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V foot will be determined in the field. Exploratory boring logs shall be prepared under the direction of a Registered Geologist or Professional Engineer. Head-space analysis will be performed in the field to check for the presence of volatile organic compounds. Head-space analysis will be performed using an organic vapor meter(either flame- ionization or photo-ionization). The method used will be consistent with the method described by Fitzgerald (1989). Organic vapor concentrations will be recorded on the HETI Soil Boring Log (Figure 1). The selection of soil samples for chemical analysis are typically based on the following criteria: a. Soil discoloration b. Soil odors C. Visual confirmation of chemical in soil d. Depth with respect to underground tanks e. Depth with respect to groundwater f. Organic vapor meter reading �.. The soil sampler and liners will be cleaned with a trisodium-phosphate or Alconox solution, rinsed with clean tap water and air dried or wiped dry with a clean towel prior to each sampling event. Soil samples (full liners) selected for chemical analyses will be covered with aluminum foil or teflon tape and the ends will be sealed with plastic end caps. The end caps will then be taped to ensure a more secure seal. The samples will then be labeled and entered onto a Chain-of-Custody document,and placed in a cooler on blue ice(hard shell)for transport to a state certified analytical laboratory. Where copper and zinc contamination are the subject of the investigation, stainless steel liners will be used in lieu of brass liners. Stainless steel liners will also be used when the client, additional sampling protocol or regulatory agencies require. V Soil borings will be backfilled (sealed) to the ground surface using either a neat cement or cement-bentonite grout mixture in accordance with appropriate local regulations. V Pending the outcome of the results of the laboratory analyses,excess drill cuttings will remain on-site and, when deemed necessary, covered with a plastic tarp or drummed. Confirmed `, uncontaminated soils may be appropriately disposed of on-site by the client. Soils found to contain concentrations of contaminants above applicable local or state limits will be placed in appropriately labeled 55-gallon D.O.T. drums or in a hazardous materials drop bin and left on- site for proper disposal by the client. At the clients request,HETI will act as the client's agent `~ by assisting in the disposal of the contained material. In no case will HETI personel sign a Hazardous Waste Manifest. Well Construction Monitoring wells shall be installed using a truck-mounted hollow-stem auger drilling rig or an ,r air or mud-rotary drilling rig. Typically, the hollow stem rig will be used for the installation of wells up to 100 feet deep, if subsurface conditions prove favorable. Wells greater than 100 feet in depth will typically be drilled using air or mud-rotary equipment. Mud-rotary equipment will typically be used when alternate methods have failed or proven ineffective. Monitoring well casing and screen shall be constructed of a minimum of Schedule 40,flush joint, threaded, polyvinylchloride (PVC) pipe. The well screen will be factory mill-slotted. The ... screen length shall be determined in the field and shall be placed with the intent of setting the screened interval adjacent to the aquifer material. The screen length shall also be set with the intent of placing the top of the screened interval a minimum of 2 feet above the static water 2