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i <br /> RE: 3250 W. Hammer Lane in c�--.)ckton Page 2 of 2 <br /> David, <br /> In response to your telephone call on January 22,2003,I did review the <br /> Additional Assessment and Interim Remediation Report submitted by Shaw <br /> Environmental and Infrastructure,Inc. on November 8,2002 for the site at <br /> West Hammer Lane in Stockton.After reviewing report and data,I am the <br /> 3250 es P <br /> not certain that the vertical and lateral extents of soil and groundwater <br /> contamination have been defined for this site. Can you please tell me if a <br /> site conceptual model has been submitted for this location? Will you please <br /> check the methods used to analyze the soil-vapor samples? The methods <br /> listed on page 6 of the report are EPA Method'8020 for BTEX,and EPA Method <br /> 8260B for the five oxygenates. These are not methods for air samples r <br /> While reviewing the report I found the following corrections: <br /> * Change the TAME soil results to a range of 0.005 to 0.042 mg/kg from <br /> well borings MW-4 and MW-5. The range was reported as 0.66 to 4.5 mg/kg on <br /> page 7. <br /> * The groundwater samples were collected from MW-4 and MW-5 on July <br /> 29,2002,not July 23,2002,as indicated on page 7. <br /> * The results for MTBE,TAME,and TBA are reversed between the sample <br /> IDs System Effluent and Tank in Table 3. " <br /> * The sample identification for the last sample in Table 4 is MW-1-H, ` <br /> not MW-1-F. - <br /> I also reviewed the report for the fourth quarter 2002 groundwater <br /> monitoring event. This report is missing Table 1,Figure 1,and Figuie 2. <br /> Please provide this information. <br /> 9' <br /> Lastly,data have not been submitted to GeoTracker since the first quarter <br /> groundwater monitoring event for 2002. The data must be entered into <br /> GeoTracker as soon as possible. <br /> I plan to review previous reports and data and discuss this site with Nuel <br /> Henderson,Registered Geologist,in our office. At that time I may need <br /> additional information before considering a Corrective Action Plan. <br /> Please let me know when I will receive the requested information and do not <br /> hesitate to call me at the number listed below if you have any questions. <br /> Vicki McCartney,EHS <br /> 304 E.Weber Avenue <br /> Stockton,CA 95202-2708 <br /> Phone(209)468-3456 <br /> Fax (209)468-3433 <br /> vmccaftney@sjcehd.com <br /> 1/29/2003 <br />