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. I <br /> in monitoring well MW-4 at concentrations of 301 ppb,2 25 ppb, and 2 07 ppb, respectively 1,2- Dichloroethane <br /> (1,2-DCA) was reported in three of the four monitoring wells sampled this quarter at concentrations ranging from <br /> 28 3 ppb(MW-2) to 240 ppb (MW-4) Additionally,the onsite domestic water supply well (WSW) was sampled for <br /> TPHg,BTEX,MtBE,and oxygenates, all of which were reported below laboratory detection limits Groundwater <br /> flow direction was to the west-northwest at an approximate gradient of 0 0004 ft/ft Groundwater elevations <br /> increased an average of 0 1 feet this quarter <br /> This report presents our understanding of existing conditions at the subject site The conclusions contained herein <br /> are based on the analytical results and professional judgment, which are in accordance with current standards of <br /> professional practice,no other warranty is expressed or implied SECOR assumes no responsibility for exploratory <br /> borings or data reported by other consultants or contractors <br /> ATTACHMENTS: <br /> • Table 1 -Groundwater Elevation and Analytical Data <br /> • Table 2-Historical Groundwater Gradient Data <br /> • Table 3 -Oxygenates by EPA Method 8260 <br /> • Figure 1 -Groundwater Elevation Contour Map <br /> • Figure 2 -Groundwater Concentration Map <br /> • Attachment A-Field and Laboratory Procedures <br /> • Attachment B -Certified Laboratory Analytical Reports,Cham-of-Custody Documentation,and Field <br /> Data Sheets <br /> cc Mr Marty Hartzell,Regional Water Quality Control Board <br /> Ms Lori Duncan,San Joaquin County Environmental Health Services <br /> Ms Madeline Scannavino,5463 Cherokee Road,Stockton,CA 95205 <br />