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v `W_� WORKPLAN FOR ADDITIONAL4OUNDWATER ASSESSMENT and tertiary butanol (TBA) using a modified EPA Method 8260. Analysis of DIPE, ETBE, TAME, and TBA will be limited to the deeper samples because these constituents were not detected in the shallow groundwater during the previous investigation. TPH-g and BTEX was not detected in the soil or groundwater samples collected during previous assessment work in July 20001, therefore, laboratory testing for petroleum constituents using EPA Method 8015/8020 will be considered a "screen analysis" and limited to borings TP-10, TP-14, TP-15 and TP-17. Water samples from borings TP-6, TP-7, TP-8, TP-9, and TP-11 will be analyzed for MTBE using EPA Method 8260. DECONTAMINATION PROCEDURES v Down-hole drilling equipment will arrive to the site clean and will be decontaminated using a high-pressure wash and detergent after each borehole. Soil cuttings will be sampled using disposable, one-use-only, acetate liners for landfill disposal requirements, and will be placed in a sealed storage drum, labeled, and left on-site in a secure location pending receipt of analytical results. Groundwater will be sampled with a dedicated bailer or dedicated Teflon tubing through a slotted, well point to minimize cross-contamination. Down-hole groundwater sampling equipment (well points) will either be dedicated or thoroughly decontaminated using high- pressure wash and detergent between each use. REPORTING Following completion of fieldwork, documentation of the assessment procedures and findings will be presented in a report. This report will be submitted to the SJCEHD for review, and will provide recommendations for additional soil and groundwater assessment if it is warranted, or propose no further action be taken. The final report will include documentation derived from observations of drilling conditions, laboratory results of groundwater analysis, and appropriate drawings locating the boring locations. PROPOSED SCHEDULE OF IMPLEMENTATION This workplan will be submitted to the SJCEHD prior to commencing drilling operations. ESA will arrange a date to commence drilling operations through the University of the Pacific depending on the time required for SJCEHD to review and comment on the Workplan. The SJCEHD will be notified of the date arranged for drilling operations. Samples of soil and groundwater will be remanded to the custody of a California Certified Laboratory within twenty- four(24) hours of acquisition. Turnaround time for the actual analysis will be approximately ten (10) working days. Reporting will require approximately 10 business days to complete and a final report will be submitted to the SJCEHD within 60 days of fieldwork completion. v 1 Subsurface Soil and Groundwater Assessment Report,dated August 25,2000,prepared by ESA. Environmental Science Associates 4 University of the Pacific November 2000 Workplan For Additional Site Assessment 200252 r