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Park West Lot 1 Blk 3R- CS150414ALFF" 1201 North Bowser Road Richardson, Texas 75081 (214) 346-6200 Fax (214) 739-0095 LETTER OF TRANSMITTAL To: City of Coppell - Engineering Date: April 14, 2015 265 Parkway Blvd. Coppell, Texas 75019 Attn: Mike Garza From: Hunter Starkey, P.E. AVO: 29928 Email: hstarkey@halff.com ri V_ Klr <;' ` 6 � L'oT -L 39 WE ARE SENDING YOU ❑Attached ❑ Under separate cover via _ the following: ❑ Shop Drawings ❑ Prints ® Plans ❑ Drawings ❑ Specifications ❑ Copy of letter ❑ Report(s) ❑ CD/DVD ❑ Other: VIA: ❑Hand Delivery ❑US Postal Service ®Courier ❑Overnight Express THESE ARE TRANSMITTED ED as checked below- ® For approval ❑ Approval as submitted ❑ Resubmit— copies for approval ❑ For your use ❑ Approved as noted ❑ Submit copies for distribution ❑ As requested ❑ Returned for corrections ❑ Return corrected prints ® For review/comment ❑ Other: ITEMS SENT: • 2 full-size sets of the Park West Crossing Drainage Improvement plans for 2nd submittal review • 1 Comment Response Letter for Civil Plans • 1 letter requesting postponement of mitigation along with development of future buildings • Original Red Line Drawings received from City of Coppell BOTNTAIMN SIGNED: Hunter Starkey, P.E. COPIES: ® File ® Owner ® Contractor ❑ Other: U °f Halff Associates, Inc. 1201 North Bowser Road Richardson, Texas 75081 (214) 346-6200 Fax (214) 739-0095 MEMORANDUM TO: Mike Garza, P.E. DATE: 4/14/2015 City of Coppell FROM: Hunter Starkey, PE AVO: 29928 EMAIL: hstarkey@halff.com SUBJECT: Comment Response to Drainage Improvement Plans for Park West Commerce Center Please see below for a brief breakdown of the comments received from the first submittal of the above referenced project: • Title page o The word "Crossing" eliminated from title • C1.01 o Contour label size increased. o Floodplain note added • C1.02 o street name added o Elevations for the properties to the west and the east of the channel are proposed to remain unchanged (with the exception that after the stockpile to the west is used this area is sloped to drain). The 2 stubouts are intended to be plugged for future use. When these adjoining properties are developed, the flow of these 2 developments will connect into these stubouts. This future developed flow has been accounted for in the design of the culvert system o In lieu of placing the proposed TxDOT headwall on piers, the headwall has a 2' toe down around all sides. In addition to this standard toe down, the toe will be increased by 1' along the entire face and 12' along either side of the wingwall for a total of 3' deep. The headwall will also be placed at the toe of the channel. • C1.03 o The negative junction loss has been eliminated • C2.01 o Phases have been updated to reflect the installation of erosion protection. Phase I includes installing a silt fence and several rock check dams before the box culvert installation begins. Once the headwall is installed, a rock check dam will be added to the outfall. o Note has been added that if mud and dirt begin accumulating on Southwestern Blvd, additional inlet protection will be required at the inlets along the roadway. • C4.01 o Tree survey updated to show trees to be removed In addition, a LOMR-F will be provided to the city once construction is completed. Please feel free to email or call me anytime with any questions about these comments. Thank you. Hunter Starkey. P.E 04-14-2015 29928 Park West Commerce Center Drainage Improvements John Elias Park Operations Manager City of Coppell, Texas RE: Park West Tree Mitigation Mr. Elias, Tree mitigation is required for the drainage improvements for Block 3R, Lot 1 of Park West Commerce Center near the intersection of Freeport Parkway and Southwestern Boulevard. The drainage ditch located in a 30' wide City of Coppell drainage easement will be replaced by a box culvert for discharge into Grapevine Creek. The owner of this property is MLRP Park West Land LLC (hereinafter referred to as "owner"). As directed by the owner, we request that the mitigation plan required as part of the construction of the drainage culvert be combined with the landscape planting plan and requirements of two future buildings located on each side of the easement (future Buildings E and F). Although the drainage culvert will be constructed first, the development of these two buildings would likely begin as soon as 50% of the leasing space on the existing buildings of Park West Commerce Center (Buildings A- D) is met. If development of these 2 buildings has not occurred 6 months after the completion of the drainage culvert construction, the planting plan submitted as part of the drainage culvert design will be reassessed and altered as directed by the City of Coppell. Sincerely, HALFF ASSOCIATES, INC. JH'qunter Starkey, P.E. Civil Engineer HALFF ASSOCIATES, INC. 1201 0�2 - -I 30VVS- R -ROAD __ .,16-6200 %VWV1 HAL -.COP` 21C1I A R F, SON, f X 75081-22;5 AX f21 _39-0095