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SITE INVESTIGATION WORKPLAN <br /> at the same depths in each boring.. Handling and exposure of the core to air will be kept to a <br /> minimum to reduce potential for volatilization of aromatic hydrocarbons. A state certified <br /> analytical laboratory will analyze the soil samples for MTBE using USEPA Method 8260. <br /> GROUNDWATER SAMPLING <br /> Groundwater samples will be collected once the borehole reaches the soil/groundwater interface. <br /> Groundwater will be allowed to enter the borehole through a screened, temporary sampling point <br /> placed by the down-hole direct-push equipment. Groundwater will be extracted using a bottom- <br /> .fill bailer. Approximately four well-point volumes of water will be purged prior to collecting the <br /> groundwater sample. During purging, ESA will measure and record parameters including pH, <br /> conductivity, temperature and dissolved oxygen. Purging will continue until the parameters are <br /> relatively stable (± 10%). After purging, groundwater will be transferred into appropriate <br /> glassware, labeled and placed in cool storage prior to transportation to a state-certified analytical <br /> laboratory. Prior to arrival to the site, groundwater sample glassware will be laboratory-cleaned <br /> r and will contain appropriate preservative. A state-certified analytical laboratory will analyze the <br /> {W groundwater samples for MTBE using USEPA Method 8260. <br /> DECONTAMINATION PROCEDURES <br /> Down-hole drilling equipment will arrive to the site clean and will be decontaminated using a <br /> r high-pressure wash and detergent after each borehole. Soil samples will be collected in <br /> Ldisposable, one-use-only, acetate liners. Soil cuttings will be placed in a sealed storage drum, <br /> labeled, and left on-site in a secure location pending receipt of analytical results. Groundwater <br /> will be sampled with a dedicated bailer through a slotted, well-point to minimize cross- <br /> contamination from impacted soil and high levels of silt and clay. Down-hole groundwater <br /> sampling equipment (well points) will either be dedicated or thoroughly decontaminated using <br /> t high-pressure wash and detergent between each use. <br /> 1.1 REPORTING <br /> �i Following completion of the fieldwork, documentation of the assessment procedures and findings <br /> will be presented in a report. That report will be submitted to the SJCEHD for review. The <br /> report will provide recommendations for additional soil and groundwater assessment if it is <br /> warranted, or no further action. The final report will include documentation derived from the soil <br /> boring logs and descriptions, laboratory results of soil and groundwater analysis, and appropriate <br /> drawings locating the boring locations. <br /> PROPOSED SCHEDULE OF IMPLEMENTATION <br /> This workplan will be submitted to the SJCEHD prior to commencing drilling operations. <br /> r Depending on the time required for SJCEHD review and comment,ESA will arrange, through the <br /> LUniversity of the Pacific, a date to commence drilling operations. The SJCEHD will be notified <br /> of the date arranged for the drilling operations. <br /> Environmental Science Associates 5 University ofthe Pacific Site Investigation Work Plan <br /> June 2000 200252 <br />