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August 22,2008 <br /> 4088087538 01 <br /> Mr. Jeff Wong <br /> San Joaquin County <br /> Page 2 <br /> prepare select soil samples for laboratory analysis based on PID measurements and physical <br /> characteristics identified by the field geologist. Two soil samples per boring location will be prepared <br /> and analyzed: one from just above first encountered groundwater,and one sample with the highest <br /> recorded PID reading. If all PID measurements are non-detect at a boring location, only the soil sample <br /> collected from just above first encountered groundwater will be prepared for analysis. Soil samples will <br /> be prepared by capping the tube ends with Teflon tape and plastic caps, labeling the samples with unique <br /> sample numbers, and placing the samples into a cooler with ice packs and the appropriate chain of <br /> custody(COC)documentation. <br /> Upon reaching the target depth in'each boring for which a groundwater sample is to be,collected, ; <br /> (estimated as 20 to 25 feet bgs);the drive rod will be-withdrawn approximately 3 feet.to allow water to: •. <br /> infiltrate the borehole,the disposable tip will be removed from the drive rod;and a,temporary polyvinyl <br /> chloride(PVC)well casing will be installed. A grab groundwater sample will be collected using a <br /> disposable Teflon,bailer or stainless steel bailer. The water will be decanted into the;appropriate sample <br /> containers,which will be provided.by.the analytical laboratory. The sealed sample containers will be <br /> labeledwith unique sample numbers and placed into,a cooler with ice packs with the-app ropriate COC. <br /> documentation. Samples will be analysed foutotal petroleum hydrocarbons(TPH)!as'gasoline(g)and; <br /> diesel(d)using EPA Test Method 8015M,and for benzene toluene, ethylbenzene,and total xylenes <br /> (BTEX)using EPA Test Method 8020M on a standard two-week turnaround basis. One composite soil <br /> sample will also be analyzed for leaking underground fuel tank(LUFT)metals for waste pro i mg <br /> purposes. q. <br /> Report <br /> Following completion of the field work and receipt and review of the sample analytical results,MACTEC <br /> will prepare a written letter report that summarizes our field observations and sampling procedures and <br /> the results of the chemical analyses. Our conclusionsand recommendations for additional work,if <br /> warranted,will also be included in this report. ' <br /> If you have any questions,please call Gary Lieberman at(707)793-3858 <br /> Yours very truly, <br /> I <br /> MACTEC Engineering& Consulting,Inc. <br /> Gary �ieberman CEM <br /> Project Manager <br /> i <br /> GAIAmlb:offsite workplan.doc-ProposalsN <br /> Attachments: Proposed Boring Location Map <br /> Boring Permit fff <br /> Encroachment Permit <br /> ' i <br />