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Eu <br /> " Project No. 034-98081 <br /> 11 Page No. 6 <br /> 4 <br /> required if regulatory site closure was to be requested. Krazan suggested this could be accomplished by <br /> U11 I <br /> collecting grab groundwater samples using Geoprobe® equipment from site perimeter locations. <br /> However, the San Joaquin County EHD has requested the installation of groundwater monitoring wells <br /> [3 <br /> ' to complete the assessment process (see Appendix A). <br /> I <br /> i <br /> 1 <br /> 6.0 SCOPE OF THE ASSESSMENT h <br /> Because the lateral limits of soil contamination were not totally defined during Krazan's work, it is <br /> a <br /> L� likely the County will also note this during their review of all reports. Therefore,;)Krazan is also <br /> proposing the collection of soil samples in the vicinity of,the UST during the proposed field <br /> investigation to complete soil characterizations at the subject site: <br /> I <br /> Based on the above-noted County directive and the above soil characterization discussion, Krazan will <br /> conduct the following scope of work, which represents a phased approach to site characterization: <br /> PHASE I <br /> .ii <br /> • Conduct sufficient research of nearby sites to gain a clear understanding historical and t <br /> i present groundwater flow direction and depth. ii <br /> i <br /> • Prepare this Workplan/Health and Safety Plan for submittal to and approval by, the <br /> SJCEHD. The workplan will include a screening phase during which grab <br /> groundwater samples will be collected to determine the distribution of contaminants in <br /> the upper aquifer, and a later well installat QII—phas, e�"Complete a sub-surface <br /> investigation permit and pay fees prior to initiation of work. <br /> • Advance two (2) Geoprobe® borings (one north and one south of the former UST <br /> �7 location) to complete lateral definition of soil contamination. Samples will be collected <br /> at depthsof 20_3p-a40 f t bgs from each boring. Samples will be analyzed for <br /> t _ BTEX/TPH-G. Grout es when completed. <br /> • Advance four (4) Geoprobe® borings to a depth of SO feet bgs to collect grab <br /> groundwater samples for the purpose of determining how petroleum hydrocarbons, <br /> known to exist in groundwater below the former UST area, are distributed down- <br /> gradient of this source. This information will be used to optimally position the <br /> permanent monitoring wells. <br /> PHASE II <br /> • Advance three (3) boreholes using a drilling rig equipped with hollow:stem auger, for <br /> the purpose of construction of groundwater monitoring wells. Collect one (1) soil <br /> KRAZAN&ASSOCIATES,INC. E <br /> Offices Serving the Western Unite!States 1 <br /> 3498081.WP <br />