 inches D. 6 inches D. 6 inches Not less than 6 inches in depth of aggregate, ranging in size from 1/2 to 2-1/2 inches (12.7 mm to 64 mm), shall be laid into the trench below the distribution piping elevation. A CR-21 licensee may install residential misting systems under what PSI? A. 1000 psi B. 120 psi C. 90 psi D. 500 psi A. 1000 psi HARDSCAPING AND IRRIGATION SYSTEMS This classification allows the licensee to install, alter, and repair: Residential outdoor misting systems. Free standing or attached to existing appurtenance, not more than 1000 PSI. Blue Stake uses orange to mark which of the following? A. Gas B. Electric C. Fiber Optics, Cable, Phone D. Sewer C. Fiber Optics, Cable, Phone Electric Power Distribution - Safety Red Gas, Oil Distribution - High Visibility Safety Yellow Telephone, Cable, Fiber Optics - Safety Alert Orange Water Systems - Safety Precaution Blue Sanitary Sewer Systems - Safety Green Reclaimed Water - Purple What color is used to mark an area for locating utilities prior to excavations? A. Green B. White C. Blue D. Pink B. White All of the following will not decrease the water pressure in a long run of irrigation pipe except? A. A pipe going down hill B. Going from a larger pipe to a smaller pipe C. Less Sprinklers on a run D. Going from a smaller piper to a larger pipe D. Going from a smaller piper to a larger pipe How is total surge pressure calculate? A. Surge pressure caused by an opening valve plus working pressure in the pipe line B. Water hammer plus static pressure in the pipe line C. Surge pressure caused by a closing valve plus working pressure in the pipeline D. Working water pressure in the pipeline plus static pressure C. Surge pressure caused by a closing valve plus working pressure in the pipeline Pressure caused by closing a valve on pressured water When is a good time to transplant? A. Summer B. NEED HELP C. Late Spring D. Early Fall D. Early Fall What kind of screw resists rusting? A. Fine thread B. Steel C. Phillips D. Brass D. Brass A footing for a fence is 2 Ft deep, 1 Ft wide, and 40 Ft length, how many cubic yards of concrete will we need? A. 2.96 CY B. 80 CY C. 16 CY D. 8.88 CY A. 2.96 CY Reason: Use Formula LxWxD in order to find solution, in this case it is 2x1x40. Then you divide answer by 27 (amount of cubic feet in a yard) to get answer 2.96 When is it okay to use low point drains on a main line? A. When the freeze depth is no more than 3 Ft B. In Arid Regions only C. When depth of freeze is 3-6 Ft. D. When freeze depth is no more than a foot D. When freeze depth is less than one foot In sandy soil the movement of water is ____________________ A. Only Horizontal B. Only Vertical C. More Horizontal than Vertical D. More Vertical than Horizontal D. More vertical than horizontal Explanation: The larger the pores in a permeable surface, the more likely water will get trapped and travel vertically. Less permeable surfaces cause water to run more horizontally. If a contractor is in willful violation of Arizona Blue Stake, what is the maximun fine? A. $250.00 B. $5000.00 C. $300.00 D. $500.00 B. $5000.00 Brick is laid on concrete foundations, the first bed of mortar joint shall be what maximum thickness? A. 1-1/2 Inch B. 3/4 Inch C. 1 Inch D. 2 Inches B. 3/4 Inches There are four (4) RCV valves in a sprinkler system that are wired independently and draw 0.15 amps each. If the system voltage is 24 volts, what is the total wattage demand for these four valves? D. 14.4 Watts Volt x Amp = Watts ---- Answer x Amount of Valves = Total Watts Which element in fertilizer governs the growth rate and the green color of grass? A. Sulfur B. Nitrogen C. Chlorophyll D. Phosphorus B. Nitrogen After blue stake has marked facilities, how many working days are the markings good for? A. 21 days B. 7 days C. 15 days D. 10 days C. 15 Days Markings are valid for 15 days, or markings disappear, contact blue stake. Markings must be visible during project. How do you prevent winter heaving of ground cover? A. Anti-transpiriant B. NEED HELP WITH THIS CHOICE C. Mulching D. Fertilization C. Mulching Street pressure is 40 psi and 12 psi is lost to friction, what pressure is available? A. 64.68 Feet of head B. 28 Feet of head C. 121.52 Feet of head D. 42 Feet of Head A. 64.68 Feet of head "head" is used to express pressure. Water pressure can be converted to head by multiplying psi x 2.31 Head of water can be converted to pressure by multiplying "head" x 0.433 MATH: 40 Psi - 28 Psi = 28 Psi 28 psi x 2.31 = 64.68 Feet of Head What is the MINIMUM initial bed joint thickness for placing masonry unit. A. 1/4 Inch B. 1 Inch C. 3/8 Inch D. 1/2 Inch A. 1/4 Inch A masonry pattern with all VERTICAL joints aligned is called a ________ Bond A. Flemish B. Running C. Common D. Stack D. Stack Due to the strength of bond being weak, typically this bond is backed with rigid steel ties. What is the correct method of building a masonry wall? A. One course at a time B. From one corner to the next C. From the middle to the corners D. From the Corners to the Middle. D. From the corners to the middle After the corner leads have been constructed, the blocks are laid between the corners. A masons line should be stretched from corner to corner all the proper height for each course. What does the color ORANGE mean in utility marking? A. Water, irrigation, slurry lines B. Gas, oil, Petroleum C. Electrical Lines D. Communications, Phones D. Communications, Phones Electrical - Red Oil - Yellow Telephone - Orange Water - Blue Sanitation - Green Reclaimed water - Purple Which of the following valves has the greatest tendency to wear out or break over time? A. Ball Valve B. Globe Valve C. Angle Valve D. Gate Valve D. Gate Valve How should post holes be dug? A. Vertical sides B. 6 inches larger than the post C. Bottom 4 inches larger than the top D. Top 2 inches larger than bottom C. Bottom 4 inches larger than the post ________ ___________ / / /_________________ What is used to hold blocks together? A. Grout B. Rebar C. Mortar D. Glue C. Mortar Mortar is a mixture of sand, lime, water, and Portland cement. Stays are used on wire mesh and barbed wire fencing to __________. A. Keep the posts upright B. Keep animals out C. Keep wire fencing tight D. Keep wire strands evenly spaced. D. Keep wire strands evenly spaced Wire fences have horizontal - fillers and vertical - stays How do you reduce pressure in an irrigation system? A. Pressure Regulator B. Partially close valve C. Increase pipe size D. Reduce pipe size A. Pressure Regulator Reduces water friction therefore reducing pressure What is a water shield? A. A hydraulic/water auger B. A waterproofing treatment applied to the post prior to setting C. Concrete poured 2" above grade and sloped away from the post on all directions D. Aluminum flashing attached to the post base C. Concrete poured 2" above grade and sloped away from the post on all directions "Weep Holes" may be utilized in which of the following methods of change in site grading? A. Earth Embarkment B. Retaining walls C. Timber Cribbing D. Stone Rip Rap B. Retaining walls Small holes in retaining walls to allow water