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envirOS© <br /> Proposed Work Tasks <br /> Based on previous data, three additional areas of ground water investigation are proposed. The <br /> locations are presented on Plate 4. The purpose of this investigation will be to delineate the extent <br /> of petroleum hydrocarbons in ground water in the down-gradient and up-gradient directions from <br /> the former USTs and product piping areas. <br /> Specific work tasks are described below. <br /> TASK 1 -Applications &Fees <br /> Drilling applications will be completed and appropriate fees will be paid upon approval of the work <br /> plan. <br /> TASK 2 -Utility Clearances <br /> Underground utility clearances will be cleared at each proposed drilling location. <br /> TASK 3 -Right-of-Entry Agreements/Encroachment Permits <br /> Appropriate right-of-entry agreements and encroachment permits will be secured for adjacent <br /> properties where investigation is proposed. <br /> TASK 4—Health & Safety Plan <br /> A site-specific Health and Safety Plan will be completed for tasks described in this work plan. <br /> Task 4 Site Investigation <br /> Three exploratory soil borings are proposed in the areas shown on Plate 2. Exploratory borings <br /> will be drilled using Geoprobe drilling techniques. These borings will be drilled to first <br /> encountered ground water which is estimated to be approximately 45 to 50 feet below grade (fbg). <br /> An Enviros geologist will supervise the drilling and describe encountered soils using the Unified <br /> Soil Classification System(USCS). Soil samples will be collected at five foot intervals and/or <br /> significant lithologic changes for lithologic description. Soil sample intervals will be screened in <br /> the field for organic vapor by measuring head-space vapors using an organic vapor meter(OVM). <br /> Ground water samples will be collected from each boring, labeled, entered onto a chain-of- <br /> custody record, and preserved in a cooler with ice for transport to a State of California certified <br /> laboratory. <br /> An exploratory boring log will be prepared for each boring. Head-space vapor measurements will <br /> be recorded on the log. Standard drilling procedures are presented in Appendix A. <br /> TASK 5 Chemical Analysis <br /> Selected soil samples, and ground water samples from each boring will be analyzed for Total <br /> Petroleum Hydrocarbons calculated as Gasoline (TPH-G) by EPA Method 8015 (Modified), and <br /> benzene,toluene, ethylbenzene, xylenes, and methyl-tertiary-butyl-ether by EPA Method 8020. <br /> 96374 3 <br />