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+ • Mr Nuel Henderson,Jr, SJCEHD June 27,2005 <br /> Former Apache Plastics Facility, Stockton,CA Project No 2005-2050-01 <br /> Well Installation and Destruction Letter Report <br /> Page 4 <br /> Analytical Methods <br /> Soil and groundwater samples were forwarded to Alpha Analytical, Inc , a California state- <br /> certified laboratory (ELAP 42019), for chemical analysis under strict chain-of-custody <br /> procedures Soil and groundwater samples were analyzed for total petroleum hydrocarbons <br /> as gasoline (TPHG) using USEPA Method SW8015B DHS/LUFT Manual, and for benzene, <br /> toluene, ethylbenzene, and total xylenes (BTEX), methyl tertiary butyl ether (MTBE), ethyl <br /> tertiary butyl ether (ETBE), di-isopropyl ether (DIPE), tertiary amyl methyl ether (TAME), <br /> tertiary butyl alcohol (TBA), 1,2-dichloroethane (1,2-DCA), and 1,2-dibromoethane (EDB), <br /> using USEPA Method SW8260B Soil analytical results are presented in Table 1 and <br /> groundwater analytical results are presented in Table 2 Certified Analytical Reports with <br /> chain-of-custody records are presented in Appendix C <br /> Analytical Results <br /> Petroleum hydrocarbons were not detected in any of the soil samples collected from well <br /> borings MW-15, MW-16, or MW-17 <br /> Four groundwater sampling events have been completed using wells MW-15 through <br /> MW-18 TPHG has been reported at maximum concentrations of 90 micrograms per liter <br /> (µg/L) (well MW-15), 490 1ig/L (well MW-16), and 450 µg/L (well MW-18) Benzene has <br /> been reported at maximum concentrations of 0 73 µg/L (well MW-16), 0 84 µg/L (well MW- <br /> 17), and 19 µg/L (well MW-18) TBA has also been reported in samples collected from <br /> wells MW-16 through MW-18, at concentrations ranging from 13 µg/L to 110 µg/L 1,2- <br /> DCA has been detected in samples collected from each of the newly installed wells, at <br /> concentrations ranging from 1 7 µg/L to 210 µg/L) <br /> LIMITATIONS <br /> This report was prepared in general accordance with accepted standards of care that existed <br /> at the time this work was performed No other warranty, expressed or implied, is made <br /> Conclusions and recommendations are based on field observations and data obtained from <br /> this work and previous investigations It should be recognized that definition and evaluation <br /> of geologic conditions is a difficult and inexact art Judgments leading to conclusions and <br /> recommendations are generally made with an incomplete knowledge of the subsurface <br /> conditions present More extensive studies may be performed to reduce uncertainties This <br /> report is solely for the use and information of our client unless otherwise noted - <br /> i <br /> K\Apache Plastics\Reports\Apache-well-install-destruct-letter report doc <br />