Arizona ROC A-19/B-6/KA-6 Swimming Pools Including Solar Examination

A contractor is estimating the water volume for a rectangular swimming pool measuring 40 feet in length and 20 feet in width. The pool floor has a shallow end depth of 3.5 feet for 10 feet, a uniform transition slope for 20 feet, and a deep end depth of 8.5 feet for 10 feet. What is the total water capacity of this pool in gallons? (1 cubic foot = 7.48 gallons)

• A35,904 gallons
• B26,928 gallons
• C44,880 gallons
• D53,856 gallons

A circular commercial hydrotherapy spa has an inside diameter of 8 feet and a uniform water depth of 3.5 feet. What is the approximate water volume of the spa?

• A1,053 gallons
• B1,316 gallons
• C1,755 gallons
• D2,106 gallons

An engineering plan specifies a 6-inch thick pneumatically placed concrete pool shell floor. The surface area of the pool floor is 1,200 square feet. Including an estimated waste factor of 8% for overspray and rebound, how many cubic yards of shotcrete should be ordered?

• A22.2 cubic yards
• B27.0 cubic yards
• C24.0 cubic yards
• D30.5 cubic yards

On a site plan drawing with 1-foot contour intervals, the proposed pool top-of-wall elevation is established at Finish Floor Elevation (FFE) +104.0 feet. Existing grade contours across the pool excavation footprint range from +100.0 feet to +108.0 feet. What site excavation requirement is indicated?

• AThe site requires over-excavation only, with zero cut or fill.
• BThe pool must be elevated 8 feet above grade on structural steel piers.
• CThe site is completely level and requires no earthwork adjustments.
• DThe high side of the pool site requires a 4-foot cut and the low side requires retaining…

On a pool mechanical plan, a circular symbol containing the abbreviation 'HRV' located inside the main drain sump symbol represents which critical plumbing component?

• AHydrostatic Relief Valve
• BHigh-Rate Valve
• CHydraulic Return Vent
• DHeater Recovery System

A contractor is estimating #4 steel rebar for a pool shell with a surface area of 1,800 sq ft. Steel is specified in a 12-inch by 12-inch grid in both directions. #4 rebar weighs 0.668 lbs per linear foot. Allowing 15% extra for lap splices and waste, what total weight of steel rebar is required?

• A2,405 lbs
• B2,766 lbs
• C1,380 lbs
• D3,180 lbs

According to OSHA 1926 Subpart P Appendix B, what is the maximum allowable slope angle for an unshored excavation up to 20 feet deep in Type B soil?

• A34 degrees (1.5:1 slope)
• B53 degrees (0.75:1 slope)
• C45 degrees (1:1 slope)
• D90 degrees (vertical slope)

During excavation testing for a pool shell in Phoenix, soil samples exhibit an unconfined compressive strength of 0.3 tons per square foot (tsf). Under OSHA 1926 Subpart P Appendix A, how must this soil be classified?

• AType A soil
• BType B soil
• CStable Rock
• DType C soil

When an excavator accidentally over-digs the floor of a pool excavation by 12 inches below the design grade line, how must the over-excavated area be properly remediated prior to placing rebar?

• ABackfill with engineered granular soil compacted in 6-inch lifts to minimum 95% Standard…
• BFill the 12-inch void with loose uncompacted topsoil
• CLeave the over-excavation empty and increase pool water depth by 12 inches
• DFill the void with organic mulch to absorb groundwater

When excavating a pool in an area with a high groundwater table located 2 feet above the proposed pool floor grade, what is the standard engineering technique to prevent side cave-ins and allow dry shotcrete placement?

• APour concrete directly into standing water without dewatering
• BInstall a continuous perimeter wellpoint dewatering system or gravel sump pits to lower t…
• CIncrease soil slope to 90 degrees vertical
• DMix quicklime into standing water until all liquid solidifies

What is the primary functional purpose of installing a hydrostatic pressure relief valve in the lowest point of a concrete pool main drain sump?

• ATo regulate water flow speed entering the pool filtration pump
• BTo automatically drain the pool during heavy rainstorms
• CTo relieve hydrostatic groundwater pressure beneath the pool shell and prevent vessel upl…
• DTo prevent pool water from freezing during winter months

A pool excavation is planned near an existing house residence footing. To prevent undermining the house foundation, the edge of the pool excavation must not encroach within what structural plane of influence extending downward from the footing base?

• AA 15-degree plane from vertical
• BA horizontal distance of 1 foot regardless of depth
• CDirectly abutting the foundation wall
• DA 45-degree angle of repose plane extending down and out from the bottom edge of the foot…

When constructing a pool shell over low-permeability clay soil or high water table areas, structural plans typically specify a gravel sub-base layer directly beneath the shotcrete shell. What material and thickness are standard?

