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4 ' Phase I —Prelzmina , Sam ling ' • Collecting between 20 and 25 soil samples for chemical testing, and • Collecting and testing between 20 to 25 groundwater grab samples ' Phase 2—Subsequent Investigation ' Based on the results of the Phase 1 investigation, additional data may be collected as follows • Drilling and installing one to three onsite groundwater monitoring wells, in Sam land Sampling testing groundwater from the onsite wells for chemical parameters, and ' • Surveying the well and sampling locations A technical report will be prepared summarizing our findings The soil sample data will provide further information on possible onsite source areas And the groundwater grab data will be used as a screening tool to delineate water quality across the Site and offsite in proximity of the ' . property The Phase 2 information may be needed to further evaluate groundwater parameters ' 3.0 SITE BACKGROUND ' The Site property is located at 541 West Grant Line Road in Tracy, California(Figure 1) The 16 acre property is an elongated strip of land approximately 125 feet wide by 595 feet long ' (Figure 2) The site is generally flat with ground surface elevations between approximately 21 to 25 feet mean sea level (msl) Currently, the southern portion of the Site, along West Grant Line ' Road, is developed with a single story commercial building and adjacent paved parking lot (Figure 2) The building was constructed in 2001-2002 and is currently occupied by Sherwin ' Williams and other tenants The northern portion of the Site is undeveloped and has an unlined storm water basin with an approximate dimension of 46 feet by 150 feet The soil removed ' during the excavation of the storm water basin was spread across the undeveloped portion of the Site creating a grade increase of approximately 2 feet Mr Tom Brenkwitz is currently the ' owner of the property and building FW4Investigation Work Phan 2 2 September 2003 TREADWELL&ROLLO,INC