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24 July 1997 AGE-NC Project No. 97-0349 Page 3 of 5 will be advanced within the former UST area. The proposed soil probe boring location is illustrated on Figure 2. Discrete soil samples will be collected at five-foot intervals beginning at a depth of 5-feet bsg using a Geoprobe soil sampling assembly loaded with four pre-cleaned 1.125-inch by 6-inch brass sleeves. Soil samples will be preserved by covering both ends of the second brass sleeve with Teflon sheets, capping and sealing with tape. Each sample sleeve will be labeled with the following information: soil probe boring location, depth, time, date and sampler's initials. Initially,soil samples will be collected to a depth of 50 feet bsg. If petroleum hydrocarbon-impacted soil is encountered during probing activities,probe borings may be advanced to greater depths in an attempt to determine the vertical extent impacted soil. One grab ground water sample will be collected from the probe boring. The grab ground water sample will be collected using a Geoprobe water sampling assembly. For the sampling assembly, probe rods will be fitted with a retractable ground water screen and advanced to the total depth of each probe boring;the rods will then be pulled upward to allow ground water to flow into the screen. A bailer fitting will then'be placed on the end of 3/s-inch diameter polyethylene tubing, inserted through the rod assembly into the exposed screen, through which water will be manually pumped. 3.2. EQUIPMENT DECONTAMINATION All probing rods, sampling tools and sample liners used for sample collection will be thoroughly rinsed with clean water after washing with a solution of Alconox. 3.3. LABORATORY ANALYSIS Selected soil samples will be analyzed for TPH-d, BTE&X and methyl tert-butyl ether(MTBE) in accordance with EPA methods 8015m and 8020/602. Furthermore, the gr ground water sarn le will also be analyzed for volatile organics in accordance with EPA metho 82 . abcratory reports and sample chain-of-custody documentation will be presented in a report with the findings and recommendations. Soil samples will be selected for analysis based upon field observations. 24 July 1997 AGE-NC Project No: 97-0349 Page 4 of 5 4.0. PROCEDURES 4.1. ADVANCEMENT OF SOIL PROBE BORINGS The following procedures will be performed for the installation of probing(s): 1. Notify the PHS-EHD at least 48 hours prior to commencement of any work. 2. Initially,advance one(1)soil probe boring at the site to a depth of approximately 50 feet bsg. if petroleum hydrocarbon-impacted soil is encountered during probing activities, probe borings may be advanced to greater depths in an attempt to determine the extent impacted soil. 3. Probe borings will using a van-mounted Geoprobe probing unit equipped with 1.125-inch diameter rods. Proposed probe boring location is depicted on Figure 2. 4. Decontaminate sampling equipment in an Alconox solution and rinse with water prior to each sampling run. 5. Obtain soil samples at five foot intervals using a Geoprobe soil sampling assembly pre- loaded with four 1.125-inch by 6-inch brass sleeves. 6. Preserve soil samples in the second brass sleeve by covering both ends with Teflon sheets, capping,and sealing with tape. Each sample will be labeled with the following: site location, sample identification, depth, time and date. 7. Document samples on a chain-of-custody form. 8. Store samples in a chilled container and transport to a State-certified laboratory for analysis. 9. Monitor soil sample duplicates for the presence of volatile organics using a photo-ionization detector (PID) pre-calibrated to isobutylene. 10. Log soil sample duplicates in accordance with the Unified Soil Classification System. 11. Collect a grab ground water sample from selected probings. Ground water samples will be collected using a Geoprobe water sampling assembly. A ground water sample will be collected at each sampling point in 40-m1 VOA vials containing hydrochloric acid and one- liter amber bottles. 12. Transmit each ground water sample to a State-certified laboratory under chain-of-custody procedure. 13. Backfill each probe boring to surface grade using Portland type II cement. 14. Selected soil and grab ground water samples will be analyzed by a State-certified laboratory Advaneed GeoEnvironmental,Inc.