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0V4&TC <br /> • ASSOCIATES I NC , <br /> Groundwaterarameter <br /> p s of pH, temperature, clarity and conductivity were noted at <br /> approximately 5 minute intervals until successful stabilization occurred, or the wells went dry. <br /> Groundwater well development logs are contained in Attachment 1. <br /> CONCLUSIONS <br /> Concentrations of petroleum hydrocarbons detected in the groundwater samples collected from <br /> MW6a and MW7a indicate the hydrocarbon plume extends offsite in the shallow aquifer. <br /> Petroleum hydrocarbons detected in groundwater samples collected from MW6b, MW6c, <br /> MW7b, MW7c, and MW10b indicate the hydrocarbon plume extends offsite to the east in deeper <br /> groundwater. <br /> RECOMMENDATIONS <br /> Subsurface investigation activities, including the installation of off-site groundwater monitoring <br /> wells and interim remediation system installation activities will be detailed in a separate report. <br /> Based on the results of the second quarter 2004 monitoring episode, we recommend the <br /> following: <br /> Conduct the third quarter 2004 groundwater monitoring and sampling of wells MW1 <br /> through MW10c and EW1 and analyze the samples for TPHg, TPHd, BTEX MTBE, <br /> ETBE, DIPS, TBA, TAME, 1,2-DCA, and EDB. <br /> Please contact our office at(209) 579-2221 if you have any questions or comments. <br /> Respectfully submitted, <br /> ATC Associates 111c, <br /> Mike Luksic, R.G. "=�'"= <br /> Staff Geol gist : <br /> l <br /> Drew Van Allen <br /> Senior Project Manager <br /> A <br /> - <br /> - <br /> CA Registered Civil Engineer No. 47410 otr y` <br /> attachments <br /> S A268231QM reports12004 2QR.doc 4 <br />