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Mr. Taj Bahadori Construction Memorandum #2 14 July 2015 Page 2 Geosyntec O consultants • 60 -mil double sided textured (DST) HDPE GM2 — manufactured by GSE Environmental, Inc.; and • 0.75 -ft thick layer of the proposed GDM. Two (2) 15 -ft wide panels of the GCL (overlapped about 8 in.), overlain by one 23 -ft wide panel of DST HDPE GM, were installed prior to GDM placement. Placement of the GDM was in accordance with the Specifications (i.e., the GDM was piled next to the test pad and pushed over the HDPE GM using a low ground pressure (LGP) D6T dozer). Sixteen (16) passes were made by the dozer while installing the GDM. Once the required thickness of the GDM was placed, the Contractor performed additional 22 passes over the 0.75 -ft thick layer of GDM. Afterwards, the Contractor carefully removed the GDM and Geosyntec personnel visually inspected the HDPE GM for holes, punctures, scratches, etc. The inspection indicated no damage to the HDPE GM. There were no observed holes, punctures, scratches, etc., as a result of the construction loading. Therefore, Geosyntec approves the use of the Cemex 5/16" x 1/8" pea gravel for construction of the Area 2A expansion at the Foothill Sanitary Landfill. During placement of the GDM, equipment loading should be limited to the maximum loading condition applied during this test pad. The CQA Consultant shall monitor GDM placement operations to verify that underlying geosynthetics are not damaged and remain in intimate contact during placement operations. All work performed as part of this construction shall meet the requirements of the project construction drawings and specifications, as modified by relevant construction memoranda. Enclosure — Test Pad Photographs 2 The HDPE GM used for the test pad was from a certified roll for this project (Roll #18772). P\SJC\1780\Task 6.1\CM #2 (GDM Test Pad) �`ffmnmi . i