Environmental Engineering and Remediation
Site Inspections and Investigations

Site Inspection (SI) for Basewide Investigation of Per- and Polyfluoroalkyl Substances (PFAS)

Naval Air Weapons Station (NAWS) China Lake, CA

GCE was subcontracted to conduct the SI to verify the presence or absence of potential PFAS impacts exceeding U.S. Environmental Protection Agency (U.S. EPA), state, or local regulatory-vetted screening levels.

NAWS China Lake is located in the northern Mojave Desert, approximately 150 miles northeast of Los Angeles. NAWS China Lake comprises two major areas, the China Lake Complex and the Ransburg Wash/Mojave B Complex. The 950-square mile China Lake Complex, located in Inyo, San Bernardino, and Kern counties, contains the majority of the range and test facilities, as well as NAWS China Lake headquarters and the China Lake community. The Randsburg Wash/Mojave B Complex, located about 12 miles southeast of the China Lake Complex boundary, contains additional ranges used for air warfare testing and training.

GCE prepared a Work Plan, including the Accident Prevention Plan and Sampling and Analysis Plan, to support the PFAS SI. In addition, GCE prepared Work Plans for Cultural Resources and Natural Resources (CR/NR) surveys, and completed the surveys, and prepared separate CR/NR reports with survey findings.

GCE performed field investigations to determine if PFAS are present at each location, and within which aquifers; general site geological characteristics; general groundwater characteristics, including but not limited to, groundwater flow direction and velocity. Full lateral and vertical extent of groundwater contamination is not required by this initial investigation. Field included the CR/NR surveys, the installation of 45 groundwater monitoring wells, groundwater sampling and analyses of 60 total wells, and soil sampling and analyses. GCE containerized, labeled and disposed of Investigation Derived Waste such as decontamination water, soil cuttings from well installation, purge water from water sampling, etc.