Item 21 - On -Call Material Testing and Special Inspection Services

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DIAZ•YOURMAN & ABSOCIAxes -10 G6.4dil"I S drain. DYA's tasks consisted of reviewing existing data and summarizing our engineering analyses, which provided estimates of additional lateral stresses on the storm drain using simplified methods, additional lateral stresses on the storm drain using finite element analyses, and evaluation of various ground improvement schemes to reduce the additional lateral stresses, including deep soil mixing and chemical grout injection. DYA provided recommendations on the improvement of the subgrade in the LRT's right- of-way. Mr. Sandoval provided construction observation during the ground improvement. Measurements during construction confirmed DYA's calculations. LAX Design/Build New Central Utility Plant (CUP) Construction Services, Los Angeles, CA — Project engineer for observation services during construction for shoring; earthwork (excavation and recompaction of existing uncertified fill, and backfill of deepened spread footings for replacement CUP); foundations (deepened spread footings for replacement CUP and cast -in -drilled -hole [CIDH] pile foundations for replacement cooling towers/maintenance building); and utility trenches for conduit connecting replacement CUP to the replacement cooling towers/maintenance building and to the City of Los Angeles Department of Water and Power (LADWP) IS2299 station. Mr. Sandoval provided construction observation during shoring, site preparation, excavation of uncertified fill, placement of fill and backfill, compaction, foundation installation, and prepared reports. Empire Avenue / Buena Vista Grade Separation Horizontal Directional Drill (HDD) Backfill Construction, Burbank, CA — Project engineer for construction observation and testing services for two horizontal directional drills (HDD) to reroute underground utilities on the Empire Avenue / Buena Vista Grade Separation project that was combined with the widening of Interstate 5 by Caltrans. The HDDs were approximately 800 feet long and 40 feet deep and 2,800 feet long and 60 feet deep. DYA had previously performed a field investigation and laboratory testing to provide recommendations for the HDDs. Mr. Sandoval performed the field services. Northridge Fashion Center Yard House and Exterior Plaza, Northridge, CA — Project engineer for observation and testing during earthwork at the Northridge Fashion Center Yard House Exterior Plaza. The improvements to an existing retail shopping mall included improvements to a building space for a restaurant, a vehicle tunnel and ramp with Portland cement concrete (PCC) slab -on grade, ramp retaining walls, backfill of an old basement, landscape areas, light -pole foundations, runoff retention and infiltration system, a grease interceptor tank, and excavation and miscellaneous grading excavations and backfills for plumbing, electrical utility lines, concrete flatwork, landscape, and hardscape (cuts and fills less than 2 feet). The purpose of DYA's services during construction was to check that the soils exposed were consistent with the soil conditions upon which DYA's recommendations were based and to check that the construction operations were performed in a manner consistent with the intent of the plans, specifications, City of Los Angeles grading code, and DYA's Design Report. Mr. Sandoval provided geotechnical observation and testing during construction. Rear Berths 136-139, Terminal Buildings Construction, Port of Los Angeles, CA — Field engineer during construction of the buildings and pedestrian bridge. DYA provided geotechnical investigation services at this site, including a field investigation and recommendations for construction. The Port of Los Angeles (POLA) wanted DYA to be the geotechnical engineer of record and to prepare the compaction and pile driving/installation observation reports for City of Los Angeles Department of Building and Safety (LADB&S) approval. Mr. Sandoval served as the registered deputy inspector to observe the POLA staff perform field density testing; observe the earthwork at building and pedestrian bridge locations; and observe the foundation excavations for shallow and mat foundations for buildings. Mr. Sandoval was also on site for the pile driving/installation.