• A4 to 6 inches of clean, washed 3/4-inch crushed aggregate or gravel
• B2 inches of fine blow sand
• C8 inches of uncompacted organic loam
• D12 inches of clay slurry

Under Arizona law (A.R.S. § 40-360.21), how far in advance of commencing excavation must a contractor contact Arizona 811 (Blue Stake) to locate underground utilities?

• A1 hour before digging begins
• BAt least 2 working days prior to excavation
• C14 calendar days after excavation begins
• DNo notice is required on private residential property

According to OSHA 1926.651(c)(2), a stairway, ladder, ramp, or other safe means of egress must be located in trench excavations that are 4 feet or more in depth so as to require no more than how many feet of lateral travel for employees?

• A10 feet
• B15 feet
• C25 feet
• D50 feet

In regions of Arizona containing expansive soil (highly plastic clay), what engineering mitigation is required under the International Swimming Pool and Spa Code (ISPSC) prior to pool construction?

• APouring thin 2-inch unreinforced concrete without rebar
• BFlooding the excavation with water and placing interior plaster immediately
• CAdding salt to the clay to dissolve swelling minerals
• DSoil replacement with non-expansive fill, moisture conditioning, sub-drainage, or custom…

When benching an excavation in Type A soil with a depth up to 20 feet, what is the maximum allowable height for the first (bottom) bench step per OSHA 1926 Subpart P Appendix B?

• A4 feet
• B2 feet
• C6 feet
• D8 feet

According to OSHA 1926.651(j)(2), excavated spoil piles and heavy equipment must be kept at least what minimum distance from the edge of an excavation?

• A1 foot
• B2 feet
• C4 feet
• D6 feet

What standard ASTM testing method is commonly performed on site by a geotechnical inspector to verify field moisture content and dry density of compacted pool deck subgrade?

• AASTM C143 (Slump Cone Test)
• BASTM C39 (Compressive Cylinder Test)
• CASTM D6938 (Nuclear Density Gauge Method)
• DASTM E84 (Flame Spread Test)

If a swimming pool excavation must extend below the footing level of an adjacent existing masonry wall, what structural measure must be completed before excavation proceeds below the footing depth?

• APainting the wall with waterproof epoxy sealer
• BSpray watering the footing daily during excavation
• CDrilling weep holes through the existing masonry footing
• DSheet piling, shoring, or underpinning of the adjacent footing per structural engineer de…

When excavating a pool in clean, dry, uncompacted sand (Type C soil), what shoring method is required if sloping at 1.5:1 is impossible due to lot boundary constraints?

• ATrench shield (trench box), sheet piling, or continuous hydraulic shoring designed by a R…
• BUsing plywood sheeted with staples
• CTamping the sand dry with hand tampers
• DSpraying the sand face with clear acrylic coat

According to ACI 318 and ACI 506.2, what is the minimum required concrete cover over reinforcing steel rebar for concrete cast permanently against and in contact with earth (such as a pool shell floor or wall exterior face)?

• A1.5 inches
• B3 inches
• C2 inches
• D1 inch

For #4 deform steel rebar (nominal diameter 0.50 inches) used in pool shell structural mats, what is the minimum lap splice length required when plans specify a lap splice of 30 bar diameters?

• A12 inches
• B18 inches
• C15 inches
• D24 inches

Structural pool shell plans specify ASTM A615 Grade 60 steel rebar. What is the minimum yield strength of Grade 60 rebar?

• A40,000 psi
• B50,000 psi
• C75,000 psi
• D60,000 psi

What devices must be placed under the bottom rebar mat in a pool excavation to maintain the mandatory 3-inch clearance off the soil subgrade during shotcrete application?

• A3-inch precast concrete block chairs (dobies) with tie wires
• BBricks or pieces of broken cinder block
• CWooden 2x4 blocks left inside concrete
• DPlastic drinking cups inverted

What is the continuous structural concrete beam constructed around the top perimeter edge of a shotcrete pool wall to resist lateral soil and hydrostatic loads called?

• AGrade header
• BBond beam
• CCoping ledger
• DCrown joist

According to ACI 506.2, what is the maximum recommended center-to-center spacing for a single curtain of reinforcing steel in a shotcrete pool wall to avoid shadows and voids during nozzle placement?

• A6 inches
• B18 inches
• C12 inches
• D24 inches

Why must a 1/2-inch continuous horizontal expansion joint filled with flexible elastomeric sealant be installed between the pool coping/bond beam and the surrounding poured concrete deck?

• ATo allow water to drain under the coping into the pool
• BTo anchor the pool deck steel rebar directly into the pool wall
• CTo allow easy removal of pool coping during tile repair
• DTo isolate deck thermal expansion forces from pushing against the pool bond beam and crac…

How should steel rebar intersections be tied when constructing a pool structural cage prior to pneumatic concrete placement?

