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VVZ1 INC <br /> 49 8.0 SOIL AND GROUNDWATER REMEDIATION <br /> 8.1 Soil Remediation <br /> A soil remediation workplan was prepared by McLaren during November and December 7 <br /> 1988 and submitted to County Public Health on December 7, 1988 In accordance with the <br /> workplan, over excavation of hydrocarbon-contaminated soil was begun on April 6, 1 <br /> to remove soils contaminated with petroleum hydrocarbons As described in Sectio 2 2 <br /> of this report, approximately 45 cubic yards of hydrocarbon-contaminated soil ere <br /> excavated and stockpiled on the site <br /> McLaren prepared a soil vapor extraction (SVE) system pilot study workplan for Sebastiani <br /> to remediate the soil in conjunction with a groundwater pump and treat system This <br /> workplan was submitted to County Public Health during October 1989 (McLaren, 1989b) <br /> The workplan identified a scenario that would allow Sebastiani to stay in compliance with <br /> Regional Board and County Public Health technical requirements for soil and groundwater <br /> remediation at the site However, Sebastiani elected to not execute the proposed workplan <br /> During November, 1990, WaterWork , a consultant group, was retained by Sebastiani to <br /> prepare a revised workplan for soil and groundwater remediation (WaterWork, 1990) <br /> WaterWork identified several potential technical shortcomings with the proposed workplan <br /> that McLaren had designed for proposed soil and groundwater remediation WaterWork <br /> (1990) pointed out that the six soil borings that McLaren had previously drilled (McLaren, <br /> 1989x) had been located immediately adjacent to the former tank location (Soil Borings 1-5 <br /> and MW-1) Soil samples from each of the borings were collected at approximately 14 to <br /> 17 feet bgs and were submitted to an analytical laboratory for analysis of TPH-G and <br /> volatile organic compounds None of these samples were reported to contain volatile <br /> organic compounds with concentrations that were above Regional Board recommended <br /> typical action levels Benzene was reported at concentrations below analytical method <br /> detection limits for all samples analyzed Undifferentiated gasoline hydrocarbons (TPH-G) <br /> 19150011 005 30 <br />