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Ion 8 <br /> PRE-TANK REPLACEMENT Site Assessment Stork Plan <br /> 420 WEST KETTLEMAN LANE,LDDI, CA. <br /> Aegis Project No. 89-013 <br /> Page 10 <br /> under semi-confined conditions. Permeability in the Mehrten Formation <br /> ranges from high to low. Wells that penetrate the Mehrten Formation <br /> yield as high as l000 gallons per minute (gpm) . <br /> Ground water occurs within the Laguna and Victor Formations under both <br /> unconfined and semi-confined conditions. Permeability in both <br /> formations varies greatly. Wells penetrating the Victor formation <br /> generally also penetrate the Laguna Formation. Yields as high as 15oo <br /> — gpm have been reported from wells penetrating the Laguna Formation <br /> (DWR 1967) . <br /> 2.'-Z Water We11 Information <br /> A water well search conducted through the State of California <br /> Department of water resources indicates that four water wells exist <br /> within a 1/2 mile radius of the site. The Municipal water well located <br /> ;F on the southwestern corner of the site has not been in service since <br /> 1988 due to petroleum constituents in ground water. Additionally, <br /> ground water monitoring wells indicate that the source of petroleum <br /> constituents in ground water is located approximately Soo feet north <br /> west of the .site at 501 West Kettleman Lane. The locations of local <br /> grater and ground water monitoring wells are shown on Figure 4. <br /> 3.0 PROPOSED WORK PLAN <br /> ft A total of sixteen soil borings will be advanced according;to. San . <br /> i Joaquin County guidelines at the locations shown in Figure 2. Four <br /> soil borings will be advanced to an estimated maximum depth, of 20 feet <br /> below grade. in the area of the existing underground fuel storage <br /> tanks. Eight soil borings will be adv�Finced 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 to feet below grade around the pump islands. Soil borings <br /> } willbe advanced using a 6-inch diameter hollow stem auger. All soil <br /> borings, upon completion, will be abandoned to the surface with a <br /> zcement bentonite powder mix. Soil. samples will be collected using <br /> I brass liners, in a California-Modified split-barrel sampler. <br /> _ Soil Samples will be collected at a maximum vertical spacing of 5.0 <br /> i-met and will be screened in the field with a portable photoionization <br /> ? _{ detector (PID) or an organic vapor analyzer (OVA) to determine or anic <br /> vapor content. Selected soil samples will by sent to a state- g <br /> certified-laboratory for analysis. Samples will .be analyzed for <br /> 4 benzene, ethlybenzene, toluene, xylenes (BTEX) , 1,2-dichlorobenzene, <br /> 1,3-dichlorobenzene, and 1,4-dichlorobenzene, total petroleum <br /> hydrocarbons (TPH) and total lead. Method used in the analyses of soil <br /> µ samples are described in Section 4.0 <br /> r <br /> s <br />