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Working To Restore Nature <br /> L. In July 1993, a subsurface investigation was conducted at the site by AquaGeosciences Inc. to <br /> determine the extent of petroleum hydrocarbons present in soil and to determine if groundwater <br /> had been impacted. This included drilling eight soil borings and collecting soil samples (Plate <br /> 3). Three of these borings were completed as shallow groundwater monitoring wells (MW-1, <br /> MW-2 and MW-3). Analysis of soil samples indicated that the majority of petroleum <br /> hydrocarbons in soil were present from about 10 feet below ground surface (bgs) to groundwater <br /> L at a depth of approximately 29 feet bgs and within a radius of 35 feet from the former UST pit. <br /> Laboratory analytical results are presented in Table 1. <br /> L <br /> In August 1993, wells MW-1, MW-2, and MW-3 were monitored and sampled by <br /> L AquaGeosciences Inc. Analytical results showed that MW-1 had no measurable concentrations <br /> of petroleum hydrocarbons in the groundwater. Wells MW-2 and MW-3 contained detectable <br /> i. levels of petroleum hydrocarbons. <br /> As requested by SJCPHS, groundwater samples were collected by RESNA from three shallow <br /> monitoring wells (MW-1, MW-2 and MW-3) in March and June 1994. Again, analytical results <br /> L showed that MW-1 had no measurable concentrations of petroleum hydrocarbons in the <br /> groundwater. Wells MW-2 and MW-3 contained detectable levels of petroleum hydrocarbons. <br /> L The locations of the monitoring wells are shown on Plate 2. Monitoring data and laboratory <br /> analytical results are contained in Tables 2 and 3, respectively. <br /> L <br /> EXTENT OF TPHg IN SOIL AND GROUNDWATER <br /> SJCPHS has requested that this workplan provide for additional monitoring wells to define the <br /> extent of groundwater contamination and an additional soil boring to define the extent of soil <br /> contamination at 30 feet below ground surface (bgs) to the north of the site. The following <br /> paragraphs contains RESNA's recommendations based on previous work completed at the site. <br /> LTo date, three quarters of groundwater monitoring have been completed. Results indicate that <br /> t the groundwater flow direction has been to the southeast (two quarters) and to the east-northeast <br /> t J <br /> V <br /> 150078\REPORTS\WP-0890.FNL 2 <br /> V <br />