Review-first estimate
Every line item below points back to the drawing or spec it came from, declares a confidence band, and flags what still needs your review. Diffs show the correction an estimator made after sanity-checking the prediction. None of this numbers magic comes from us — it comes from the extraction trail, the reviewer, and the spec.
Spec section 02 31 23 references a bypass plan but the mainline profile on C-301 does not show existing service to be kept in operation. Flow rates and duration are estimator judgement calls — BuildBid intentionally left this blank rather than guess.
Suggested scope to add manually: Add 1 LS bypass pumping (4" pumps + hose + fuel + monitoring) once estimator confirms active sewer tie-in staging.
1,420 LF · $62.00/LF · $88,040
Measurement basis
1,420 LF extracted from mainline pipe callouts.
Needs estimator check because…
Routine spot-check recommended. No specific risk flagged.
Predicted
1,420 LF
$88,040
Corrected
1,420 LF
$88,040
Mock diff — replace with real estimator correction history.
1,380 LF · $72.00/LF · $99,360
Measurement basis
1,380 LF extracted from mainline pipe callouts.
Needs estimator check because…
Routine spot-check recommended. No specific risk flagged.
Predicted
1,380 LF
$99,360
Corrected
1,380 LF
$99,360
Mock diff — replace with real estimator correction history.
848 LF · $85.00/LF · $72,080
Measurement basis
848 LF extracted from mainline pipe callouts.
Needs estimator check because…
Review quantity against your own measurement before bidding.
Predicted
848 LF
$72,080
Corrected
848 LF
$72,080
Mock diff — replace with real estimator correction history.
300 LF · $98.00/LF · $29,400
Measurement basis
Aggregated from profile callouts on sheet C-301; depth band split inferred from invert elevations at MH-12 through MH-16.
Needs estimator check because…
Depth band 10-12' boundary depends on finished grade at STA 21+50, which is shown on civil C-102 but not cross-referenced on the profile. Verify before bidding deeper trench rate.
Predicted
300 LF
$29,400
Corrected
265 LF
$25,970
Estimator re-measured profile; 35 LF fell into 8-10' band after grade correction.
1,650 LF · $48.00/LF · $79,200
Measurement basis
1,650 LF extracted from mainline pipe callouts.
Needs estimator check because…
Routine spot-check recommended. No specific risk flagged.
Predicted
1,650 LF
$79,200
Corrected
1,650 LF
$79,200
Mock diff — replace with real estimator correction history.
1,328 LF · $56.00/LF · $74,368
Measurement basis
1,328 LF extracted from mainline pipe callouts.
Needs estimator check because…
Routine spot-check recommended. No specific risk flagged.
Predicted
1,328 LF
$74,368
Corrected
1,328 LF
$74,368
Mock diff — replace with real estimator correction history.
900 LF · $68.00/LF · $61,200
Measurement basis
900 LF extracted from mainline pipe callouts.
Needs estimator check because…
Review quantity against your own measurement before bidding.
Predicted
900 LF
$61,200
Corrected
900 LF
$61,200
Mock diff — replace with real estimator correction history.
3,200 LF · $38.00/LF · $121,600
Measurement basis
3,200 LF extracted from laterals & service callouts.
Needs estimator check because…
Routine spot-check recommended. No specific risk flagged.
Predicted
3,200 LF
$121,600
Corrected
3,200 LF
$121,600
Mock diff — replace with real estimator correction history.
80 EA · $285.00/EA · $22,800
Measurement basis
80 EA extracted from laterals & service callouts.
Needs estimator check because…
Routine spot-check recommended. No specific risk flagged.
Predicted
80 EA
$22,800
Corrected
80 EA
$22,800
Mock diff — replace with real estimator correction history.
71 EA · $165.00/EA · $11,715
Measurement basis
71 EA extracted from laterals & service callouts.
Needs estimator check because…
Routine spot-check recommended. No specific risk flagged.
Predicted
71 EA
$11,715
Corrected
71 EA
$11,715
Mock diff — replace with real estimator correction history.
71 EA · $78.00/EA · $5,538
Measurement basis
71 EA extracted from laterals & service callouts.
Needs estimator check because…
Routine spot-check recommended. No specific risk flagged.
