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i <br />' 3.0 GROUNDWATER MONPTORING AND SAMPUING <br /> 331 Field Groundwater Monitoring and Sampling <br /> Groundwater monitoring wells for the former Parmar Texaco site(PT-MWi to 6)were probed <br /> for water depth on August 24, 2005. The six wells were probed for depth to groundwater <br /> surface, presence of free-floating product, and depth to bottom of well The wells were sampled <br /> in accordance with the P14SEHD approved site characterization workplan(Muir, 2003)using <br /> groundwater monitoring procedures outlined in Appendix 1. <br /> The wells were initially inspected for integrity and general maintenance conditions with the <br /> findings reported on the Well Development/Purging Workshects 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 slight but pronounced <br />' sheen and product layer was visible on the tape and bailers used to sample monitoring wells PT- <br /> MWI, 2 and 3 These wells had a slight, free-product layer on top of the groundwater surface <br /> approximately 0.005 foot thick No product layer or sheen was visible in the bailers used for the <br /> 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 1 5" 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, electrical conductivity(Ec)were measured and recorded on <br /> individual well field worksheets during the water purged from each monitoring well Results are <br /> 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 /> IAll sampling equipment was decontaminated by Alquinox and followup distilled water rinse <br /> MaM\MEnvnv tallPan lczacoUteQofizlQMR093045 WO 4 <br /> I <br />