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APPENDLY A STANDARD PROCEDURES Quality assurance can be defined as a management program of planned and systematic actions having the objective of providing adequate confidence that our services are performed in accordance with our standards of professional practice and the requirements of our client Brown and-Caldwell's (BC) quality assurance plan assigns quality assurance responsibilities to all staff members BC's quahty assurance plan includes procedures for borehole drilling, soil sampling during drilling, soil vapor extraction (SVE) and air sparging (AS) well installation, field activities, and decontamination Field activities, decontamination, and sampling procedures are in the following sections Borehole Drilling Boreholes will be drilled by a licensed drilling subcontractor using a truck-mounted drilling rig equipped with nominal 8- or 10-inch-diameter hollow-stem augers Boreholes will be drilled to a predetermined depth below the ground surface Borehole depths will be based on site conditions, Including but not limited to, conditions such as depth to water and site geology To prevent cross contamination during drilling, all equipment will be steam-cleaned prior to and between use at each borehole Soil Sampling During Drilling Soil samples will be collected during the drilling operations for three reasons (1) for field identification of the borehole lithology, (2) for qualitative field screening for the presence of contaminants, and (3) possible laboratory analysis For purposes of collecting soil samples for lithologic identification and for field screening, a sample from each borehole will be collected every 5 feet The soil samples will be examined in the field and classified according to the Unified Soil Classification system In addition to evaluating the borehole lithology, the soil samples will be screened in the field with a photoionization detector (PID) or similar instrument, and the relative permeability of the soil will be qualitatively estimated The lithology, PID reading, and estimated permeability of each sample will be recorded on the borehole log next to the depth interval from which the sample was obtained Selected soil samples will be submitted to a California State Certified laboratory for analysis of benzene, ethylbenzene, toluene, and total xylenes, and total petroleum hydrocarbons using the Environmental Protection Agency Methods 503018020, and 8015 Modified Use or disclosure of data contained on this sheet is subject to the restriction specified at the beginning of this document 15WREPORMWORKPLAN