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Well and Soil Boring Installation <br /> UST ,ite <br /> 275 Grantline Road <br /> Tracey, California 95476 <br /> DRILLING, SEALING AND SAMPLING PROTOCOL <br /> DRILLING AND SEALING <br /> All boring and well construction procedures will follow guidelines <br /> recommended by the California Regional Water Quality Control Board. <br /> 1. The wells will be installed by a State-licensed (C-57) well <br /> contractor. The proper permit will be obtained and an <br /> inspector may be present to witness the installation of the <br /> wells. The soil borings will be drilled with a continuous <br /> flight, hollow-stem auger of at least S 1/2 inches outer diameter <br /> (OD) . All augers and other down-hole drilling equipment will be <br /> thoroughly steam-cleaned prior to their use on the site. Adequate <br /> clean augers will be available to complete all of the wells without <br /> reusing auger sections. <br /> 2. A geologic drilling (boring) log of the sample locations and <br /> materials encountered will be maintained (see attached Figure 1) . <br /> E: The log will include field descriptions of the soil properties, <br /> lithologic variations using the Unified Soil Classification System <br /> (USCS) , penetration rate of the split-spoon (blows. per 6-inch <br /> interval) , moisture conditions, well construction, and any unusual <br /> characteristics noted that may indicate the presence of hydrocarbon <br /> ! contamination. The logs will be signed by a registered geologist. <br /> i <br /> 3. The boring will be advanced until a water saturated zone is <br /> encountered. At this point, the boring may extend through the <br /> depth of the aquifer into an underlying clay layer or aquitard. If <br /> the saturated zone is more than 20 feet thick, the well will be <br /> completed up to 15 feet below the depth that the saturated zone was <br /> first encountered. <br /> 4. During the drilling operation, all drill cuttings will be <br /> containerized in thick plastic and stored adjacent to the spoils <br /> pile presently on site. Any potentially contaminated waters from <br /> the development of the well wil be containerized in 55-gallon <br /> drums. <br /> 5. Screening that connects 2 relatively permeable lenses, that <br /> appear to be separated by a relatively impermeable layer, shall not <br /> be allowed. The attached Figure 2 describes the well construction. <br /> -A clean, inert, 2-inch OD, Schedule 40 PVC, blankpipe will be-used <br /> as casing in the hole. The well screen will be 2-inch OD, Schedule <br /> 40 PVC pipe usually with 0.01 or 0.02 inch continuous slot <br /> depending on standard design criteria. Sections will be threaded <br />