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v Mr. Steve Sasson Village West Workplan Addendum II -� lune 14, 1995 1-' Field work will be performed by a W.W. Irwin, Inc. staff geologist under the direct supervision of Dayne L. Frary, R.G., the project manager. All work will be conducted under the guidelines of the Site Health and Safety Plan included as Appendix A of the original workplan presently in SJCEHD files. Drilling and Sampling the Soil Borings Prior to initiation of drilling operations, Underground Service Alert (USA) will be contacted to mark all underground utilities in the vicinity of the proposed work. The required well installation permit application and check for the $89.00 fee are also enclosed with this letter, and the approved permit will be posted at the job site. As of this date, the drilling activities will be scheduled immediately following SJCEHD approval of this Workplan Addendum II. At least 72 hours prior to this date, confirmation notification will be made apprising your agency of the firm schedule so that you or a designated representative may witness drilling and sampling operations. Well borings will be advanced using a Mobile DrilF' split-spoon, hollow-stem auger drilling rig which will allow collection of soil samples from the capillary fringe. Augers will be thoroughly steam-cleaned before and after drilling each boring to prevent cross-contamination. As drilling progresses, soil will be screened for evidence of contamination and then described by the field geologist at 5-foot intervals utilizing the Unified Soil Classification System. Soil samples for laboratory analysis are to be collected using a triple split-spoon sampler at the capillary fringe just above the water table in the two borings to be completed as monitoring wells. The ends of one of the sample tubes from each depth within the vadose zone of each well boring will be sealed with Teflon' liners, capped with polyethylene caps, and taped with polyethylene or duct tape. The soil sample tubes will be labeled and placed on ice or refrigerated for transport to Sherwood Labs in Hilmar, a California DoHS-certified laboratory. Capillary fringe soil samples will be analyzed by EPA Method 8015 modified for Total Petroleum Hydrocarbons as gasoline (TPH-g); by EPA Method 8020 for the volatile organics benzene, toluene, ethylbenzene, and total xylenes (BTEX); and, if necessary, by EPA Method 8015 modified for Total Recoverable Petroleum Hydrocarbons as diesel (TRPH-d). It should be noted, however, that TRPH-d was not detected at or above the Sherwood Labs reporting limit of 500 µglf during the analyses of the spring-1994 Hydropunch® ground-water samples, and it has never been detected in samples collected from developed monitoring wells MW-4, MW-5, and MW-6. Appropriate chain-of-custody protocol will be maintained during sample collection and handling, and all sampling procedures will be in accordance with Tri-Regional Guidelines. • Water-bearing zones, including the depth of the uppermost water table, will be noted on the boring logs. During drilling, ambient air and soil samples will be monitored for organic vapors utilizing a portable organic vapor analyzer (OVA) calibrated to hexane. 3