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California Regional Water Quality Control Board <br /> Central Valley Region J <br /> Robert Schneider,Chair <br /> Terry Tamminen Arnold Schwarzenegger <br /> Secretary for Sacramento Main Office Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/rwgcb5 <br /> Protection 11020 Sun Center Drive#200 Rancho Cordova,CA 95670-6114 <br /> Phone(916)464-3291 <br /> 24 November 2004 <br /> Ms.Kerry Heckman NOV 2 9 2004 <br /> Connell Motor Lift Truck i I HEALTH <br /> 2211 North Wilson Way RV I C E S <br /> Stockton, California 95205 <br /> DOCUMENT REVIEW, CONNELL MOTOR LIFT TRUCK-RIVER CITY PETROLEUM, <br /> 2211 NORTH WILSON WAY,STOCKTON,SAN JOAQUIN COUNTY <br /> I reviewed the Quarterly Report— Third Quarter 2004(Report),received 22 November 2004,prepared on your <br /> behalf by your consultant Advanced GeoEnvironmental,Inc. (AGE). The Report shows that groundwater flow <br /> direction varies from north to east to southwest(third quarter 2004), and depth to water(63 feet) is the deepest <br /> measured since 1999. Monitoring wells MW-1 through MW-17 were dry this quarter. The maximum <br /> contaminant concentrations for groundwater sampled on 20 September 2004 were: Total Petroleum <br /> Hydrocarbons(TPH) as Gasoline(TPHg, 1,900 gg/L),tert-Butyl Alcohol(8.7 gg/L), and 1,2-dichloroethane <br /> (1,2-DCA,240 gg/L). <br /> The Report states that groundwater contamination associated with the Connell Motor Lift Truck Stoddard <br /> Solvent Spill area has been characterized laterally around the suspected dry well near MW-18, and vertically in <br /> the shallow(currently dry at a depth of 40 to 60 feet or ') and intermediate upper(65' to 85' feet below ground <br /> surface, or bgs)hydrogeologic units(HUs). The Report also states that vertical and lateral extent of the former <br /> River City Petroleum Underground Storage Tanks USTs release has not been fully characterized to the north by <br /> the existing groundwater monitoring well network and previous Cone Penetrometer Testing(CPT)groundwater <br /> investigations. TPHg and 1,2-DCA contamination associated with the USTs release has migrated downward <br /> through soil into groundwater to 225' bgs, then continues westward under the building as a large dissolved <br /> groundwater plume beneath the Stoddard Solvent Spill area. <br /> The Report describes the 26 September 2004 installation of deep groundwater monitoring well MW-35 near <br /> shallow HU MW-1 in the USTs dispenser area. MW-35 is screened from 243' to 248' bgs,but no sample results <br /> were provided. The Report recommends installation of additional monitoring wells near MW-1, screened at <br /> approximately 150 feet bgs and 200 feet bgs,to monitor two sandy aquifer units previously identified by boring <br /> CPT-6,where grab groundwater analyses reported TPHg at 1,600 at 150' and 34,000 µg/L at 200'bgs. <br /> a. The Workplan for MW-35, approved by my Letter of 21 June 2004, also included approval of the <br /> 200' bgs well as a Phase I installation and the 150' bgs monitoring well as a Phase H installation. It is <br /> my understanding from conversations with AGE that, due to problems associated with the new sonic drill <br /> rig that were subsequently resolved after several days of drilling,only MW-35 was installed during Phase <br /> I in September 2004. You are now directed to install the two additional deep monitoring wells (MW-36 <br /> and MW-37)near MW-1 per the approved Workplan during Phase H, and provide installation details and <br /> sampling results in the next quarterly monitoring report, which is due 1 February 2005. <br /> b. I concur that the extent of the Stoddard Solvent Spill appears to be defined by the existing monitoring <br /> well network. I do not concur that the extent of the TPH groundwater plume is defined to the west of the <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br />