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February 13, 1998 <br /> Page 5 <br /> from Well MW-9, saturated coarser-grained units are expected to be <br /> encountered at depths of approximately 45, 55, and 75 feet bgs. The <br /> locations of depth discrete samples will be determined in the field. <br /> The onsite boring will be advanced to a minimum depth of <br /> approximately 75 feet bgs or until two consecutive nondetect soil <br /> samples (approximately 5 feet apart), are collected. A PID will be <br /> utilized to determine in the field whether the samples are nondetect. <br /> The three offsite borings will be advanced to the depth of the <br /> proposed onsite boring. The four proposed borings will be <br /> backfilled with grout upon completing of drilling. Two generalized <br /> geologic cross-sections, included as Figure 3, will be ammended <br /> with stratigraphic information collected from the proposed borings. <br /> • Soil and Groundwater Analysis. Selected soil and groundwater q� <br /> samples will be submitted to a California State-certified laboratory X v <br /> and analyzed for the presence of TPH-g and BTEX compounds. A <br /> minimum of three to four depth discrete groundwater samples per <br /> boring (dependent on depth and number of coarser-grained saturated <br /> units encountered)will be submitted for analysis. At a minimum,the <br /> soil samples corresponding in depth to the submitted groundwater <br /> samples, and a capillary fringe sample from each boring,will be <br /> submitted for analysis. Additionally, a minimum of a soil sample <br /> every 10 feet of the onsite boring, a sample collected at the total <br /> depth of the onsite boring, and a sample approximately 5 feet above <br /> total depth of the onsite boring,will be submitted for analysis. <br /> • Report. A report will be prepared after completion of necessary <br /> field work. The report will include boring logs, boring location map, <br /> two generalized geologic cross-sections, soil and groundwater <br /> analytical results, chain-of-custody documentation, and findings. <br /> Field and laboratory procedures are presented as Attachment A. <br /> I <br /> Schedule <br /> SECOR is prepared to initiate field work within 3 weeks following approval of this <br /> work plan by the PHS/EHD and the securing of permits and offsite encroachment. A <br /> report documenting the findings of the investigation is anticipated to be submitted <br /> approximately 8 to 10 weeks after the completion of field work. <br /> 7G007-013-01/workplan <br /> F <br />