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k <br />Ms. Frances Schmiedt <br />1 June 2004 <br />evaluation. Detection limits for all analyses (including those where constituents were non-detect) <br />should be reviewed to ensure that they are appropriate for evaluating the risk and hazard posed <br />by constituents. Tables summarizing the risk and hazard calculations for constituents should also <br />be provided in an appendix and summarized in the report. <br />Based on the results for the shallow soil samples, additional samples should be analyzed from <br />deeper depths at locations where pesticides and possibly other constituents were detected to <br />determine if concentrations increase or decrease with depth. Additional lateral samples may also <br />be appropriate for certain areas based on an evaluation of the data and the location of other <br />samples with respect to the location where pesticides or other constituents were detected. <br />The tables in the Tables Section of the Report do not list the detection limits for non-detect <br />samples. In subsequent reports, non-detect analytical data need to be presented as less than the <br />detection limit, as was done for the tables within the text of the Report. Furthermore, the page <br />numbering of the tables in the Report is confusing. It appears that not all of the pages of the <br />tables are included in the Report. Tables need to be in a large enough font so that the data is <br />easily readable and the page numbers clearly identified. <br />Plate 1 in Appendix F appears to have been copied as an 8.5 x 11.0 inch page that was folded <br />rather than an 11x17 inch page, resulting in the loss of the GPR investigation information on the <br />diagram. A replacement page is needed. <br />Attached is a table listing the designated levels for constituents in soil and cleanup goals for <br />groundwater. Based on the detections in soil and groundwater, there are several constituents that exceed <br />the designated level for soil and/or the cleanup goal for groundwater. Based on the results of the <br />investigation and the above comments, additional investigative work is needed at the site. Because the <br />monitoring wells were only sampled once, Regional Board and DISC request four consecutive quarters <br />of sampling data from the monitoring wells in addition to the delineation and excavation activities. By <br />23 July 2004, please submit a work plan proposing delineation, excavation, and monitoring well <br />sampling activities. If you have any questions, you may contact me at (916) 464-4719 or by email at <br />lewisd@rb5s.swrcb.ca.gov. <br />AAA_ .4_,au-L,0 <br />DEVRA LEWIS <br />Environmental Scientist <br />Attachment <br />cc: Mr. Steve Becker, Department of Toxic Substances Control, Sacramento <br />San Joaquin County Environmental Health Department, Stockton <br />Mr. Joe Wells, City of Manteca Public Works, Manteca <br />Mr. Rod Attebury, Esq., Neumiller & Beardslee, Stockton <br />Mr. Joseph Zelles, Kleinfelder, Stockton