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P. 1 �- FIELD PROTOCOL AMD TECHNIQUES 749 E. Charter Way Stockton, CA E � WELL DRILLING is Driller: Osterberg & Stewart Lie. # 446670 wT Drilling & Logging Supervisor: Mr. Richard Merriam, California Certified Engineering Geologist # 850, Borehole Diameter: 10" Casing Diameter: 4" Drilling Equipment: Hollow Stem Auger with California Split Spoon sampler to be used with 2" dia. r:" long Brass sleeves. Decontamination: All equipment, sampling equipment, and all casing will be decontaminated with steam prior to entering the well. Decontamination will be done between each sample point and the drilling equipment will be decontaminated between each well. r: Borehole Samples: Q °(� One sample each 5 feet of hole starting at 5 feet. Sample tube will be filled completely caped with aluminum foil and a plastic cap, and placed in an ice chest. Samples will be delivered with a chain of custody form to the lab within 48 hours. Sampling will cease at or ;just prior to reaching the water table, Any ! + noted change of lithalogy will require a core sample. Well Completion: The well will be completed using 4" PVC blank and slotted casing. The slotted casing will have 0.02" slots at spacing of 1/8 of and inch. The slotted casing will extend 5 feet above the suspected water table. The remaining casing will be blank to the surface. ' A #3 clean sand pack will be placed opposite the slotted liner f= and extend 3 to 5 feet above the top of the slotted casing. Directly above the sand will be placed a 3 foot bentonite seal. Above the bentonite seal the well anulus will be sealed with neat concrete and a 5% mixture of bentonite. The cement will rise into the traffic box and seal the casing to the sides of the traffic box. If the anulus cement slumps overnight the slumped area will be filled with ready mix grout. The traffic box will be concreted into and raised slightly above the surrounding surface. The casing will be topped with a sealing look cap. i,.:, Well development: Each well will be developed by bailing at least 4 well volumes of water from the well or approximately 35 gallons. Bailer will be decontaminated prior to entry into the well with a non phosphate wash and rinse. Bailed water will be placed in a clean drum. Initial bailing will start by lowering the bailer into the standing water in the well in such a way that the bailer will capture the surface water standing in the well.