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Tri Regional Recommendation Page 5 of 24 Appendix A • Completing a Quality Assurance/Quality Quality Assurance/Quality Control plan in- Control plan including chain-of-custody eluding chain-of-custody procedures for procedures for field sampling and analysis field sampling and analysis Specific to the groundwater investigation,the 3 2 Preliminary Investigation and Evaluation Re- workplan is to include the following port (PIER) - X2654, X2723 • A proposal to complete a sensitive receptor The soil and groundwater data collected from im- survey to show water supply wells and sur- plementing the Site Investigation Workplan is to be face water bodies within 2,000 feet of the presented in the PIER and used to create the Site site With field observation and venfication Conceptual Model Information developed for this of any wells within 500 feet of the leaking report will be used to determine what additional underground storage tank site and attempt- work is needed at the site The PIER is to contain ing to obtain depth of annular seal for those wells Summarized background information devel- oped from the Site Investigation Workplan • A rationale for installing monitoring wells and results of the completed sensitive recep- including well location, total depths, screen for survey intervals, and annular seal depth The area of investigation is to be accurately • A construction diagram for any proposed delineated on maps and cross sections to monitoring wells including the well diame- scale to depict the lateral and vertical extent ter, casing and screen type,annular sealing of impacted soil and groundwater identified method and depth to date • The drilling method to be implemented and Cross sections must include stratigraphy decontamination procedures used between based upon boreholes, trenches, monitoring borings wells,or any other supporting information, and must show analytical results and con- The method of well development, and the struction details for all monitoring wells to criteria for selecting the proposed method demonstrate the degree of impact to ground- water and site soils Disposal plans for soil and purge water Tables summarizing analytical data and Plans for completing a location survey of the methodologies used to collect and analyze installed monitoring wells the samples Free product measurement method • Depth to groundwater, and calculated groundwater elevation Water level measurement procedure • Groundwater quality contoured on a site Well purging procedure map for each groundwater unit investigated Sample collection procedures • A graphical and narrative site conceptual model(SCM) showing the extent of known Analytical methods to be used and appropn- soil contamination and groundwater degra- ate detection limits (Analytical laboratories dation relative to the leaking UST system are to report all peaks identified from the and potential receptors The SCM should be soil and groundwater testing, and provide updated as characterization data becomes chromatograms as necessary) available, and used to make determinations for future investigations