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Mr. Wayne Deitz • • June 25 2008 Workplan—Groundwater Sampling Page 3 of 5 present on the site. Buried debris was also reported in the area. The reported tank sizes were described as 1000-gallon USTs on the south side and 5,000-gallon USTs on the north side. They noted liquid pooling on the west side of UST No. 1. SCA collected soil samples and analyzed the samples for a variety of compounds. SCA found total petroleum hydrocarbons (TPH) as gasoline and lead near the UST No. 1, and TPH as diesel and motor oil, low levels of DDT and DDE, and arsenic in fill on the east side of the site. SCA also identified large amounts of debris in the eastern portion of the site. 4.0 SCOPE OF WORK In order to assess the potential impacts to groundwater from the neighboring LUST property located to the north of the site and other on-site environmental concerns (such as the identified on-site USTs), ROKEN will procure the services of a licensed drilling contractor and advance ten (10) borings at various locations within the site as depicted in FIGURE 1. Groundwater samples will be collected from each location. ROKEN anticipates that groundwater will be encountered at a depth ranging from approximately 25 to 45 feet bsg. ROKEN will notify Underground Service Alert (USA) at least 48 hours prior to the drilling start date. ROKEN will review available as-built drawings to determine the presence and alignment of on-site utilities, as provided by SHI. ROKEN will visually inspect the site prior to drilling. In addition, ROKEN will procure the services of a utility locating contractor to check the proposed drilling locations for buried utilities and buried metal obstructions. The contractor will rely on the site specific effectiveness of a suite of electromagnetic line locating (EMLL) equipment to detect these subsurface features. ROKEN will prepare a health and safety plan for work conducted at the site as required pursuant to the regulations in 29 Code of Federal Regulations (CFR)Part 1910.120 and California Code of Regulations (CCR), Title 8, Section 5192. ROKEN and contracted personnel involved with the proposed field work will review proper health and safety practices and all will sign the health and safety plan following their review of the document. GROUNDWATER SAMPLING AND ANALYSIS ROKEN's drilling contractor will use the direct push drilling method to collect groundwater samples at ten(10)on-site sampling locations as depicted in attached FIGLIRE 1. ROKEN estimates that the field work can be completed in two (2) to three (3) days. At each sample location a soil boring will be advanced to depths of approximately 45 feet bgs or less depending on the depth that groundwater is encountered at this site. No soil samples will be collected for this investigation. At each groundwater sample location,temporary PVC well screens may be placed in the boring to collect groundwater. The temporary well will not be purged or developed. At each boring location,groundwater"grab"samples will be collected in laboratory provided sample containers to allow for the following laboratory analyses: EPA Method 8260b-VOCs, TPH as Gasoline, 7 fuel additives and lead scavengers EPA Method 8270 - Semi Volatile Organic Compounds 3