SITE INFORMATION AND CORRESPONDENCE

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Mr. Eric J. Holm March 26, 1997 Page 8 plumes beneath the Site. 4. Holz has a history of using solvents including acetone, MEK, and MIK. Therefore, DTSC requires that soil gas samples be analyzed for acetone, MEK, and MIK, in addition to other VOCs and BTEX. Please notify your soil gas contractor to include analysis for these specified compounds for samples collected, and report any other chemicals detected. 5. Soil samples should be collected for analysis of metals of concern(metals detected in BEM sampling), semi-VOCs, phenolic compounds, and TPH. Additionally, representative soil samples should be analyzed for moisture content, organic contents, bulk density, and porosity to determine the soil characterization beneath the Site. The soil characterization data are to assist the development of site-specific cleanup levels for the Site. 6. DTSC is also requiring the following additional information be provided prior to the site visit: (a) Copies of the wastewater sampling results for the wastewater discharged into the City's sanitary and industrial sewer lines be provided prior to field sampling; (b) Soil boring logs collected by BEM; and (c) A map showing sewer lines and floor drains connecting to the City's sanitary and industrial sewer lines, as well as chemical pipelines located at the Site. In response to Holz's request for the earliest sampling as possible, DTSC would like to arrange the site visit with you or your staff as soon as possible to refine the soil gas sampling locations. Submittal of an addendum to incorporate the above comments including the finalized soil gas sampling locations will be adequate. The addendum should be submitted within 15 days, or earlier, upon completion of the field visit. Please note that soil gas sampling locations may subject to further changes based on field sampling results. Please coordinate with DTSC on field sampling dates and notify DTSC five (5)days in advance of the field sampling date.