excess to be washed out from behind retaining wall What is the purpose of Humus? A. To Replace Sulfur B. To aid in compaction C. To increase water retention D. To decrease water retention C. To increase water retention Which of the following is an approved method for connecting corrugated metal pipe? A. Welded B. Bell C. Band and Clamp D. Slip Joint C. Band and Clamp What characteristic of a tree most affects erosion? A. The height it begins to branch B. The shape against the sky C. The stickiness of the leaves D. The type of root system D. The type of root system Erosion means dirt, none of the other options include dirt According to the OSHA standards for the construction industry, compressed air shall not be used for cleaning purposes except when __________. A. Less than 50 psi B. Less than 30 psi and with chip guarding C. Less than 30 psi D. Less than 50 psi and with a chip guarding B. Less than 30 psi and with chip guarding Which principle of landscaping design deals with the size of landscaping items? A. Proportion B. Simplicity C. Focalization D. Rhyme and Rhythm A. Proportion +++Scale+++ How deep should a post be placed in the ground if NO concrete is used? A. Below frost line B. 30 Inches C. 42 Inches D. 12 Inches B. 30 Inches What is a GFI used for? (GFI - Ground fault interrupter outlet) A. Provide back up power B. Reducing the power C. Split power leads D. Shut off power from a short circuit D. Shut off power from a short circuit What is the minimum required back flow protection? A. Double check Valve assembly B. Pressure Vacuum Breaker C. Atmospheric Vacuum breaker D. Reduced pressure principle back flow preventer C. Atmospheric Vacuum breaker An Atmospheric Vacuum Breaker (AVB) is a backflow prevention device that incorporates an atmospheric vent with a check valve to prevent backsiphonage (reversal of the normal flow of water caused by a negative pressure in the supply piping) of non-potable liquids into the potable water supply. How should PVC piping be laid in a trench? A. In the shortest length possible B. In a straight as line as possible C. By snaking from side to side D. Supported firmly at points not more than 10 ft apart C. By snaking from side to side Snaking allows PVC piping to expand and contract due to temperature changes A footing for a fence is 2 feet deep, 1 foot wide and 40 feet in length, how many cubic yards of concrete will be needed? Length x Width x Height Total divided by 27 ( Cubic feet per cubic yard) A. 8.88 Cy B. 80 Cy C. 16 Cy D. 2.96 Cy D. 2.96 Cy Length x Width x Height Total divided by 27 ( Cubic feet per cubic yard) When is it okay to use low point drains on a mainline? A. When the freeze depth is 3 to 6 feet B. When the freeze depth is no more than 3 feet C. When the freeze depth is no more than 1 foot D. In Arid Regions only C. When the freeze depth is no more than 1 foot In sandy soil the movement of water is ___________. A. More vertical than horizontal B. Only Horizontal C. Only vertical D. More horizontal than vertical A. More vertical than horizontal When transplanting a cactus, what should be done once the cactus is removed from the soil? A. Bind the roots with burlap B. Dust the roots with powder sulfur C. Wash the roots with water D. Nothing B. Dust the roots with powder sulfur What personal protective equipment is required when using an abrasive wheel? A. Face shields and protective aprons B. Safety Glasses C. Heavy Gloves D. PPE is not required for hand tools B. Safety Glasses What is the minimum sub base for a residential paver pathway A. 4 Inches B. 6 Inches C. 3 Inches D. 5 inches C. 3 inches According to code, the minimum thickness for a concrete slab that is supported directly on the ground shall be _____ Inches. A. 4.5 inches B. 3 Inches C. 3.5 Inches D. 4 Inches C. 3.5 Inches Refer to the illustration. Which schematic shows the correct way to wire a sprinkler controller and three independently controlled remote control valves (RCV's) A. Schematic C B. Schematic D C. Schematic B D. Schematic A In test all will be different All of the following factors effect sprinkler system precipitation rate except: A. Water source B. Wind C. Sprinkler spacing D. Water pressure at the sprinkler A. Water source Refer to the illustration, what does this represent? A. Triangular spacing B. Drip System C. Drainage System D. Lighting System B. Drip System How many sprinklers with a 9 foot radius are indicated on the plan? A. 12 B. 1 C. 8 D. 4 B. 1 You need to trench 50 feet along a utility line. A trenching machine excavates 5 feet in 30 seconds to 1 minute. The trench should be dug? A. Slowly and carefully over approximately 5 minutes B. In less than 2 Minutes C. Last D. By Hand D. By Hand Too close to utility line to risk machine dig What is the mil rating of a vapor barrier that must be installed under a concrete slab? A. 4 B. 6 C. 1 D. 2 B. 6 A 6-Mil polyethylene vapor retarder with jointed tapped not less than 6 inches shall be placed between the base course or subgrade to retard vapor transmission through the floor slab How is a post hole dug? A. About one third larger on the bottom than the top B. Same size on the top and bottom C. About one third larger on the top than the bottom D. 3 times wider on the top than the bottom A. About one third larger on the bottom than the top In landscaping, which directions must the water drain? A. Away from trees B. Away from buildings C. Toward trees D. Toward buildings B. Away from buildings How long do you need to wait before setting the second course on the base? A. 2 Hours B. No wait time C. 1 day D. 1 hour D. 1 hour What is the actual size of a 2 x 4 surfaced dry piece of framing lumber? A. 1 3/4 by 3 3/4 B. 1 1/4 by 3 1/4 C. 2 by 4 D. 1 1/2 by 3 1/2 D. 1 1/2 by 3 1/2 When placing a culvert for drainage, what is the MINIMUM allowed slope? A. 2 percent B. .5 Percent C. 1.5 Percent D. 1 percent B. .5 Percent What is the maximum height above grade of a wooden deck that a CR-21 Licensee may build? A. 48 Inches B. 18 inches C. 29 Inches D. 36 inches C. 29 Inches What do you use to give a block wall a finished look? A. Cap Block B. Bond Block C. Pilasters Channel Block A. Cap block On a long run over 100 feet from a low voltage transformer, what size wire would be best suitable? A. 10-2 B. 16-2 C. 18-2 D. 12-2 D. 12-2 What is the final step by the plasterer when finishing a sand finish coat? A. Brush Water over surface with plasterer brush B. Steel Trowel the finish C. Float with a rubber faced float D. Sand with coarse grit paper C. Float with a rubber faced float A chemical NOT used as a perservative for treating wood fencing is: A. Pentachlorophenol B. Creosote C. Calcium Chloride D. Ammonal Copper Zinc Arsenate C. Calcium Chloride How can you fix overworked concrete? A. Tear out and repour B. Cover to slow curing rate C. Add more aggregate and vibrate D. Patching or overlaying D. Patching or overlaying What is the defining characteristic of a perimeter wall? A. It is a wall built surrounding equipment B. Is is a wall surrounding a courtyard C. Is is a wall built upon the outline of an area D. It is a wall built to keep