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2245 West Charter Way,Stockton <br /> Workplan for Additional Environmental Sampling <br /> August 7,2013 <br /> 2. Fieldwork <br /> a. Advance up to 9 soil borings (B 19 through B27) to approximately 10 feet bgs in the northwest portion <br /> of the property using a direct push drilling rig(See Figure 3 for locations). Groundwater is anticipated <br /> to be encountered at 7— 10 feet bgs during drilling based on information from a nearby property.Note: <br /> Field methodology is described in the next section. <br /> b. Soil samples will be collected at various depths depending on the boring location and the previous site <br /> assessment data, with the goal being to delineate the lateral and vertical extent of TKN, Nitrate, and <br /> Ammonia in the subsurface. Samples will be handled according to best industry practices with respect <br /> to sample integrity preservation and cross contamination prevention. <br /> c. Collect grab groundwater samples from 5 of the soil borings. <br /> d. Submit up to 15 soil samples for analysis of TKN and Ammonia and up to 19 soil samples for analysis <br /> of Nitrate as N. Submit the 5 grab groundwater samples for analysis of TKN, Ammonia,and Nitrate as <br /> N. <br /> e. Samples not analyzed will be archived at the laboratory for potential future analysis. In the event that <br /> additional subsurface characterization is warranted, the archived samples will be analyzed for an <br /> additional cost upon written approval from Client. All sample analysis will be conducted in a State <br /> Certified Laboratory. <br /> 3. Report Preparation <br /> a. Provide an Additional Environmental Sampling Report which will detail the onsite activities, the <br /> results of our investigation, and our conclusions and recommendations. The report will compare the <br /> results to applicable regulatory guidelines and/or background concentrations and a Professional <br /> Geologist will sign and stamp the report, and a copy of the report will be provided to the EHD. <br /> FIELD METHODOLOGY <br /> Field methods are described as follows: <br /> Site Visit to Mark Boring Locations and Locate Utilities <br /> AE personnel will visit the Site to mark boring locations and locate utility lines. USA Underground will be notified <br /> before field work begins, as previously described. Additionally, the EHD will be notified of the anticipated field <br /> work start date. <br /> Every boring location will be carefully hand-augered to five (5) feet in depth to verify utility line location prior to <br /> advancing the GeoProbe and/or hand-sampler devices. <br /> Soil Boring and Soil Sampling Protocol <br /> Drilling and sampling will conform to applicable standards for soil investigations and sampling. Dual-wall drill <br /> rod, the drill bit and sampling equipment will be decontaminated between each boring with an Alconox solution <br /> and double-rinsed with clean potable water. As each boring progresses, the lithology and other pertinent data will <br /> be recorded on a field boring log for visual description,the identification of soils and samples that are collected. <br /> Environmental Control Associates, Inc. (ECA) of Aptos, California(C-57 License#57695970) will be used for the <br /> boring and sampling operations. <br /> Borings(B 19 through B27)will be advanced to depths of up to ten (10) feet in depth for purposes of collecting soil <br /> and grab-groundwater samples. Each boring will be advanced using the GeoProbe dual-wall continuous coring <br /> method(outside diameter(OD) of 2.125'). Core will be collected in 4-foot long(1.5"OD), clear plastic,or acrylic, <br /> liners. After retrieval of a core from inside the dual-wall tube, the following regimen will be used to log and <br /> preserve samples(note: for this operation a registered professional will perform the logging). <br /> • The soil core for logging will be exposed using a ripping tool; <br /> ANDERSEN Page 2of 4 <br /> ENVIRONMENTAL <br />