Laserfiche WebLink
4.0 RESULTS <br /> This section presents the results of field sampling performed at NAVCOMMSTA Stockton for <br /> tank 817B-2 and tank testing results for 817B-1 and 81713-3 Laboratory reports for all soil samples <br /> are presented in Appendix C and tank testing documentation in Appendix D This section also <br /> ' presents a discussion of the nature and extent of contamination <br /> ' Soil Sample Anal3qical Results <br /> ' A review of the analytical results received from Compu Chem Western Division (Chem West) <br /> of Sacramento, California, indicates that holding times for organic lead analyses under DHS LUFT <br /> ' and EPA method 7420 may be questionable for samples NCS-3 and NCS-4 As stated in the Quality <br /> Assurance/Quality Control (QA/QC) Data Review Summary by PRC dated June 26, 1992, (Appendix <br /> ' C) there is no specified holding time for organic lead under the DHS LUFT method, however, the <br /> holding time had approached 18 days by the time the analyses were performed, thus leaving the non- <br /> detected analyte estimated and usable for limited purposes only All other data appear to be <br /> acceptable upon a cursory review <br /> Methods and specific values for each analyses are listed in Table 1 Analysis for ethylene <br /> dibromide were originally requested under EPA method 504 but were substituted with analysis for <br /> ' 1,2-dibromoethane under EPA method 8010 This was done because EPA method 8010 is more <br /> applicable to hazardous materials investigations in soils, The compound is the same with different <br /> ' names Although only organic lead was originally requested, using EPA method 7420, total lead was <br /> also analyzed by EPA method 6010 even though it was not originally requested In sample NCS-3, <br /> ' collected from the west end of the UST excavation immediately after tank removal, TPH as gasoline <br /> was reported at a concentration of 3,500 mg/kg Other organic compounds reported above laboratory <br /> ' detection limits in sample NCS-3 were 30 mg/kg benzene, 140 mg/kg toluene, 330 mg/kg total <br /> xylenes, and 77 mg/kg ethylbenzene <br /> TANKRMU NEW <br /> 0"-0162UrATRI 51i4M 13 <br />