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III RUN-IIIM <br /> Mr. Roy Knight <br /> 13 November 1997 <br /> Page 3 <br /> samples were collected, the soil borings were backfilled with a cement grout in compliance with <br /> San Joaquin County regulations. For the soil borings drilled within the drain inlets, a tremmie <br /> pipe was used to backfill each boring. <br /> A mobile laboratory was brought to the site for conducting laboratory analyses. The liners that <br /> were submitted to the mobile laboratory for analysis were sealed with Teflon sheets secured by <br /> plastic caps. Excelchem Environmental Labs of Roseville, a state certified laboratory, supplied <br /> the mobile laboratory. The liners were labeled to indicate a unique sample number, the date and <br /> time collected, sample locations, and the sampler's identification. Soil samples were described <br /> using the Unified Soil Classification System and selected samples were screened in the field for <br /> the presence of organic vapors. Rinse water and excess soil was stored in drums at the site for <br /> subsequent disposal. <br /> Samples were also screened in the field for the presence of hydrocarbons by monitoring the <br /> headspace of sealed plastic bags containing soil samples for the presence of organic vapors. <br /> Organic vapors were measured by a photo-ionization detector equipped with an 10 eV bulb. <br /> Results of the headspace monitoring and the visual inspection are noted on attached soil boring <br /> logs. <br /> Prior to conducting any drilling, liquid that was present in the drain inlets was removed and <br /> transferred into 55-gallon drums for disposal at a facility permitted for this waste. Soil and water <br /> samples were collected from the two drums located at the site to profile the waste for disposal <br /> purposes. <br /> Laboratory Analyses <br /> One sample was selected from each soil boring to evaluate concentrations of hydrocarbons that <br /> may be present and estimate the extent of excavation that will be necessary to remove the <br /> contaminated material. The original work plan proposed the submittal of two samples from each <br /> boring for laboratory analyses. Due to the shallow depth of each boring, the work plan was <br /> modified to reflect the analysis of one sample from each boring as stated in the Addendum to <br /> Work Plan for Investigation of Storm Drain Inlets dated 4 November 1997 that was submitted to <br /> the San Joaquin County for their concurrence. Field screening of core samples drilling did not <br /> indicate that more than one sample per boring was warranted. <br /> Soil samples were analyzed for the following constituents: <br />