Laserfiche WebLink
ATTACHMENT B <br />moi.:-.NFELDER <br />Before performing work in the field, environmental staff reviews the scope of work, prepares a <br />health and safety plan, coordinates the work to be done with their supervisor, assembles the <br />necessary sample equipment containers, and checks, calibrates and cleans equipment to be used <br />in the field. Underground Service Alert (USA) is also contacted (when appropriate) prior to field <br />work and is apprised of the marked boring locations and the scheduled date of drilling. In <br />addition, a utility locating firm is sometimes employed to check the boring locations. <br />B-2.1 Geoprobe Procedures <br />Geoprobes/soil vapor probes will be driven and sampled by a subcontractor to Kleinfelder. An <br />attempt to penetrate the subsurface at each location will be made. If such penetration is not <br />possible, alternative investigative techniques may be used at an additional cost agreed upon by <br />the client prior to commencement. Samples will be collected in accordance with the proposal. <br />B-2.2 Drilling <br />Soil borings are advanced using a truck -mounted drill rig, equipped with hollow stem augers. <br />Subsurface soil samples are collected from the soil borings. While drilling, an experienced <br />environmental geologist classifies the soil, logs the stratigraphy of the borings, and collects soil <br />samples. <br />B-2.3 Qualitative Field Screening <br />An organic vapor detector, such as a Photovac TIP using a photo -ionization detector (PID) or a <br />Foxboro flame -ionization detector (FID) is used to provide a qualitative screening of each soil <br />sample collected from the borings. The organic vapor detector measures ionizable compounds in <br />the air in parts per million by volume (ppmv). Field calibration is performed using a calibrated <br />span gas such as 100 -ppm isobutylene. Ambient air is used to set the instrument to zero. The <br />soil contained in the cone of the sampler or in a brass tube is exposed and screened with the <br />organic vapor detector. The vapor reading is noted as the field screening result. <br />20-YP1-611/2011P181 Page 13-1 <br />Copyright 2001, Kleinfelder, Inc. July 3, 2001 <br />