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Home My WebLink About02-00500233- 00075742 RABON i�ABON CALF ENGINEERING 19791 690 -0329 - HOME r POST OFFICE BOX 9253 ... (9791 690 -0329 - FAX COLLEGE STATION. TEXAS " 77842 (979) 219 -4174 - CELL / EMAIL RMFNGINEER@JUNO.COM February 12, 2003 Brett McCully, P.E. Assistant City Engineer City of College Station 1101 Texas Avenue South College Station, TX 77842 RE: R.M. Dudley Construction — Existing Wastewater Pressure Test Water Line Improvements - Block One, Lot 42, Harvey Hillside RME No. 121 -0147 Dear Brett: In accordance with TCEQ Chapter 290.44(e) — "Location of Water Lines ", the existing 15" VCT and 6" PVC sanitary sewer that parallels this project's proposed water line was determined not to shown signs or evidence of leakage by means of a low pressure air test. This pressure test was performed in accordance with Chapter 317.2(a)(3)(B) — "Low Pressure Air Test" and witnessed by me. This pressure test was performed on February 5 and 7 for the 6" PVC and 15" VCT sanitary sewer lines respectively. The reported findings are as follows when a stabilized air pressure of 5.0 psi was applied to each segment of line. Each segment of sanitary sewer line exhibited no measurable loss in air pressure. Stationing for each segment of sanitary sewer is based from the alignment of the proposed 8" PVC water line. Line Segment Location Length/Min Time Tested Time 15" VCT SS Line Sta. 0 +00 — Sta. 2 +90 294'/1570 sec (26 min) 26 min 6" PVC SS Line Sta. 2 +90 — Sta. 4+01 90'/398 sec (6.6 min) 10 min 6" PVC SS Line Sta. 4 +01 — Sta. 6 +44 244'/398 sec (6.6 min) 10 min 6" PVC SS Line Sta. 6 +44 — Sta. 8 +65 220'/398 sec (6.6 min) 10 min Please call should you have any questions or require assistance. Sincerely, ■ ,d i Ill -----) Rabon A. Metcalf, P.E. CD1-121-0147-L02 Page - 1 ENGINEER'S COST ESTIMATE WATER LINE IMPROVEMENTS HARVEY HILLSIDE BLOCK ONE, LOT 42 COLLEGE STATION, BRAZOS COUNTY, TEXAS UNIT TOTAL NO. I DESCRIPTION I QUANTITY I UNIT I COST ( COST 1 Mobilization, Traffic Control, & Trench Safety 1 LS $1,584.25 $1,584.25 2 8" PVC (C900 - DR 14 - Class 200) Water Line 353 LF $17.75 $6,265.75 w/Type "B" Backfill 3 6" PVC (C900 - DR 14 - Class 200) Water Line 384 LF $15.00 $5,760.00 w/Type "B" Backfill 4 8" (MJ) Gate Valve & Box 2 EA $700.00 $1,400.00 5 6" (MJ) Gate Valve & Box 5 EA $525.00 $2,625.00 6 Ductile Iron Fittings (Class 350) 1 LS $3,000.00 $3,000.00 7 Standard Fire Hydrant (Type 1 & 2) & 2 EA $2,150.00 $4,300.00 Appurtenances 8 15" Steel Encasement (Sch 40) w /8" DIP (Class 52) 40 LF $85.00 $3,400.00 Carrier Pipe w /Locking Joints & Casing Spacers 9 12" Steel Encasement (Sch 40) w /6" DIP (Class 52) 20 LF $70.00 $1,400.00 Carrier Pipe w /Locking Joints & Casing Spacers Creek Crossing (8" DIP Carrier Pipe, Erosion 10 Control Measures, Concrete Structure, Fittings, 20 LF $50.00 $1,000.00 Extra Compaction Effort) 11 Water Services 2 EA $375.00 $750.00 12 Silt Fencing 100 LF $5.00 $500.00 13 Asphalt Patch w /Cement Stabilized Sand Backfill 84 LF $40.00 $3,360.00 SUB -TOTAL = $35,345.00 This Engineer's Cost Estimate was prepared in this office, Q a, ° y, at the date shown, ub c of a tru ture aid is released ost projections. for the purpose of :•PTE O Ttr! • R a ........ ..1410 Rabon A. Metcalf, P.E Date 411 • ••• :l 88 f' RABON METCALF ENGINEERING = F� • POST OFFICE BOX 9253 k� ° • • •`' , \ COLLEGE STATION, TEXAS 77842 " CELL (979)219 -4174 E A ' r NF E R 1 G FAX: (979) 690 -0329 E- MAIL: RMIENGINEER@JUNO.COM CD1- 121 -0147 -E03 1 of 1 ENGINEER'S COST ESTIMATE WATER LINE IMPROVEMENTS HARVEY HILLSIDE BLOCK ONE, LOT 42 COLLEGE STATION, BRAZOS COUNTY, TEXAS UNIT TOTAL NO. I DESCRIPTION I QUANTITY I UNIT I COST I COST 1 Mobilization, Traffic Control, & Trench Safety 1 LS $1,584.25 $1,584.25 2 8" PVC (C900 - DR 14 - Class 200) Water Line 353 LF $17.75 $6,265.75 w/Type "B" Backfill 3 6" PVC (C900 - DR 14 - Class 200) Water Line 384 LF $15.00 $5,760.00 w/Type "B" Backfill 4 8" (MJ) Gate Valve & Box 2 EA $700.00 $1,400.00 5 6" (MJ) Gate Valve & Box 5 EA $525.00 $2,625.00 6 Ductile Iron Fittings (Class 350) 1 LS $3,000.00 $3,000.00 7 Standard Fire Hydrant (Type 1 & 2) & 2 EA $2,150.00 $4,300.00 Appurtenances 8 15" Steel Encasement (Sch 40) w /8" DIP (Class 52) 40 LF $85.00 $3,400.00 Carrier Pipe w /Locking Joints & Casing Spacers 9 12" Steel Encasement (Sch 40) w /6" DIP (Class 52) 20 LF $70.00 $1,400.00 Carrier Pipe w /Locking Joints & Casing Spacers Creek Crossing (8" DIP Carrier Pipe, Erosion 10 Control Measures, Concrete Structure, Fittings, 20 LF $50.00 $1,000.00 Extra Compaction Effort) 11 Water Services 2 EA $375.00 $750.00 12 Silt Fencing 100 LF $5.00 $500.00 13 Asphalt Patch w /Cement Stabilized Sand Backfill 84 LF $40.00 $3,360.00 SUB -TOTAL = $35,345.00 This Engineer's Cost Estimate was prepared in this office, at the date shown, an is released for the purpose of , `+A !M. C 1- ` N� ure e projections. , � �.� �.; .. • F «. ®� � r s —� * C / fit's Rabon A. Metcalf, P.E ate RABOs f f 1T--,, RABON METCALF ENGINEERING J I � , g am : o � "� g , if / t -- POST OFFICE BOX 9253 4 ' 1 A ' i _ COT,T,FGE STATION, TEXAS 77842 T �� ° l• Li -- CELL: (979) 219-4174 N ENL INF E 1 G FAX: (979) 690-0329 E - MAIL: RMENGINffit@JTINO.COM CD1- 121 -0147 -E03 1 of 1 �' \\ RABPosT o BOX 9253 ENGINEEIiING 19791 690 -0329 - HOME COLLEGE STATION. TEXAS 77842 19791 620 -0374 - FAX 19791219 -4174 - C'FI.i z i EMAIL BMFNGINEERLJUNO.COM January 15, 2003 Brett McCully, P.E. Assistant City Engineer City of College Station 1101 Texas Avenue South College Station, TX 77842 RE: R.M. Dudley Construction — Water Line Improvements — Hydraulic Analysis Block One, Lot 42, Harvey Hillside RME No. 121 -0147 Dear Brett: Please find attached the following findings and calculations for the above referenced project's water line improvements. This hydraulic analysis and the supporting design methods were performed in accordance with the City of College Station's development standards and specifications. Information