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Well and Soil Boring Installation UST Site 275 Grantline Road Tracey, California 95476 DRILLING, SEALING AND SAMPLING PROTOCOL DRILLING AND SEALING All boring and well construction procedures will follow guidelines rernmmended by the California Regional Water Quality Control Board. 1. The wells will be installed by a state-licensed (C-57) well contractor.. The proper permit will be obtained and an inspector may be present to witness the installation of the wells. The soil borings will be drilled with a continuous-flight, hollow-stem auger of at least 8 1/2 inches outer diameter (OD) . All augers and other downhole drilling equipment will be thoroughly steam-cleaned prior to their use on the site. Adequate clean augers will be available to complete all of the wells without reusing auger sections. 2. A geologic drilling (boring) log (see attached Figure 1) will be maintained of the materials encountered and sample locations in the boring. The log will include field descriptions of the soil properties, lithologic variations using the Unified soil Classification System (USCS) , penetration rate of the split-spoon (blows per 6-inch interval), moisture conditions, well construction, and any unusual characteristics noted that may indicate the presence of hydrocarbon contamination. The logs will be signed by a Registered geologist. 3. The boring will be advanced until a saturated water zone is encountered. When the saturated zone is encountered, the boring may extend through the depth of the aquifer to an underlying clay layer or aquitard. If the layer of the saturated zone be more than 20 feet thick, the well will be completed at a depth of up to 15 feet below the depth that the saturated zone was first Encountered. 4. During the drilling operations, all drill cuttings will be containerized in thick plastic and stored adjacent to the spoils pile presently on site. 55-gallon drums will be used to containerize any pote,itially contaminated waters from the development of the well. 5. No screening that connects 2 relatively permeable lenses, which appear to be separated by a relatively impermeable layer, shall be ....allowed...... _.The. attached .Figure-2 describes the well construction. A clean, inert, 2-inch OD, Schedule 40 PVC, blank pipe will be used as casing in the hole. The well screen will be 2-inch OD Schedule 40 PVC pipe with usually 0.01 or 0.02 inch continuous slot 3 depending on standard design criteria. Sections will be threaded and screwed together without the use of cement. The slotted pipe will extend above the estimated seasonal high groundwater level.