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1 <br /> ATC Associates Inc. <br /> (: <br /> VYATC <br /> 1117 Lone Palm Avenue, Suite B <br /> Modesto, California 95351209-579-2221 <br /> n s s 0 c l n r e.s .Ir cc fax: 209-579-2225 <br /> Once the monitoring wells are installed, the tops of the well casings will be surveyed to sub- <br /> meter accuracy relative to a known benchmark by a State of California licensed land surveyor. <br /> At least 48 hours after installation, the four new wells will be developed using surging and <br /> bailing techniques until the purged groundwater is relatively sediment free. The wells will be <br /> sampled at least 48 hours after they are developed. Prior to the collection of groundwater <br /> samples, the depth to groundwater will be measured in each well to evaluate the direction and <br /> magnitude of the groundwater gradient beneath the site and a minimum of three well volumes <br /> (casing and sand pack) of groundwater will be purged from each well. Temperature, pH, and <br /> electric conductivity will be measured and allowed to stabilize. Water samples will be collected <br /> using disposable bailers, one dedicated to each well. <br /> Sample Analyses <br /> Groundwater samples collected from the monitoring wells will be submitted under chain-of- i <br /> custody procedures to a State-certified laboratory and analyzed for TPHg, BTEX, MTBE, ETBE, <br /> DIPE,TBA, TAME, 1,2-DCA, and EDB utilizing EPA Method 8260B. <br /> Report Preparation <br /> i <br /> Upon completion of the investigative activities, a summary report will be prepared for submittal' <br /> to the EHD and Regional Water Quality Control Board. The report will include a description of <br /> field activities, laboratory analytical results, and well/boring logs. <br /> The work described in this workplan will be performed under the direction of a California <br /> Registered Professional Engineer or Geologist and will be conducted in accordance with ATC's <br /> Site Safety Plan (SSP) and Quality Control/Quality Assurance Plan already on file with <br /> PHS/EHD for this site. <br /> Projected Schedule <br /> Once approval of this workplan has been received, ATC will confirm a schedule for drilling <br /> activities. ATC will notify EHD at least 48 hours prior to beginning any field activities. The f <br /> summary report will be submitted to EHD approximately four to five weeks after the completion <br /> of field activities. I <br /> sA22493\reports\Wkp1n_we11 inst2006.doc 5 <br /> IG <br /> t <br /> I <br />