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3 <br /> a <br /> MF <br /> MIA <br /> 103M. maju, <br /> 1M'.x <br /> l <br /> 9 December 1991 <br /> (GeoAudit cV 42F'5-1.26) <br /> Page 3 of 7 <br /> It is our understanding that two soil samples were collected from <br /> " beneath each tank by Waterwork, Inc. and a t;cal.dSmples T/Wfor -DC <br /> hydrocarbons (BTEX compounds) by Applied Ana1y <br /> W13 and T/W-D-E13 from beneath the diesel tank were <br /> also na and <br /> for high-boiling-point hydrocarbons (TPH-D) Samples <br /> T/W-G-E15, from below the gasoline tzink, wereTfiLC)analyzed <br /> and for <br /> low_ <br /> ethylene <br /> boiling-point hydrocarbons (TPH-G) , <br /> dibromide. These samples were subsequently analyzed for leachable <br /> alead ttache T.rThe results Copies <br /> a summarized below and in chain <br /> ableuI. ody are <br /> RESULTS <br /> T/W-G--W15 had TPH-r concentrations <br /> low 3 <br /> and <br /> Samples T/W-G-E15 and but <br /> 13 ppm, respectively. These concentrations are q <br /> nonetheless indicate that an unauthorized release infboth sampless <br /> occurred. BTEX compounds were in excess of pin the two samples, <br /> Total lead concentrations were 11 and 14 pp <br /> M.which is typical for the area. Leachable concentrations were ' <br /> predictably less than the 5 ppm hazardous limit. EDB's were not <br /> detected. <br /> he diesel <br /> nk <br /> The sample fr(72Dben m di diesel and allthe west dof BTEXtcompounds in excess ofwas r5 <br /> contaminated PP <br /> ppb) than either the sample :from beneath the pastern end (ND for <br /> TPH-D and ethylbenzene) or the samples from beneath the gasoline <br /> tank. <br /> PROPOSED ASSESSMENT <br /> is a high risk <br /> Due to he ere <br /> of both sshallow groundwater <br /> oil andgroundwatercontamination. Thislworkplan addresses <br /> both questions. <br /> We propose to overexcavate the tank cavity and remove the <br /> contaminated soil, if possible. An executive summary describing <br /> mitted to EHD and the Stockton Public Library <br /> this task was trans91. We also propose <br /> for public comment is to detebrmine9the groundwater gradi nt on the <br /> three monitoring wel <br /> site and to ascertain whether groundwater u p s been 75cft from contaminated. <br /> These will be installed at distances of <br /> excavation around its perimeter (see Figure 2) . Additional wells <br /> may be installed at a later date, depending on the results of <br /> samples obtained from the initial wells. Details of the assess <br /> and remediation procedures are provided on the following p g <br /> �.a <br />