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GRI B I Associates Geological and Environmental Consulting Services <br /> February 8, 2000 <br /> L. San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P O Box 388 <br /> Stockton, CA 95201-0388 <br /> Attention: Michael J. Infurna, Jr. <br /> Subject: Report of Soil Boring Investigation <br /> Reid Plastics UST Site <br /> LO 75 West Valpico Road, Tracy, California <br /> GA Project No. 172-01-01 <br /> L. Ladies and Gentlemen: <br /> Gribi Associates is pleased to submit this report on behalf of Reid Plastics documenting a recently- <br /> completed soil boring investigation conducted at the Reid Plastics underground storage tank(UST) <br /> site located at 75 West Valpico Road in Tracy, California. The soil boring investigation included <br /> the drilling and sampling of three soil borings (IB-IA, IB-1, and IB-2) at the site using direct-push <br /> coring equipment. The goal of this investigation was to characterize soil and groundwater quality <br /> in the vicinity of the former fuel dispenser in order to attempt to obtain regulatory closure for this <br /> �.. UST site. <br /> Both field and laboratory analytical results from the three soil borings clearly indicate that the August <br /> +� 1999 overexcavation of the fuel dispenser area down to about 14 feet in depth successfully <br /> remediated diesel-range hydrocarbons previously identified during UST removal activities in January <br /> 1999 at shallower depths beneath the removed fuel dispenser. The only detectable hydrocarbon <br /> LO encountered in any of the nine soil samples collected was 2.0 milligrams per kilogram (mg/kg) <br /> detected in the downgradient boring IB-2 at a depth of about 7.5 feet below surface. A review of the <br /> laboratory chromatogram for this analysis, which is included in the laboratory data report in <br /> �' Appendix C of this report,shows that this positive detection is not typical diesel,but rather a heavier <br /> hydrocarbon. <br /> LO <br /> Based on results of this investigation, we recommend that the San Joaquin County Public Health <br /> Services,Environmental Health Division grant regulatory closure for this site. Results from previous <br /> soil sampling after removal of the diesel UST showed no significant releases from the UST system <br /> itself. In addition, results from this investigation show that releases identified at shallow depth <br /> beneath the former fuel dispenser were adequately overexcavated and do not pose an environmental <br /> r. risk. <br /> LO <br /> 1350 Hayes Street,Suite C-14 •Benicia •California •94510 •Phone (707)748-7743 •Fax (707)748-7763 <br /> LN <br />