Senior Chemist: Federal Data Validation Lead

Halff; San Antonio (TX); On-site; USD 110,000 - 160,000; Full time

Benefits offered by this job

Medical insurance

401(k) plans

ESOP

Paid holidays

PTO

Job summary

Halff in San Antonio is seeking a Chemist or Senior Chemist to lead our environmental data quality efforts, focusing on data validation, QA/QC, and regulatory compliance for federal programs. You will act as the technical authority on chemical data for DoD projects and deliver defensible datasets.

The role spans from program planning to final DVR and DUSR packages, with mentorship for junior analysts and potential ownership in the firm.

Qualifications

• Bachelor’s degree (BS/BA) in Chemistry, Environmental Science, or related field.
• Minimum of 5 years of experience in environmental chemistry, lab testing, and/or data validation.
• For Senior Chemist, at least 12 years of experience with leadership on complex federal remediation projects.
• Proven history of authoring UFP-QAPPs and executing Stage 2A/2B and Stage 4 validation.
• Strong DoD QSM standards, EPA SW-846 methods, and Emerging Contaminants expertise.
• Laboratory bench experience with GC/MS and ICP-MS preferred.
• Familiarity with EQuIS and EQuIS DQM.
• Strong technical writing; ability to simplify complex data for federal clients.
• Willingness to obtain certifications and training.
• Must pass pre-employment substance abuse test and company physical.

Responsibilities

• Review Level II and Level IV data validation packages on diverse environmental matrices using EPA NFG and federal criteria.
• Draft, revise, and implement QAPPs using the UFP-QAPP framework.
• Enforce strict compliance with DoD QSM requirements for laboratories and internal projects.
• Support and provide QA/QC for Stage 2A/2B and Stage 4 data validation.
• Evaluate, troubleshoot, and apply data qualifiers to EDDs with ERPIMS and regional databases.
• Coordinate with commercial laboratories to resolve discrepancies and set reporting limits.
• Prepare DVRs, DUSRs, and technical memoranda defending data usability decisions.
• Senior mentorship: provide cross-review of data packages and lead chemistry scope.

Skills

Environmental chemistry

QA/QC

Data validation

DoD QSM standards

GC/MS

ICP-MS

Technical writing

Leadership

Education

BS/BA in Chemistry or Environmental Science

Tools

EQuIS

ERPIMS

Job description

Halff in San Antonio is seeking a Chemist or Senior Chemist to lead our environmental data quality efforts, focusing on data validation, QA/QC, and regulatory compliance for federal programs. You will act as the technical authority on chemical data for DoD projects and deliver defensible datasets.

The role spans from program planning to final DVR and DUSR packages, with mentorship for junior analysts and potential ownership in the firm.