things out C. Is is a wall built upon the outline of an area Primarily referred to as a property line wall Which of the following is a xeriscaping fundamental? A. Water conservation B. How the plants react to acidic soil C. Low Maintenance D. How plants look against the sky A. Water conservation Xeriscaping - Low water maintenance areas What is the MAXIMUM distance between expansion joints of a 6 foot masonry wall 50 feet long? A. 8 feet B. 16 feet C. 24 Feet D. 12 Feet B. 16 feet Expansion joints prevent a wall from cracking or breaking apart. If you have multiple valves on a station an increase in wire size may be required because of _______. A. An increase in Pressure B. A decrease in pressure C. An increase in volts D. An increase in amps D. An increase in amps More valves require more amps How much base is needed for a paver driveway? A. 8 to 12 inches B. 1 to 3 inches C. 4 to 6 inches D. 12 to 24 inches A. 8 to 12 inches When using portland cement on an exterior, what is the proper ratio of cement to sand? A. 3:1 B. 4:1 C. 5:1 D. 7:1 A. 3:1 3 parts sand to 1 part cement When measuring the amount of fabric to use for a pond, you should take the maximum length times? A. The depth plus three feet B. Twice the depth plus three feet C. Three times the depth D. Twice the depth B. Twice the depth plus three feet How far apart should bands be placed? A. 12 inches B. 10 inches C. 8 inches D. 16 inches 12 Inches to fasten tension bands The curing of concrete continues as long as its relative humidity remains above __________. A. 90% B. 70% C. 80% D. 60% A. 80% Which of the following spray nozzles would be used on non sodded banks or berms to minimize run off? A. Stream B. Low angles C. Strip D. Short radius A. Stream When installing an electrical (irrigation) pump, a circuit breaker (disconnect) must be installed within __________ feet of the pump A. 15 B. 50 C. 12 D. 10 B. 50 Feet The method of planting grass that involves placing individual sections of rhizomes or stolon in rows of trenches in the ground and then covering with soil and packing is called: A. Sodding B. Sprigging C. Plugging D. Hydro Seeding B. Sprigging What is the minimum clearance for a combustible mantel OVER a fireplace opening? A. 4 Inches B. 6 Inches C. 18 Inches D. 12 Inches D. 12 Inches How do you prevent erosion from a graded slope? A. Put water baffles at the bottom of the slop B. Water the slope C. Cross grade the slope D. Stabilization D. Stabilization The best season for planting native desert plant species? A. Summer B. Fall C. Mid Winter D. Late Spring B. Fall What side of a cactus develops a thicker tougher skin due to sun exposure A. East Side B. South Side C. West side D. North Side B. South Side On a power tool, when is it allowable to have a lock-on switch? A. If it has momentary switch B. If it has a constant pressure switch C. When the blade shank is 1/4 inch wide or less D. If it can be turned off with a single finger motion. D. if it can be turned off with a single motion According to OSHA, what type of evacuation plan is needed for an employer with 10 or fewer employees? A. Written B. CAD Drawing C. Published D. Oral D. Oral Where should boosters be installed? A. At a water source B. At the valve box C. Along pressurized mainlines D. Along lateral lines C. Along pressurized mainlines Horizontal centrifugal pumps are used to boost pressure and can be installed along pressurized lines to boost pressure. What is a channel projector for a waterfall for? A. Make sure basins have equal water B. Ensures water goes to lower basin C. Takes place of a weir D. Pressurizes the water to force it into the upper basin B. Ensures water goes into a lower basin How much clearance is the wood framing required to have where a masonry chimney passes through a roof opening? A. 1 B. 1/2" C. 1.5" D. 2" D. 2" Any portion of a masonry chimney located in the interior of the building or within the exterior wall shall have a minimum air space clearance to combustibles of 2" Pump Capacity is rated according to flow rate and dynamic: A. suction head B. suction lift C. total head D. discharge head C. Dynamic Total Head Adding dynamic suction lift and dynamic discharge head provides dynamic total head. Capacity of pumps is rated by their flow and dynamic total head. What insect is bad for turf? A. Lady bugs B. Fire Ants C. Miratoad D. Scale D. Scale To prevent salt buildup around a plant welling patterns are __________. A. Overlapped B. Subsurface C. Floaded D. Misted A. Overlapped According to code, what is the maximum area of a brick veneer wall that an anchor tie shall support? A. 4 Square Feet B. 1 Square foot C. 2 Square feet D. 3 Square feet 2 Square feet On concrete delivery time, how long do you have before concrete should be poured? A. 1.5 hours B. 2 hours C. 1 hour D. 2.5 hours A. 1.5 Hours If a chain link fence is 60 feet long, how far apart are the posts placed? A. 9 feet B. 10 feet C. 8 feet D. 6 feet B. 10 Feet Placement of emitters should avoid direct contact with ___________. A. The bare roots of a plant B. The trunk of the plant only C. The trunk or the stem of the plant D. The stem of the plant only C. The trunk or the stem of the plant What type of backflow device is used when effluent is used in the irrigation system. A. Reduced pressure principle backflow preventer B. Double check valve assembly C. Atmospheric vacuum breaker D. Pressure vacuum breaker A. Reduced pressure principle backflow preventer If you are going to leave the clippings of the cut grass, what length should you cut at? A. 1/3 Blade length B. 1/2 blade length C. 1/2 inch D. 1 inch A. 1/3 inch blade If a lawn is needed immediately, which method should be used? A. Hydro Seeding B. Sprigging C. Sodding D. Plugging C. Sodding Already grown grass used as patches for a landscape What determines the pattern and quantity of a water spray head? A. Water Pressure B. Water velocity C. Sprinkler position D. Spray nozzle D. Spray Nozzle What do you do before grading? A. Check natural drainage B. Install control module C. Install irrigation lines D. Compact the soil A. Check natural Drainage What should be done with scrap wood with nails in it? A. Collect in a labeled container B. Remove the nails before stacking or piling it C. Move it out of the work area D. Grind the nails flush B. Remove the nails before stacking or piling it It is only necessary to wet _________ of the root zone of most plants to provide the benefits of irrigation. A. 75 % B. 25% C. 50% D. 85% C. 50% What is the advantage of using veneer plaster over conventional plaster? A. It is better able to receive wall covering B. It is faster C. It is more water resistant D. Is is more durable B. It is faster Where would you plant flowers for a focal point? A. Don't use flowers for focal point B. in front of the trees and shrubs C. The front of the building D. Entry way D. At entry way Many shrubs are planted for their flowering quantities and must be pruned at the proper time to realize their maximum potential for flowering. Spring flowering shrubs should be pruned in : A. Early Spring B. Late Summer C. Fall D. Late spring