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Surface and Subsurface Contamination Report 1��rracon <br /> 10516 E. Peltier Road a Acampo, California <br /> April 17, 2018 a Terracon Project No. NA177074 <br /> responsibility for the transformers, and if the transformers were 'PCB contaminated," PG&E is <br /> not required to replace the transformer fluids until a release is identified. However, evidence of <br /> current or prior releases was not observed in the vicinity of the electrical equipment during the <br /> site reconnaissance. <br /> 5.0 CONCLUSIONS AND RECOMMENDATIONS <br /> The site has been utilized as agricultural land and the agricultural practice of crop production <br /> often includes the use of pesticides and/or herbicides. The agricultural activities on the site may <br /> have included the use of pesticides and herbicides. Most currently used agricultural chemicals <br /> do not persist for extended periods of time, if applied appropriately. Information that would <br /> indicate the extensive use of pesticides or herbicides on the site or parent tract was not <br /> identified. Indications of pesticide and/or herbicide misuse or vegetative stress on the site or <br /> surrounding property were not observed during the site reconnaissance. However, on the basis <br /> of the historical agricultural use of the site, if soils located on the site are to be disturbed during <br /> future excavations or construction activities, proper procedures should be followed with respect <br /> to worker health and safety. Any excavated soils to be sent offsite for disposal and any affected <br /> soils encountered should be properly characterized, treated and/or disposed in accordance with <br /> applicable local, state or federal regulations. <br /> Based on the absence of UST removal records, further investigation to evaluate the historical <br /> 500-gallon UST appears warranted. <br /> The above-ground storage tanks and chemical storage <5-gallons should be removed if not in <br /> use and/or placed in secondary containment units in a covered area. <br /> Based on absence of analytical data for the confirmation samples associated with the diesel <br /> release, the diesel release represents an environmental concern to the site at this time. <br /> Based on the presence of a burn piles and potential source of contamination, further <br /> investigation to evaluate the burn pile appears warranted. <br /> Based on the concrete containment, the observed area of staining in Shop 1 and Shop 3 does <br /> not appear to represent an environmental concern at this time. However, improved <br /> maintenance activities should be implemented to minimize the potential for future releases and <br /> spills in the area. Any stained soil or sources of contamination identified should be <br /> characterized and properly disposed in accordance with federal, state, and local regulations. <br /> Based on the presence of a plugged gas well on the site and incomplete abandonment records, <br /> further investigation to evaluate the historical plugged gas well appears warranted. Additionally, <br /> if in the future the site is redeveloped, future site buildings should not be located on top of or in <br /> the immediate vicinity of the plugged gas well. Terracon recommends that the gas well be <br /> properly located prior to site development activities. The Department of Conservation Division <br /> Responsive■ Resourceful ■ Reliable 13 <br />