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ry•I S E C O R ranging from 1 2 ppb (MW-5) to 21 ppb (DMW-3) MW-2 and MW-4 were not sampled because the wells were dry Due to a car parked over well MW-9, the well was not accessible for sampling 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 west, at a gradient ranging from 0 0001 ft/ft to 0 001 ft/ft The direction of groundwater flow within deep wells (DMW-1 through DMW-3) was to the southwest, at a gradient of 0 001 fUft 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 Table 3—Groundwater Gradient Data • Table 4— Domestic Well Analytical Data • Table 5—Domestic Well Fuel Oxygenates and Nitrate/Nitrite Analytical Data • Figure 1 —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, Chain-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 • 11ARC 0105951QMRs1200411 QMR04 doc