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2315 El Dorado, Stockton <br /> Page 2 <br /> various parameter chemicals (including MTBE). DIPE was detected in the <br /> groundwater samples taken in December 1997. <br /> The report contained quality control summaries of the analyses performed by Entech, <br /> Inc., but did not contain quality control (QC) summaries of the analyses performed by <br /> Sherwood Labs. QC results from Sherwood Labs were also not included in the <br /> previous quarterly monitoring report dated December 6, 1999. In a telephone <br /> conversation on February 10, 2000, Sherwood Labs expressed to this office that quality <br /> control results were not provided along with the analytical results to Geological <br /> Technics, Inc. Sherwood Labs agreed to submit the quality control results of the <br /> analyses of the samples from the latest'quarterly monitoring event to this office via <br /> facsimile. <br /> Provide the missing portion of the table in Appendix A to PHS/EHD by March 1, <br /> 2000. Include QC results of corresponding analyses in all future reports. <br /> The contamination plume in both groundwater and soil has not been defined vertically <br /> or laterally. PHS/EHD recommends further investigation to determine the vertical <br /> and lateral extent of the plume in both soil and groundwater. Loss of volatile and <br /> prevention of cross-contamination in both soil and groundwater samples must be <br /> controlled. Due to the depth of the contamination, PHS/EHD recommends <br /> providing soil physical characteristics such as permeability, dry bulk density, porosity, <br /> moisture, and organic carbon content in order to evaluate the potential vertical and <br /> lateral migration of the plume. PHS/EHD recommends employing the cone <br /> penetration test with simul-probe type technology for both sampling and soil <br /> classification. Submit a work plan to PHS/EHD by April 1, 2000. <br /> If you have any questions, please feel free to.contact Jeffrey Wong at (209) 468-0335. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> � G <br /> REHS Margare Lagorio, RE�S4effrey4ong, <br /> LOP/Site Mitigation Unit IV Supervisor <br /> c: RWQCB, Central Valley Region - Marty Hartzell <br /> c: Geological Technics, Inc. - Raynold I. Kablanow <br />