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23 July 1998 AGE-NC Project No. 98-0463 Page 4 of 4 Guidance Manual for Hazardous Waste Site Activities (Prepared by National Institute for Occupational Safety and Health Administration, U.S. Coast Guard and U.S. Environmental Protection Agency, 1985). 2. Notify the PHS-EHD 48 hours prior to commencement of any work, while securing proper city/county soil boring permits. 3. Mark boring locations will be at least 48 hours in advance of field work for an Underground Service Alert(USA) check of underground utilities or pipes. 4. Advance five probe borings using a van-mounted Geoprobe equipped with a 1.125-inch diameter probe rods fitted with a retractable ground water screen and advanced to the total depth of each probe boring. Advance probe borings to depths of 20 feet bsg, if required,to reach ground water. Probe boring locations are illustrated on Figure 2. 5. Release the set pin and retract the rods upward to allow ground water to flow into the screen. Place a bailer fitting on the end of 3/8-inch diameter polyethylene tubing and insert through the rod assembly into the exposed screen. 6. Manually pump ground water into the VOA vials and 1-liter amber bottles. 7. Label sample containers with boring designation, date, time and sampler's initials, and enter onto chain of custody form. 8. Store samples in a chilled container pending transfer to a state-certified analytical laboratory under chain of custody for analysis as outlined in Section 3.3. above. 9. Backfill each probe boring using cement through a tremie pipe from total depth of the boring to three feet bsg. Backfill the remainder of the boring with clean native soil. This boring destruction method is selected to avoid future damage to agricultural equipment working the parcels, and is in accordance with well standards (section 13.17.8). 4.2. REPORTING A letter report detailing the results of the investigation will be prepared for submittal to the PHS- EHD. The results will also be incorporated into the Phase I site assessment report currently in preparation for the use of California Natural Products, Inc. The letter report will be in a format acceptable to the PHS-EHD and will be reviewed and signed by a California Registered Geologist. Advanced GeoEnvironmental,Inc.