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07 May 2002 AGE-NC Project No. 98-0466 Page 11 of 16 • Two soil borings in the western ditch down-stream(west) of previous soil borings (PB5 and PB6) for collection of soil and`grab' ground water samples to del eate the extent of metals- impacted ground water in the area; and • Three shallow probe borings will be advanced to approximately 20 feet bsg within the former teepee incinerator pit for collection of soil samples to assess for metals-, TPH- and VOC- impacted soil for waste classification. Procedures for the advancement of probe borings are described below in Section 5.2. Select soil samples will be analyzed by a State of California Department of Health Services (DHS)-certified laboratory as described in Section 8.0.Laboratory reports for groundwatcanalyses,testing methods, laboratory quality assurance/quality control (QA/QC) reports, and 3ample chain of custody documentation will be presented in a report with the findings and recomnendations. 4.3. HEALTH RISK ASSESSMENT AGE will retain MECA Consulting Inc. of Pleasant Hill, California to prepare a Health Risk Assessment (HRA) based on the findings of this and previous investigations performed at the site. The HRA will be utilized to determine potential human health risks posed by impacted soil at the site. The HRA will be prepared as directed by the RWQCB and shall follow the general guidance presented in the United States Environmental Protection Agency's Ris Assessment Guidance for Superfund, Part A: Human Health Evaluation Manual. 5.0. FIELD INVESTIGATION To further assess the areas of potential concern,AGE proposes to advanc e eight probe borings at the various areas of concern. Selected soil and/or `grab' ground water samples will be collected and analyzed for chemicals of concern specific to each location. A report o findings will be submitted to the RWQCB following completion of the field investigation. 5.1. PREPARATIONS FOR FIELDWORK Prior to conducting field work, the following tasks will be completed: • Obtain permits from the EHD for the soil borings. • Mark boring locations a minimum of 48 hours prior to field wo Advanced GeoEnvironmentai,Inc.