used for the design and the resulting calculations, for the water line improvements, are as follows: ❖ A -1: COCS Public Utilities — Flow Test Report ❖ A -2: Hazen- Williams Evaluation Hydraulic Analysis The 5.36 -acre tract, currently platted as Lot 42, Block One of Harvey Hillside subdivision, is anticipated to be platted into two lots. The southern lot will be reserved for a single family residential residence. The northern lot, fronting State Highway No. 30, is anticipated to develop as a commercial /office building. The current conceptual Site Plan, provided by R.M. Dudley, proposes a two -story office building with a gross floor space of 22,000 ft The water line's domestic and fire flow demands will be based from this proposed data. Domestic Demand: Residential Development — 2,500 ft — Peak Demand = 15 gpm Commercial /Office Development — 22,000 ft — Appox. Peak Demand = 90 gpm Filename: CDI- 121 -0I47-L01 Page - 1 Fire Flow Demand: For residential development a fire flow demand of 500 gpm will be set as the requirement for the supplying fire hydrant. The Insurance Service Office provides a bases for the calculation of fire flows for commercial developments. This information is contained in the SPFC, Chapter 13 and is as follows: Fire Flow (Q) = 18C(A) C = Coefficient related to the type of construction —1. for ordinary construction A = Total floor area — 22,000 f Therefore, the required fire flow is: Q = 18 *1.0 *(22,000) = 2,670 gpm (round up or down by increments of 250) = 2,750 gpm ❖ ISO allows for a 50% reduction for buildings with automatic sprinkler systems; Q = 2,750 *0.50 = 1,375 gpm ❖ ISO requires an exposure protection value added to the fire flow; North Side >150 ft 0% increase South Side >150 fl 0% increase West Side 11 -30 ft 20% increase East Side 101 -150 ft 5% increase Total Increase = 25% Q = 1,375 + 1,375 *0.25 = 1,718 gpm (round up or down by increments of 250) = 1,750 gpm As calculated, the required fire flow for the commercial/office development will be 1,750 gpm. Design Results: Using the calculated domestic and fire flow conditions and existing water pressures in the area, the water line was appropriately sized. A summary of results for each condition is shown below in Table #1. The results illustrate the residual pressure when the coefficient of friction is equal to 100, therefore using the more conservative figures. ❖ Domestic Supply — This condition illustrates the hydraulic conditions of the water system improvements with both proposed developments at peak demand; ❖ Condition #1 — This analysis illustrates the results of fire flow conditions for the proposed commercial development. The fire service to commercial development will be shared by a proposed fire hydrant located in the middle of the commercial tract and the existing fire hydrant in the southeast corner of the intersection of S.H. 30 and Pamela Lane; ❖ Condition #2 — This scenario reports the fire flow demands and hydraulic results for the fire