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' 129 East Center Street October 14, 1993 <br /> Manteca, California Page: 3 <br /> Phase II Underground Tank Investigation <br /> 1 <br /> ' 3.1 Soil Sampling <br /> All soil sampling equipment will be thoroughly steam-cleaned before and between <br /> ' sampling to prevent cross contamination. Relatively undisturbed soil samples will <br /> be taken at intervals of not more than 5 feet in order to evaluate the subsurface <br /> materials, however, this sampling interval may be waived in saturated sands in <br /> ' which sample recovery is not possible. <br /> The soil samples will be taken using a California Modified Split Spoon sampler <br /> with brass liners. The sampler will be driven continuously by a wire line hammer. <br /> The laboratory samples will not have head space and will be immediately sealed in <br /> ' their liners using aluminum foil lined plastic caps. The samples will be refrigerated <br /> immediately for delivery to the laboratory and will under no circumstances be <br /> opened by anyone other than laboratory personnel. Chain of Custody records will <br /> be maintained at all times (Figure 4). The remaining sample will be removed from <br /> its liner to be used as an aide to the on-site geologist in logging the material at that <br /> depth. <br /> Soil samples collected for analysis will be analyzed using EPA method 5030/LUFT <br /> for gasoline range petroleum hydrocarbons and EPA method 8020 for BTX&E <br /> compounds. The minimum detection limits used for each analyte will be .005 <br /> mg/kg for BTX&E, and 2.5 mg/kg for gasoline. Analyses are to be conducted by <br /> Geo-Monitor Laboratories, Inc. <br /> Prepared by <br /> t •:... <br /> 01 > _ Mr1 OxMaKLr <br /> No.02157 <br /> � * A <br /> 4Mce17. Klobe dant, REA, REHS Expires: G -`5 <br /> California Registered Environmental Assessor#02157 <br /> California Registered Environmental Health Specialist #4783 �rFOF cAt•tfo� <br /> �oQPOFESSI, <br /> NO < �` <br /> c - w 22 339 M <br /> crEXP.930- a <br /> A. Lee DeLano, CE, P.E. 97 <br /> Registration 4 22339 �f9OF0AYF�Q�\P <br />