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L A M B R I A Mr. Jeffrey Wong <br /> April 20, 2006 <br /> Monitoring Well Installation: Each boring will be drilled to approximately 10 feet below first- <br /> encountered groundwater. Based on the first quarter 2006 monitoring event, first-encountered <br /> groundwater beneath the site is approximately 33 to 35 feet below grade. The wells will be <br /> constructed using 4-inch diameter Schedule 40 PVC casing. The well screen interval will be <br /> from approximately 5 feet above to 10 feet below first-encountered groundwater. The sandpack <br /> in each well will be placed from the bottom of the well screen up to 2 feet above the top of the <br /> well screen, followed by a 2-foot thick bentonite seal and cement grout to grade. Actual well <br /> construction,details will be based on soil types and field conditions during drilling. Each well <br /> will be secured with a locking cap under a traffic-rated well box. <br /> © Well Development and Sampling: Blaine Tech Services, Inc. (Blaine) of San Jose, California <br /> will develop the new groundwater monitoring wells prior to sampling. After well development, <br /> Blaine will sample the site groundwater monitoring wells according to the existing sampling <br /> schedule and submit the samples to a State-of-California-certified laboratory for chemical <br /> analyses. <br /> Chemical Analyses: Selected soil samples and initial groundwater samples from wells MW-5 and <br /> MW-6 will be analyzed for TPHg, BTEX, fuel oxygenates, 1,2-dichloroethane, ethylene <br /> dibromide, PCE, and TCE by EPA Method 8260B. Groundwater samples from the existing wells <br /> i <br /> (MW-1 through MW-4)will be analyzed per the existing protocol. <br /> Wellhead Survey Activities: Following monitoring well installation, a licensed surveyor will <br /> survey wellhead elevations relative to mean sea level and the wells' latitude and longitude. <br /> Report Preparation: Following the receipt of analytical results from the laboratory, Cambria will <br /> prepare a written report, which will include field procedures,!laboratory results, boring logs, and <br /> conclusions. <br /> Cambria will perform the scope of work described in this work plan under the supervision of a <br /> professional geologist or engineer. <br /> SCHEDULE <br /> Cambria is prepared to begin work upon receiving SJCEHD's written approval of this work plan <br /> and an appropriate drilling permit. <br /> 4 <br /> J <br />