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SCOPE OF WORK <br /> The proposed scope of work for preliminary site investigation and groundwater assessment <br /> will include the following tasks: <br /> Task 1: C'nnrdiirt Pra-Fiala ArtivitiPs <br /> On receipt of approval of the work plan by the regulatory agencies,permits will be <br /> obtained from the SJCPHS to perform the drilling and sampling activities; <br /> Underground Service Alert and an independent utility locator will be contracted to <br /> survey and identify underground utilities;and appropriate agencies notified prior to <br /> field activities. <br /> Task 2: C'nllart Snil anrd Shallnw C;rrnrndwatar Samnlac <br /> Soil and shallow groundwater samples will be collected from up to 10 temporary <br /> borings, as shown on the attached site plan to assess the horizontal extent of <br /> petroleum hydrocarbons in the subsurface. A hand auger and soil sampler or a direct <br /> push drill will be used to drill to the desired depths and collect soil samples <br /> immediately above the encountered groundwater for chemical analysis. <br /> Soil samples from each boring will be collected using a sampler equipped with stainless <br /> steel tubes. The sampler will be advanced approximately six inches into the <br /> undisturbed soil using a slide hammer. After retrieval from the boring,the sampler will <br /> be opened,and the sample tube removed. Each sample will also be field screened <br /> using a photoionization detector or combustible gas indicator to assist in selecting <br /> samples for laboratory analysis. The samples selected for analysis will be retained <br /> within the tube and both ends will be immediately covered with Teflon sheeting and <br /> polyurethane caps. The caps will be sealed with adhesive tape and labeled with the <br /> following information: Alisto's project number,boring number,sample-depth interval, <br /> sampler's initials, and date of collection. The sample will be immediately placed in a <br /> waterproof plastic bag and stored in a cooler containing water or blue ice maintained <br /> at 4°C. Possession of the samples will be documented from the field to a state-certified <br /> analytical laboratory by using a chain of custody form. <br /> After obtaining the soil samples, the borings will be extended to a depth of <br /> approximately three feet into the groundwater. A temporary 3/-inch-diameter,flush- <br /> threaded,Schedule 40 PVC casing,with perforated casing extending from the bottom <br /> of the boring to above the stabilized groundwater level will then be inserted into each <br /> boring to collect a grab water sample for laboratory analysis. It is anticipated that <br /> groundwater will be encountered at approximately 7 to 10 feet below grade. Prior to <br /> collecting groundwater samples from the borings, groundwater will be purged from the <br /> temporary casing while periodically collecting field parameter readings. Purging will <br /> continue until these readings have stabilized,indicating that the groundwater is <br /> representative of the aquifer. After sample collection, the borings will be backfilled <br /> with neat cement and the surface repaired to match surrounding conditions. <br /> Before each use and to avoid cross-contamination, all drilling and sampling equipment, <br /> including temporary casing,will be decontaminated using a phosphate-free detergent <br /> followed by a tap water and deionized water rinses. <br /> 2 + � u ' U <br />