service to the residential development. The required fire flow is delivered completely at the proposed fire hydrant located and the end of the improvements. Filename: CD1- 121 -0147 -L01 Page - 2 TABLE #1 - WATER LINE DESIGN SUMMARY 8" Line Segment 6" Line Segment Demand Velocity Pressure Demand Velocity Pressure Scenerio (gpm) (fps) (psi) (gpm) (fps) (psi) Domestic Flow 105 0.67 101.66 15 0.17 95.15 Fire Flow Condition #1 890 5.69 62.80 15 0.17 56.29 Fire Flow Condition #2 590 3.77 64.89 50 5.68 52.09 The attached engineering calculations are issued for the before stated water line improvements and are issued by me and are applicable to this project. Please call should you have any questions or require assistance. Sincerely, 1 Rabon A. Metcalf, P.E. \ Ow --I— • • N j . . '1:1 . .41 0 51:11 t 7 5' dz1/4, .0 . /.40--.. - Filename: CD1- 121 -0147 -L01 Page - 3 r►1 • 1O uu3 14:07 Fit .979 764 34SX '`OLL€GE .STATION au/ Water is Life Paver s S el Pr Eallege tatiorr p0101 weak C .4 erc PUBLIC UTLLITIES DEPARTMENT 1601 GRAHAM ROAD COr.r.:GE STATION TEXAS 77845 Date: 10 JAN 03 Number pages including cover sheet - 1 Fax ro: 690 -0329 Attention: RAYBURN METCALF Company: From. Butch Willis Water Wastewatcl Division Phone: 979-764 -3435 Fax: 979 - 764 -3452 FLO W TEST REPORT Location: KOPPIE BRIDGE Flow hydrant number: G-013 Pitot reading: 75 (GPM): /140 Static hydrant number: G -035 Static PSI: 100 Residual PSI: 65 HARVEY HILLISIDE WATER LINE IMPROVEMENTS Hazen - Williams DOMESTIC SUPPLY HEAD FRICTION STATIC RESIDUAL 1 FLOW FLOW DIST. ID C LOSS LOSS VELOCITY HEAD TDH PRESSURE i •.m cfs ft in VALUE ft/100 ft f•s ft ft asi I 105.0 0.23 375 8 140 0.02 0.09 0.67 -4.00 -3.91 101.6 15.0 0.03 430 6 140 0.00 0.01 0.17 11.00 11.01 95.19 105.0 0.23 375 8 100 0.05 0.17 0.67 -4.00 -3.83 101.66 , 15.0 0.03 430 6 100 0.01 0.02 0.17 11.00 11.02 95.15 Static Pressure (psi) = 100.00 FIRE FLOW SUPPLY - CONDITION #1 (1,750 GPM @ OFFICE BUILDING) HEAD FRICTION STATIC RESIDUAL FLOW FLOW DIST. ID C LOSS LOSS VELOCITY HEAD TDH PRESSURE (gpm) (cfs) (ft) (in) VALUE (ft/100) (ft) (fps) (ft) (ft) (psi) 890.0 1.98 375 8 140 1.30 4.87 5.69 -4.00 0.87 64.62 15.0 0.03 430 6 140 0.00 0.01 0.17 11.00 11.01 58.11 890.0 1.98 375 8 100 2.42 9.08 5.69 -4.00 5.08 62.80 15.0 0.03 430 6 100 0.01 0.02 0.17 11.00 11,02 56.2 Residual Pressure (psi) = 65.00 FIRE FLOW SUPPLY - CONDITION #2 (500 GPM @ RESIDENTIAL) HEAD FRICTION STATIC RESIDUAL FLOW FLOW DIST. ID C LOSS LOSS VELOCITY HEAD TDH PRESSURE (gem) (cfs) (ft) (in) VALUE (ft/100) (ft) (fps) (ft) (ft) (psi) 590.0 1.31 375 8 140 0.61 2.28 3.77 -4.00 -1.72 65.75 500.0 1.11 430 6 140 1.82 7.81 5,68 11.00 18.81 55.86 590.0 1.31 375 8 100 1.13 4.24 3.77 -4.00 0.24 64.89' 500.0 1.11 430 6 100 3.38 14.55 5.68 11.00 25.55 52.09 Residual Pressure (psi) = 65.00 121 -0147 Hydraulic Anaylsis ENGINEER'S COST ESTIMATE WATER LINE IMPROVEMENTS HARVEY HILLSIDE BLOCK ONE, LOT 42 COLLEGE STATION, BRAZOS COUNTY, TEXAS UNIT TOTAL NO. I DESCRIPTION I QUANTITY I UNIT I COST I COST 