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DRILLING.WELL CONSTR=ON. AND SAMIIING PROTQ!COLS iDrilling Prntocol Prior to any drilling activities, Hydro-Environmental Technologies, Inc (HETI) will verify that necessary drilling perTruts have been secured Prior to drilling, underground and above ground utthties will be located using Underground Service Alert (USA) and site reconnaissance. To the extent possible, drilling will be conducted so that disruptions of normal business actavzties at the project site are minimized. F= shall obtain and review available public data on subsurface geology and, if warranted, the location of wells within a quarter mile of the project site will be identified. Dulling equipment will be inspected for suitability and integrity prior to performing work Subsurface investigations are typically performed to assess the lateral and vertical extent of petroleum hydrocarbons or other contaminants which may be present in soils and groundwater. Drilling methods will be selected to optinuze field data requirements and to be compatible with known or suspected subsurface geologic conditions. Shallow soil bonngs will be drilled dry using a truck-mounted hollow-stern auger drilling ng, unless site conditions favor a different drilling method. Drilling and sampling methods will be consistent with ASTM Method D-1452-80 The auger size will be a minimum of 3-inches nominal outside diameter(O D)for borings not to be completed as wells The auger size will be a muumum of 8-inches nominal O D for borings to be completed as wells No drilling fluids will be used dunng this dnlhng method. All augers and drill rods will initially be thoroughly steam cleaned before arriving on-site, to prevent the introduction of conhuTunants from off-site, and augers and drill rods which are used will be steam cleaned between borings away from . boring locations Working components of the drilling ng (subs, collars and all parts of the ng chassis near the borehole) will also be steam cleaned Cleaned augers, rods and other tools, if required, will be stored and covered when not in use. Decontamination of drilling equipment will consist of steam cleaning, and/or tnsodium phosphate wash. Cleaning operations will be observed and supervised by a representative of HETI The drilling ng will also be inspected by a representative of HETI to ensure that no fluids (hydraulic or lubricant) are leaking from the equipment Soil samples are typically collected at 5-foot intervals, from the ground surface to the total depth of the boring, with a California Modified split-spoon sampler driven 18 to 24 inches ahead of the lead auger by a 140-pound hammer falling a minimum of 30 inches The sampler will be lined with clean brass or stainless steel tubes The number of blows necessary to drive the sampler will be recorded on the boring log and well construction diagram (Plate A-1) to help evaluate the consistency of the materials encountered Additional soil samples may be collected based on significant lithologic changes and/or potential chemical content. All equipment that contacts soil samples will be thoroughly cleaned prior to arrival at the project site and between each individual sample collection point on-site New and used spht-spoon samplers will be stearin cleaned or washed with a trisodium phosphate or Alconox solution, rinsed with tap water, air dried or wiped dry with a clean towel Soil removed from the top two liners (typically each 4 to b inches in length) and the end cone will be used for visual logging purposes and disposed with cuttings produced during the drilling operations The bottom liner, if suitable, will be preserved for laboratory analysis Soil samples from each sampling interval will be lithologically described, consistent with the Unified Soil Classification System, by a HETI geologist The exact depth of all borings to the nearest 1/2- 1