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23 August 1999 AGE-NC Project No. 99-0611 Page 2 of 5 Soil probe boring B 1 was advanced within the disturbed concrete located at the southwest corner of the building and was advanced to a total depth of 20 feet bsg. The western former fuel tank boring B3 was advanced to a depth of 15 feet below surface grade (bsg). The eastern former fuel tank is now covered by the northwest corner of the building on the property, so AGE advanced a soil probe boring at a 20' angle under the building to a depth of 20 feet bsg. Boring B2 was advanced within an area of patched concrete approximately 75 feet south of the building, to a total depth of 24 inches bsg. No soil sample was collected, because a UST was encountered. The depth to the bottom of the tank was approximately 76 inches bsg. A disposable hose equipped with a ball valve was utilized for the collection of a liquid sample 132-L from the UST. Soil samples were collected from each probe boring at five-foot intervals from ground surface to the total depth of the boring. Soil samples were selected for laboratory analysis based on field observations of hydrocarbon staining and odor, as well as screening using an organic vapor meter (OVM). Selected soil samples were analyzed by a California Department of Health Services (DHS)-certified laboratory for the following constituents: • Total petroleum hydrocarbons quantified as diesel and motor oil (TPH-d, TPH-mo) by EPA Method 8015 Modified/5030; • Total petroleum hydrocarbons quantified as gasoline (TPH-g) by GCFID 5030A; and • Chlorinated hydrocarbons by EPA Method 601 or 8010. Laboratory reports for soil analyses, testing methods, laboratory quality assurance/quality control (QA/QC) reports, and sample chain of custody documentation are presented in Appendix B. 2.2. GROUNDWATER SAMPLE COLLECTION AND ANALYSIS For the collection of the grab groundwater sample, soil probe boring B 1 was advanced to the top of the groundwater table as identified by collection of a saturated soil sample. Once groundwater had been encountered, a Geoprobe push-driven water sampling device was advanced two to three feet into the water bearing zone. Grab groundwater samples were collected using a Geoprobe water sampling assembly fitted with a pre-cleaned one-inch 0.01 slotted temporary well screen. The ground water sample was extracted by lowering a Teflon hose fitted with a ball valve through the hollow center of the push rods into the screen section. Samples for TPH-g and BTEX analyses were collected in laboratory-supplied, 40-m1 VOA vials containing 0.5 ml of hydrochloric acid as sample preservative. Advanced GcoEnvironmental,Inc.