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4 <br /> March 25, 1999 <br /> Work Plan for Subsurface Investigation Page 2 <br /> The Southland_Corporation,Store No. 17647,Manteca,California <br /> SOIL SAMPLING AND ANALYSIS <br /> Five soil borings will be installed in the vicinity of the former UST pit to'�a depth of 25 feet below ground surface i <br /> I - <br /> (BGS) using a direct push geoprobe (soil boring depth will be increased if groundwater is not encountered at <br /> 25 feet BGS). During the drilling, soil samplesw ill be collected at five foot intervals from surface to maximum <br /> borehole depth and logged using the Unified Soil Classification System by an IT Corporation field geologist, <br /> working under the supervision of a California registered geologist. Sol at each depth interval will be evaluated ) <br /> on site for relative hydrocarbon content using a field instrument. Samples collected for laboratory analysis will i <br /> be sealed with plastic caps over Teflon film,tapetl, labeled, placed onllice and sent to a state certified laboratory <br />'! under chain of custody. These will be analyzed for benzene, toluene;, ethylbenzene, total xylenes, MTBE and s <br /> total petroleum hydrocarbons as gasoline(TPH-g)following EPA method 802018015(modified). MTBE will.be <br /> i; <br /> confirmed using EPA method 8260. All sampling equipment will be cleaned.between sampling intervals using i <br /> detergent and rinsed with deionized water. Boreholes will be back filed to grade with bentonite. <br /> J i <br /> GROUNDWATER SAMPLING <br /> Groundwater is estimated to be 20 feet BGS at this site. Groundwater samples will be collected from each <br /> borehole, sealed, labeled, placed on ice and send to a state certified laboratory under chain of custody. These <br /> samples will be analyzed for BTEX, MTBE and TPH-g using EPA method 802018015(modified). MTBE will be <br /> confirmed using EPA method 8260. <br /> REPORTING AND REQUEST FOR CLOSURE <br /> IT Corporation will prepare a report summarizing the data collected under..the scope of work detailed above. <br /> The report will document the methods and results of the work, summarize laboratory analytical results and <br /> include appropriate maps. <br /> IT Corporation, on behalf of the Southland Corporation, will request site closure pending the outcome of the <br /> soil and water sample analytical results. If closure is not warranted, a work plan for the installation of <br /> monitoring wells and a quarterly monitoring and sampling plan will be submitted to the SJCEHD. <br /> I <br />