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— + sc a2s rn P. 64 <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> November 4, 1999 <br /> Page 3 <br /> Subsurface soils will be sampled at approximately five-foot intervals starting at five feet in depth. <br /> After the sample and core barrel is raised to the surface,each sample was collected as follows: (1) <br /> The filled acetate tube will be exposed for visual examination; (2)The selected sampling interval <br /> will be collected by cutting the sample and acetate plastic tubing to the desired length (typically <br /> about six inches);(3)The ends of the selected sample will be quickly wrapped with Teflon sheets <br /> or aluminum fail,capped with plastic end caps,labeled and wrapped tightly with tape;and.(4)The <br /> sealed soil sample will be labeled and immediately placed in cold storage for transport to the <br /> analytical laboratory under formal chain-of-custody. All coring and sampling equipment will be <br /> thoroughly cleaned and decontaminated between each sample collection by triple rinsing first with <br /> water, then with dilute tri-sodium phosphate solution, and finally with distilled water. Owning <br /> rinseate will be contained onsite in a.scaled'SS gallon drum pending laboratory results. <br /> Following completion of soil sampling activities, 314 inch.diameter Schedule 40 PVC well casing <br /> will be placed in each boring, and grab groundwater samples will be collected from each boring <br /> using a clean small-diameter stainless steel bailer. Each grab groundwater sample will be collected 1 <br /> as follows: (1)Four 44-m1 glass VOA vials will be completely filled directly from the baiter with <br /> a minimum of agitation; (2)After making sure that no air bubbles are present,each container will <br /> then be tightly sealed with a Teflon-lined septum;and(3)Each container will then be labeled and <br /> placed in cold storage for transport to the analytical laboratory under formal chain-of-custody. All <br /> sampling equipment will be thoroughly cleaned and decantamina,ted between each sample collection <br /> by triple ringing as deseribcd above. <br /> Laboratory Analysis ofSail and Waver Samples <br /> Approximately six soil samples and two grab groundwater samples will be analyzed for the <br /> following parameters: <br /> USEPA 8015M Total Petroleum Hydrocarbons as Diesel (TPIi-G) 4 <br /> USEPA 8020/60213enzene,Toluene,Ethylbenzene,Xylenes(BTEX) 1 <br /> USEPA 90201602 Methyl-t-butyl Ether(MTBE) <br /> All analyses will be conducted by a State-certified analytical laboratory with two-week turnaround <br /> on results. <br /> Preparation o,f Summary Report <br /> A;report summarizing investigative methods and results will be prepared for submittal to San <br /> Joaquin County Public Health Services. This report will describe all investigative methods and <br /> results-, and will include tabulated laboratory results. <br /> i <br /> _ I <br /> GRISI'Assoclates i <br /> If(4 <br /> I <br />