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• ..♦ - _ v Nftwl 19 May 1997 AGE-NC Project No. 96-0266 Page 6 of 8 -6.0. PROCEDURES 6.1. DRILLING AND .SAMPLING. The following procedures will be performed for the installation of ground water monitoring wells.- 1. ells:1. Notify the PHS-EHD at least 48 hours prior to commencement of any work, while securing proper county permits. 2. Mark boring locations at least 4.8 hours in advance for an Underground Service Alert(USA) check of underground utilities or pipes. 3. Advance five soil boring utilizing a truck-mounted drill rig, and 8.25-inch diameter hollow stem augers. The borings will be advanced to a total depth of approximately 20 feet. Proposed boring locations are depicted on Figure 2. 4. Decontaminate all sampling equipment in anAlconox solution and rinse with water prior to each sampling run. Steam-clean auger flights before advancement of each boring. 5. Collect soil samples at 5-foot,intervals in each boring beginning at a depth of 5-feet bsg. Samples will be collected using a California split-spoon sampler loaded with three 2-inch by 6-inch brass sleeves. The sampler will be driven by dropping a 140-pound weight from a height of 30 inches. The number of blow required to advance the sampler in 6-inch increments will be recorded on the boring log. 6. Preserve soil in the lead sleeve by.covering both ends with Teflon sheets, capping, and sealing with tape. 7. Label and log samples on a chain-of-custody form. 8. Store samples in a chilled container and transport to a State certified laboratory for analysis. 9. Selected soil samples will be analyzed for total petroleum hydrocarbons quantified as gasoline (TPH-g), total petroleum hydrocarbons quantified as diesel (TPH-d), volatile aromatics(benzene,toluene, ethyl benzene and total xylenes: BTE&X) and methyl tertiary butyl ether(MTBE) in accordance with the appropriate EPA methods, 8015m and 8020. 10. Selected soil samples collected will be analyzed for the following metals; cadmium, chromium, nickel, lead and zinc in accordance with EPA method 6010. If soil samples are in excess 150 ppm of lead or five time the total threshold detection limit of any of the metals, the sample will also be analyzed by a STLC (soluble threshold limit concentration) extraction in accordance with California Title 22 and EPA methods 6010. 11. Monitor auger returns and soil sample duplicates for the presence of volatile organics using a photo-ionization,detector(PID)pre-calibrated to isobutylene.