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Winston H. Hickox Secretary for Environmental Protection California Regional Water Quality Control Board Central Valley Region Robert Schneider, Chair Sacramento Main Office Internet Address: http://www.swrcb.ca.gov/rwqcb5 3443 Routier Road, Suite A, Sacramento, California 95827-3003 Phone (916) 255-3000 • FAX (916) 255-3015 'A EC V15- Gray Davis Governor 4 September 2003 Ms. Frances Schmiedt 20696 South Main Street Manteca, CA 9533 SEP 0 8 2003 ENVIRONMENT HEALTH PER REVIEW OF ADDENDUM LETTER, SCHMIEDT SOIL SERVICE, MANTECA, SAN JOAQUIN COUNTY We have reviewed the 18 August 2003 Addendum Letter Limited Soil and Groundwater Investigation (Letter) submitted by Kleinfelder on your behalf for the former Schmiedt Soil Service Incorporated property at 20696 South Main Street in Manteca (site). Although the Letter is dated 18 August, Regional Board staff did not receive it until 29 August. The Letter addresses comments sent to you by the Regional Board on 9 July 2003, on behalf of the Regional Board and the Department of Toxic Substances Control (DTSC). Regional Board and DTSC staff concur that the responses in the Letter are satisfactory. However, the Letter refers to sample results provided in the "City of Manteca, South Manteca DR." This reference information should be provided. Regional Board and DTSC staff will not request sampling for the additional 3.5 acres not covered by the proposed investigation based on the assertion in the Letter that no operations or releases occurred in this area. Furthermore, information is needed on the total depth of the sump on the eastern side of the concrete wash out pad to verify that a three-foot sample in this area is sufficient to determine whether a release occurred. Regional Board and DTSC staff suggest a sample collected directly below the sump, if possible. Lastly, the three proposed monitoring wells are not co-located to areas of potential concern. We understand that the purpose of these wells is to determine groundwater flow direction and gradient, but locations closer to areas of concern may be prudent if additional investigations are requested. By 12 December 2003, please submit an investigation report detailing field activities and sampling results and including field logs, sampling results from the "City of Manteca, South Manteca ER," and recommendations based on all sampling results. Information regarding the depth of the sump should be provided in the investigation report along with a discussion of how the samples collected were appropriate to evaluate whether a release occurred in the area or from the sump. The investigation report should be prepared in general accordance with the attached California Environmental Protection Agency C5 Recycled Paper The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. For a list of simple ways you can reduce demand and cut your energy costs, see our Web-site at http://www.swrcb.ca.gov/rwqcb5