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SECTION IV. <br /> FINDINGS <br /> The Limited Phase II was performed in order to evaluate recognized environmental conditions <br /> (RECs) identified by review of documents provided to PEI. This addendum expanded the <br /> original scope of the investigation to focus on areas found to be impacted by analytes of <br /> interest (VOCs, TPH-ccid) from the initial Phase II performed by PEI. <br /> Groundwater movement has been calculated to be (generally) from east to west (Figure 3). <br /> The analytical results of testing soil matrix samples from 8 soil borings (31 samples) for VOCs <br /> and TPH-ccid (Appendix B) shows that those analytes were not detected in any soil matrix <br /> sample tested. <br /> Laboratory testing results for groundwater samples (SB-1 to SB-7) are summarized below in <br /> Table 1 (Groundwater Sample Results). <br /> Based upon the scope of work performed and the data collected, PEI's findings are generally <br /> summarized as follows: the groundwater beneath and adjacent to the septic system(including <br /> the leach field) has been impacted by petroleum-related compounds above California <br /> Department of Public Health (CDPH) drinking water Maximum Contaminant Levels (MCLs) <br /> for benzene (1 µg/L) and 1,2-dichloropropane (5 µg/L). The area of impact extends towards <br /> the northwest from the septic system area(Figure 2). <br /> Table 1 —Groundwater Samples <br /> Volatile Organics EPA 5030B/8260B Results* <br /> (concentrations in ug/L=ppb) <br /> Groundwater Chloro 1,1- 1,1- Cis- 1,2- Ethyl- TCE m,p- 0- <br /> Sample Number Acetone Benzene form DCE DCA 1,2- Dichloro Benzene Freon 12 PCE Toluene Xylenes Xylene <br /> (Depth) DCE propane <br /> SB-1001 <1 <1 1.0 <1 <1 <1 <1 3.96 <1 <1 <1 24.3 9.93 <br /> SB-1001 dupl <1 <1 <1 <1 <1 <1 <1 4.52 <1 <1 <1 27.9 11.7 <br /> SB-1002 <1 47.0 <1 <1 <1 <1 24.1 <1 <1 <1 <1 <1 <1 <br /> SB-1003 19.5 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <br /> SB-1004 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <br /> SB-1005 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <br /> SB-1006 <1 8.61 <1 <1 <1 <1 31.6 <1 <1 <1 <1 <1 <1 <br /> SB-1007 <1 <1 <1 <1 <1 <I <1 <1 <1 <1 <1 <1 <1 <br /> MCLs* unl 1 80t 6 5 6 5 300 unl 5 150 total xylenes <br /> =1750 <br /> *MCL—California Department of Public Health Maximum Contaminant Level for drinking water <br /> tChloroform individually unlisted. Total trihalomethanes=80 <br /> un1=unlisted for this compound <br /> Addendum to Limited Phase II Environmental Site Assessment Report Pinnacle Environmental,Inc. <br /> 248 Industrial Avenue,Stockton,CA 95206 Page 9 <br />