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10104/1999 12:22 2094671118 AGE STOCTON PAGE 03 <br /> 23 August 1999 <br /> AGE-NC project No. 99-0611 <br /> Page 2 of 5 <br /> soil probe boring B1 was advanced within the disturbed concrete located at the southwest corner of <br /> the building and was advanced to a total,depth of 20 feet bsg.The western former fuel tank boring <br /> B3 was advanced to a depth of 15 feet below surface grade (bsg). The eastern former fuel tank is <br /> now covered by the northwest corner of the building on the propertyM2t <br /> advanced soil probe <br /> goring 134 at an approximate 20° angle under the building to a depth bsg. Boxing B2 was <br /> advanced within an area of patched concrete approximately 75 feet south of the building,to a total <br /> depth of 24 inches bsg.No soil sample was collected,because a UST was encountered. The depth <br /> to the bottom of the tank was approximately 76 inches bsg.A disposable hose equipped with a ball <br /> valve was utilized for the collection of a liquid sample B2-L from the UST. <br /> Soil samples were collected frons,each probe boring at five-foot intervals from ground surface to the <br /> total depth of the boring. Soil samples were selected for laboratory analysis based on field <br /> observations of hydrocarbon staining and odor,as well as screening using an organic vapor meter <br /> (OVM). <br /> Selected soil samples were analyzed by a California Department of Health Services(DHS)-certified <br /> laboratory for the following constituents: <br /> • Total petroleurn hydrocarbons quantified as diesel and motor oil(TPH-d,TPH-ono)by EPA <br /> Method 8015 Modified/5030; <br /> • Total petroleum hydrocarbons quantified as gasoline(TPH-g)by GCFID 5030A; and <br /> • Chlorinated hydrocarbons by EPA Method 601 or 8010. <br /> Laboratory reports for soil analyses,testing methods, laboratory quality assurance/quality control <br /> (QA/QC)reports,and sample chain of custody documentation are presented in Appendix B. <br /> 2.2. GROUNDWATER SAMPLE COLLECTION AND ANALYSIS <br /> For the collection of the grab groundwater sample,soil probe boring B 1 was advanced to the top of <br /> the groundwater table as identified by collection of a saturated soil sample.Once groundwater had <br /> been encountered,a Geoprobe push-driven water sampling device was advanced two to three feet <br /> into the water bearing zone. Grab groundwatez samples were collected using a Geoprobe water <br /> sampling assembly fitted with a pre-cleaned one-inch 0.01 slotted ternporary well screen.The ground <br /> water sample was extracted by lowering a Teflon hose fitted with a ball valve through the hollow <br /> center of the push rods into the screen section. Samples for TPH-g and BTEX analyses were <br /> collected in laboratory-supplied,40-nal VOA vials containing 0.5 ml of hydrochloric acid as sample <br /> preservative. <br /> Advanced GeoEnvironmentai,laa <br />