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RBF Consulting A2013-59 - A2 /37.379 RECEIVED APR 2 1 2014 c - 6 ,z&' RBF CONSULTING 14000 City Center Drive Chino Hills, CA 91709 April 15, 2014 (909) 364-2600 waw. `� ,// . John McCarthy, P.E. RBF Consulting 14725 Alton Parkway Irvine, CA 92618 Dear Mr. McCarthy RE: Amendment No. 2 to Agreement No. A13-59 The City of Chino Hills authorized execution of Amendment No. 2 to Agreement No. A13-59 in the amount of $3,550 increasing the not-to-exceed amount to $80,450, for the development of plans, specifications, bid documents, and limited construction management assistance for the Hickory Creek Mitigation Project. Enclosed for your records is an executed copy of Amendment No. 2. Should you have any questions on this matter, you may contact Public Works Director Nadeem Majaj at (909) 364-2800. Very truly yours, CITY OF CHINO HILLS 7/3. 64 MARY M. M.IUFFEE, CMC CITY C ERK Enclosure cc: Judy Lancaster, Finance Director Nadeem Majaj, Public Works Director Tad Garrety, Environmental Services Coordinator CCazi Art Bennett • Ed M. Graham • Ray Marquez • Cynthia Moran • Peter J. Rogers CITY OF CHINO HILLS AMENDMENT NO. 2 TO AGREEMENT NO. A13-59 BETWEEN THE CITY OF CHINO HILLS AND RBF CONSULTING THIS AMENDMENT No. 2 to Agreement No. A13-59, dated April 3, 2014, is entered into in the State of California by and between the City of Chino Hills, a California general law municipal corporation, hereinafter called "City", and RBF Consulting hereinafter called "Consultant". Amend Agreement A13-59 as follows: 1. Amend Exhibit A by adding the attached Design Plan Modifications 2. Amend Exhibit B by increasing the not-to-exceed amount by $3,550 for Design Plan Modifications. Total amended contract amount is $80,450. All other provisions of the agreement remain in effect. IN WITNESS WHEREOF, the City Council of the City of Chino Hills has caused this Amendment No. 2 to Agreement No. A13-59 to be subscribed by its duly authorized officers, in its behalf, and the said party of the second part has signed this Agreement. RBF CONSU IN CITY OF CHINO HILLS 7 J N MC/tARTHY P.E1 KZSNRADT BARTLAM, CITY MANAGER VE PRESIDENT Hickory Creek Mitigation Project Agreement A13-59 Additional Work Request #2 3/24/14 Task 1.0 Design Nan Modifications RBF will modify the latest improvement plans and basis of design report to incorporate the City's request to minimize the proposed riparian vegetated footprint from 2.0 acres to 1.43 acres. Planned modifications will include the reduction of cut in the downstream portions of the project from approximate channel stations 12+50 to 20+50. Modifications to these sections will require additional efforts in grading analysis and plans, hydraulic calculations, planting plans, and irrigation plans. This option will eliminate approximately 2,500+cy of excess cut. Grading $1,500 New grading will be established in unison with the hydraulic modeling. Both tasks will be evaluated at the same time until the appropriate terraces are inundated for the given design flows. Focus will be given to maximize the 1-year terrace where possible. This subtask has been budgeted for 16 hours. Hydraulic Calculations $550 HEC-RAS scenarios will be modeled to establish (where possible) the 1-year, 2-year, and 5-year terraces for the downstream portion of the project. The final model will match the final grading plan for the channel and low flow terraces.This subtask has been budgeted for 4 hours. Planting Plan $350 Based on the established new grading plan, the planting plan will be prepared in conformance with the City's request. This subtask has been budgeted for 3 hours. Irrigation Plans $800 The irrigation plans will be modified to service the new graded areas. Irrigation systems identified in the previous plan submittal will be used in this submittal. This subtask has been budgeted for 5 hours. Protect Management $350 Coordination and communication of the new plan set will be completed during the development of these plans. The expected budget for this subtask is 2 hours. TOTAL $3,550