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S E C 0 R Mr Harlan Knoll April 14, 2003 Page 3 casing If the hollow stem auger is used, conductor casing will be installed to a depth that will be determined in the field After the completion of the soil boring, it will be converted Into a 2-inch monitoring well screened from 100 to 110 feet bgs The screen interval will be adjusted in the field to ensure that the well screen interval will correspond with the interval to have significant hydrologic conductivity Sentry Well Installation The sentry well will be drilled at the location shown on Figure 2 The soil boring will be drilled either an 8-inch and 12-inch diameter hollow-stem auger or air rotary drill rig with hammer casing to a total depth of approximately 110 feet bgs If the hollow stem auger is used, conductor casing will be installed to a depth that will be determined in the field After the completion of the soil boring, it will be converted into a 2-inch monitoring well screened from 100 to 110 feet bgs The screen interval will be adjusted in the field to ensure that the well screen interval will correspond with the interval to have significant hydrologic conductivity Sample Selection and Analysis Soil samples will be collected at 5-foot intervals and selected samples will be sent under chain-of-custody procedures to a California State-certified laboratory Samples will be analyzed for TPHg, benzene, toluene, ethylbenzene, xylenes (BTEX compounds), and MtBE using EPA Method 8260 single run . Monitoring Well Development and Sampling After installation, the wells will be developed by rigorously surging the wells over the length of the screen interval and by purging approximately 10 casing volumes of water After well development, groundwater samples will be collected from the newly installed well and sent under standard chain-of-custody procedures to a California State- certified laboratory The groundwater samples will be analyzed for the following TPHg, BTEX, fuel oxygenates (MtBE, DIPE, TAME, EtBE, TBA, and ethanol), and lead scavengers (1,2-DCE and EDB) using EPA Method 8260 Report A report will be prepared after completion of necessary fieldwork The report will include , soil boring logs, soil and groundwater analytical results, chain-of-custody documentation, and conclusions Field and laboratory procedures are presented as Attachment B d SCHEDULE SECOR is prepared to initiate fieldwork within four to six weeks following approval of this work plan and issuance of permits by the San Joaquin County Environmental Health Department and the City of Stockton Public Works Department A report documenting the findings of this assessment Is anticipated to be submitted approximately six to eight weeks after the completion of the fieldwork and receipt of laboratory results Once the work is completed, an additional work plan to conduct feasibility testing will be submitted the San Joaquin County Environmental Health Department C i WPLAN sentry well install SECOR tntemahonal Incorporated