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Advanced GeoEnvironmental , Inc . 19 December 2011 AGE-NC Project No. 11-2006 Ms. Lori Duncan San Joaquin County Environmental Health Department 600 East Main Street Stockton, CA 95202 Subject: Additional Site Assessment Work Plan WARNER PROPERTY 520 North EI Dorado Street, Stockton, California Dear Ms. Duncan: At the request of Dr. P. Babu Sagireddy, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Additional Site Assessment Work Plan for the property located at 520 North EI Dorado Street, Stockton, California. The location and plan of the site are illustrated on Figure 1. This work plan is prepared as required by the San Joaquin County Environmental Health Department (SJCEHD) for procurement of a Drilling Permit. A Well and Boring Permit Application, and associated fees are attached. Upon SJCEHD approval of the permit package, AGE will schedule field work. AGE will provide SJCEHD with a minimum of 72- hours prior notice for a grout inspection. INTRODUCTION AND PREVIOUS SITE INVESTIGATION Historical occupancy research of the property identified the site as the former location of a gasoline station and, prior to the 1950s, a tannery. No records were identified that indicated any investigation had been performed at the site—eitherforthe gasoline station or the tannery. On 10 November 2011, six soil borings (61 through 136) were advanced at the subject property, under San Joaquin County Environmental Health Department (SJCEHD) Permit SR# 63855. The soil borings were advanced to depths of approximately 20 feet (132, B3 and 65) and 30 feet (131, 134 and 136) below surface grade (bsg). Grab ground water samples were collected from borings 131, B4 and 136 at a depth of approximately 30 feet bsg. A summary of laboratory analytical results is attached. 837 Shaw Road • Stockton, CA 95215 Telephonc (209)467-1006 • Fax (209)467-1118