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WEISS ASSOCIATES <br /> P. Hernandez / 20 July 1988 / Page 2 <br /> 1. DIAGRAMS <br /> Diagrams showing the sampling loctions and the orientations of the underground <br /> vaults and the nearby above-ground structures are included in the enclosed revised <br /> sampling plan as figures 3a through 3h. <br /> 2. ANALYTIC RELEASE FORM <br /> Prior to starting work, Diamond Walnut Growers (DWG) will submit to the SJLHD a <br /> release form authorizing the release of the analytic results for the soil sampling. <br /> 3. BORING APPLICATION <br /> WA will submit a application for soil boring to the SJLHD prior to starting work. <br /> 4. VAULT SAMPLING <br /> Since the SJLHD requested analysis of four samples from beneath each vault, page <br /> 6, paragraph 2 of the 1 May 1988 sampling plan (page 14, paragraph 2 of the enclosed <br /> revised sampling plan) is amended as follows: <br /> Soil samples will be collected from soil borings drilled beneath each end of the <br /> vaults. Two samples will bq analyzed from each boring. Samples adiacent ).g the bottom <br /> of the vaults and three to four ft beneath the vaults will be analyzed as discussed in <br /> Section 3.4. Analyzing samples from several f1 beneath L vaults increases the <br /> probability of detecting chemicals that may not have leaked directly above the location of <br /> the samples collected adiacent Lo the bottom of the vaults, <br /> 5. ETHYLENE GLYCOL ANALYSES <br /> To satisfy the SJLHD requests for verification of the ethylene glycol analyses, page <br /> 8, paragraph 4 of the I May 1988 sampling plan (page 16, paragraph 4 of the enclosed <br /> revised sampling plan) is amended as follows: <br /> Samples collected from beneath vaults 1, 5 and 6 will be analyzed for ethylene <br /> glycol by gas chromatography/flame ionization detection usin a "DB Wax" megabore-tvve <br /> chromatographic column. Since there are no existing Environmental Protection Agency <br /> EPA protocols fgr this analytic technioue. jhg analytic laboratory will provide thp. <br /> following verification information with the analytic results: <br /> 11 Descriptions of theas mole preparation and extraction procedures: <br />