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Ten-foot internal drop at a Keller Road drainage inlet

Location

Drainage System 16 · Type G0 inlet, KEL 307+92.45, 34.58 ft LT

Merged in

3 related candidates

Observation. Drainage System 16 shows an 18-inch pipe entering the Type G0 drainage inlet at approximately invert 1558.25 and an 18-inch pipe leaving the same inlet at invert 1548.00. The inlet is labeled H = 14.2 ft, but no internal drop arrangement is identified.

Why it matters. An approximately 10.25-ft drop within a grated inlet may require a special structure or connection detail; leaving it unresolved could cause fabrication, hydraulic and field-installation problems.

Recommended next check. Confirm both pipe inverts and their entry points against the drainage plan and inlet detail; determine how the internal drop is intended to be constructed.

What the specialist flagged as uncertain. The profile establishes the apparent invert difference, but a separate detail may address the drop.

High-pressure gas beside the proposed 42-inch Keller drain

Location

Drainage System 10, west of Warner Lane

Sheets compared

D-8 and U-8

Observation. U-8 shows both 8-inch high-pressure and 8-inch plastic SCG gas lines along Keller Road west of Warner Lane. D-8 places the proposed 42-inch RCP of Drainage System 10 along this same south-side road corridor toward Warner Lane; neither plan gives a separation or trench-support condition for the parallel work.

Why it matters. A large storm-drain trench could encroach on the gas-line support zone and constrain construction or require SCG-approved protection.

Recommended next check. Measure common-station offsets, verify both gas-line depths, and compare the proposed RCP trench and shoring envelope with SCG clearance requirements.

What the specialist flagged as uncertain. The apparent parallel proximity does not establish a physical intersection; offsets and excavation limits need confirmation.

Water-line proximity to new bridge foundations is unresolved

Location

Keller Road UC abutments and retaining walls 307 / 308

Sheets compared

PS-9, PS-10 and bridge General Plan

Observation. PS-9 and PS-10 depict water lines along the Keller Road profile through the bridge area, including 12-inch and 24-inch lines on PS-10. The bridge General Plan shows 24-inch CIDH piles at both widening abutments and retaining walls 307 and 308 alongside the undercrossing. These views do not establish the utilities’ horizontal offsets from the proposed foundations.

Why it matters. A close utility-to-pile or wall-footing relationship could constrain foundation location, excavation, construction methods, or utility protection and relocation.

Recommended next check. Overlay utility plan locations and verified elevations with the CIDH pile and retaining-wall foundation footprints, including construction excavation envelopes.

What the specialist flagged as uncertain. The profiles alone do not show a clash; horizontal separation may resolve the concern.

Storm-drain clearance relies on an assumed SCE ductbank depth

Location

Drainage System 10, K2 alignment

Merged in

5 related candidates from other passes

Observation. The Drainage System 10 profile calls out an SCE ductbank with an assumed 42-inch depth in the area of the proposed storm-drain alignment. The profile does not establish a verified ductbank envelope or dimensioned clearance to the proposed pipework.

Why it matters. A deeper or larger existing ductbank could conflict with the storm drain and require utility protection, relocation, or a drainage-profile change during construction.

Recommended next check. Locate the ductbank crossing on the drainage and electrical plans, confirm surveyed or pothole elevations and ductbank dimensions, and calculate clearance to each proposed storm pipe at that location.

What the specialist flagged as uncertain. A conflict is not established; the concern is that the depicted clearance depends on an explicitly assumed utility depth.

About 8 inches between an electrical box and the 24-inch storm drain

Location

Line C, Sta. 40+89.40

Callouts

BOT box 2006.37 · TOP 24" SD 2005.70

Observation. The D-04 Line C profile calls out the bottom of a 1.0-by-1.5-foot concrete electrical box at elevation 2006.37 and the top of the 24-inch storm drain at elevation 2005.70 near station 40+89.40. The indicated vertical separation is approximately 0.67 foot (8 inches).

Why it matters. That separation may be insufficient for utility-owner clearance requirements or for constructing and protecting the pipe and box without conflict.

Recommended next check. Verify the crossing elevations and whether the callouts represent outside surfaces; compare the resulting clearance with the electrical utility’s requirements and the proposed construction details.

Line D pipe diameter differs between plan and profile: 12-inch or 24-inch?

Location

Line D, Sta. 50+00.00 to 55+19.31

Compare with

GN-01 drainage note 89

Observation. On D-05, the Line D plan appears to label the pipe beginning at station 50+00.00 and ending near station 55+19.31 as 12-inch RCP. The Line D profile labels the constructed runs along that alignment as 24-inch RCP (2000-D). GN-01 drainage construction note 89 also calls for 24-inch RCP per plan and profile.

Why it matters. The diameter determines hydraulic capacity, connections, structures, excavation, and pipe quantities; the plan and profile could direct different installations.

Recommended next check. Enlarge the two plan-end callouts and trace their leaders to confirm they refer to Line D, then reconcile the diameter against the profile, GN-01 note 89, and the connecting structures.

A second discipline, a different angle. The Cost / Quantity specialist reached the same callouts from the quantities side: GN-01 lists 24-, 36- and 54-inch RCP construction notes, but none for 12-inch RCP, so the work could be missed or measured under the wrong item.