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ATTACHMENT 4 STANDARD OPERATING PROCEDURES FOR SOIL BORING AND WELL CONSTRUCTION PROCEDURES Revised 06/30/02 1. Pre-Drilling Protocol Prior to the start of drilling, necessary permits, site access agreements, and/or encroachment permits are obtained "As-built"drawings are obtained if possible At least 48 hours prior to dnlling, Underground Service Alert or an equivalent utility notification service is notified A geophysical survey may be conducted to locate subsurface utilities by either Consultant or other outside third party geophysical contractors Site plans and/or"as-built" drawings are compared to actual conditions observed at the site The property owner/retailer is interviewed to gain information about locations of former UST systems including dispensers, product lines, and vent lines A visual inspection is made of the locations of the existing UST system, and scars and patches in pavement are noted The emergency shut-off switch is located for safety purposes The critical zone, which is defined as 10 feet from any part of the UST system, is identified, and any proposed drilling locations within the critical zone may be subject to special hole clearance techniques Drilling locations within the critical zone are avoided if possible Notifications are made at least 2 weeks in advance of drilling to the property owner, client representative, on-site facility manager, regulatory agency, and/or other appropriate parties A site-specific, worker health and safety plan for the site is available on site at all times during drilling activities Prior to commencing drilling, a health and safety meeting is held among all on-site personnel involved in the drilling operation, including subcontractors and visitors, and is documented with a health and safety meeting sign-in form A traffic control plan is developed prior to the start of any dulling activities for both on-site and off-site drilling operations The emergency shut-off switch for the service station is located prior to the start of the drilling activities A fire extinguisher and "No Smoking" signs (and Proposition 65 signs in California) are present at the site prior to the start of the drilling activities) The first drilling location is the one located furthest from any suspected underground improvements in order to determine the natural subsurface conditions, to be able to better recognize fill conditions, and to prevent cross contamination For monitoring wells, a 2 x 2-foot square or 2-foot diameter circle is the minimum removal For soil borings and push-type samplers, the minimum pavement removal is 8-inches When pea gravel, sand, or other non-indigenous material is encountered, the drilling location will be abandoned unless the absence of subsurface facilities can be demonstrated and client approval to proceed is obtained If hole clearance activities are conducted prior to the actual day of drilling, the clearance holes are Matn\D\Environmental\Parmar Texaco\Workplan\042003 wpd 1