1 Mobilization, Traffic Control, & Trench Safety 1 LS $1,584.25 $1,584.25 2 8" PVC (C900 - DR 14 - Class 200) Water Line 373 LF $17.75 $6,620.75 w/Type "B" Backfill 3 6" PVC (C900 - DR 14 - Class 200) Water Line 384 LF $15.00 $5,760.00 w/Type "B" Backfill 4 8" (MJ) Gate Valve & Box 2 EA $700.00 $1,400.00 5 6" (MJ) Gate Valve & Box 5 EA $525.00 $2,625.00 6 Ductile Iron Fittings (Class 350) 1 LS $3,000.00 $3,000.00 7 Standard Fire Hydrant (Type 1 & 2) & 2 EA $2,150.00 $4,300.00 Appurtenances 8 15" Steel Encasement (Sch 40) w /8" DIP (Class 52) 20 LF $85.00 $1,700.00 Carrier Pipe w /Locking Joints & Casing Spacers 9 12" Steel Encasement (Sch 40) w /6" DIP (Class 52) 20 LF $70.00 $1,400.00 Carrier Pipe w /Locking Joints & Casing Spacers Creek Crossing (8" DIP Carrier Pipe, Erosion 10 Control Measures, Concrete Structure, Fittings, 20 LF $50.00 $1,000.00 Extra Compaction Effort) 11 Water Services 2 EA $375.00 $750.00 12 Silt Fencing 100 LF $5.00 $500.00 13 Asphalt Patch w /Cement Stabilized Sand Backfill 84 LF $40.00 $3,360.00 SUB -TOTAL = $34,000.00 This Engineer's Cost Est ate was prepared in this office, \ at the date shown, and . released for the purpose of OF " � P�. W �' li Anar • - w ure c • - projections. � ,'� .• • . ' 2 0 � Ra••n A. Metcalf, P.E \ Date' ' '' 1 1�+�� v 1 (` RABON METCALF' ENGINEERING : I' _ , ® POST OFFICE BOX 9253 ` 1 FS al L E4, a 1 1 COT,T,FGE STATION. TEXAS 77842 ��° Jr q �_ ' � : , L CELL (979) 219 -4174 4,,-, N O NF ER rT crb FAX: (979) 690 -0329 E- MAIL: ' MENGINEER @JITNO.COM CD1- 121 -0147 -E02 1 of 1 ENGINEER'S COST ESTIMATE WATER LINE IMPROVEMENTS HARVEY HILLSIDE BLOCK ONE, LOT 42 COLLEGE STATION, BRAZOS COUNTY, TEXAS NO. 1 1 DESCRIPTION QUANTITY UNIT COST TOTAL t OST , 1 Mobilization, Traffic Control, & Trench Safety 1 LS $985.00 $985.00 2 8" PVC (C900 - DR 14 - Class 200) Water Line 780 LF $17.75 $13,845.00 w/Type "B" Backfitl 3 8" (MJ) Gate Valve & Box 2 EA $740.00 $1,400.00 4 6" (MJ) Gate Valve & Box 4 EA $525.00 $2,100.00 5 Ductile Iron Fittings (Class 350) 1 LS $1,800.00 $1,800.00 , 6 Standard Fire Hydrant (Type 1 & 2) & 2 150 $4,300.00 Appurtenances 7 15" Steel Encasement (Sch 40) w18" DIP (Class 52) 10 LF $85.00 $850.00 Carrier Pipe w1Loc king Joints & Casing Spacers Creek Crossing (8" DIP Carrier Pipe, Erosion Control 8 Measures, Concrete Structure, Fittings, Extra 1 EA $1,750.00 $1,750.00 Compaction Effort) 9 Silt Fencing 114 LF $5.00 $570.00 10 Cement Stabilized Sand Backfill 20 LF $25.00 $500.00 SUB -TOTAL = $28,100.00 This Engineer's Cost Estimate was prepared in this office, -t the date shown, and 1 _ released for the purpose of pu • is infras • re co projections. MIS A Rabon A. Metcalf, P.E „ a te t . \ ° ° � + 4 ' � �t (� `�.._ RABON METCALF ENGINEERING RABON A. MtETCA F �. / '\ POST OFFICE BOX 9253 1 COI I FGE STATION. TEXAS AS 77842 ) F "��' ° • , _; .�'� �S / ONA , �U , v : ti CFI I; 19793 239 -4174 \ X g � 14 �-� G t NE ER 11'16 FAX: !9?93 690-0329 E-MAIL: RIvfENGINEERi NO.CON4 CD1- 121 -0147 -E01 1 of 1