Daniel Sierra Email and Phone Number

o Led successful “leak-free & injury-free” start-up of greenfield 100kta ASA polymer plant, including Tank Farm & Utilities process areas. Led PSSRs of 141 “subsystems” and supported commissioning efforts to ensure operational safety and readiness of equipment leading.o Continuing to provide day-to-day process/production support for three individual process units (SAN, Rubber, & Compounding). Supervising two Operations Specialists in the development/refinement of SOPs and driving process improvements & optimization efforts.o Production Coordinator interfacing with corporate Business & Planning teams to determine production schedule for three process units. o Developed Production Management documentation including final product formulations, mixer batch & extruder recipes, and product transition plan & cleaning strategies.o Developed SAP Master Data for all intermediate and finished products, including BOMs, Recipes, & Production Versions as well as Production Confirmation documentation and trained Operations on SAP transactions.o Responsible for OEE metrics reporting - developing Production KPIs and downtime tracking system.o Championed Process Safety culture and spread awareness throughout site via Process Safety Beacons and presenting various topics during monthly safety meetings. Active member of site Safety Council.o Trained site personnel on processes for managing MOCs, incident investigations, and action items. Trained site on workflow tracking system (KMS) and managed system as an administrator. o Performed “clean-up” of Project PHA in preparation of initial 5-year revalidations. Supported closeout of remaining project PHA recommendations.o Led Root Cause Analysis (RCA) using Cause Mapping methodology for various process safety & environmental-related incidents.

o Participated in piping and equipment 3D-model reviews and process unit & vendor-package HAZOPs.o Reviewed vendor-package engineering documentation and provided feedback to vendors. Participated in Factory Acceptance Tests (FAT) for various packages.o Reviewed datasheets and provided feedback to EPC contractor for various equipment, including rotating equipment, “specialty-item” equipment, and instrumentation. Reviewed all instrument Alarm & Trip settings and provided feedback to EPC contractor & DCS integrator.o Performed audits on various equipment drawings, piping isometric drawings, and process/vendor-package interfaces to identify discrepancies, preventing costly construction change orders.o Provided construction engineering support for equipment turnover, management of scope/design changes, and MOCs for tie-ins occurring within neighboring plant.o Developed safe operating envelopes for all processes and equipment. Supported development of process manuals, operator training program, and SOPs.

o Provided day-to-day process/production support of two Polystyrene production units with responsibilities including rate adjustments & product transitions, production schedule coordination, startup/ shutdown planning & support, and process troubleshooting & improvements.o Trained site personnel on new process for managing MOCs, incident investigations, and action items. Transitioned site from legacy “paper” process to digital workflow system (KMS) and managed system as site administrator. o Prepared, coordinated, and facilitated HAZOP studies for 5-Year PHA revalidations and submitted final reports to site management for review. Improved site PHA procedure to conform to corporate standards.

o General process engineering support for plant shutdown, turnaround, and startup. Oversaw implementation of major capital projects for repacking styrene distillation columns. Performed process engineering equipment inspections and closure sign-offs.

o Validated relief valve sizing cases to ensure equipment met minimum code requirements, specifically for equipment where fire case is the controlling case.o Audited all furnace and fired equipment to determine if systems met minimum code requirements, including interlocks, overall equipment design, and supporting documentation availability.o Evaluated catalyst batch system where circulation pump exhibited poor reliability requiring frequent costly maintenance. Performed hydraulic calculations (pipe pressure losses using pump curves) on system to determine extent of fouling and identified corrective measures (e.g. piping modifications) to extend pump life.

o Updated various procedures and performed operator trainings.o Upgraded/replaced various process equipment.o Commissioned the startup of a sample panel and trained operators on taking sampleso Redesigned a vent system. o Evaluated performance of various heat exchangers and added LMTD equations on DCS o Updated unit SOC's and alarm setpoints.

o Updated amine rich loading inferentials, creating tools to better understand unit rich loadingo Determined amount of amine discarded during treatment and devised solutions to recapture.o Created a tool to monitor sour water and NESHAP water generated in refinery. o Inspected various equipment during TAR.

o Updated potable water program for water sampling as required by TCEQ regulations, o Created a site-wide map for all Satellite Accumulation Areas to improve documentation and reporting. o Updated inventory of all confined spaces in plant to satisfy regulatory requirements.