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Enviro._ lental Restoration rv-ices <br /> :..� Site Investigations Fuellosures <br /> Remediation Technologies . Reguiarory Reporting <br /> Di Salvo Trucking Inc. �HEALTf1 24 <br /> January ,1996 <br /> 1800 Harrison St. ` `r <br /> San Francisco, CA ° OCT -7 Art 3: 31 <br /> Attn. Mr. Charles Lawler <br /> Re: Report of excavation dewatering ,sidewall sampling, and backfill at 300 Washington <br /> Ave., Stockton CA. <br /> 1.0 INTRODUCTION <br /> The purpose of this report is to present the results of an investigation to help determine the <br /> extent of hydocarbcns in soil in the vicinity of underground fuel tanks previously removed. <br /> This report documents groundwater disposal details, sampling protocols and chemical <br /> data. <br /> 2.0 SCOPE OF WORK <br /> The scope of work comprised evacuating the groundwater within the excavation; <br /> sampling the soil at the excavation sidewalls at a depth of approximately twenty feet; <br /> and backfilling the excavation. <br /> 2.1 Previous Excavation Scope <br /> An area of approximately 5000 sq. feet was excavated to a depth of approximately 20 feet. <br /> Soils from the surface to nine feet were stockpiled on the site-as clean overburden. Soils <br /> from nine feet to twenty feet were stockpiled on site to be remediated at a future date. <br /> 22 Sidewall Sampling _ <br /> On December 14,1995, four soil samples were recovered from the sidewalls of the <br /> excavation at locations shown in Figure 2_ The samples were recovered at a depth of <br /> approximately twenty feet bgs., using an excavator bucket_ <br /> 2.2.1 Soil-Sampling Procedure <br /> Under the direction of Linda. Turkatte of the. San Joaquin County Public Health <br /> Department, at the desired sample sidewall location, the excavator.bucket was driven into. <br /> the excavation sidewall until an undisturbed sidewall piece had broken.away and into the <br /> excavator bucket The excavator bucket was then brought to- the ground surface for <br /> observation. Under the direction of Linda Turkatte, a: sleeved, bullet sampler was then <br /> driven into the undisturbed piece of sidewall'untii-the sample container had completely filled <br /> with soil. Upon removal of the sample container from the bullet sampler, the container ends <br /> were sealed with Teflon sheets and plastic caps. <br /> 1115 Merrill.Street Menlo Park, California 94025 415/325-3216e <br />