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f Chevron Products Company � UPage 4 <br /> Chevron Station#9-1452 334 East Main Street Ripon,California October Z9 2001 <br /> F <br /> 4 � <br /> below first encountered groundwater in the shallow wells and approximately 5 <br /> feet.of screen will be placed in the bottom of the deep borings. <br /> M1 • Permitting. The applicable permits will be obtained from the SJPHS prior to <br /> drilling.' <br /> + Monitoring Well Development and Sampling. Following installation, the <br /> monitoring wells will be developed by rigorously surging the wells over the <br /> length of the screen interval and by purging approximately 10 casing volumes of <br /> water. After well development, groundwater samples will be collected for <br /> chemical analysis. <br /> + Soil and Groundwater Analysis. Selected soil and groundwater samples will <br /> { be sent under chain-of-custody procedures to a California State-certified <br /> laboratory for analysis of TPHg and methanol using modified EPA Method <br /> 8015, BTEX and the fuel oxygenates MtBE, EtBE, DIPE, TAME, EDB, TBA, <br /> 1-2 DCA, and ethanol by EPA Method 8260. <br /> • Well Surveying and Groundwater Gradient Interpretation. A state licensed <br /> surveyor will survey the newly installed wells. Depth to groundwater <br /> measurements will be collected during sampling activities and utilized for <br /> interpretation of groundwater flow and gradient beneath the site. <br /> • Slug Tests. Slug tests will be performed in at least three monitoring wells to ' <br /> derive values for transmissivity(T) and hydraulic conductivity (K). <br /> • Report. A report will be prepared after completion of necessary field work. <br /> The report will include soil boring logs, soil and groundwater analytical results, <br /> chain-of-custody documentation, groundwater gradient map, and conclusions. <br /> SCHEDULE <br /> SECOR is prepared to initiate fieldwork within 4 weeks following approval of this work <br /> plan by the SJPHS. A report documenting the findings of the well installation and <br /> possible CPT borings is anticipated to be submitted approximately 8 to 10 weeks after <br /> the completion of the field work and upon receipt of all analytical data. <br /> SINCERELY, <br /> SECOR INTERNATIONAL INCORPORATED <br /> Brian Silva William E. Brasher, P.E. <br /> Staff Scientist Project Manager <br /> i <br /> I:1Chevron1914521REP0RTS12001 Geoprobe'SA&well wp_Rev B.doc <br /> r <br /> l <br />