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R �1 . Mr Sam Savig Project 880-040 IA December 4, 2001 Page 2 sampling and excavation were reported in IT's Product Line Upgrade and Soil Excavation Report dated March 15, 2000 The San Joaquin County Public Health Services Environmental Health Division (SJCPHS/EHD) requested further delineation of soil and groundwater impacts in their April 24, 2000 letter A total of five Geoprobe® borings (GP-1 through GP-5) were completed on August 15 and 16, 2000 using a direct push rig The borings were advanced to groundwater at which time a discrete water sample was collected Following groundwater sample collection the borings were continued to a maximum depth of 30 feet bgs Three groundwater monitoring wells (MW-1 through MW-3) were installed on September 6, 2000 at the locations shown on Figure 1 The well locations were selected based upon results of the Geoprobe® investigation GROUNDWATER MONITORING RESULTS Groundwater samples and depth to water data were collected on November 1, 2001 from monitoring wells MW-1 through MW-3 The groundwater monitoring event was coordinated with the Blaine Tech Environmental who monitors the 76 Station east of the subject site Groundwater samples were analyzed for the presence of total petroleum hydrocarbons as gasoline (TPH-g), benzene, toluene, ethylbenzene, xylenes (BTEX compounds), and for five gasoline oxygenates (methyl tert-butyl ether [MtBE], di-isopropy ether [DIPE], ethyl tert-butyl ether [ETBE], tert-amyl methyl ether [TAME] and tert-butyl alcohol [TBA]) using U S Environmental Protection Agency (EPA) Methods 8015 Modified, 8020 and 8260, respectively Field and laboratory procedures are presented as Attachment A Certified analytical reports, chain-of-custody documentation, and field data sheets are presented as Attachment B Fourth Quarter Groundwater Monitoring Results Groundwater levels at the site have decreased an average of 1 01 feet since the previous sampling event on July 27, 2001 Groundwater flow during the third quarter was generally to the north at an average gradient of 0 002 ft/ft, which is consistent with the previous sampling event Groundwater elevation data are presented in Table 1 A groundwater elevation contour map based on the November 1, 2001 data is shown on Figure 1 IT CORPORATION SACIIISACRFPIICOMMON1sacDP120011PRJ\PJ818800401A lab doc-ONt 1 (01070000)