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Project No. 014-13157 Page No. 2 Joaquin County Environmental Health Department (SJCEHD) inspection of a Fish & Game facility located at 4001 N. Wilson Way indicates that lab staff stated that formalin was disposed down the sink and into the septic system, and it is unknown how long this practice may have been in place prior to the use of the existing formalin neutralization system. Additionally, a utility sink with minor staining was observed in the northwestern portion of the Fish & Game shop, a facility which has historically been utilized for servicing boat engines. Consequently, given the apparent historical discharge of lab waste to the on-site septic system, coupled with the reported presence of boat servicing/maintenance operations on site and the use of hazardous materials commonly associated with boat servicing and maintenance operations, the potential exists that waste materials historically disposed within the on-site sinks have entered the on-site septic system and thereby have potentially impacted the subsurface of the subject site proximate to the 4001 N. Wilson Way building septic system. Additionally, a septic tank historically associated with the 3931 and 3975 N. Wilson Way buildings located in the southeastern portion of the subject site (adjacent to the south of the General Trailer portable office building) was abandoned in place in approximately 2008 and two replacement septic tanks were installed in different locations. According to a representative of the company which services the on-site septic systems, abandonment of the previous septic tank entailed empting the tank, filling the tank with sand/soil and compacting the soil. The representative indicated that no odors or visual evidence of environmental contamination were noted at the time of abandonment; however, no samples were collected for analysis of potential environmental contaminants. The 3931 N. Wilson Way building has been occupied by businesses that conduct vehicle repair operations and use hazardous materials since at least 1980 and the 3975 N. Wilson Way building was occupied by such businesses from at least 1980 until approximately 2000. Based on the presence of sinks and toilets proximate to shop areas in both of these buildings and the rationale discussed previously, the potential exists that waste materials historically disposed within the on-site sinks/toilets may have entered the former on-site septic system and have thus potentially impacted the subsurface of the subject site proximate to the septic tank which previously serviced the 3931 and 3975 N. Wilson Way buildings. Consequently, given the above-referenced considerations and site use factors, coupled with the environmental persistence of some of the materials potentially utilized on site such as chlorinated degreasing solvents, the condition of the subsurface of the subject site in the vicinity of the two above-referenced septic systems is unknown. As discussed previously, a sump associated with the Fish & Game lab sinks, which is reportedly constructed of concrete, is located adjacent to the south of the eastern portion of the 4001 N. Wilson Way building. The interior of the sump could not be inspected at the time of Krazan's site reconnaissance; however, even with a visual inspection of such features, it is typically difficult to assess the structural integrity of a sump and its plumbing connections due to the presence of sediments and liquids in the sump. It is presumed that the sump has only been used in conjunction with the discharge of neutralized formalin from the on-site labs as discussed previously. However, this could not be substantiated definitively through interview of available Fish & Game personnel, nor could the length of time that the sump has been in operation be specified. Given the unknown structural integrity of the sump and its plumbing connections and the potential that un-neutralized formalin was historically discharged to the sump, the condition of the subsurface of the subject site in the vicinity of the sump relative to a potential impact from formalin is unknown. During Krazan's February 20, 2013 site reconnaissance, several mounds of soil and concrete debris were observed in the northwestern portion of the subject site. No hazardous materials were observed within the visible portions of the soil/debris mounds and no odors, surface staining, or other evidence of a release of hazardous materials/waste was observed in association with the KRAZAN & ASSOCIATES, INC. With Offices Serving the Western United States 014-13157-Wilson Property Workplan FINAL