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HomeMy WebLinkAbout3079; POINSETTIA LN BRIDGE CONSTRUCTION; CONTRACT PLAN ERRORS; 1984-09-240 0 . - . k ,CALCO CONSTRUCTION General Engineering Contractor ~( r/&67 ,36)-79 A JOINT VENTURE OF C . J. LUMSDAINE CO. WM. A. CORN — RCE#15483 September 24, 1984 DESIGN CONSTRUCTION MANAGEMENT ct~ Olt City of Carlsbad 1200 Elm Avenue Carlsbad, California 92008 Reference: POINSETTIA LANE BRIDGE ERRORS IN CONTRACT PLANS - DRAINAGE Attention: Pat Entezari Dear Pat: There have been many changes in the contract plans for the drainage on the above mentioned project, all of which have been approved by you. To provide details for the record, I have prepared this summary. If you have any differences from this summary, please notify me as soon as practical. The changes are listed numerically for reference with historical background and my summary of verbal agreement. 1. Realignment of 30" RCP from station 17 + 70, Poinsettia to the junction with temporary 24" RCP. After the layout had been completed for the 30" RCP in Poinsettia, the representative from SDG&E contacted CALCO and informed us that the 30" RCP as layout would conflict with the high pressure gas main as relocated. I contacted the resident engineer and we met at the site. Pot holes in the field verified that the relocated high pressure gas main did conflict with the 30" RCP as layout on the contract plans. The agreed solution was to extend the temporary 24" RCP eight feet to the north and rotate the alignment for the 30" RCP to intersect the eight foot extension, holding the pivot point as detailed on the contract plans station 17 + 70. The excavation had been completed to station 17 + 70 but it was not necessary to do.any regrading. 5245 AVENIDA ENCINAS, STE. G * P. 0. BOX 1171 * CARLSBAD, CA 92008 e (619) 434-3151 0 0 ALCO CONSTRUCTION General Engineering Contractor Pat Entezari City of Carlsbad September 24, 1984 Page Two There was no discussion addressing the question of time extension for delay or additional compen- sation for correcting the surveys or other extra costs such as extended duration of project. Design for cleanout structure of the junction of temporary 24'.' RCP and 30" RCP was incorrect. The subcontractor, Tadlock Structural Concrete, insisted that it was physically impossible to construct the structure as designed. After several meetings and enthusiastic discusssions, it was concluded that it was in fact impossible to construct the concrete structure as designed. The design was modified to enlarge the structure to accommodate all three RCP's. It was agreed to prorate the compensation based upon the cont ract unit price times actual calculated concrete quantity "As Built" divided by calculated theoretical quantity for structure as shown on contract drawings. There was an agreement relevant to the direct compensation for the error in plans, but no dis- cussion relative to time extension or other costs relating to extended project duration. Survey layouts in the field revealed th~t the location for the junction box for the intersection of the 24" RCP from the trailer park and the temporary 24" RCP was mislocated on the contract plans by eleven feet. The contract plans showed the inter- sect,ion as station 3 + 10 and the correct station i~ station 2 + 99. The error was corrected, approved by the resident engineer and there were no extra direct costs recorded. Survey layout in the field revealed that there was an error in the match line between'sheet 14 and sheet 15. The layout station at the end of sheet 14 is listed as station 10 + 75 and the same point is listed as station 10 + 65 on sheet 15.- There is P. 0. BOX 1171 * CARLSBAD, CA 92008 9 (619) 434-3151 0 0 'ALCO CONSTRUCTION General Engineering Contractor Pat Entezari City of Carlsbad September 24, 1984 Page Th-ree no equation listed, therefore; the stations were corrected for field layout for ,station 10 + 75 ahead. The resident engineer approved correction and there were no additio'nal direct costs recorded. Survey layouts in the field revealed that. there was an error in the layout of stations between station 9 + 00 and stations 13 + 50. The scaled distance between station 9 + 00 and 13 + 50 equaled app.rox- imately 373 feet. The field layoutladjusted to fit best with the adjacent features using the scale distance. The A-4 cleanout structures were set at station 10 + 75 and station 13 + 73 and the flowline elevation shown on plans were used for layout. The adjustments were approved by the resident engineer and there were no extra direct costs recorded. Survey layout