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"' �51�' "`u " '�d�a'' 9r I'''�",r�. ". 3 �M�ia'� ""'.`4rt�r''�n, r .,,� a�'v> �,• wt�d '�'.:.1�.C*�- �S:if �y`� "�' y <br /> w <br /> CIIAP'CER z <br /> FIELD METHODS <br /> Brown and Caldwell Consultants(BCC's)March 10, 1990, Work Plan for this investi a!ion <br /> is included in Appendix A of this report. The work plan w g <br /> Regional P a,submitted to and IPProved by the <br /> g Water Quality Control Board, <br /> submitted to the San Cenria, Valley Region. 77le work plan <br /> ..' Joaquin Count Environmental Health Division. The field Methwas also <br /> County <br /> s` a employed during this investigation are in accordance with the following <br /> e work plan with th �s <br /> exceptions and comments: g <br /> The groundwater generated during tl;e redeveloPment and sampling of the on-site <br /> monitoring wells was transported off site by Armour Petroleum Company under <br /> s a bill lading. A copy of the bills of ladia are included as Appendix ppendix B of this <br /> rePon- The purge water was disposed of at the fireman's tm,ining center located <br /> : U, Fairfield, California- Armour Petroleum Company was operating under a <br /> subcontract to BCC. <br /> To eliminate the possibility of cross contamination between wells,ali monitoring <br /> wells were sampledusing'a disposable polyethylene bailer for each well, not a <br /> teflon bailer. <br /> • Because of very low <br /> Permeability in the soil adjacent to some of the wells, it <br /> was not possible to purge three well volumes of water from those wells. A table <br /> Presenting the pH,electrical conductivity, and the volume of water purged from <br /> x- each well prior to sampling can be found in Chapter 4. <br />