A. Early Spring Grass is scheduled for fertilization, what should not be used? A. Limestone B. Commercial Fertilizer 10-10-10 C. Nitrogen Phosphoric Acid and Potash D. Commercial fertilizer 10-6-6 A. Limestone What is the most cost effective use of a Paver Cut? A. Haul Away and sell B. Haul away and dump C. Use to fill onsite D. Use to fill on another site C. Use to fill onsite Which fertilizer analysis is best for use in the desert? A. 5-10-10 B. 10-40-10 C. 4-12-4 D. 10-20-0 C. 4-12-4 What procedure should be used to install a flagstone patio? A. Start in the middle and work toward edges B. Start at the edges and work toward the middle C. Start at one end and work towards other end D. Start at the high point and work toward the low point B. Start at the edges and work toward the middle You have 2 BCY of sand, after compaction you will have? A. 1.96 CCY B.2.24 CCY C. 3 CCY D. 1.75 CCY A. 1.96 CCY Sand Expansion and Compaction unit is .98 Multiply .98 by 2 BCY to get 1.96 CCY What causes a pop up riser to rise? A. Suction B. Timer C. Water Pressure D. Electric current C. Water Pressure Which of the following causes of water hammer is NOT of concern in a typical irrigation system that uses a well as a water source? A. Trapped air in long pipe runs B. Reverse flow when the pump stop s C. Uncontrolled flow velocity in empty pipes D. Valve closure A. Trapped air in long pipe runs How many cubic feet of concrete are need for a 4 inch pad that measures 8x20 foot? A. 640 B. 53.28 C. 160 D. 1.97 B. 53.28 When a specific depth of soil is removed on a site, what is this called? A. Leveling B. Banking C. Cutting D. Filling C. Cutting What is the maximum allowable crack in an expansion joint? A. 1/4 inch B. 1/16 inch C. 3/8 inch D. 1/2 inch C. 3/8 inch What should be added to the soil if it has a high PH level? A. Limestone B. Sodium Nitrate C. Ammonia D. Sulfur D. Sulfur Given: The composition of chemical fertlizers is written on the package by three numbers representing percentages of the elements in the total package. What chemical are in a fertlizer 23-6-3? A. 23% nitrogen, 6% Phosphoric acid, 4% potash B. 23% Phosphoric acid, 6% Nitrogen 4% Potash C. 23% nitrogen 6% potash 4% phosphoric acid D. 23% nitrogren 6%lime 4% potash A. 23% nitrogen, 6% Phosphoric acid, 4% potash ALWAYS SHOWS AS NITROGEN - PHOSPHORIC ACID-POTASH According to code, footings shall be stepped when? A. Stepped footing are not permitted B. If the ground surface slopes more than one unit vertical to ten units horizontal or where necessary to change the top footing surface elevation C. Only where necessary to change the top footing surface elevation D. Only when the ground surface slopes more than one unit vertical to ten units horizontal B. If the ground surface slopes more than one unit vertical to ten units horizontal or where necessary to change the top footing surface elevation How many volts does an automated sprinkler system use? A. 240 Volts B. 277 Volts C. 120 Volts D. 24 Volts D. 24 Volts What is the purpose of reinforcement steel in a concrete slab? A. Tensile B. Compression C. Bending D. Shear A. Tensile The sprinkler water passing through an electric solenoid diaphragm valve contains debris and the inlet port is blocked, water cannot flow into the: A. Upper Chamber and the valve would remain closed. B. Lower chamber and the valve would remain open C. Valve and the operation would not be affected D. Upper Chamber and the valve would remain open? Upper Chamber and the valve would remain open? When are the fence rails installed? A. After the posts have set B. Before the posts C. After the fence is finished D. Before the posts have set A. After the posts have set At what depth should the wire be buried for an irrigation sprinkler system with 30 volts? A. 6 inches B. 18 inches C. 24 Inches D. 12 inches A. 6 Inches Which plant would be an example of a spreading plant that may be planted at the corners of buildings? A. Browns Yew B. Hemlock C. Rose of Sharon D. Hetz Junipers D. Hetz Junipers Which type of joint reinforcement should be used in a veneer plaster system? A. Glass fiber tape B. Metal C. None D. Paper tape A. Glass Fiber Tape What will cause a drop in power in a low voltage line? A. Temperature of the ground B. Number of wires bundled together C. Size of the conduit D. The length of the run D. The length of the run The longer the wire travels, the less energy it gives out You should space lawn sprinkler heads so the coverage does not exceed ________ of another sprinklers head coverage A. 100% B. 50% C. 10% D. 25% B. 50% Head to Head coverage What is the minimum distance between the top of the sewer line and the bottom of a water line where they cross? A. 6 inches B. 15 inches C. 12 inches D. 18 inches C. Minimum 12 inches What is the least costly lawn? A. Sodding B. Plugging C. Sprigging D. Seeding D. Seeding Less costly, more timely What determines the quantity of water flowing in a pipe? A. Water Hammer B. Pipe Size C. Water Source D. Surge Pressure B. Pipe Size Bigger pipe, more water flow Bare roots should be planted in: A. A concave shaped hole B. A mounded bottom hole C. an extremely deep hole D. A flat bottom hole B. A mounded bottom hole After the scratch coat of Portland Cement mortar is applied and scored, it should be set and cured for at least: A. Three Days B. One Day C. Two Days D. Five Days C. Two Days No Less than two days, preferably 7 days When plastering, how far from the face can scaffolding be? A. 14 inches B. 18 inches C. 10 inches D. 12 inches B. 18 inches Maximum distance of scaffolding to wall should be 18 inches What is the pressure rating of a pipe that is stamped 2inch SCH 40 PVC 1120 280 PSI at 23 degrees C ASTM D-1785 USPI NSF-PW? A. 280 B. 1120 C. 23 D. 160 A. 280 What technique is used for planting trees but is not normally used when planting shrubs? A. Watering B. Mulching C. Staking D. Soil Conditioning C. Staking When setting a fence post in concrete, how should the top surface be finished? A. Light broom finish B. Sloped towards the post C. Sloped away from the post D. Levelled Off C. Sloped away from the post How soon after application of a herbicide should the tank be cleaned out? A. Immediately B. Only when changing to a different herbicide C. Weekly D. Prior to the next use A. Immediately What is the white powder or crust that is found on masonry walls and is caused by salt drawn to the surface by moisture? A. Bleeding B. Hydration C. Efflorescence D. Seepage C. Efflorescence White powder like substance or salt like deposit on masonry walls caused by water soluble salts What does OSHA consider to be the minimum safety equipment? A. Goggles, Face Mask, Gloves, and First aid kit B. Helmet and steel toe boots C. Goggles. mask, and gloves D. Respirator and glasses C. Goggles. mask, and gloves Where should a transformer with a photocell be installed? A. Out of plain view B. Behind a shrub C. Where there is ample sun D. On the east wall of a structure C. Where there is ample sun What is a " Cross Connection" A. A loop between two lines in a single zone B. A point of connection between polluted and potable