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. Jerry Ltle Pege 3 <br /> February 2.2005 <br /> ADDITIONAL DOCUMENTATIONIDATA NEEDED <br /> 1. From the City of Stockton -Data detailing former, if available,and current <br /> underground utility corridors (primarily sewer and water)in the apartment area and <br /> in the undeveloped area as well. <br /> 2. The"Thorough underground utility saarch" results/report conducted/prepared prior to <br /> SECOR's January 9,2004 trenching, <br /> 3. A comprehensive map Identifying loeations-of ail samples. in partiailar,MW-1-213, <br /> MW-12-2A, MW13-2A, MW14-2A,and MW15-2A,are not depicted on the Bite map <br /> (Figure 1)in the HRA. <br /> 4.. Analytical data from the-undeveloped area which was found to contain many <br /> underground pipelines. <br /> 5. A map identifying location(s)of sheen andior non-aqueous phaae'liquid (NAPL) <br /> layer. <br /> 8. OVA results and boring logs,which presumably have notations for visual signs of <br /> contamination. <br /> -T. As previously requested in our February 5,2004 conference Call,identify whether <br /> • the soil sample results are repotted on a-wet weight or dry weight basis. For risk <br /> assessment purposes soll data are preferred on a dry weight basis: <br /> 8. Submit the quality assurance/quatity control (OAI=)reports and chain-ofcustody <br /> forms. <br /> 9. Define all qualifiers used in the data tables using footnotes;use standard data <br /> qualifiers ea deflned by U.S.EPA(U.S. EPA, 1989,1292] The results of soil vapor <br /> analyses do not define all the qualtfiere,such as-UJo'. Footnotes for soil VOCs do <br /> not define all the qualifiers,such as`J+4Ko". Footnotes for the Results of Son <br /> Analyses for Metals and Chemical Parameters do not define all the qualifiers, such <br /> 'as <br /> 10.The soil vapor data quallfier Jc used with vinyl Chloride states that the result was <br /> estimated due to a calibration Issue; submitInformation infoation as to whether vinyl chloride <br /> was above or below the standard curve as requested during our February 5, 2004 <br /> teleconference. <br /> i t.lnclude'dates of the last soil wetting episode (rein events and landscape irrigatlon) <br /> prior to soil gas samplfrig and prior to collection of soil for ske-specific geotechnical <br /> characteristics. <br /> 12.GROUNDWATER <br /> a. -identify and segregate groundwater analytical cherWstry data for the upper and <br /> lower portions of the aquifer. <br /> Sosawzar:.ax <br />