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EPOR. r I Mr James L Barton April 12, 2005 Page 2 I Groundwater measurements recorded on January 10, 2005 from wells screened in Unit A were used to construct the groundwater elevation contour map included as Figure 3 The groundwater flow direction for Unit A was generally to the east southeast, with a hydraulic gradient of approximately 0 013 feet per foot (ft/ft) Groundwater measurements recorded on January 10, 2005 from wells screened in Unit B were used to construct the groundwater elevation contour map included as Figure 4 The groundwater flow direction for Unit B was generally to the east southeast, with a hydraulic gradient ranging from ' approximately 0 003 fttft to 0 008 ft/ft Groundwater measurements recorded on January 10, 2005 from wells screened in Unit C were I used to construct the groundwater elevation contour map included as Figure 5 The groundwater flow direction for Unit C was generally to the east, with a hydraulic gradient of approximately 0 002 ft/ft iGroundwater measurements recorded on January 10, 2005 from wells screened in Unit D were used to construct the groundwater elevation contour map included as Figure 6 The groundwater I flow direction for Unit D was generally to the southeast, with a hydraulic gradient of approximately 0 003 ft/ft Copies of the groundwater sampling information sheets are included as Attachment B Tabulated results of recent depth to water (DTVII) measurements are presented in Table 1 Groundwater elevations measured to date are presented in Table 2. A table of well construction details is included as Attachment C Groundwater Sampling and Analytical Results Groundwater samples were collected on January 11 through 17, 2005 Groundwater samples were submitted to California Laboratory Services (CLS) to Rancho Cordova, California, for analyses of total petroleum hydrocarbons as gasoline (TPHg) by EPA Method 8015 Modified, and for volatile organic compounds (VOCs) by EPA Method 8260B Recent groundwater sampling analytical results are presented in Table 1 Cumulative groundwater sampling analytical results are presented in Table 3 Maps depicting dissolved concentrations of TPHg and benzene in groundwater are included as Figure 7 through Figure 14 Laboratory analytical results with Cham-of-rustody documentation are included in Attachment D Site Conceptual Model Update In a letter dated February 8, 2002, the RWQCB requested completion of an updated SCM for this site The initial SCM was submitted to the RWQCB to an Environmental Audit Incorporated (EAI) report titled "Supplemental Investigation Report, Problem Assessment Report, and Work Plan, Cleanup and Abatement Order No 5-00.707, Montgomery Ward Auto Service Center and J lProjeUs1D694015098-2931workinglReports15098 1 st Qtr 05-QMR doc Celeoraring 35 Years of Excellence ii environmental Seaoces