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• SMITH • laboratory detection limit of 0 005 ppm in soil samples GP-WWI-80 and GP-WWI-120 (collected at S and 12 feet below ground surface, respectively) along the western excavation sidewall Additionally soil sample GP-EW2-12 0 (collected at 12 feet below ground surface) contained detectable concentrations of BTEX and TPHg, however it should be noted the 12 foot samples were collected beneath the groundwater surface within the excavation Soil samples collected from the bottom and northern portion of the excavation exhibited detectable concentrations of TPHg, ethyl benzene, xylenes, and/or toluene Benzene was only detected in one confirmation soil sample (GP-EW2-12 0) at 0 006 ppm due to higher detection limits for benzene in samples GP-NW-11 0, GP-B1-15 0, and GP-B2-15 0 Analytical results are summarized in Table 1 The water sample collected from the storage tank by bailer was reported to contain 1,800 (parts per billion [ppb]) TPHg, 4 0 ppb benzene, 5 4 ppb toluene, and 98 ppb ethyl benzene These results are summarized in Table 2 Composite soil samples collected from the stockpiled soil contained non-detectable to moderate levels of petroleum hydrocarbons Analytical results of soil composite samples are summarized in Table 1 Laboratory data sheets and chain-of-custody documentation are presented in Attachment 2 �1 Other Site Activities On March 30, 1995, in conjunction with quarterly groundwater monitoring and sampling site activities, Smith Environmental personnel resampled the excavation purge water stored in the on- site tank Prior to sample collection, the stored water in the tank was circulated with a pump to ensure representative sampling Subsequent to sample collection, the stored water was treated by the addition of approximately two pounds of Ammonium Nitrate to enhance biodegradation of potentially remaining dissolved petroleum hydrocarbons Following the addition of the nutrients, the water was recirculated using a pump The sample was immediately placed on ice and transported to Argon Laboratories, for analysis of BTEX and TPHg by EPA methods 8020/8015 No petroleum hydrocarbons were detected above method detection limits for the sample Laboratory data sheets and chain of custody documentation is included as Attachment 2 On May 5, 1995, Smith Environmental personnel discharged the stored purge water to the ground surface within the boundaries of the site A pump equipped with a discharge hose was used to disperse the water to the ground surface 1500811SXR-0995 DOC 4