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ST0701-CS080519 (8/30/2011) Keith Marvin - Fwd: RE: Southwestern Blvd. 24" Water Line at BridgePage 1 From: Keith Marvin To:Smith, Madonna CC:Littleton, Dave Date: 5/19/2008 4:02 PM Subject: Fwd: RE: Southwestern Blvd. 24" Water Line at Bridge FYI... Keith Marvin, P.E. Project Engineer (972) 304-3681 >>> Glenn Hollowell 5/19/2008 3:55 PM >>> Keith, I think you are probably aware of this but my main concern about clearances is for future repairs to the water line. We would need to have at least 5' of clearance on all sides of the pipe. If we had to repair a leak in this line, our trench line would probably be 20' wide at the top of the excavation. If we disturbed the soil up to twenty feet deep next to a bridge pier, could this cause structural problems with the pier itself. If we had piers straddling the water line, we could hurt the integrity of two piers. I do not have enough information to make a judgement on this matter. If the bridge is going to be sitting on 100' pilings, this probably would not be a problem. If it is sitting on 50' pilings, it could be a huge problem. If the bridge abutment is going to be sitting on spread footings, it may or may not be a problem. I do not know enough about the design of the bridge. this is the main reason I was wanting to shift the bridge further to the north. Has anyone considered building a small driveway type road around the outside of the bridge approaches in order to access these properties. Check in to this and let me know what you find out. Thanks, Glenn Glenn D. Hollowell, P.E. Assistant Director of Public Works 972-462-5150 ghollow@ci.coppell.tx.us >>> Keith Marvin 5/19/2008 3:31 PM >>> We want to make sure that we have vertical clearance to excavate down to the line in the event we need to make a repair. If the abutment is clear, however the deck or beams overhangs the line we may still have a problem. I guess we will know for sure once we locate the line. Keith Marvin, P.E. Project Engineer (972) 304-3681 >>> "Smith, Madonna" <msmith@Halff.com> 5/19/2008 2:15 PM >>> Dave and I agree that if we move the bridge to the north, we won't be able to provide access to the first few residences on the northeast side. Our structures group assures me they can modify the abutment to clear the waterline once we pinpoint the horizontal location. The pipe is 15' to 20' deep at the creek. -----Original Message----- From: Keith Marvin [mailto:kmarvin@ci.coppell.tx.us] Sent: Monday, May 19, 2008 10:09 AM To: Smith, Madonna Cc: Glenn Hollowell; Littleton, Dave (8/30/2011) Keith Marvin - Fwd: RE: Southwestern Blvd. 24" Water Line at BridgePage 2 Subject: RE: Southwestern Blvd. 24" Water Line at Bridge What was the outcome of your discussion with Dave about shifting the bridge? Keith Keith Marvin, P.E. Project Engineer (972) 304-3681 >>> "Smith, Madonna" <msmith@Halff.com> 5/19/2008 9:38 AM >>> Ok. I will schedule the locate ASAP. Once we know the exact location of the waterline, we can modify the abutment without moving the bridge location. -----Original Message----- From: Keith Marvin [mailto:kmarvin@ci.coppell.tx.us] Sent: Friday, May 16, 2008 8:15 AM To: Smith, Madonna Cc: Glenn Hollowell; Littleton, Dave Subject: RE: Southwestern Blvd. 24" Water Line at Bridge Madonna, Our Public Works folks have some concerns about the proximity of the bridge to the 24" water line. Their specific question was "why can't the bridge shift north?" In looking back through my notes, I know we were trying to minimize grades on the drives east of the bridge, but I don't know if there were other reasons too. Is there a compelling reason we can not shift the bridge to a point where they have at least 5 feet clear between this water line and the abutment? I think we want to avoid the expense of relocating this line if it's possible. After talking this over with Dave, and looking at your options, if you still want to send your field crew out to tie this line down, we will authorize the additional expense. Thanks, Keith Keith Marvin, P.E. Project Engineer (972) 304-3681 >>> "Smith, Madonna" <msmith@Halff.com> 5/15/2008 3:46 PM >>> Ok. Sounds good. Thank you for the prompt response. Madonna -----Original Message----- From: Keith Marvin [mailto:KMARVIN@ci.coppell.tx.us] Sent: Thursday, May 15, 2008 3:46 PM To: Smith, Madonna (8/30/2011) Keith Marvin - Fwd: RE: Southwestern Blvd. 24" Water Line at BridgePage 3 Cc: Littleton, Dave Subject: Re: Southwestern Blvd. 24" Water Line at Bridge I have not been able to view the attachment, but I have sent it on to our public works department for review. If we have more accurate information I will send it to you. We will also go out to the field and investigate this location. We have a vac truck, and we may be able to expose the line and have your surveyor come out and take some shots on it. I'm in class today and tomorrow, but I'll get back with you either tomorrow afternoon or Monday. Keith -----Original Message----- From: "Smith, Madonna" <msmith@Halff.com> To: Keith Marvin <KMARVIN@ci.coppell.tx.us> Cc: Dave Littleton <dlittleton@halff.com> Sent: 5/15/2008 1:02:04 PM Subject: Southwestern Blvd. 24" Water Line at Bridge Keith, The attached .pdf shows the Southwestern Blvd. proposed bridge abutment shaft and the 24" water to be very close to one another. The 24" is shown based on record information from the City and field surveyed valve locations. The pdf is not to scale, but there is less than 1' of clearance between the two. It may be possible to modify the abutment to avoid the water main, but we will need to know the exact horizontal location of the pipe. The alternative would be to relocate a portion of the 24" water main in Southwestern to eliminate the conflict with the proposed bridge abutment. I can, with your approval, have our SUE group perform the locate. We do not have a budget in the contract for this type of work, and I've received an estimate of $2,000 max to locate the water main. The maximum fee is based on needing to use the vac truck due to the excessive depth (15 ft) at this location. I will call you to follow up and get your direction on how you would like us to proceed. Thanks, Madonna Madonna Smith, P.E. Project Manager HALFF ASSOCIATES, INC. 1201 N. Bowser Road Richardson, Texas 75081 Phone 214-217-6688 Fax 214-739-0095 www.halff.com ( http://www.halff.com/ )