water C. An intersection point of a four way system D. A threaded connection where the pieces are improperly aligned B. A point of connection between polluted and potable water Control joints in a concrete block wall should be sealed with caulking compound after the mortar has been raked out to a depth of _____________. A. 3/4 inch B. 1/2 inch C. 1 Inch D. 1/4 inch A. 3/4 inch What is red used for in utility markings? A. Communication, TV B. Sewer C. Gas D. Electric D. Electric What is used for drainage in a post hole A. 6 inches of gravel B. 4 inches of sand C. dig a drainage trench D. cement in the bottom A. 6 inches of gravel What minimum size perforated pipe shall be used in a gray water irrigation system? A. 1 1/2 inch B. 2 2/2 Inches C. 3 inches D. 2 Inches C. 3 inches What is the preferred slope for a brick paver walkway in a well drained area? A. 3/8 inch to 1/2 inch B. 1/8 inch to 1/4 inch C. 1/2 inch to 3/4 inch D. 1/4 inch to 3/8 inch B. 1/8 inch to 1/4 inch What is the maximum size of a bed joint in a masonry wall directly on the foundation. A. 1/2 inch B. 1/4 inch C. 3/4 inch D. 3/8 inch C. 3/4 inch Why is "holding current" important in irrigation A. System wont come on B. System wont stay open C. The timer will have to be reset D. System wont stay closed B. System wont stay open What type of power tool requires upper and lower guards A. Grinder B. Crosscut Saw C. Portable circular saw D. Disc Sander C. Portable circular saw A fence with round rails and posts where the rails are reduced to dowels are called? A. Split Rail B. Paddle Post C. Peeled post and rail D. Picket C. Peeled post and rail What is used when the main and lateral lines are placed at the same depth? A. An Angle valve B. An overly high pressure C. A glove valve D. A controller C. A glove valve According to OSHA, what type of guard (or safety) is required for a power saw? A. 2 Handed trip switch B. Electronic safety device C. Point of operation D. Barrier C. Point of operation Specific area meant for just cutting material with saw Planting a bright colored "focal" flower should be planted where?? A. Out curve B. Incurve C. Tucked between the shrubs bordering lawn D. Spread across from of building B. Incurve Where is the natural point for a focal point? A. Point of balance B. On the incurve C. Middle of the yard D. Along the bed line B. On the incurve What is the best time to water turf grasses to prevent turf disease? A. Between early morning and late afternoon B. Any time before midnight C. Early Evening Hours D. Any time during the day A. Between early morning and late afternoon What formula determines the ratio of slope? A. Run / Rise B. Rise / Run C. Run / Rise D. Rise / run A. Run / Rise What is the proper consistency of a concrete post hole mix? A. Wet enough to hold together, but not pour B. Just wet enough to poor C. Barely damp D. Soupy (Very watery) B. Just wet enough to poor How long before digging should you notify the local marking company? A. 1 day B. 1 week C. 2 days D. 10 days C. 2 days In clay soil the movement of water is ________ A. More horizontal than vertical B. More vertical than horizontal C. Only Horizontal D. Only Vertical A. More horizontal than vertical What is the purpose of a fitting? A. To link different sizes and types of pipe B. To attach a sprinkler C. To restrict the flow of water D. To decrease the water pressure A. To link different sizes and types of pipe How wide should the footer be for a CMU wall? A. Twice the width of the block B. Equal to the depth of frostline C. Equal to the width of the block D. Three times the width of the block A. Twice the width of the block How soon should you backfill a trench? A. After installing the heads B. After flushing the pipe C. As you are doing the piping D. After completing the piping B. After flushing the pipe A pump connected to a hydro pneumatic storage tank that cycles on and off is a result of: A. Not enough air in tank B. Too much air in the tank C. A high pressure limit that is too high D. A low pressure limit that is too low A. Not enough air in tank What soil amendment increases the moisture retention capabilities of soil and provides organic material ultimately enriching the soil? A. Sand B. Bone meal C. Gypsym D. Peat Moss D. Peat Moss What causes water hammer? A. Water moving at velocities of over 5 feet per second B. Water moving at velocities of 5 feet per second or less C. Water coming directly from the main to a valve D. Water coming through the valves A. Water moving at velocities of over 5 feet per second How do you choose a weir? A. Without calculations, it is better to go with a smaller weir B. By the cost C. By the material used D. Without calculations, it is better to go with a bigger weir D. Without calculations, it is better to go with a bigger weir A weir is an opening in the edge of the basin with dimensions that allow only a calculated amount of water to pass (Figure 34-12]. The depth and width of this opening should be taken from plans or calculated by a design professional, since the size of the opening will control the amount of water that supplies the falls. In the absence of precise weir calculations, construction of an oversized weir is recommended since the flow through the weir can be restricted but not easily increased. The weir needs to be placed lower than the perimeter level of the pool to allow water to exit the pool. What is the minimum PSI of concrete steps exposed to weather? A. 3000 B. 1500 C. 3500 D. 2500 D. 2500 The international color code used by utility locators to mark an underground gas line is: A. Blue B. Orange C. Yellow D. Red C. Yellow Electric Power Distribution - Safety Red Gas, Oil Distribution - High Visibility Safety Yellow Telephone, Cable, Fiber Optics - Safety Alert Orange Water Systems - Safety Precaution Blue Sanitary Sewer Systems - Safety Green Reclaimed Water - Purple What has to be done to caliche before plants can be installed? A. Removed completely B. Desalted completely C. Amended Completely D. Aerated Completely A. Removed completely The only way to improve the drainage of caliche soil is to break through it and remove the impermeable layer. The excavated soil can be replaced with a conditioned mix that will support healthy plant growth. You have 3 BCY of clay, after excavation you will have? A. 5 LCY B. 3.5 LCY C. 4.2 LCY D. 3.75 LCY D. 3.75 LCY 3 X 1.25=3.75 Which of the following is a cohesive soil? A. Rock B. Silt C. Sand D. Clay D. Clay Cohesive soil means clay (fine grained soil), or soil with a high clay content, which has cohesive strength How do you attach wood bracing on a gate? A. Diagonally with the bottom at the hinge side B. Horizontally C. In a crisscross pattern D. Diagonally with the top at the hinge side A. Diagonally with the bottom at the hinge side Be careful how you brace a gate. The diagonal brace on a wood gate can be one of two types. You can use a 2 x 4, or a metal rod or wire. There's a difference in the way these work, and you install them differently Install a wood brace with its lower end at the hinge post. The top end goes at the latch side of the gate. The