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Compliance & Closure, Inc Groundwater Sampling Protocol Latest Revision October 1999 o Trip Blanks: Used for purgeable organic compounds only, QC samples are collected in 40 milliliter (ml) sample vials filled in the analytical laboratory with orgamc-free water Trip blanks are sent to the project site, and travel with project site samples Trip blanks are not opened, and are returned from a project site with the project site samples for analysis o Field Blank: Prepared in the field using organic-free water These QC samples accompany project site samples to the laboratory and are analyzed for specific chemical parameters unique to the project site where they were prepared o Duplicates: Duplicated samples are collected "second samples" from a selected well and project site They are collected as either split samples or second-run samples collected from the same well o Equipment Blank: Periodic QC samples collected from field equipment rinseate to verify decontamination procedures The number and types of QC samples are determined and analyzed on a project-specific basis Shallow Groundwater Survey A shallow groundwater survey employs reconnaissance field sampling and chemical analysis for rapid plume mapping Occasionally, a state-certified laboratory subcontractor may be used The subcontractor would sample for analysis at locations marked by the CCI field geologist The than-diameter probes from which groundwater is collected are advanced to the water bearing stratum, sample is withdrawn to the surface, and analyzed immediately thereafter Probe holes are backfilled with a grout slurry or as the local permitting agency requires The shallow survey contractor will supply sampling, purging, and field chemical analysis to CCI in their report CCI considers this type of shallow probe mapping (together with shallow groundwater sampling) to be a reconnaissance technique only •