Predicted
71 EA
$5,538
Corrected
71 EA
$5,538
Mock diff — replace with real estimator correction history.
478 VF · $310.00/VF · $148,180
Measurement basis
Manhole VF = sum of (rim elev - invert elev) for 53 structures from profile sheets C-301 through C-303.
Needs estimator check because…
Profile sheets are clean and fully dimensioned. Spot-check 3 random structures against your own measurement.
Predicted
478 VF
$148,180
Corrected
478 VF
$148,180
No correction needed — matched estimator manual takeoff.
53 EA · $1850.00/EA · $98,050
Measurement basis
53 EA extracted from manholes callouts.
Needs estimator check because…
Routine spot-check recommended. No specific risk flagged.
Predicted
53 EA
$98,050
Corrected
53 EA
$98,050
Mock diff — replace with real estimator correction history.
53 EA · $625.00/EA · $33,125
Measurement basis
53 EA extracted from manholes callouts.
Needs estimator check because…
Routine spot-check recommended. No specific risk flagged.
Predicted
53 EA
$33,125
Corrected
53 EA
$33,125
Mock diff — replace with real estimator correction history.
8 EA · $2200.00/EA · $17,600
Measurement basis
Counted from drop-connection symbol in structure schedule on C-401. 8 symbols visible; legend confirms detail 3/C-402.
Needs estimator check because…
Two drop assemblies on the east branch may be standard connections — symbol is identical and only the profile call-out distinguishes them. Confirm with civil engineer.
Predicted
8 EA
$17,600
Corrected
6 EA
$13,200
RFI confirmed 2 of the 8 are standard connections, not drops.
3,940 TN · $28.50/TN · $112,290
Measurement basis
3,940 TN extracted from bedding & backfill callouts.
Needs estimator check because…
Routine spot-check recommended. No specific risk flagged.
Predicted
3,940 TN
$112,290
Corrected
3,940 TN
$112,290
Mock diff — replace with real estimator correction history.
5,200 TN · $18.00/TN · $93,600
Measurement basis
Backfill volume computed from trench width (3.5'), depth bands, and total mainline LF. Convert to tons at 1.35 T/CY.
Needs estimator check because…
Select granular backfill requirement depends on soil report section 3.2 — current assumption is 100% import. If on-site material passes, backfill qty drops by ~40%.
Predicted
5,200 TN
$93,600
Corrected
3,100 TN
$55,800
Geotech report allowed native soil reuse above pipe zone.
7,826 LF · $4.50/LF · $35,217
Measurement basis
7,826 LF extracted from bedding & backfill callouts.
Needs estimator check because…
Routine spot-check recommended. No specific risk flagged.
Predicted
7,826 LF
$35,217
Corrected
7,826 LF
$35,217
Mock diff — replace with real estimator correction history.
180 LF · $385.00/LF · $69,300
Measurement basis
180 LF extracted from jack & bore / crossings callouts.
Needs estimator check because…
Review quantity against your own measurement before bidding.
Predicted
180 LF
$69,300
Corrected
180 LF
$69,300
Mock diff — replace with real estimator correction history.
4 EA · $4500.00/EA · $18,000
Measurement basis
4 EA extracted from jack & bore / crossings callouts.
Needs estimator check because…
Review quantity against your own measurement before bidding.
Predicted
4 EA
$18,000
Corrected
4 EA
$18,000
Mock diff — replace with real estimator correction history.
4,852 LF · $54.00/LF · $262,008
Measurement basis
4,852 LF extracted from outfall sewer callouts.
Needs estimator check because…
Review quantity against your own measurement before bidding.
Predicted
4,852 LF
$262,008
Corrected
4,852 LF
$262,008
Mock diff — replace with real estimator correction history.
18 EA · $6800.00/EA · $122,400
Measurement basis
18 EA extracted from outfall sewer callouts.
Needs estimator check because…
Review quantity against your own measurement before bidding.
Predicted
18 EA
$122,400
Corrected
18 EA
$122,400
Mock diff — replace with real estimator correction history.
1 LS · $28500.00/LS · $28,500
Measurement basis
Lump-sum estimate from headwall detail 1/C-501 and creek section on C-502. Priced as single scope.
