2400 33RD ST CONTRACT AGREEMENT 2016-01-01 MF Import

ATTACHMENT A TO SECTION 01900 REVISIONS TO THE S7ANDARD PLANS AND SPECIFICATIONS Unsuitable soils as de',r.ed in the tollowing supplement to Section 2-03.1 of ihe Standard Specifications excavated from the site shall be placed in stockpiles, on plastic, for testing as described below. Stockpiles shall be placed in locations and tested in such a manner as to not inhibit the Coniractor irom continuing the work on schedule. Contaminated waste material shall be disposed of at a Subtitle D landfill. Characterization ot the waste was performed during previous studies; no additional testing is required tor disposal at a Subtitle D landfill. If the Contractor disposes at other than a Subtitle D landfill, ihe Contractor shall be responsibte for choosing the disposal facility and periorming tests to meet the requirements ot the chosen facility. Mir�mum frequency of testing shall be as follows: The Coniractor shall assume ihe railroad ties are creosote treated and shall be disposed of per State regulations. The Coritractor shall submit a disposal plan to the Resi�ent Fnc�ineer that describes the stockpile location, storage, testing, �isposal, and worker safety methodology. ROADWAY AND SITE EXCAVATION AND EMBANKMENT Description Section 2-03.1 is supplemented with ihe following: The Contractor should be aware that both heavy metal and peiroleum hydrocarbon cor�tamination may be present in the site's soils. The heavy metal (Arsenic) is present in the granular surfacing material, which shall be saved and used on site as subgrade material. Arsenic may also be present in ihe underlying soils. Total Petroleum Hydrocarbons (TPH), gasoline to diesel range, is likely to be present in ihe soils below the crushed rock sur(ace. The presence of TPH is normally detectable by smell. The petroleum hyd!ocarbons appear to be more predominant in the norlh2astern portion oi the project along ihe bridge but they may be encountered throughout the site. The excavated/disturbed petrolaum hydrocarbon contaminated waste soils shall be disposed of oilsite at an approved disposal site in accordance with Standard Specitication Section 2-03.3(7)C and as amended herein, and may not be reused on site. See Coniract Speci(ications Division 1 Sections 01575, 0157f,, and 01577 for health & satety requirements (or worker protection and handling and disposal requirements. It is expected that all deep excavations tor trenches for storm water and water lines, toundations, iree pits, and electrical conduit below the existing granular surf;nce material will likely be unsuitable and be removed as part of an unsuitable foundation excavation item. Consiruction Requiremenis Seciion 2-03.3 is supplemented with lhe (ollowing: Street Improvement The roadway ot the approach on 33rd Street shall be excsvated to a minimum dept!� of 18 inches �, below ihe new pavement sections and replaced with compacted structural fill. This inclt,des ?' removing all existing asphalt concrete, curb and c�utter, and sidewalk in areas of new con;truction. ' Capital Projects Commuter Rail Attachment A to Section 01900 - 8 IFB No. RTA/CF 21-06 � Everett Station Phase 2REVISIONS TO THE STANDARD PLANS AND SPECIFICATIONSAddendum No.4