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li <br /> Quarterly Report - ]December 1999 <br /> Former Curtiss Pontiac Buick <br /> I2450 Toste Road, Tracy, California <br /> 1.0. INTRODUCTION <br /> I At the request of Mr Joe Toste, Advanced GeoEnvironmental, Inc (AGE) has prepared this <br /> Quarterly Report for 2450 Toste Road, Tracy, California (the site) The scope of work included <br /> installation of six additional soil probe, two ground water monitoring wells, sampling and analysis <br /> of soil and grab ground water samples,nucro-biological eti aluation of the soil and sampling of seven <br /> ground water monitoring wells <br />' The site setting is illustrated in Figure 1 A plan view of the site is illustrated in Figure 2 <br /> A summary of previous investigations at the site is included in the Preliminary Investigation and <br /> I Evaluation Report(PIER),prepared by AGE, dated 15 August 1997 and Quarterly Report,prepared <br /> by AGE, dated 18 September 1997 Ground water monitoring data collected from monitoring well <br /> MW-3,which is part of the underground storage tank(UST)release investigation at 2420 Grant Line <br /> Road, is included in this investigation to delineate the down-gradient extent of the dissolved <br /> hydrocarbon plume and to determine ground water flow direction and gradient <br /> This report is prepared in accordance with Central Valley Regional Water Quality Control Board and <br /> San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) <br /> guidelines <br /> I2.0. PROCEDURES <br /> The ground water monitoring activities were conducted in accordance with Central Valley Regional <br /> I Water Quality Control Board and San Joaquin County Public Health Services - Environmental <br /> Health Division (PHS-EHD) guidelines <br /> 21 PROBING AND SAMPLING <br /> On 04 November 1999, six soil probe borings (PB 1 through PB6) were advanced at the site, under <br /> Iobservation by the PHS-EHD Probe borings were advanced in the area of the former USTs, <br /> dispenser and northwest to the property line <br /> Probe borings PB 1 was advanced to a depth of 40 feet bsg, at which depth a `grab' ground water <br /> sample was collected All other soil probe borings (PB2-PB6) were advanced to 20 feet bsg The <br /> Ilocation of the soil probe bonngs are illustrated on Figure 2 <br /> • Probe boring PB 1 was continuously sampled(cored)using a four-foot core barrel Soil probe borings <br /> PB2 through PB6 were sampled at five-foot intervals from depth of ten to twenty feet bsg Probe <br /> Advanced GeoEnr ironmental Inc <br /> I i <br />