weight of the outer edge of the gate rests on the brace, which in turn pushes against the hinge and the hinge post. Cut and position the diagonal brace so the miter cuts contact the vertical frame board at the hinge side, and the gate's top rail at the latch side. What kind of nail resists rusting and holds well? A. electro galvanized B. hot dipped zinc galvanized C. blued D. bright nails B. hot dipped zinc galvanized There is a nail that meets all the requirements of holding power, rust prevention, and resistance to damage during nailing. Hot dipped zinc galvanized nails are my first choice for nailing fences together. Unfortunately, they're hard to find -- and getting harder. Too many amateurs settle for EG or cement coated nails and some professional fence builders may not care. If you do, use hot dipped galvanized nails. A 3:1 grade has an 18 foot run, what is the height? A. 6 FT B. 3 FT C. 54 FT D. 15 A. 6 FT 18 ÷ 3 = 6 Which of the following characteristics makes a shrub an effective wind break? A. How the plant looks against the sky B. How they are cut C. The shine of the leaves D. Broad leaves and thick foliage D. Broad leaves and thick foliage What is done after portions of backfill are placed in the trenches? A. Joints are pressure tested B. Wire is placed across portions of the backfill C. Grading D. Tamping D. Tamping Which of the following would be best for aerating grass? A. Clay and mulch B. Clay C. Sand and organic material D. Hard packed soil C. Sand and organic material The use of mulch on new plants does all except? A. Control Temperature fluctuations B. Stops insects C. Aid in water retention D. Discourages weed growth B. Stops insects A job takes 2 men 40 hours each to complete. The employer has a 5 man crew, assuming they work an 8 hour day how long will it take the 5 man crew to complete the same job? A. 1 day B. 3 days C. 4 days D. 2 days D. 2 days 2 men x 40 hours each = 80 man-hours total. 80 man-hours ÷ 5 men = 16 hours or 2 days What type of backflow device is used when attaching the irrigation system to a chemical tank (pre-emergent, etc.)? A. Pressure Vacuum Breaker B. Reduced Pressure Principle Backflow Preventer (RPP) C. Atmospheric Vacuum Breaker D. Double Check Valve Assembly B. Reduced Pressure Principle Backflow Preventer (RPP) Reduced Pressure Principle Backflow Preventer (RPP) This is the most sophisticated and expensive backflow device, and it is used where irrigation water could be very hazardous to human life. An example of such a hazardous situation is when you are irrigating with effluent (treated sewage) water or where toxic chemicals are injected into the irrigation system. The RPP can stop backflow either in a back-siphoning or a backpressure situation. Which of the following would be outside the scope of a CR-21 license? A. retaining wall B. decorative fence C. fence less than 6 feet D. perimeter fence or wall D. perimeter fence or wall This classification does not allow the licensee to install, contract for, or subcontract new electrical service panels, gas or plumbing lines, blasting, outdoor kitchens, gazebos, room additions, swimming pools, pool deck coatings, barbecues, concrete driveways, load bearing walls, or perimeter fencing. In the construction of a pond, what is the function of a weir? A. direct the flow of water from the lower to the upper pool B. direct the flow of water C. make the water fall away from the face of the wall D. control flow of water from upper to lower pools D. control flow of water from upper to lower pools The failure of a contractor to notify Blue Stake prior to excavation may liable him responsible for damages and subject to how much of a fine? A. $10,000.00 B. $5,000.00 C. $2,500.00 D. $1,000.00 B. $5,000.00 State law and Occupational Safety and Health Act (OSHA) require everyone to get underground facilities identified and marked BEFORE YOU DIG in public streets, alleys, easements, and all other right-of-ways. This includes private individuals, as well as utilities, contractors, excavators, etc. Persons not in compliance with the law and regulations may be held responsible for damages and possibly subject to a $5000.00 penalty per violation. Which of the following species include both evergreen and deciduous varieties? A. maple B. pine C. cypress D. oak D. oak On low voltage electrical plans, what should exist? A. All the above B. Legend of parts, make and model C. performance specifications D. Details of circuit A. All the above How does a contractor know to fill a trench to a certain grade? A. by available backfill B. the specifications C. by guessing D. the type of soil B. the specifications Caliche soil is recognized by its': A. abundance of hummus. B. high alkaline content due to excess lime. C. ability to drain well. D. tiny granules that promote deep water penetration. B. high alkaline content due to excess lime. When planting a tree, what is the best method to help insure its survival? A. Apply fertilizer generously directly to the roots B. Prune the root ball C. backfill with a high quality mulch D. Backfill with native soil D. Backfill with native soil The Soil for Installation It is best to use existing soil of the site to assure the most successful transplanting of trees and shrubs. Research has shown that plant roots adapt faster and grow deeper under those conditions. What type of backflow prevention is used between the sprinkler and circuit valve? A. pressure vacuum breaker B. reduced pressure principle preventer C. Atmospheric vacuum breaker D. double check valve C. Atmospheric vacuum breaker Atmospheric Vacuum Breaker (AVB)This device is installed between the circuit valve andthe sprinklers what should be placed over a drain tile prior to installing a pond liner? A. 2 inches of sand B. metal grate C. 4 inches of gravel D. clean soil C. 4 inches of gravel Excavate a 6 inch deep by 6 inch wide trench along the centerof the entire length of the bottom of the pool basin.In this trench, install a 4 inch diameter socked, perforateddrain tile. Continue the trench and tile to an outletpoint. Cover the tile and entire bottom of the excavationwith 4 inches of pea gravel before installing theliner or constructing the pool. A CR-21 licensee may build a decorative wall up to what height? A. 6 feet B.3 feet C. 4 feet D. 8 feet A. 6 feet HARDSCAPING AND IRRIGATION SYSTEMSThis classification allows the licensee to install,alter, and repair:4. Decorative garden walls up to six feet from finishgrade What is the name of an underground stem on a grass plant the sprouts into a new grass plant? A. rhizome B. stolon C. sprig D. plug A. rhizome While trenching and excavating, OSHA requires that employees be protected from excavated materials and other materials stored near the trench or excavation. These materials must be at least _____ of from the trench or excavation. A. 1 feet B. 3 feet C. 4 feet D. 2 feet D. 2 feet (2) Employees shall be protected from excavated or other materials or equipment that could pose a hazard by fallingor rolling into excavations. Protection shall be provided by placing and keeping such materials or equipment