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f R V 2.0 INVESTIGATION METHODS a I A proposal for a Phase Two Site Investigation was submitted on May 28, 1997 and j fieldwork was completed on June 24, 1997. Procedures in the proposal were adhered to j during the field activities. A site specific health and safety plan (HASP) was developed in accordance with the Occupational Safety and Health Administration (OSHA) l guidelines set forth in"Hazardous Waste Operations and Emergency Response" (29 CFR 1910.120). The HASP was reviewed and signed by all ENTRIX personnel and subcontractors performing work on the site. A copy was present on-site at all times and was kept in an easily accessible location. i j I Utility clearance was obtained at the site prior to commencing with subsurface installations. The Underground Services Alert network was notified at least 48 hours prior to the start of work activities. Because an underground irrigation pipeline is known to exist in the vicinity of the inactive septic system, the South San Joaquin Irrigation District was contacted and the pipeline location marked prior to the commencement of activities. A San Joaquin County well permit was applied for and received prior to initiating field drilling activities. Mr. Steve Sasson of the County of San Joaquin observed boring abandonment operations at the site. All borings were drilled. and abandoned in compliance with permit requirements. A copy of the well permit application is included in Appendix A. The remainder of this section summarizes activities conducted to complete the soil sampling and analysis plan submitted in the proposal. 2.1 VISUAL INSPECTION OF SEPTIC SYSTEM AND OIL—WATER SEPARATOR The inactive septic system was pumped out by Clark's Septic Service of Manteca, CA on i June 24, 1997. The material in the tank contained domestic waste and oily sludge. After 2-1