Loading...
Northlake College-CS071019 From: To: CC: Date: Subject: Keith Marvin Blount, Jennifer White, David (Dallas) 10/19/2007 11:33 AM RE: DCCCD-NLC: Lime Stabilization Page 1 I I{1 0/19/2.(07) Keith Marvin - RE: DCCCD-NLC: Lime Stabilization . Jennifer, As long as the engineer of record for the civil design and the owner are in agreement with this request the City will not object. This does not vary the requirements for paving within the city right of way. Those areas should be constructed in accordance with our standard details. Keith Marvin, P.E. Project Engineer (972) 304-3681 >>> "Blount, Jennifer" <jennifer.blountCCiliacobs.com> 10/19/20079:19 AM >>> Mr. Marvin! You have been a great help resolving the lime stabilization question related to the DCCCD-NLC,NC project. After discussing with all involved the items you brought up, the question boils down to whether the City will allow a 6"/6" mix with 8% by dry weight lime content (36 pounds per square yard per 6-inch depth) in lieu of 8"/6" mix with 6% lime content. In other word, we would provide a slightly shallower subgrade with higher lime content. I attached the signed and sealed geotechnical report and addendum for your reference. I called and left you a message earlier and will try back later, if I don't hear from you sooner. Next week I will be out of the office, but David White will be available to discuss the issue should you have any questions. He may be reached at 214.424.7553. Hopefully, we can talk today. Thank you again for your assistance, Jennifer Jennifer Blount, EfT Jacobs 6688 North Central Expressway Suite 400, MB 13 Dallas, Texas 75206 p: 214.424.7505 f: 214.696.3499 iennifer. blountCCiliacobs.com -----Original Message----- From: Keith Marvin rmailto:kmarvinCCilci.coooell.tx.usl Sent: Monday, October 15, 2007 1:31 PM To: Blount, Jennifer Subject: RE: DCCCD-NLC: Lime Stabilization Jennifer, (10/19/2007) Keith Marvin - RE: DCCCD-NLC: Lime Stabilization Page 2 This report refers you to NCfCOG standard specifications item 4.6 which discusses lime treatment. This is a two step process in that document as well. As discussed, you may wish to pursue a valiance to the lime stabilization. We typically will waive the requirement if the engineer of record requests it, and provides an extra inch of concrete thickness. Keith Marvin, P.E. Project Engineer (972) 304-3681 >>> "Blount, Jennifer" <jennifer.blount@jacobs.com> 10/15/2007 12:47 PM >>> I apologize. I did not understand your question. Attached is the original geotechnical report. In Section 7.3 on page 12 of the report, the Geotech recommends that the pavement subgrade be stabilized with a minimum lime content of 8 percent by dry weight (36 pounds per square yard per 6-inch depth. This percentage is higher than that recommended in the Standard Construction Details. Thank you, Jennifer Jennifer Blount, Err Jacobs 6688 North Central Expressway Suite 400, MB 13 Dallas, Texas 75206 p: 214.424.7505 f: 214.696.3499 jennifer .blount@iacobs.com -----Original Message--n- From: Keith Marvin [mailto:kmarvin@ci.coooell.tx.usl Sent: Monday, October 15, 2007 12:33 PM To: Blount, Jennifer Cc: Michael Garza; Brenda Spinelli; James Williams; White, David (Dallas) Subject: RE: DCCCD-NLC: Lime Stabilization Jennifer, When we talked on the phone some time ago I was under the impression that you wanted to use a reduced amount of lime. Are you now indicating that you will use 6% lime and only mix one time? I could read the addendum just fine, but it states "Lime treatment should be performed in accordance with Section 7.3 of our geotechnical report." I don't know what section 7.3 says. Keith Marvin, P.E. Project Engineer (972) 304-3681 l 10/19/2007) Keith Marvin - RE: DCCCD-NLC: Lime Stabilization Page 3 >>> "Blount, Jennifer" <jennifer.blount(ii)iacobs.com> 10/15/200712:10 PM >>> Mr. Marvin, You are correct. The first page is a formal letter for record keeping purposes. I went ahead and attached the addendum from the geotechnical engineer separately for your reference. We are proposing the use of a 6-inch thick lime stabilized sUbgrade rather than the two-mix process ("Subgrade under all pavement shall be initially mixed 8" thick and re-mixed 6" thick and shall be stabilized with 6% minimum by weight of hydrated lime...") identified in the City's Standard Construction Details. Please let me know if the pdf is not transmitting correctly. I can always send a hardcopy. Thank you, Jennifer Jennifer Blount, EfT Jacobs 6688 North Central Expressway Suite 400, MB 13 Dallas, Texas 75206 p: 214.424.7505 f: 214.696.3499 jennifer .blount(ii)iacobs.com -----Original Message----- From: Keith Marvin [mailto:kmarvin(ii)ci.coooell.tx.usl Sent: Monday, October 15,2007 11:50 AM To: Blount, Jennifer Cc: Michael Garza; Brenda Spinelli; James Williams; White, David (Dallas) Subject: Re: DCCCD-NLC: Lime Stabilization Jennifer, I don't see what you are proposing to do. There is a reference to a report, but I don't have the report. Please include in your letter what the actual request is. This request then must be signed and sealed by the engineer of record on the project. Keith Marvin, P.E. Project Engineer (972) 304-3681 >>> "Blount, Jennifer" <jennifer.blount(ii)iacobs,com> 10/15/2007 11:03 AM >>> Mr. Marvin, I am forwarding to you the requested geotechnical letter we discussed over the phone October 1, 2007. The letter indicates a subgrade design for the Dallas County Community College District - North Lake, North Campus project that is different than the one stated in the City of Coppell's Standard Construction Details. I 10/19/2007) Keith Marvin - RE: DCCCD-NLC: Lime Stabilization Page 4 Please review this letter and geotechnical addendum and let us know if the modified subgrade design of 5-inches of Portland Cement Concrete placed on 6-inches of lime treated subgrade is acceptable to the City. I appreciate your help in this process and look forward to working with you to answer any questions. I may be reached at 214.424.7505. Thank you, Jennifer Jennifer Blount, Err, LEED(r) AP Jacobs 6688 North Central Expressway Suite 400, MB 13 Dallas, Texas 75206 p: 214.424.7505 f: 214.696.3499 jennifer .blount@iacobs.com This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail.