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' WORK PLAN-Monitor Well Installation Herman&Helen's Marine May 30, 1997 ' Page-2- UST excavation at depths of 9 to 12 feet below the ground surface (bgs). The samples were analyzed for TPH-G (gasoline), BTEX, TEPH (diesel), EDB (ethylene dibromide), and total lead. Laboratory ' analyses indicated elevated concentrations of TPH-G, TEPH, and BTEX constituents in the soil samples. For additional information, refer to Tank Pull Testing Results, prepared by Condor, dated November 18, 1991. At the direction of the PHS/EHD, Condor prepared a work plan to investigate the gasoline and diesel contamination associated with the former USTs (Soil and Groundwater Investigation Work Plan, dated ' May 30, 1995). The work plan was approved by the PHS/EHD and the Reclamation District #2029. On August 22, 1995, three (3) hydropunch boreholes (HP-1, HP-2, and HP-3) were drilled at the site (Figure 2, Appendix A). Ronald Rowe of the PHS/EHD was on site periodically to observe the fieldwork. Gilbert Cosio of Murray, Bums, and Kienlen Engineering was on site to observe the drilling activities as a Reclamation District representative. Two (2) of the hydropunch boreholes (BP- I and HP-2) were located on the levee and were drilled to depths of approximately 16 and 11 feet below the top of the levee (btl), respectively. The third hydropunch borehole (HP-3) was located below the levee and was drilled to a depth of approximately 6 feet below the ground surface (bgs). Soil samples were collected at five (5) foot intervals. Groundwater samples were collected using a Hydropunch II groundwater sampler. Gasoline odors were noted in each borehole. Laboratory analyses indicated concentrations of TPH-G and BTEX in the soil and groundwater samples analyzed ' from each borehole (see Tables 2.1 and 2.2, below). ' TABLE 2.1 Laboratory Results (Soil - August 1995) B T E X TPH-G TEPH ' Detection 5.0 5.0 5.0 5.0 1.0 1.0-10 Sample I.D. Limits: µg/kg µg/kg µg/kg gg/kg mg/kg mg/kg 1432-HPI-11 (#) 1,200 3,100 5,500 22,000 300 190 (diesel) 1432-HP2-11 (#) ND ND 130 2,800 22 ND 1432-HP3-5.5 61 1 68 5.2 91 7.5 16 (diesel) Note:The last number in each sample ID indicates the depth at which the sample was collected. ' Unit Conversions: ltg/kg:parrs per billion(ppb) B,T,E,X =benzene,toluene,ethyl benzene,and total xylenes. mg/kg:parts per million(ppm) TPH-G=total petroleum hydrocarbons,quantified as gasoline. 1 TEPH =total extractable petroleum hydrocarbons,quantified as diesel, motor oil, and kerosene. ND=none detected at or above laboratory detection limits. #=detection limits raised due to gasoline interference. ' `� CONDOR