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en viros® <br /> backfill location, in the vicinity of sample locations T-5 and T-7. Samples from 26.5 fbg <br /> were ND for TPH-G and BTEX. <br /> Groundwater samples from MW-1 through MW-3 have been ND for TPH-G and BTEX, <br /> with the exception of isolated low-level detections. TPH-G and benzene have not been <br /> detected since May 1990. <br /> Technical Objectives <br /> The technical objectives of this investigation as requested by SJCPHS are as follows: <br /> • Evaluate the extent of petroleum hydrocarbons detected in sample T-3, collected <br /> beneath the western dispenser island, and <br /> • Evaluate the potential effects of residual petroleum hydrocarbons in soil on <br /> groundwater quality. <br /> Work Tasks <br /> Task 1 - Permits <br /> Appropriate permits for drilling will be obtained from SJCPHS. <br /> Task 2 - Health and Safety Plan <br /> A site-specific Health and Safety Plan will be prepared for field work. <br /> Task 3 -Utility Clearance <br /> Proposed drilling locations will be marked and their locations cleared through Underground <br /> Services Alert (USA)prior to drilling. <br /> Task 4- Site Investigation <br /> Two exploratory soil borings are proposed in the areas shown on Plate 2. Exploratory <br /> borings will be drilled using Geoprobe drilling techniques. Use of the Geoprobe will allow <br /> placement of these borings approximately one foot from the face of the dispenser island <br /> curb on the side of the island which does not have product lines running parallel to it <br /> (believed to be the western side of the island). The boring placed on the product line side <br /> of the island will be placed approximately three feet from the face of the island curb, to <br /> avoid product lines. <br /> An Enviros geologist will supervise the drilling and describe encountered soils using the <br /> Unified Soil Classification System (USCS). Soil samples will be collected at five foot <br /> intervals and/or significant lithologic changes for lithologic description. Soil sample <br /> intervals will be screened in the field for organic vapor by measuring head-space vapors <br /> using an organic vapor meter(OVM). The borings will be terminated when OVM readings <br /> in two consecutive sampling intervals indicate that petroleum hydrocarbons have been <br /> vertically delineated. <br /> If OVM readings at sampling intervals in the vicinity of the capillary fringe indicate the <br /> presence of petroleum hydrocarbons, a groundwater sample will be collected from the <br /> 96377 2 <br />