in the field revealed that the end headwall on the existing 24" RCP as measured in the field is 83 feet closer to AT & SF Railroad than is measured on the contract plans. After consulting with the resident engineer, the layout line was adjusted to cross the railroad at a line parallel to the layout as detailed on the contract plans, joining the existing drainage at a point on a line parallel to the railroad the same distance from the railroad as the existing headwall (17 feet), and ten feet along the parallel line in a northwest direction from the existing headwall. The adjusted layout line was appfoved by represent- atives from AT & SF Railroad and the City of Carlsbad. There were no additional direct costs recorded. In the process of excavating for the temporary 24" RCP, there was encountered on September 7, 1984, a four inch high pressure gas main at station 17 + 65. The vent line above the gas main was damaged but the gas main was not damaged. P. 0. BOX 1171 * CARLSBAD, CA 92008 0 (619) 434-3151 9 0 ALCO CONSTRUCT101 General Engineering Contractor Pat Entezari City of Carlsbad September 24, 1984 Page Four The utility alert crew had cleared the area as having no additional lines other than those shown on contract plans. This line was not shown on the contract plans. S.D.G.&E. was notified and the crew examined the line to verify that it was not damaged and the excavation crew returned to work. The location of the line conflicted with location of the temporary 24" RCP and it was necessary to relocate (raise) the line where it crossed the 24" RCP to allow the drainage line to be installed. CALCO made arrangements to relocate the gas main and the problem was made known to the resident engineer. After several enthusiastic discussions, the resident engineer agreed to pay the relocation cost, but stated that he would not pay contractor's losses due to delays attributable to interferences, relocation or alterations, or losses for direct cost for a utility not shown on the contract plans or revealed by the utility alert procedure. The line was discovered 9/7/84 and relocation was completed 9/19/84. CALCO suffered a crew time loss during the discovery period for the excavation and the ten foot closure section will require a concrete lug. CALCO shall submit. under a separate cover the sum sought for compensation for direct cost, inter- to ference from utility crew, cost for right of way delay, the indirect cost for extension of work A/- period into the wet period of winter, cost for 10:1 extended duration of project, plus the required time extension. oe- In the processing of excavating for the temporary 24" RCP on September 10, 1984, it was revealed that the two telephone conduits crossing the 24" RCP were not as located on the contract plans. it appears as if the elevations as shown on the plans were the elevations "pot holed" in the field and surveyed as the top of the encasement but was P. 0. BOX 1171 e CARLSBAD, CA 92008 0 (619) 434-3151 0 0 ALCO CONSTRUCTION General Engineering Contractor Pat Entezari City of Carlsbad September 24, 1984 Page Five 8. incorrectly recorded or drafted as the elevation for the bottom of encasement. The fie-ld measure- ments indicated that telephone lines are much lower than detailed on the plans and conflict with the 24" RCP passing in a approximate 45.0 transverse direction below the telephone encasement. As the conditons exist in the field, the 24" RCP drainage pipe will pass below the southerly conduit but there is interference between the northerly conduit'and 24" RCP drainage pipe. There is a conflict in location of approximately five inches between the telephone encasement and the 24" RCP drainage pipe. After several enthusiastic discusssions, the res- ident engineer agreed that if there is a conflict between the utility and the contract work it is A/0 the city's responsibility to relocate the utility or.provide an alternate solution. In a meeting at the resident engineer's office, it was my conclusion that CALCO would place contract 24" RCP to each side of problem area and resident engineer would provide plans for a conduit to connect the two. The plans for conduit passing under utility being considered are to design a reinforced concrete box culvert, or do modification to the telephone encasement. It has been agreed between CALCO and the resident engineer to evaluate the costs for the conduit passing under the utility lines and negotiate to arrive at a mutually agreeable price before perform- ing work, or proceed in accordance with the contract specifications and pay for new and unforeseen work as "Extra Work". The error in plans was discovered 9/10/84 and+of 9/24/84 the resident engineer has not proposed a solution for correction of error. The resident engineer has at this point not recognized the merit of request for payment to contractor for additional costs directly related to,.rerror in the AR P. 0. BOX 1171 9 CARLSBAD, CA 92008 0 (619) 434-3151 0 ~ 0 ALCO CONSTRUCT101 General Engineering Contractor Pat Entezari City of Carlsbad September 24, 1984 Page Six location of a utility shown on the contract plans. The contractor will submit under a separate cover a claim for costs relating to direct costs for interference, direct cost for remedial work, cost for right of way delay, indirect cost for-extension of project into the wet period of winter, indirect cost for extended project duration and required time extensions. Review of the detail for the steel casing and 24" RCP to be jacked under the AT & SF revealed several conflicts or errors. These differences are: The representative from AT & SF insisted that the jacking installation comply with AT & SF drawing No. BECL 50-14 #106-6-141. This drawing conflicted with contract plans, in as much as the layout detailed only ten foot clearnace on the west side of railroad and the AT & SF drawings detailed 15' clearance. The AT & SF drawing detailed a RCP with a minimum strenth of 3000 D. and contract plans calls for 1350 D. The profile for the jacked pipe (sheet 15) detailed that the minimum clear distance from centerline of railroad should be 15 feet and' noted that the required distance to fulfill the required clearance is fifty feet. Ex- amination of the layout for the same jacked pipe on the profile revealed that a jacked length of fifty-eight (58) feet is required to provide the necessary clearance. The work in the field was accomplished by the following modifications: 3.1 The jacking pits were set at fifteen foot clearance and the required length of jacking was fifty-eight feet. 3.2 The requirement for increased strenth was covered by increasing the RCP from 1350 D to 2000 D and increasing the thickness of the steel casing. P. 0. BOX 1171 * CARLSBAD, CA 92008 0 (619) 434-3151 0 0 ALCO CONSTRUCT101 General Engineering Contractor Pat Entezari City of Carlsbad September 24, 1984 Page Seven 3. CALCO is requesting that they be compensated for the increased length as actually placed by the contract unit price and the contract unit price be adjusted to provide equitable compensation for the required increased cost for 2000 D RCP and thicker steel casing. HaT f~eexa A P PVI~ co We reserve the right to submit a claim for indirect costs directly relating to the extension of project duration. In the process of excavating for 24" RCP lateral that provides drainage for the trailer park, it was discovered that the location for the 24" RCP lateral conflicted with the 12" high pressure gas main. At the point where the lateral crosses the gas main, the flowline elevation is 45.53 and the bottom of the gas main is 45.94. It is impossible to construct as designed without lowering the gas main. At this point in time the resident engineer has not offered a solution. All work has been stopped on'this feature of work. The resident engineer notified CALCO at 5:00 PM on 9/13/84 that the angle point at station 11 + 80 had ~V-error of ten feet. Subsequential investigation on 9/14/84 revealed that there had indeed been a error of ten feet in the excavation for 24" RCP at station 11 + 80. A detail check revealed that the survey points were correct, but the contractor had made an error in the communications for setting of offset lines for the excavation crew. After communicating with the railroad, the resident engineer informed CALCO that the error must be corrected. Recognizing the urgency of the completion of the drainage to avoid problems with the upcoming wet season, the contractor (with resident engineer's- approval) worked a crew Saturday 9/15/84 to avoid extension of the duration of the schedule because of the error. P. 0. BOX 1171 e CARLSBAD, CA 92008 a (619) 434-3151 ALCO CONSTRUCT101 General Engineering Contractor Pat Entezari City of Carlsbad September 24, 1984 Page Eight The compensation of the first ten changes, all the results of errors in the plans, thus not only resulted in additional direct cost, but has extended the duration of-the project and may have push&dthe construction into the wet period of winter. I On complete evaluation of the effect of these changes can only be made after all the facts are in. Regards, W ~~m A. Partner lh P. 0. BOX 1171 e CA R LS BA D, CA 92008 0 (619) 434-3151