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v A S S 0 C I A T E 5 I N C { Historical groundwater monitoring data, groundwater analytical results, and soil analytical results are included in Tables 1, 2, and 3, respectively 2 0 METHODS AND PROCEDURES To evaluate the extent of impacted groundwater at the site, a total of five soil borings were advanced and four were completed as groundwater monitoring wells in the vicinities of the former USTs and the fuel dispensers All field activities were performed in accordance with ATC's Workplan to Further Assess the Vertical and Lateral Extent of Petroleum Hydrocarbons at Eggiman, Andrew, and Edith Trust Property Located at 1112 East Harding Way, Stockton, California, dated June 14, 2002 This workplan was approved by EFID on July 18, 2002 221 Drilling Activities CPT Drilling was conducted on July 17, 2003 by Gregg Drilling & Testing Inc (State C57 license no 485165) utilizing cone penetrating testing (CPT) methods Cones mounted with sensors at the tip were advanced into the soil using direct push rods at the location shown on Figure 2 The sensors on the cone tested the response of the soil to the force of the penetrating cone and allowed the subsurface stratigraphy to be characterized The cones and rods were advanced by a hydraulic press with a down pressure capacity of approximately 25 tons Boring CPT 1 was advanced to approximately 100 feet bgs utilizing a truck-mounted CPT rig A copy of the Gregg Drilling & Testing Inc Cone Penetration Test Data is included in Appendix A After the CPT boring was advanced, Geoprobe soil borings CPTla was advanced adjacent to the CPT boring The Geoprobe was advanced to the maximum depth explored in each CPT boring ria At the maximum depth, a Hydropunch groundwater sample was collected from the boring The l�ya CPT boring and the Geoprobe boring were then grouted to the surface with a cement slurry • On December 1 and 3, 2003, an ATC geologist supervised the advancement of five soil borings to approximately 46 to 55 feet bgs A site plan with soil boring locations is shown on Figure 2 Woodward Drilling, California License C57 710079, advanced the borings utilizing a hollow stem auger drill rig Soil samples were collected from borings MW4, MW5, MW6, MW7, and SB8 at five-foot intervals in stainless steel sampling tubes The cored samples and drill cuttings were characterized for soil type, moisture content, and visual evidence of petroleum hydrocarbons A photo-ionization detector (PID) was used as a field-screening device for the detection of petroleum hydrocarbon vapors in drill cuttings and cored samples A field geologist logged drill cuttings and soil samples utilizing the Unified Soil Classification System Descriptions of soil types encountered and sample collection intervals are included on the boring/well logs contained in Appendix B Soil borings MW4, MW5, MW6, and MW7 were then completed as groundwater monitoring wells Drill cuttings were temporarily stored on site in 55-gallon DOT approved steel drums SlEnvcromentai\224931REPORTSIsumm Bloc 3