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Mr. Daniel Decker • - 2 - • 4 June 2001 <br /> 6. The Report does not include information on the two on-site water supply wells. The Report <br /> should discuss information such as the total depth, well screen, and sampling date(s) to determine <br /> if additional sampling is warranted. <br /> 7. Table 1 does not list total xylene detections, and Table 3 does not list toluene, bromoform, 1,2,3- <br /> trichloropropane, trichlorofluoromethane, dibromochloromethane, and 1,2-dichloroethane <br /> detections. In addition, the Report does not discuss the detections of most of these chemicals. <br /> CGCI must discuss all pollutants encountered during investigative and monitoring activities. <br /> 8. Equipment blank samples should be collected from reusable soil and groundwater sampling <br /> equipment to determine whether proper decontamination is occurring between samples and to <br /> evaluate the potential for cross-contamination. <br /> 9. The field parameter forms list depth to water measurements taken before and after purging. <br /> Several of the monitoring wells show an increase in water column after purging has been <br /> completed. The Report needs to provide an explanation for this. <br /> By 26 June 2001, please submit a response to these comments, and a work plan and time schedule to <br /> delineate the lateral and vertical extent of groundwater contamination. The interim remedial action plan <br /> for soil and groundwater cleanup is still due by 29 June 2001. Joe Mello has left the Regional Board, <br /> and I am the new project manager for this site. If you have any questions you may contact me at <br /> (916) 255-3119 or by email at lewisdarb5s.swrcb.ca.gov. <br /> ��JL>✓(.Ct �.�,L(�-GEJ <br /> DEVRA LEWIS <br /> Environmental Specialist H <br /> cc: Mr. Jeff Wong, San Joaquin County Health Department, Stockton <br /> Ms. Linda Huff, Huff&Huff, LaGrange, Illinois <br /> Mr. Joe Weidmann, Haley& Aldrich, Inc., San Diego <br />