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Mr Harlin Knoll Environmental <br /> Resources <br /> Page 5 January 1999 Management <br /> Pa <br /> To aid in the evaluation of these remedial technologies, ERM proposes to <br /> collect soil samples for laboratory analysis of grain size and total organic <br /> carbon (TOC) The results of these samples will be used in the evaluation <br /> of the potential effectiveness of each remedial technology listed above <br /> One soil sample will be collected for analysis of grain size and TOC <br /> during the installation of HB-17 and HB-20 <br /> In addition to the samples described above, ERM proposes to perform <br /> slug testing in existing wells at the site The results of the slug tests will <br /> be used to deternune the permeability of the ground water aquifer in the <br /> vicinity of each former UST location This information will be used in the <br /> selection of an appropriate remedial strategy <br /> The slug tests will be performed in monitoring wells MW-4 and MW-6 <br /> These wells were selected because they are located within the area where <br /> the highest concentrations of benzene have been detected and therefore <br /> where remediation would occur These wells are also screened at the <br /> depth where the majority of impacted ground water at the site is located <br /> Therefore, any ground water remediation at the site would occur in this <br /> aquifer material <br /> ADDITIONAL ACTIVIITES <br /> In addition to the work described above, ERM will collect a round of <br /> ground water elevation measurements from the existing monitoring <br /> wells at the site These water elevation measurements will be collected <br /> during the advancement of soil borings at the site This information will <br /> be used in the ongoing investigation of the site <br /> SCHEDULE FOR PROPOSED WORK <br /> Upon approval, ERM will commence the proposed scope of work <br /> outlined above ERM anticipates that approval can be obtained from the <br /> County during the week of 25 January 1999 ERM expects that the soil <br /> sampling can be performed during the week of 8 February 1999 ERM <br /> plans to complete the evaluation of ground water remediation <br /> . technologies by the week of 22 February 1999 At this time, ERM will <br /> submit a work plan to the County and RWQCB describing proposed <br /> ground water remediation activities, if any, for the site <br />