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Surface and Subsurface Contamination Report l��rracon <br /> 10516 E. Peltier Road ■ Acampo, California <br /> April 17, 2018 ■ Terracon Project No. NA177074 <br /> Burn Pile — A burn pile is located on the site. The burn pile is reportedly used to dispose of <br /> vegetative debris. Burn piles can be a source of potential heavy metals and poly-aromatic <br /> hydrocarbons (PAHs)which represents an environmental concern to the site. <br /> Concrete Staining — Staining (— 3 SF)was observed on concrete slabs in Shops 1 and Shop 3. <br /> Based on concrete containment and size of the stains (— 3 SF), the staining appears de minimis <br /> in nature and is not anticipated to represent an environmental concern to the site at this time <br /> Soil Staining — Soil staining was observed near the 55-gallon waste oil drum and empty 5- <br /> gallon containers located on the west side exterior wall of Shop 2. The soils were moist due to <br /> a shadow cast from the adjacent building, therefore the size of the stains could not be <br /> determined. Based on evidence of release, the soil staining represents an environmental <br /> concern to the site at this time. <br /> Chemical Storage > 5-gallons — The barrels, drums, and containers greater than 5-gallons <br /> containing petroleum hydrocarbons and/or agricultural chemicals are not located above <br /> secondary containment. Any and all releases could potentially impact the soil. <br /> Gas Well — Based on information obtained from DOGGR, a plugged and abandoned former dry <br /> gas well is located on the site. Drilling activities/mud associated with deep well drilling have the <br /> potential to contaminate shallow soils at the site. Additionally, DOGGR records indicate the <br /> former dry gas well abandonment was incomplete and there was no information on <br /> abandonment activities by the prior owner when they took responsibility of the well in 1957 <br /> which represents an environmental concern to the site. <br /> Groundwater Wells — One domestic groundwater well and two agricultural groundwater wells <br /> are located on the site. If wells are not properly operated and maintained, they can serve as <br /> contamination conduits to groundwater. There is no evidence to suggest that the wells may be <br /> contaminant pathways on the site or vicinity. <br /> Septic System, Sump, Interior Floor Drain — A septic system was identified west of the <br /> existing residence. One sump was observed in the existing residence basement and reportedly <br /> connects to the existing septic system. One interior floor drain was observed in the former <br /> break room with kitchen and reportedly connects to the existing septic system. Odors, staining <br /> or evidence of release from the sump or floor drains were not observed. Septic systems may be <br /> used for inappropriate disposal of hazardous substances. There is no evidence to suggest that <br /> the existing septic systems may be contaminant pathways on the site or vicinity. <br /> Transformers — Four pole mounted transformers were observed on the eastern and western <br /> boundaries. The transformers are owned and serviced by Pacific Gas & Electric Company <br /> (PG&E); however, no information with regard to PCB content of the transformer fluids was <br /> observed. Some transformers contain mineral oil which may contain PCBs. PG&E maintains <br /> Responsive ■ Resourceful ■ Reliable 12 <br />