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IL a M1VAS We're gaining new ground. March 31,2004 San Joaquin Environmental Health Department 304 East Weber Avenue, 3rd Floor -' Stockton, CA 95202 Subject: Soil borings Permit 7647 Pacific Avenue Stockton, CA 95207 i Dear Sir or Madam: Terra Vac is under contract to Circle K to conduct soil sampling at a number of sites under a j program of due diligence. Direct push methods will be used to collect soil samples at depths around the tank pit area and the dispensers at the above location. if water is encountered, a hydropunch sample will be obtained. Borings will be backfilled with grout and finished to match existing surface. A site specific health and safety plan has been prepared. The following is the general scope of work: A Probe Assessment involves the pushing of hollow rods into the ground ("probe pushes") using a pneumatic hammer. Samples from Soil Barings and Probe Assessments shall be logged in the field by an experienced geologist or other environmental professional following the Unified Soil Classification System commonly used by consultants and accepted by Agencies with respect to such matters. At a minimum, the Soil Borings and Probe Assessments will consist of the following items: (a) Four (4) borings and/or probe pushes will be located adjacent to the existing tank basin. The borings and/or probe pushes will be terminated at a depth of approximately 25 feet below grade, or until further penetration into the subsurface is refused, or groundwater is encountered, whichever occurs first. An underground locator services has been used to clear boring locations for underground lines. (b) One boring and/or probe push will be located in the vicinity of each dispenser (on the distribution line side) and one (1) to two (2) borings and/or probe pushes in I the vicinity of the distribution lines. Each boring and/or probe push will be