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Ms. Margaret Lagorio <br /> May 22, 1998 <br /> Page 2 <br /> appropriate to the selected analyses. If insufficient water is produced using the Hydropunch, <br /> then the Hydropunch device will be removed and temporary PVC well screen and casing will <br /> be place downhole to facilitate collection of a groundwater sample. <br /> • Following collection of each groundwater sample, each boring will be grouted to the surface <br /> using a cement/5% bentonite slurry under the supervision of a San Joaquin County inspector. <br /> New disposable sample collection materials (PVC well screen and casing, sample tubing, etc.) will <br /> be used at each boring, and all re-usable equipment (e.g. Geoprobe rod and Hydropunch) will be <br /> decontaminated between each boring using a Liquinox/water solution. <br /> LABORATORY ANALYSIS <br /> The groundwater samples will be appropriately labeled and packaged in a thermally insulated ice <br /> chest and hand delivered under chain-of-custody protocol to CLS Laboratories of Rancho Cordova, <br /> California for analysis (CA DOHS ELAP x/1233). The groundwater samples will be analyzed for <br /> total petroleum hydrocarbons in the gasoline (TPH-g) and diesel (TPH-d) ranges by EPA Method <br /> 8015M and benzene, toluene, ethyl benzene, total xylenes (BTEX) and MTBE by EPA Method <br /> 8020. Should MTBE be detected by EPA Method 8020, McLaren/Hart will recommend our client <br /> confirm the MTBE result by EPA Method 8260. Samples will be analyzed on a one-week turn <br /> around time. <br /> REPORTING <br /> Upon reviewing the analytical data, McLaren/Hart will forward one copy of the analytical data <br /> sheets to San Joaquin County Environmental Health as required by the drilling permit conditions. <br /> CLOSURE <br /> If you have any questions concerning this work plan, please call me at 916-851-1258. <br /> Since;ely, <br /> Keith Hoofard <br /> Senior Associate Geoscientist <br /> Attachments <br /> cc: Mr. Doug Mull, Lewis Homes Management Corporation <br /> ® fjqg!If wen aI sm <br />