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water was stored onsite in labeled, closed top 55-gallon steel drums. The City will then appropriately dispose the purge water. Groundwater measurements collected on September 9, 2010 from well MWWES-1 and the existing CH2M Hill wells (see Table 1). The plot indicates a northwest groundwater flow direction at a calculated gradient of about 0.0014 at the new well vicinity. A small groundwater mound might be present in the vicinity of MWWES-1 located near two impoundments. The amount of seepage from the impoundments and the possible effect on local groundwater levels are not known. Table 1. Monitoring Well Groundwater Measurement Data Monitoring Date of Well Well Depth to Top of Well Groundwater Comments Well Water Level Depth Diameter Ground Casing Elevation Number Measurement (ft) (inches) Water in feet Elevation in in feet feet MWWES-1 10/22/09 24.49 2 8.97 19.34 10.37 None 9/9/10 8.87 10.47 MWHP-5# 10/22/09 40.88 4 15.48 25.97 10.49 None 9/9/10 14.28 11.69 MWHP-6# 10/22/09 36.51 4 12.17 20.95 8.78 None 9/9/10 11.80 9.15 MWHP-7# 10/22/09 32.15 4 9.79 18.31 8.52 None 9/9/10 9.18 9.13 MWHP-8# 10/22/09 26.40 4 10.10 19.07__j 8.97 None 9/9/10 9.42 9.65 # - Existing CH2M Hill Monitoring Well Number. Well Casing elevation to NGVD in feet surveyed by City of Tracy. 6.0 Groundwater Chemical Analysis and Discussion One (1) groundwater sample was analyzed at Kiff Analytical LLC, a State-certified analytical laboratory in Davis, California. The sample was tested for the following: Total Petroleum hydrocarbons as Gasoline (TPHG) and Diesel (TPHD), Benzene (B), Toluene (T), Ethylbenzene (E), Xylene (X) using EPA Methods 3510/8015, 8020 and 8260/8260B. The analyses was performed and a "normal" five to ten-day turnaround. The results are presented in Table 2 below and the analytical reports are attached. The chemical analysis showed that TPHD, TPHG and BTEX were not detected in MWWES-1. Page 3 of 7