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Advanced GeoEnvironmental, Inc . - - 17 February 2015 AGE Project No. 14-3062 Tahoe Group, Inc. Ms. Maggie Dooley 1919 Grand Canal Boulevard Stockton, California 95207 Subject: Surface and Subsurface Contamination Report Addendum TAHOE - LILLIAN 420 North Lillian Avenue, Stockton, California Dear Ms. Dooley: At your request and at the direction of the San Joaquin County Environmental Health Department (SJCEHD), Advanced GeoEnvironmental, Inc. (AGE) has prepared this Surface and Subsurface Contamination Report Addendum for the property located at 420 North Lillian Avenue, Stockton, identified as San Joaquin County Assessor's Parcel Number (APN) 143-360-15 (subject site). This addendum was prepared to update any additional information obtained or changes in site characteristics that may have occurred since the Surface and Subsurface Contamination Report was prepared. On 04 February 2015, AGE and SJCEHD personnel met at the subject site, to inspect the potential location of a septic tank/system located just northeast of the northern residence (444 North Lillian Avenue . n the Surface and Subsurface Contamination Report, AGE stated that the location was the potential site of the septic tank/system permitted for 444 North Lillian Avenue. The location contained an approximately_8-inch diameter transite concrete pipe extending from the surface. Additionally, approximately four feet below surface grade (bsg) inside the smaller diameter concrete pipe, was another concrete-like pipe, transecting the center of the vertical concrete pipe. A tape measure was inserted into the vertical concrete pipe, along one side of the transecting pipe, and was extended approximately 30 feet with no obstructions. A water level meter was inserted into the concrete pipe and extended over 100 feet; however, it was unclear if the tape was extending into open space. Additionally, no water was detected in the pipe with the water level meterr AGE did detect water at a depth of 56 feet bsg in the known water well located on-site. It is unclear whether the concrete pipe is the location of a septic tank/system, septic leach pit or additional water well (without standing water) on the subject site property. Historical permits obtained from the SJCEHD indicate that a septic tank/system was located in the area of the concrete pipe at the site; but also indicate that the tank was upgraded/replaced and moved further east onto the subject site. 837 Shaw Road• Stockton,CA 95215 Telephone(209)467-1006•Fax(209)467-1118