Laserfiche WebLink
Geosyntec' <br /> consultants <br /> 5.2 Task Descriptions <br /> Task 1: Drive to/from Site <br /> A Geosyntec employee will be required to drive to and from Stockton to supervise and <br /> conduct field activities. The employee shall obey all traffic laws, practice defensive <br /> driving, adhere to HS-105, and use Smith System safe driving practices. <br /> Task 2: Soil Vapor Probe Installation and Sampling <br /> Temporary soil vapor probes will be installed around SG-100 to delineate PCE <br /> impacts. Probe installation will not commence until locations have been cleared by a <br /> private utility subcontractor and Underground Services Alert 811. <br /> Once the probe locations have been cleared, Geosyntec will oversee Penecore Drilling, <br /> Inc. (Penecore) as they advance up to 10 borings using a direct-push technology drill <br /> rig. Geosyntec personnel will log all soil core collected from the borings in order to <br /> select soil vapor probe depths. Once depths have been selected, Geosyntec personnel <br /> will oversee Penecore as they install temporary soil vapor probes at up to two depths <br /> per location (between 5 and 20 feet bgs). <br /> Samples will be collected from each soil vapor probe no less than two hours after <br /> installation for screening using a HAPSITE mobile laboratory. HAPSITE results will <br /> be used to select step-out locations for additional borings and temporary vapor probes <br /> in up to 10 borings. Samples for laboratory analysis will be collected from the furthest <br /> step out probes for analysis by EPA TO-15. Soil vapor probe purging and sampling <br /> activities will be conducted in accordance with the soil vapor sampling SOP in <br /> Appendix B of the Soil Vapor Assessment Work Plan. An estimated 14 soil vapor <br /> samples with two duplicates are expected to be submitted to the laboratory. <br /> Task Hazard Analyses (THAs) associated with these tasks are presented in Appendix B. <br /> 5.3 Chemical Hazards <br /> The classes of chemicals that are known or suspected to be present that may be encountered while <br /> performing site work include the following: <br /> • Chlorinated volatile organic compounds (VOCs) <br /> • Oxidizers (potassium permanganate) <br /> Controls for these hazards are presented in the THAs included in Appendix B.A summary of these <br /> chemical hazards is presented in Appendix C. <br /> SAC I I 1 i HASP—Revision—October 2020 8 10/22/20 <br />