at least 2 feet (.61 m) from the edge of excavations, or by the use of retaining devices that are sufficient to prevent materials or equipment from falling or rolling into excavations. Trenches that are overexcavated and require backfilling below the level of the pipe shall be backfilled in layers not exceeding: A. 12 inches B. 18 inches C. 6 inches D. 3 inches. C. 6 inches Over excavation. Where trenches are excavated below the installation level of the pipe such that the bottom of the trench does not form the bed for the pipe, the trench shall be backfilled to the installation level of the bottom of the pipe with sand or fine gravel placed in layers of 6 inches (152 mm) maximum depth and such backfill shall be compacted after each placement. Who is responsible for maintaining safety (PPE) equipment if employees bring their own? A. Employer B. OSHA C. Employee D. Manufacture A. Employer Employee-owned equipment. Where employees provide their own protective equipment, the employer shall be responsible to assure its adequacy, including proper maintenance, and sanitation of such equipment. How should the trowel be held against the wall when plastering with Portland cement used for exterior application? A. Slight angle B. 45 degree angle C. ? D. Flat A. Slight angle Wall ties should be placed how far from the exposed edge of a masonry unit? A. 5/8 inch B. 3/8 inch C. 1/4 inch D. 1/2 inch A. 5/8 inch The installation of wall ties shall be as follows:1. The ends of wall ties shall be embedded in mortar joints. Wall ties shallhave not less than 5/8-inch (15.9 mm) mortar coverage from the exposedface. How many linear feet of edging will you need to go around a circle with an 8 foot diameter? A. 24 feet B. 16 feet C. 50.24 feet D. 25.12 feet D. 25.12 feet pi x the diameter 3.14 x 8 = 25.12 Which spray head covers a smaller area? A. Rotary head B. Gear drive head C. Fixed spray head D. Impact drive head C. Fixed spray head When should drainage tile be installed? A. Before grading is complete and after the soil has been conditioned B. After grade has been set and before soil has been conditioned C. While grading is being done D. While surface soil is being conditioned B. After grade has been set and before soil has been conditioned If drainage tile is needed, it should be installed after the lawn's grade has been established, but before the surface soil has been conditioned. What is the benefit of an as-built plan? A. to indicate where lines are for future additions or repairs B. shows where the contractor made mistakes or errors C. purchase leverage D. selling leverage A. to indicate where lines are for future additions or repairs An irrigation system is not often built according to the original layout plan. When a revision occurs, the contractor should draw a revised layout plan that records all changes. This revised layout plan is an as-built drawing and is an invaluable tool for future maintenance and development. A transformer in an irrigation controller reduces 120 volts to _____ . A. 24 Volts AC B. 12 Volts AC C. 24 Volts DC D. 12 Volts DC A. 24 Volts AC A transformer in the controller reduces the 120 volts to approximately 24 volts, a figure adopted by the irrigation industry for valves because this voltage level is not harmful to people. Wire can be buried directly in the ground instead of being placed in conduits or protective pipes. This low voltage electricity is what turns the valve on and off. How do you connect PE to PVC? A. Barbed male elbow B. Threaded elbow C. Compression adapter D. Barbed male adapter C. Compression adapter You should note as well that PVC pipe and PE drip tubing can be connected together with compression adapters. This allows drip systems constructed with PE tubing to be connected to sprinkler systems constructed with PVC pipe. Which of the following characteristics makes a shrub an effective wind break? A. Broad leaves and thick foliage B. The shine of the leaves C. How the plant looks against the sky D. How they are cut A. Broad leaves and thick foliage What is the mil rating of a vapor barrier that must be installed under concrete slab? A. 1 B. 4 C. 6 D. 2 C. 6 IBC 1910.1 General. The thickness of concrete floor slabs supported directly on the ground shall not be less than 3-1/2 inches. A 6-mil polyethylene vapor retarder with joints lapped not less than 6 inches shall be placed between the base course or subgrade to retard vapor transmission through the floor slab. What is the purpose of humus? A. To replace sulfur B. To aid in compaction C. To decrease water retention D. To increase water retention D. To increase water retention HUMUS - the organic component of soil, formed by the decomposition of leaves and other plant material by soil microorganisms. What is the minimum sub base for a residential paver pathway? A. 5 inches B. 3 inches C. 4 inches D. 6 inches B. 3 inches What minimum size perforated pipe shall be used in a gray water irrigation system? A. 2-1/2 inches B. 1-1/2 inches C. 3 inches D. 2 inches C. 3 inches 1403.2 Distribution piping.Distribution piping shall be not less than 3 inches (76 mm) in diameter. Materials shall complywith Table 1403.2. The top of the distribution pipe shall be not less than 8 inches (203 mm)below the original surface. The slope of the distribution pipes shall be not less than 2 inches (51mm) and not greater than 4 inches (102 mm) per 100 feet (30 480 mm). When fertilizing the southwestern garden, among chemical fertilizers, the _____ analysis is used most often. A. 20-10-10 B. 5-10-10 C. 4-10-10 D. 4-12-4 D. 4-12-4 What does the color orange mean in utility marking? A. Electrical Lines B. Communications, phones C. Gas, oil, petroleum D. Water, irrigation, slurry lines B. Communications, phones Electric Power Distribution - Safety Red Gas, Oil Distribution - High Visibility Safety Yellow Telephone, Cable, Fiber Optics - Safety Alert Orange Water Systems - Safety Precaution Blue Sanitary Sewer Systems - Safety Green Reclaimed Water - Purple What is the most cost effective use of a cut? A. Use to fill on another site B. Haul away and sell C. Use to fill onsite D. Haul away to dump C. Use to fill onsite What is the final step by the plasterer when finishing a sand finish coat? A. Float with a rubber faced float B. Brush water over surface with plasterers brush C. Steel trowel the finish D. Sand with coarse grit paper A. Float with a rubber faced float Which of the following colors best identifies the blue stake marking for potable water? A. green B. red C. yellow D. blue D. blue Facility - Specific Color Electric - Red Gas - Yellow Telephone and Cable Television - Orange Fiber Optics Orange Water Systems - Blue Sanitary Sewer - Green Reclaimed Water - Purple How many volts are needed to run a low-voltage transformer? A. 277 volts B. 120 volts C. 24 volt D. 220 volts B. 120 volts What is the minimum distance between the top of the sewer line and the bottom of a water line where they cross? A. 15 inches B. 12 inches C. 6 inches D. 18 inches B. 12 inches 603.2 Separation of water service and building sewer. Water service pipe and the building sewer