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PRE-TANK REPLACEMENT Site Assessment Work Plan <br />4315 Waterloo Road Stockton, CA. <br />Aegis Project No. 89-047 <br />Page 10 <br />2.11 Water Well Information <br />A water well search will be conducted through the State of California <br />Department of Water Resources indicating where water wells exist <br />within a 1/2 mile radius of the site. The locations of local water <br />wells will be shown on a figure to be included in the assessment <br />report. <br />3.0 PROPOSED WORK PLAN <br />A total of fourteen soil borings will be advanced according to San <br />Joaquin County guidelines at the locations shown in Figure 2. Four <br />soil borings will be advanced to estimated maximum depths of 20 feet <br />below grade in the area of the existing underground fuel storage <br />tanks. Six soil borings will be advanced to estimated maximum depths <br />of 20 feet below grade at the location of the replacement underground <br />fuel storage tanks. Four soil borings will be advanced to estimated <br />depths of 10 feet below grade along the product line trench and pump <br />islands. Soil borings will be advanced using a 6-inch diameter hollow <br />stem auger. All soil borings, upon completion, will be abandoned to <br />the surface with a cement bentonite powder mix. Soil samples will be <br />collected using brass liners in a California-modified split-barrel <br />sampler. <br />Soil samples will be collected at a maximum vertical spacing of 5.0 <br />feet and will be screened in the field with a portable photoionization <br />detector (PID) or an organic vapor analyzer (OVA) to determine organic <br />vapor content. Selected soil samples will by sent to a state- <br />certified-laboratory for analysis. Samples will be analyzed for <br />benzene, ethlybenzene, toluene, xylenes (BTEX), 1,2-dichlorobenzene, <br />1,3-dichlorobenzene, and 1,4-dichlorobenzene, total petroleum <br />hydrocarbons (TPH) and total lead. EPA methods used in the analyses of <br />soil samples are described in Section 4.0 <br />The total volume of cuttings removed from the soil borings is expected <br />to be between two and three cubic yards. Material removed from the <br />borings will be placed on and covered by visquene. Two composite <br />samples will be obtained to classify stockpiled soil. One sample will <br />be analyzed for TPH, total lead, inorganic lead and organo lead. The <br />remaining sample will be frozen and retained by the laboratory for <br />further testing, if required. The barrels will be legally disposed of <br />upon confirmation of the contents from the analytical soil sample <br />results.