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S E C O R a f• • (1,2-DCA) was reported in six of the eleven monitoring wells at concentrations ranging from 0 85 ppb (MW-5) to 23 ppb (MW-3) MW-2 and MW-4 were not sampled because the wells were dry Additionally, domestic well WSW and well DW-2 were sampled for TPHg, BTEX, MtBE, and other fuel oxygenates/additives, all of which were reported as non-detectable above the laboratory method reporting limits The direction of groundwater flow within shallow wells (MW-1 through MW-10) was northeast to southeast, at a gradient ranging from 0 002 ft/ft to 0 004 fttft The direction of groundwater flow within deep wells (DMW-1 through DMW-3) was to the south, at a gradient of 0 001 ft/ft Groundwater elevations in shallow monitoring wells MW-1 through MW-10 increased by an average of 1 10 ft, while groundwater elevations in deep monitoring wells DMW-1 through DMW-3 increased by an average of 0 99 ft SECOR is performing granulated activated carbon treatment on well DW-1 Influent and effluent water samples are taken monthly and reported under separate cover in monthly performance summaries DW- 2 and the onsite water supply well (WSW) are incorporated into the quarterly monitoring and reporting Analytical data from DW-2 is included in Tables 4 and 5 Certified laboratory analytical data are included in Attachment B This report presents our understanding of existing conditions at the subject site The conclusions contained herein are based on the analytical results, and professional judgment in accordance with current standards of professional practice, no other warranty is expressed or implied SECOR assumes no responsibility for exploratory borings or data reported by other consultants or contractors ATTACHMENTS: Table 1 —Groundwater Elevation and Analytical Data Table 2—Fuel Oxygenates Analytical Data o Table 3-- Groundwater Gradient Data Table 4— Domestic Well Analytical Data o Table 5— Domestic Well Fuel Oxygenates and Nitrate/Nitrite Analytical Data Figure 1 — Shallow Groundwater Elevation Contour Map o Figure 2— Deep Groundwater Elevation Contour Map Figure 3—Groundwater Chemical Concentration Map Attachment A—Field and Laboratory Procedures a Attachment B—Certified Laboratory Analytical Report, Chain-of-Custody Documentation, and Field Data Sheets cc Mr James Barton, Regional Water Quality Control Board -Central Valley Region (RWQCB-CVR) Ms Lort Duncan, SJCPHS Ms Madeline Scannavino, 5463 Cherokee Rd , Stockton, CA 95205 1\ARC010595%QMRsti2004%2QMR04 doe