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ARCADIS BBL Mr. Gray September 1, 2007 • Newark Substation; 6453 Auto Mall Parkway, Fremont, California(ARCADIS BBL) • Bollota Substation; Flood Road, Bellota, California(TPG) • Gates Substation;Jayne Avenue, Huron, California(TPG) • Los Banos Substation; Highway 152, Los Banos, California(TPG) • Midway Substation; Highway 58, Buttonwillow, California (TPG) • Stockton A Substation; Church Street, Stockton, California(TPG) • Wilson Substation; Calmyra Road, Merced, California(TPG) Site Walks and Field Preparatory Activities Soil boring locations and investigation specifics for each substation will be determined based on review of documentation provided by PG&E, including historical and current as-built maps, reports of past investigations, and a site walk. The investigations are focused on the oil-handling buildings and mineral oil distribution systems (excluding piping)which were used historically for regular maintenance and repair of transformers at each substation. Observations made during substation site walks will be used to establish site logistics and obtain depths and quantities of soil borings to be drilled at each substation. All necessary permits and licenses shall be obtained prior to the initiation of subsurface investigations. Work activities shall comply with all laws, ordinances, building and construction codes, rules, and regulations applicable to the work. Prior to initiating soil boring activities, a site-specific Health and Safety Plan(HASP) will be developed in accordance with state and federal requirements for use during the proposed field activities. Information provided within the site-specific HASP will supplement ARCADIS BBL's General Health and Safety Plan for Investigation Activities at PG&E Electrical Substation Facilities, used at all substations investigations, in addressing site-specific hazards and emergency procedures associated with the individual sites. Page: 2/5