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rL <br /> w <br /> DRILLINd, WELL CONSTRUCTION AND SAMPLING PROTOCOL <br /> DRILLING <br /> Prior to any drilling or excavation activities, <br /> Underground service Alert (USA) will be contacted to mark all <br /> .� underground utility lines in the vicinity of the proposed <br /> work. All necessary permits will be obtained and 48-hour <br /> notification to the lead agency will be given prior to the <br /> commencement of drilling. <br /> Borings will be drilled using a hollow-stem auger with <br /> no less than 3 1/4-inch diameter (ID) and 6 3/4-inch outside <br /> diameter (OD) . All drilling equipment will be thoroughly <br /> steam-cleaned before drilling begins, to prevent the <br /> -� introduction of contamination from off-site, and between <br /> borings to prevent cross-contamination. <br /> i - <br /> `� All borings will be logged by a qualified geologist <br /> using the Unified soil classification System. The color, <br /> texture, moisture, plasticity (if applicable) , consistency, <br /> pertinent soils or bedrock characteristics, and any evidence <br /> of contamination will be noted on the logs. All water- <br /> bearing zones and the depths at which they were encountered <br /> will be noted on the logs. All logs will be reviewed by a <br /> California State Registered Civil Engineer and verified <br /> "correct." A sample of the material logged is to be <br /> i - <br /> collected and retained for further analysis and verification. <br /> The borings will be drilled in such a manner as to <br /> `tl prevent cross-contamination between strata. Exploratory soil <br /> t : PAGE 1 <br />