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site History <br /> 14000 Highway 88,Lockeford,CA <br /> Time Oil Property No 04-049 <br /> To date, the extent of groundwater Impacts have not been defined in any direction Between the Third <br /> and Fourth Quarters of 1995, gasoline and BTEX concentrations increased slightly in MW-4, however, <br /> they decreased in MW-1 MW-2, and MW-3 The observed fluctuations in hydrocarbon concentrations <br /> may be a result of seasonal variation in groundwater levels and/or a result of bioattenuation, however, <br /> not enough data has been collected to evaluate their significance Future data will be used to evaluate If <br /> significant trends in hydrocarbon concentrations In groundwater exist <br /> Workplan for Additional Soil and Groundwater Investigation - January 1996 <br /> Based on the results of the previous Investigation, a workplan was prepared for the installation of six <br /> additional groundwater monitoring wells to define the extent of soil and groundwater impacts associated <br /> with the former underground storage tanks at the subject site On January 25, 1996, SECOR's <br /> "Quarterly Status Report and Work Plan for Additional Environmental Investigation" was forwarded to <br /> the appropriate regulatory agencies Briefly, proposed site activities consist of the following <br /> 1 Six borings would be advanced to approximately 100 feet below ground surface (or to 10 feet below <br /> first encountered groundwater) <br /> 2 Soil samples would be collected from each boring at 5-foot intervals and submitted for gasoline and <br /> BTEX analyses based on visual observation and field instrumentation readings A minimum of three <br /> samples would be submitted from each boring <br /> 3 Two-inch diameter groundwater monitoring wells would be installed in each of the borings Each of <br /> the wells would be screened from 5 feet above to at least 10 feet below the first encountered <br /> groundwater <br /> 4 The completed wells would be developed, surveyed, and sampled <br /> Should the results of the additional investigation Indicate that the extent of soil and groundwater <br /> contamination Is been defined, a Problem Assessment Report would be generated Otherwise, a report <br /> containing details of the additional field activities, well construction details, and analytical results would <br /> be prepared <br />