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SITE INVESTIGATION WOR"LAN at the same depths in each boring. Handling and exposure of the core to air will be kept to a minimum to reduce potential for volatilization of aromatic hydrocarbons. A state certified analytical laboratory will analyze the soil samples for MTBE using USEPA Method 8260. GROUNDWATER SAMPLING Groundwater samples will be collected once the borehole reaches the soil/groundwater interface. Groundwater will be allowed to enter the borehole through a screened, temporary sampling point placed by the down-hole direct-push equipment. Groundwater will be extracted using a bottom- fill bailer. Approximately four well-point volumes of water will be purged prior to collecting the groundwater sample. During purging, ESA will measure and record parameters including pH, conductivity, temperature and dissolved oxygen. Purging will continue until the parameters are relatively stable (+ 10%©). After purging, groundwater will be transferred into appropriate glassware, labeled and placed in cool storage prior to transportation to a state-certified analytical laboratory. Prior to arrival to the site, groundwater sample glassware will be laboratory-cleaned and will contain appropriate preservative. A state-certified analytical laboratory will analyze the groundwater samples for MTBE using USEPA Method 8260. DECONTAMINATION PROCEDURES 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 samples will be collected in disposable, one-use-only, acetate liners. Soil cuttings 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 through a slotted, well-point to minimize cross- contamination from impacted soil and high levels of silt and clay. 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 the fieldwork, documentation of the assessment procedures and findings will be presented in a report. That report will be submitted to the SJCEHD for review. The report will provide recommendations for additional soil and groundwater assessment if it is warranted, or no further action. The final report will include documentation derived from the soil boring logs and descriptions, laboratory results of soil and 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. Depending on the time required for SJCEHD review and comment, ESA will arrange, through the University of the Pacific, a date to commence drilling operations. The SJCEHD will be notified of the date arranged for the drilling operations. Environmental Science Associates S University of the Pacific Site lnve,veygution Work Plan june'1000 200252