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CHAPTER 4 <br /> FIELD AND ANALYTICAL RESULTS <br /> Tlris chapter presents the field and analytical results of the Geweke Land Development and <br /> Marketing (GLDM) property at 16 South Cherokee Lane, Lodi, California. The soil and <br /> groundwater samples collected daring this investigation were analyzed at Brown and Caldwell.. <br /> Analytical Laboratory,in Emeryville,California(certified by the California Department of Health <br /> Services). <br /> 9 <br /> i.. <br /> Soil Results <br /> x• <br /> .r <br /> i <br /> { <br /> The soil samples collected from MW-7 and MW-8 (six samples) daring this investigation <br /> were inadvertently held 2 to 4 days beyond the recommended holding time of 14 days prior to <br /> analysis by the laboratory. The samples were submitted to the laboratory within two days of <br /> collection, therefore the holding time expired when the samples were in a c.ntrolied laboratory <br /> 4 � <br /> environment. The recommended holding time for this type of analysis is 14 days according to <br /> the Environmental Protection Agency (EPA) Manual No. SW-846 and Part 40, Code of Federal <br /> Regulations, Section 136.3. As a result of this, the data presented in this section for these soil <br /> .amples will only be used as a qualitative indicator for the presence of hydrocarbons. <br /> Soil samples collected from the boreholes were screened in the field for organic vapors <br /> using a photo ionization detector (PID). Table 4-1 presents organic vapor field readings <br /> according to d:e depth of the sample. The samples were placed in a plastic resealable bag and <br /> allowed to volatilize into the remaining headspace in the bag. The PID was used to measure <br /> organic vapors in the headspace of the plastic bag. <br /> i <br /> t <br />