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M6q/ Z CHAPTER 2 FIELD METHODS Brown and Caldwell Consultants' (BCC) July 11. 1990 work plan describing this phase of work is included in Appendix A of this report. The field methods employed during this investigation were in accordance with the work plan with the following exceptions and comments: • BCC attempted to obtain landowner permission to install proposed off-site monitoring wells ATR-8 and ATR-1 l well in advance of conducting the investigation. Landowner permission had nor been granted by the time the fieldwork was completed so the installation of these two wells has been delayed indefinitely. • The monitoring wells were installed under San Joaquin County Public Health Services, Environmental Health Division (County) Permit numbers 90-2360, 90-2361, and 90-2362. In addition to the County p,-nn-Lits, the off-site wells in City of Tracy right- of-way were installed under encroachment permit number 90-209. Copies of the permits are included in this report as Appendix B. r The approximately 4 yards of soil generated from this investigation was temporarily stored on site pending laboratory analysis of a composite sample of this snil. On January 17, 1991, the soil was transported by Dillard Trucking Company to BFI in Livermore, California. • The groundwater generated from the development of new wells and purging of the other wells was transported off site immediately following generation. A bill of lading for this water is included in Appendix C. The groundwater generated during the pump test (approximately 4,000 gallons) was transported off site by Universal Engineering to Gibson Oil Company located in Bakersfield, California. • Analytical testing for fecal coliform and nitrates was performed on groundwater samples from monitoring wells ATR-9, ATR-10, and ATR-12. These analyses are required by the County because these wells are located within 50 feet of the sanitary sewer. -- ---- - The closest-survey benchmark-is-located-approximately_1.5_miles north of the site. _ To survey from this benchmark would have required an inordinate amount of time, so an arbitrary benchmark was established on site. An elevation of 50.00 feet was assigned to this benchmark and all well elevations are based on this. �..- ,�,•A�®awinn u��emae,r�Sl.�RIAilIRIIk4'!