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I <br /> I3.0 GROUNDWATER MONITORING AND SAMPLING <br /> 31_1 reeld Gro ndr orifi And lin <br /> 1 <br /> Groundwater monitoring wells for the former Parmar Texaco site(PT-MW I to 6)were probed <br />' for water depth on March 3, 2005 The six wells were probed for depth to groundwater surface, <br /> presence of free-floating product, and depth to bottom of well The wells were sampled in <br /> accordance with the PHSEHD approved site characterization workplan(Muir, 2003)using <br />' groundwater monitoring procedures outlined in Appendix I <br /> The wells were initially inspected for integrity and general maintenance conditions with the <br />' findings reported on the Well Development/Purging Worksheets provided in Appendix 2 <br /> Initially,the static water level was measured with an electronic water level indicator that allowed <br />' measurement of depth to approximately 0 01 foot The water level below casing and total depth <br /> of each well monitored were recorded on individual Well Development/Purging Worksheets <br /> (Appendix 2) The groundwater surface elevation was then calculated in feet,mean sea level <br />' along with total volumes to be removed prior to well sampling <br /> A clear, acrylic bailer was then used to visually inspect an undisturbed sample from the top of <br /> the water column to determine if a product layer or sheen was present A very slight but <br /> pronounced sheen and extremely thin product layer was visible on the tape and bailers used to <br /> sample monitoring wells PT-MW 1,2 and 3 These wells had a slight, free-product layer on top <br /> of the groundwater surface approximately 0 001 foot thick. No product layer or sheen was <br />' visible in the bailers used for the other monitoring wells <br /> A minimum of three well casing volumes were extracted from each monitoring well using a <br /> Teflon bailer and/or submersible 15" diameter pump This allowed a representative <br /> groundwater sample to flow from the reservoir area surrounding each wellbore into the wellbore <br /> This effort is consistent with groundwater monitoring well sampling guidelines established by <br />' the RWQCB for petroleum hydrocarbon site investigations <br /> Field parameters(pH, temperature and electrical conductivity (Ec))were measured and recorded <br /> on individual well field worksheets during the water purged from each monitoring well Results <br /> are summarized on the attached Tables 1 and 2 Purged water was placed into a 55-gallon drum <br /> onsite that had been labeled as non-hazardous <br /> Groundwater samples were collected using a disposable Teflon bailer and placed into 40 ml <br /> VOA sample containers that had been prepared with a dilute HCl solution for sample <br />' preservation and labeled The water samples were handled and transported under accepted <br /> chain of custody procedures outlined in the workplan to Kiff Analytical Laboratories,Davis, <br /> California. After sampling activities were concluded each of the wells were then secured. <br />' All sampling equipment was decontaminated by Algwnox and a followup distilled water rinse <br /> This rinse water was placed into the onsite 55-gallon drums to await storage <br />' 4 <br /> ��� �«wa�e�r�.ouupon,�Qr�o33ios�,a <br /> I <br /> 1 <br />