• ASecurely tied with 16-gauge black annealed wire at sufficient intersections to hold rebar…
• BWelded together at every single intersection
• CGlued using PVC solvent cement
• DHeld together with plastic zip-ties only

When erecting forms for a raised pool wall elevated 3 feet above surrounding grade, how must the exterior wood formwork be anchored to prevent form blowout during concrete placement?

• AWith 2-inch finish nails driven into topsoil
• BWith external strongbacks, diagonal kickers, walers, and snap-ties engineered to withstan…
• CRelying strictly on soil weight piled against form bottom
• DWith duct tape and plastic strapping

Standard 90-degree structural hooks on #4 pool rebar dowels must have a minimum straight extension at the free end of how many bar diameters per ACI 318?

• A4 bar diameters
• B6 bar diameters
• C12 bar diameters
• D24 bar diameters

How are vertical wall rebar steel mats structurally connected to the horizontal floor steel mat in a gunite pool shell?

• ASimple butt joints without overlap
• BSteel wire mesh unanchored at corners
• CEpoxy paste without steel continuity
• DContinuous L-shaped corner steel dowels spliced to both floor and wall mats

When pool plans are designed for highly expansive clay soils in Arizona, what steel reinforcement configuration is typically specified by structural engineers for pool walls?

• ADouble curtains (inner and outer mats) of #4 or #5 rebar spaced 6 to 8 inches OC
• BA single curtain of #3 rebar at 18 inches OC
• CNo rebar, using fiber mesh only
• DChicken wire netting pinned to dirt

Where PVC circulation pipes pass through the formed rebar cage of a pool wall prior to shotcrete application, what detail must be installed on the pipe to prevent water leaks along the pipe exterior?

• AGrease wrapped around the pipe
• BA flexible rubber or solvent-welded PVC waterstop flange collar in the center of the wall…
• CFiberglass insulation sleeves
• DLeaving a 2-inch open void around the pipe

For a 4-inch thick poured concrete pool deck slab, what is the maximum recommended spacing between contraction control joints per ACI 302.1R guidelines?

• A4 feet to 6 feet
• B15 feet to 18 feet
• C8 feet to 10 feet
• D20 feet to 24 feet

What precaution must be taken when applying form release oil to wooden pool wall forms prior to concrete placement?

• AApply release oil heavily directly over rebar
• BMix release oil into the concrete truck drum
• CSubstitute engine drain oil for form release
• DPrevent form release oil from coating steel rebar surfaces, as oil destroys concrete-to-s…

According to the International Swimming Pool and Spa Code (ISPSC), what is the minimum 28-day compressive strength (f'c) required for structural concrete used in swimming pool shells?

• A4,000 psi
• B2,500 psi
• C3,000 psi
• D5,000 psi

When testing fresh concrete delivered to a pool site per ASTM C143, what is the specified slump range for conventional cast-in-place pool structural walls before pumping?

• A1 to 2 inches
• B3 to 4 inches
• C6 to 8 inches
• D9 to 10 inches

To achieve watertight concrete with low permeability for swimming pool construction, ACI 350 recommends a maximum water-cementitious materials (w/cm) ratio of what value?

• A0.55
• B0.65
• C0.45
• D0.75

What target total air content percentage is required in concrete mix design for outdoor pool decks exposed to severe freeze-thaw cycles using 3/4-inch nominal maximum aggregate size?

• A1.0% to 2.0%
• B3.0% to 4.0%
• C10.0% to 12.0%
• D5.5% to 7.0%

During continuous placement of a poured concrete pool floor, what occurs if placement is delayed long enough for the previously placed concrete to begin setting before fresh concrete is consolidated against it?

• ACreating a structural cold joint that permits water leakage and structural weakness
• BForming an intentional expansion joint
• CIncreasing concrete compressive strength by 20%
• DPreventing rebar expansion

According to ACI 308, what is the minimum duration that structural concrete pool shell walls must be kept continuously moist during initial curing before applying pool plaster?

• A24 hours
• B7 days
• C3 days
• D28 days

What is the primary operational hazard of over-vibrating cast-in-place pool wall concrete with an internal spud vibrator?

• AConcrete density increases beyond allowable engineering limits
• BRebar melts from internal friction heat
• CSegregation of heavy coarse aggregates settling to the bottom and bringing excess bleed w…
• DConcrete setting time accelerates instantly

When pool concrete aggregates contain reactive silica minerals susceptible to Alkali-Silica Reaction (ASR), which supplementary cementitious material (SCM) is added to the mix to mitigate expansive gel formation?

• ACalcium chloride accelerator
• BHydrated lime powder
• CGypsum plaster
• DClass F Fly Ash or Silica Fume