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EMIL Mr James L Barton October 29, 2004 Page 2 Groundwater measurements recorded on July 12, 2004 from wells screened to 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 northeast, with a hydraulic gradient of approximately 0 002 feet per foot (ft/ft) ' Groundwater measurements recorded on July 12, 2004 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, with a hydraulic gradient of approximately 0 006 ft/ft Groundwater measurements recorded on July 12, 2004 from wells screened to Unit D were used to construct the groundwater elevation contour map included as Figure 5 The groundwater flow ' direction for Unit D was generally to the northeast, with a hydraulic gradient of approximately 0 0002 ft/ft ' Copies of the groundwater sampling information sheets are included as Attachment B Tabular results of recent depth to water (DTW) measurements are summarized in Table 1 A tabular summary of well construction details is included as Attachment C ' Groundwater Sampling and Analytical Results Groundwater samples were collected on July 14 through July 22, 2004 Groundwater samples were submitted to California Laboratory Services (CLS) in Rancho Cordova, California, for analyses of total petroleum hydrocarbons as gasoline (TPHg) by EPA Method 8015 Modified, and volatile organic compounds (VOCs) by EPA Method 8260B Tabular results of recent ' groundwater sampling analytical results are summarized in Table 1 A summary of groundwater elevations measured to date is presented in Table 2. Cumulative groundwater sampling analytical results are summarized to Table 3 Maps depicting dissolved ' concentrations of TPHg and benzene in groundwater are included as Figure 6 through Figure 13 Laboratory analytical results with chain-of-custody documentation are included in ' Attachment D Site Conceptual Modell 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 in 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 OS Former uriocar Site, 05400 a;rd SSPac+bc Avenue, Stnrktnn, C:alrfnrnra " dated October 13, 2000 ' Site stratigraphy is segregated into four hydro-stratigraphic units that generally correspond to screened intervals of site wells The shallowest wells are screened in the hydro-stratigraphic unit designated as Unit A and the deepest wells are screened across hydro-stratigraphic Unit D A cross-section location map, cross section A-A', cross section B-B', and cross section C-C' are IlDcsacramentolprojeclsTrojectsko6940M98 293TinaWeportslQuartedy Momtonng Reports15098 3rd Qtr D4-QMR doc �?1BC13'lr1C�^ YPc�r' ' XCP! rCr^ In E"? 1r0r merlra7 SP I