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Biagini Properties, Inc. D06105.01 <br /> April 11, 2000 Page 3 <br /> removed the dry cleaning equipment and has operated the facility as a"pick-up /drop-off' <br /> facilit\. Storage, use, and disposal of dry cleaning solvents during approximately 1989 to 1994 <br /> may present a potential environmental concern at the site. Drawing 2 is a site plan showing the <br /> existing dry cleaner location. <br /> 4.0 INVESTIGATIVE PROCEDURES <br /> This passive soil vapor survey will consist of obtaining the required permits, installing and <br /> retrieving passive soil vapor screening modules, a laboratory testing program, and preparation of <br /> a technical report. The activities summarized below are intended to be consistent with the <br /> requirements of the SJCEHD. General standard operating procedures (SOPs), relevant to the <br /> field and laboratory activities discussed herein, are described in Appendix A. Specific details <br /> and any deviations from the SOPS are summarized in the following sub-sections. The site safety <br /> plan prepared by Twining for this scope of work is included in Appendix B. <br /> 4.1 Field Investigation: The field investigation will consist of installing and retrieving the <br /> passive soil vapor screening modules. <br /> 4.1.1 Screening Module Installation: A Twining Environmental Technician will install <br /> approximately 12 passive soil vapor screening modules at selected locations in the study area. <br /> The technician will install the screening modules by driving a 5/8-inch steel tile-probe using a <br /> slide hammer to a depth of 3 feet. The tile-probe will be removed from the boring and the <br /> screening module will be placed at the bottom of the boring using the insertion rod supplied by <br /> Gore. The screening module will be attached to a cork which will be inserted into the top of the <br /> boring and hammered into the opening at least one inch. The remaining opening above the cork <br /> will be filled with a neat cement mixture to protect the cork and the screening module from <br /> traffic or tampering. The passive soil vapor screening modules will remain in place for a <br /> minimum of two weeks. The exact location and identification number of each screening module <br /> will be recorded at the time of installation. The proposed locations for the passive soil vapor <br /> screening modules are illustrated in Drawing 2. <br /> One trip blank will be used to assess sample handling procedures. The trip blank will <br /> accompany the samples to and from the field but the container will not be opened. <br /> 4.1.2 Screening Module Retrieval: After the minimum two week residence time has passed, <br /> Twining will return to the site and retrieve each of the screening modules. Retrieval will take <br /> place by cracking and removing the neat cement cover over the cork and removing the cork from <br /> the boring. Upon retrieval, the identification number of each screening module will be <br /> confirmed with the installation records prior to placing the module into a glass jar with a sealable <br /> lid and capped for transportation to the laboratory. <br /> 4.2 Laboratory Testing Program: Soil vapor samples collected from the area of the former <br /> dry cleaner facility will be tested in the laboratory for chlorinated volatile organic constituents <br />