shall be separated by 5 feet (1524 mm) of undisturbed or compacted earth. Exceptions: 1. The required separation distance shall not apply where the bottom of the water service pipe within 5 feet (1524 mm) of the sewer is a minimum of 12 inches (305 mm) above the top of the highest point of the sewer and the pipe materials conform to Table 702.3. This exception also applies to conditions where a water service pipe crosses over a building sewer [see Commentary Figure 603.2(2)]. Blue Stake uses green to mark which of the following? A. Water, Irrigation B. Gas C. Sewers, Drains D. Electrical C. Sewers, Drains Electric Power Distribution - Safety Red Gas, Oil Distribution - High Visibility Safety Yellow Telephone, Cable, Fiber Optics - Safety Alert Orange Water Systems - Safety Precaution Blue Sanitary Sewer Systems - Safety Green Reclaimed Water - Purple How do you properly plant ground cover? A. In a circular pattern B. In groups of 2 C. 18 inches apart in rows D. in rows, each row staggered D. in rows, each row staggered The best season for planting native desert plant species? A. summer B. fall C. mid winter D. late spring B. fall Which is the most common voltage requirement for the operation of a typical irrigation sprinkler system remote control valve? A. 12 volt AC B. 24 volt DC C. 24 volt AC D. 12 volt DC C. 24 volt AC A transformer in the controllerreduces the 120 volts to approximately 24 volts, afigure adopted by the irrigation industry for valves becausethis voltage level is not harmful to people. Wirecan be buried directly in the ground instead of beingplaced in conduits or protective pipes. This low voltageelectricity is what turns the valve on and off How can you fix overworked concrete? A. Add more aggregate and vibrate B. Tear out and repour C. Patching or overlaying D. Cover to slow curing rate C. Patching or overlaying As with blisters, delaminations can be repaired by patching or,if wide-spread, by grinding and overlaying with a new surface.Epoxy injection may also be beneficial in some applications. Before finish-coat application of Portland cement plaster, the base coat should be _____. A. completely dry B. sanded C. moistened D. roughed up C. moistened Immediately before finish-coat application, the base coat shouldbe moistened. This moisture along with the water in the finish coatplaster provides the total curing of the finish-coat plaster. No additionalwater should be applied to the finish-coat plaster until it hashardened. Addition of water to colored finish-coat plaster beforehardening is a common cause of color variations as previously noted. If a chain link fence is 60 feet long, how far apart are the posts spaced? A. 10 feet B. 6 feet C. 8 feet D. 9 feet A. 10 feet Figure the line posts so the spacing between end posts and line posts is equal to the distance between line posts. Figure 5-9 shows the post-to-post distance and the number of posts required for various straight-line lengths of fence. To figure how many posts you'll need without the chart, do this: 1) Divide the fence length by 10. 2) If the answer doesn't come out even round up to the next highest number, then add 1 for the last end post. A concrete slab should be bull floated as soon as possible after: A. screeding B. edging C. floating D. placing A. screeding Screeding or strikeoff is the process of cutting off excessconcrete to bring the top surface of a slab to proper gradeTo eliminate high and low spots and to embed large aggregate particles, a bullfloat or darby (Fig. 11-16 top) should be used immediately after strikeoff.Design and Control of Concrete Mixtures, 15th How do you ground a metal fence? A. it is already grounded by the posts B. #12 copper wire attached to a copper ground rod. C. bond it to the water pipes D. connect it to the ground on the service panel B. #12 copper wire attached to a copper ground rod. All metal and wire fences should be pounded. You do this by driving a 6- to 8-foot copper rod into the earth. Then you clamp one end of a #I2 or larger copper or aluminum wire to the copper rod. Attach the other end to the metal fence wire. Do this every 150 feet on long fences. Which is the most important factor in choosing plants for xeriscaping? A. How well plants survive in the climate B. How much the plant will spread out C. How plants look against the sky D. When the plant blooms A. How well plants survive in the climate How high can a segmented wall be built? A. 6 feet B. 3 feet C. 4 feet D. 9 feet C. 4 feet Which of the following determines the planting of trees or shrubs along a sidewalk? A. How much it sheds B. How high it gets before branching C. When it is planted D. How sticky the leaves are B. How high it gets before branching The branching habit of plants is a combination of the number of branches, the average size of the branches, the flexibility of the branches, and I the vertical or horizontal direction of their growth. This plant characteristic becomes important when traffic control is the role of the species being selected. The sprinkler water passing through an electric solenoid diaphragm valve contains debris and the inlet port is blocked, water cannot flow into the: A. upper chamber and the valve would remain closed. B. lower chamber and the valve would remain open. C. upper chamber and the valve would remain open. D. valve and the operation would not be effected. C. upper chamber and the valve would remain open. Irrigation water must be clean of debris that could causethe inlet port to be blocked. If this should happen, watercould not flow into the upper (hydraulic) chamber andthe valve would remain open. Some valves use an inletport strainer to keep out larger debris. However,screens can be blocked by build-up of tine debris andrequire periodic maintenance. What is the minimum grade needed for proper drainage? A. 3% or greater B. less than 1% C. less than 3% D. 1% or greater A. 3% or greater The percentage of slope graded for a site is dictated by construction drawings or, in the absence of a grading plan, is determined by standards and site conditions. Standards for most sites recommend that a minimum slope of 2%-3% be maintained across turf areas to provide positive drainage. When setting a wood fence post in concrete, the bottom end of the post should be set in: A. dirt. B. a stiffer concrete mix. C. sand. D. gravel. D. gravel. What are 3 factors for a contractor to consider before deciding to install pavers? A. Engineering, plant material, and amendments to the soil B. Selection of materials, access to site, layout of project C. Privacy, the view and types of paving D. Cost, usage and maintenance B. Selection of materials, access to site, layout of project Considerations such as selection of materials,access to the site, and layout of a project shouldprecede the start of a project. All piping used for Gray Water shall be marked _____. A. Non-Potable B. Reclaimed Water C. Danger-Unsafe Water D. Bad Water C. Danger-Unsafe Water All gray water piping shall be marked or have a continuous tape marked with the words DANGER — UNSAFE WATER. Which of the following tools needs top and bottom s