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4 <br /> 4406gkal-r"T SMC. Page 6 <br /> Sinclair&Thompson Property <br /> ,{ Additional Soil Gas Survey Report <br /> June 18,2007 <br /> � • .1. . 3 <br /> PHg was detected in SG-8 (7,600 gg/m3), SG-9 (7,600 �[.g/m ) and SG-9 duplicate <br /> (8,100 [.g/m3). These levels are 3 times less than the ESLs. <br /> 4.0 QUALITY ASSURANCE PROJECT PLAN (QAPP) IMPLEMENTATION <br /> Onerobe blank and one duplicate p p tate sample were collected and analyzed during the soil gas <br /> investigation. The probe blank was collected at the beginning of the investigation and was <br /> non-detect for the leak compound and all chemicals of concern. A duplicate .sample was <br /> collected from SG-9 at 5-feet bgs. The duplicate sample was non-detect for the 'leak <br /> compound and contained approximately the same levels of each of the chemicals of concern. <br /> Laboratory data and quality assurance information are included in Appendix A. <br /> 5.0 HEALTH AND SAFETY PLAN (HASP) IMPLEMENTATION <br /> • The area of investigation was in a rural setting <br /> • The public was not allowed within 20 feet of the workspace <br /> All vehicles were off the roadway <br /> �� • The workers wore appropriate personal protective equipment <br /> The workers wore disposable_ gloves that were changed regularly between events <br /> 6.0 FIELD VARIANCES <br /> All the borings were advanced in locations chosen by GTI and SJCEHD staff and directed by <br /> SJCEHD. The locations were chosen to clearly define the possible threat of vapor intrusion <br /> as�implied by the benzene and TPHg concentrations detected previously in SG-1. <br /> 7.0 CONCLUSIONS AND RECOMMENDATIONS <br /> Benzene has the highest vapor pressure of the BTEX constituents and thus is the most <br /> likely constituent to be detected in the vapor phase. <br /> • Benzene was non-detect above reporting limits and ESLs in all sample locations. <br /> • All analyzed constituents, collected from the remaining sample points, were non-detect <br /> and/or significantly below ESLs. <br /> • Quality control sample (Probe Blank) was non-detect above laboratory reporting limits <br /> for all analyzed constituents: <br /> • Quality control sample(SG-1 Duplicate) confirmed the concentrations detected in SG-9 <br /> were accurate. <br /> Quality control• compounds (leak check) were non-detect above laboratory reporting <br /> t limits. <br />