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Ll <br />L] <br />C e" <br />•1 � f <br />1000 1 W04 o•. <br />Area 2A Expansion <br />Foothill 1Landfill <br />Taj Bahadori, P.E. (San Joaquin County) <br />Krzysztof Jesionek, P.E. (Geosyntec Consultants, Inc.) <br />10 August 2015 <br />Awni Taha, P.E. (San Joaquin County) <br />Michael Raub (Advanced Earth Sciences, Inc.) <br />Operations Layer Material Specification Modification <br />Part 2.06 of Section 02300 of the Construction Specifications' for the Area 2A Expansion at the <br />Foothill Sanitary Landfill in San Joaquin County, California, requires that: <br />"A. Operations Layer shall be generally sandy material obtained from on-site excavations <br />and shall be selectively stockpiled. <br />B. Operations Layer shall be free of organic or other deleterious material. <br />C. Operations Layer shall have a maximum particle size of 3/8 inch where in contact with <br />the geomembrane and in the top foot above the geomembrane. Above the top foot above <br />the geomembrane, material shall have a maximum size of 3 inches." <br />During the excavation of the Area 2A expansion project, the Contractor selectively stockpiled <br />and screened the sandy materials encountered through a 1 -inch screen. The operations layer <br />material is generally free of organic and other deleterious material. However, the stockpiled <br />materials also contain clods with sizes greater than 3/8 inch. Based on field observations, most <br />of the clods would be broken down by equipment during handling and placement of the <br />operations layer. Therefore, Geosyntec modifies Part 2.06.0 of Section 02300 of the <br />Construction Specifications to read: <br />"C. Operations Layer shall have a maximum particle size of 1 inch." <br />All work performed as part of this construction shall meet the requirements of the project <br />construction drawings and specifications, as modified by relevant construction memoranda. <br />' San Joaquin County, "Specifications (Including Special Provisions, Notice to Bidders, Bid and Contract) for the <br />Construction of Area 2A at the Foothill Sanitary Landfill, " Department of Public Works, 10 December 2014. <br />P\SJC\l780\Task 6\CM\CM#4 (Ops Layer) engineers I scientists I innovators <br />