Needs estimator check because…
Creek crossing permit scope (USACE 404) is referenced on sheet G-001 general notes but not fully specified. Permit / mitigation costs may be owner-furnished or contractor-furnished — verify with specs division 02 41 13.
Predicted
1 LS
$28,500
Corrected
1 LS
$42,000
Added $13,500 for USACE permit fees and turbidity curtain per spec 02 41 13.
1 LS · $32000.00/LS · $32,000
Measurement basis
1 LS extracted from site work & restoration callouts.
Needs estimator check because…
Review quantity against your own measurement before bidding.
Predicted
1 LS
$32,000
Corrected
1 LS
$32,000
Mock diff — replace with real estimator correction history.
2,800 SF · $12.50/SF · $35,000
Measurement basis
2,800 SF extracted from site work & restoration callouts.
Needs estimator check because…
Review quantity against your own measurement before bidding.
Predicted
2,800 SF
$35,000
Corrected
2,800 SF
$35,000
Mock diff — replace with real estimator correction history.
4.2 AC · $3800.00/AC · $15,960
Measurement basis
4.2 AC extracted from site work & restoration callouts.
Needs estimator check because…
Routine spot-check recommended. No specific risk flagged.
Predicted
4.2 AC
$15,960
Corrected
4.2 AC
$15,960
Mock diff — replace with real estimator correction history.
1 LS · $45000.00/LS · $45,000
Measurement basis
Contractor-furnished dewatering allowance per general note 14, sheet G-003. No specific volume quantified.
Needs estimator check because…
Allowance may be under-sized for the 10-12' sections near the creek. Estimator judgement required — no plan data supports a specific number.
Predicted
1 LS
$45,000
Corrected
1 LS
$62,000
Estimator raised allowance based on prior project near similar water table.
1 LS · $18000.00/LS · $18,000
Measurement basis
1 LS extracted from site work & restoration callouts.
Needs estimator check because…
Review quantity against your own measurement before bidding.
Predicted
1 LS
$18,000
Corrected
1 LS
$18,000
Mock diff — replace with real estimator correction history.
7,826 LF · $2.25/LF · $17,609
Measurement basis
7,826 LF extracted from testing & qc callouts.
Needs estimator check because…
Routine spot-check recommended. No specific risk flagged.
Predicted
7,826 LF
$17,609
Corrected
7,826 LF
$17,609
Mock diff — replace with real estimator correction history.
7,826 LF · $1.75/LF · $13,696
Measurement basis
7,826 LF extracted from testing & qc callouts.
Needs estimator check because…
Routine spot-check recommended. No specific risk flagged.
Predicted
7,826 LF
$13,696
Corrected
7,826 LF
$13,696
Mock diff — replace with real estimator correction history.
71 EA · $185.00/EA · $13,135
Measurement basis
71 EA extracted from testing & qc callouts.
Needs estimator check because…
Routine spot-check recommended. No specific risk flagged.
Predicted
71 EA
$13,135
Corrected
71 EA
$13,135
Mock diff — replace with real estimator correction history.
1 LS · $65000.00/LS · $65,000
Measurement basis
1 LS extracted from general conditions callouts.
Needs estimator check because…
Routine spot-check recommended. No specific risk flagged.
Predicted
1 LS
$65,000
Corrected
1 LS
$65,000
Mock diff — replace with real estimator correction history.
1 LS · $22000.00/LS · $22,000
Measurement basis
1 LS extracted from general conditions callouts.
Needs estimator check because…
Routine spot-check recommended. No specific risk flagged.
Predicted
1 LS
$22,000
Corrected
1 LS
$22,000
Mock diff — replace with real estimator correction history.
1 LS · $15000.00/LS · $15,000
Measurement basis
1 LS extracted from general conditions callouts.
Needs estimator check because…
Routine spot-check recommended. No specific risk flagged.
Predicted
1 LS
$15,000
Corrected
1 LS
$15,000
Mock diff — replace with real estimator correction history.
1 LS · $38000.00/LS · $38,000
Measurement basis
1 LS extracted from general conditions callouts.
Needs estimator check because…
Routine spot-check recommended. No specific risk flagged.
Predicted
1 LS
$38,000
Corrected
1 LS
$38,000
Mock diff — replace with real estimator correction history.