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S E C O R DCA) was reported in six of the eleven monitoring wells at concentrations ranging from 0 94 ppb (MW-5) >, to 19 ppb (DMW-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 MtBE was reported in well WSW at a concentration 0 57 ppb all other analyes 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 northwest at 0 011 ft/ft and a local cone of depression toward MW-7 and MW-4 at 0 006 ft/ft, 0 003 ftlft, and 0 016 ft/ft The direction of groundwater flow within deep wells (DMW-1 through DMW-3) was to the northwest, at a gradient of 0 003 ft/ft Groundwater elevations in shallow monitoring wells MW-1 through MW-10 decreased by an average of 2 62ft, while groundwater elevations in deep monitoring wells DMW-1 through DMW-3 decreased by an average of 2 88 ft SECOR is performing granulated activated carbon treatment on well DWA 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 • Table 3--Groundwater Gradient Data • Table 4— Domestic Well Analytical Data • Table 5—Domestic Well Fuel Oxygenates and NitratelNitrite Analytical Data • Figure i —Shallow Groundwater Elevation Contour Map • Figure 2—Deep Groundwater Elevation Contour Map • Figure 3 —Groundwater Chemical Concentration Map • Attachment A—Field and Laboratory Procedures • Attachment B—Certified Laboratory Analytical Report, Cham-of-Custody Documentation, and Field Data Sheets cc Mr James Barton, Regional Water Quality Control Board -Central Valley Region (RWQCB-CVR) Ms Lori Duncan, SJCPHS Ms Madeline Scannavino, 5463 Cherokee Rd , Stockton, CA 95205 11ARC0105951QMRs1200413QMR04 doc