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�.. .r/ Work Plan for Phase II Subsurface Investigation 17100 South Harlan Road Lathrop,California 95330 Partner Project Number 17-192479.1 October 16,2017 Page 12 hazardous wastes,waste water discharges,and air emissions. Specifically,the subject property was identified on the Resource Conservation and Recovery Act(RCRA) Large Quantity Generator(LQG) database. Information in the RCRA-LQG database indicates the facility generated hazardous wastes including unspecified aqueous solution, other inorganic solid waste, unspecified solvent mixture, waste oil and mixed oil, unspecified oil-containing waste, adhesives, off-specification, aged or surplus organics, unspecified organic liquid mixture,other organic solids, ignitable waste,corrosive waste, spent non-halogenated solvents, phenol, and toluene di-isocyanate, tetrachloroethylene (PCE), and spent halogenated solvents. The database report indicates a number of violations, including those classified as general violations, records/reporting, and pre-transport compliance. The subject property is serviced by on on-site septic system that is reported to consist of two 3,000- gallon septic tanks located near the northeastern corner of the subject property and associated leach lines located adjacent to the east of the septic tanks. Partner also observed evidence of at least two former trench drains that have been filled with concrete inside the main building and inside the former truck repair and service shop building,which is located at the northeastern portion of the subject property. Furthermore, historical records indicate violations surrounding truck wash waters as well as boiler blowdown and cooling tower blowdown wastewater which was identified as being a "likely designated waste." The Regional Water Resources Control Board (RWQCB) reportedly issued a notice of violation and in a letter dated March 30, 2006,the RWQCB requested additional characterization of wastewater, groundwater, and submittal of work plan for installing groundwater monitoring wells;and to begin monitoring in August 2006. No additional information was available. Partner's request for additional information from the RWQCB is currently pending. Based on the history of industrial use, the storage of large quantities of hazardous materials and the generation of hazardous wastes, including chlorinated solvents, combined with the existence of a septic system, which acts as a direct conduit to the subsurface, the industrial use combined with the on-site septic represents a REC. The subject property is equipped with a formertruck repair and service building which was reported to have been operating from 1985 until approximately 2000, when it was converted to a general storage facility. Partner observed evidence of former trench drain inside the former truck repair and service shop building. Partner understands that the trench drain connected to a subsurface interceptor or storage tank that was periodically pumped out by a licensed disposal company. The interceptor and associated trench drain were reportedly cleaned, filled, and capped in place with approval by the San Joaquin County Environmental Health Department (SJCEHD); however, no documentation regarding the collection of any soil samples in this area was identified during the course of the Phase I. The history of truck repair servicing and washing at the subject property represents a REC. Based on available information obtained from the State Water Resources Control Board (SWRCB) Geotracker website for a Leaking Underground Storage Tank (LUST) site (facility identification number T0607700607) located approximately 0.3 mile north of the subject property, groundwater in the vicinity of PARTNER