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I 1 f ' GROUNDWATER MONITORING REPORT USA PETROLEUM STATION #110 OCTOBER, 1994 2.0 GROUNDWATER MONITORING WELL SAMPLING METHODOLOGY ' 2 1 Groundwater Elevations Depth to groundwater measurements were collected on August 30, 1994 using an electronic water ' level indicator The depths were measured from the top of the surveyed well casings Groundwater measurements collected during this and previous events are presented in Table I ' 2.2 Monitoring Well Purging Each monitoring well was purged with a 4-inch submersible pump until at least three equivalent well volumes of water had been removed All purging and sampling equipment was washed in a Alconox sollution and rinsed with distilled water prior to each usage to reduce the potential of cross contamination between wells As groundwater was removed from the wells, pH, temperature and conductivity were monitored and recorded on field data sheets, which are j ' maintained in our office The wells were allowed to stand for a period of time) to regain equilibrium prior to sampling Groundwater purged from the wells was placed in DOT approved 55 gallon drums The contents will be disposed of using proper methods and protocol after analytical result review A summary of field data is presented in Table II, and copies of the field data sheets are inlcuded in Appendix C ' 23 Groundwater Sampling ' Each groundwater sample was collected using a new sterile disposable bailer The sampled water was placed in laboratory prepared sterile 40 milliliter glass, one liter plastic, and one quart amber ' containers The sample containers were filled to the top to expell air space and were sealed with teflon-lined caps Water sample containers were labled with the name of the sampler, the date, the fob number, the perservative, and an identifying number The samples were then transported ' to Sierra Laboratories, in Anaheim, California a California certified laboratory Full chain of custody protocol was followed during sample handling and delivery ' 2.4 Groundwater Analyses ' Analyses of the groundwater samples were performed by Sierra Laboratories in accordance with state guidelines and EPA protocol The samples were analyzed for TPH-G, TPH-D, BTEX, and total lead using EPA methods 8015, 8020 and 7421, respectively 1 5007 J3 3 i