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12BILLING-WELL CONSTRUMON,AND SAMPLING EROTOCOLS Prior to any drilling activities, Hydro-Environmental Technologies, Inc (HETI) will verify that necessary dnUmg permits have been secured. Prior to drilling, underground and above ground utilities 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 activities at the project site are nurim zed. HETI 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 Drilling 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 optimize field data requirements and to be compatible with known or suspected subsurface geologic conditions Shallow soil borings will be dnlled dry using a truck-mounted hollow-stem 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 minimum of 8-inches norrunal O D for borings to be completed as wells No drilling fluids will be used during this drilling method All augers and dell rods will initially be thoroughly steam cleaned before arriving on-site, to prevent the introduction of contaminants 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 rig 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 trisodium 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 Sampling Protocol Soil samples are typically collected at 5-foot intervals, from the ground surface to the total depth of the bonng, with a Califonua 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 I 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 protect site and between each individual sample collection point on-site New and used split-spoon samplers will be steam cleaned or washed with a trisodium phosphate or Alconox solution, rinsed with tap water, airdried or wiped dry with a clean towel Soil removed from the top ' two'liners (typically each!4 to 6' inches in length) and, the end cone will be used for visual logging purposes and disposed with cuttings produced dunng'the drilling operations , The bottom liner; if suitable, will be preserved for i laboratory analysis Soil samples from'each I sampling interval will be lithologically' described, consistent with the Unified Soil, , Classification System, by a,HETI geologist The exact depth of all borings tolthe nearest 1/2; I III ' I I I I I i I 4 I ISI