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MEMORANDUM <br />To: <br />From: <br />Subject: <br />David Cavazos <br />City Manager <br />William Galvez, Interim Executive Director <br />Public Works Agency <br />Date: March 25, 2014 <br />Project No. 13 -7511: RESIDENTIAL STREET REPAIR — PHASE 17 <br />CHANGE ORDER NO. 1 <br />CONTRACTOR: Superior Paving Company, Inc. <br />14660 Industry Circle <br />La Mirada, CA 90638 <br />PROJECT DESCRIPTION: 13 -7511: Residential Street Repair — Phase 17 <br />CHANGE ORDER NUMBER: 1 CHANGE ORDER TOTAL: $ 41,620 <br />ACCOUNTING UNIT - ACCOUNT - ACTIVITY NUMBER: 13518783-66220-13751101028 <br />JUSTIFICATION <br />a <br />c-aa <br />1. On 6th Street from Bristol Street to Shelton, 5th Street from Bristol to Baker, and <br />Baker Street from Santa Ana Boulevard to Civic Center Drive the contract <br />documents call to remove the existing concrete (PCC) pavement, backfill with 6" <br />of crushed miscellaneous base, cement treat a 9" section, and pave 6" of AC. <br />However, after potholing the existing utilities, several water and gas service were <br />found very shallow and therefore were in conflict with the proposed section. <br />Therefore due to a significant time required to relocate these utilities, it was <br />recommended to revise the street section. <br />While removing the PCC pavement, the contractor encountered areas where the <br />street sections were thicker than expected as well as a wet and unstable sub - <br />grade. To ensure the integrity of the new pavement with the revised section, it <br />required additional excavation, which is greater than the amount specified in <br />the contract, and strengthening the sub -grade with additional base <br />material. Since the additional work was not included in the original contract <br />amount, staff requested a revised unit cost for quantities in excess of 125 %, in <br />order to pay for the work. This change order provided compensation at a reduced <br />cost for the additional unclassified excavation and base material required to treat <br />the subgrade failures and construct the modified street section. <br />Estimated Cost = $34,496 <br />2. At Poinsettia Street from Civic Center Plaza to Santa Ana Boulevard, the contract <br />documents call for a cement treated base (CTB) section. Subsequent to <br />removing the street, staff discovered that the majority of existing AC is structurally <br />sound and can be used in lieu of the CTB, as required by the contract. Therefore, <br />