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Surface &Subsurface Contamination Report Page 14 Sandhu Property Project No. 522.1 March 9, 2006 In 1 so' investigation indicated t elevimp ed ncentrations of nitrogen an ammonia ere present in the soil an acted the group n 20 the nal Water Quality Control Board established clean-up goals for the site. go or nitrogen compounds plus ammonium compounds is established at, 250 /kg in soil. The goal for groundwater was not established but should not exceed background levels. ` Several groundwater monitoring wells were constructed to assess the distribution of contaminants in the groundwater. One well, MW-5 is located off the site and is on the east side of Welty Road, a short distance from the subject Property. The available data show that ammonium and nitrogen compounds have migrated through t r, and nnpacted the Property, and have been detected in MW-5. In addition, volatile organic compounds (1,2 DCP & 1,2,3 TCP) apparently sourced from pesticides, have also been found in the well. The source of the VOC's is believed to be the northern corner of the Western - Farm Service site where there is a_iinse pad. In 2003, the owners of the site implemented a pilot study to assess the ability of inducing a chemically reducing environment to reduce contaminant concentrations. As a result of the pilot study, it was proposed that a hydrogen-releasing compound be introduced to the subsurface in the area of the tank farm. The most recent available groundwater _ mom'tWrbig report is for the second quarter of 2005. The depth to water was abo 36 et and the groundwater surface slopes to the northeast or east. Somewhat elevated concentrations of nitratt„s and 1,2 DCP were detected in /�14IW the well on the east side of Welty Road. 6. 35,275 S. Welty Road, US Can / Chvron-Texaco This site is on the opposite side of Highway 33 from the facility described above. It is operated as a paper insulation manufacturing plant. The railroad right-of- way adjacent to the site was also used as a right-of-way for a former crude oil •• pipeline. The line was installed early in the last century and has been unused for decades. A currently used pipeline transports gasoline, jet fuel, and diesel fuel. In 1995 soil samples from shallow borings indicated the presence o BTE - compounds (Benzene, Toluene, Ethylbenzene, Xylene), a�sohne, oil, and the solvent, TCE. In 1997.-a-,proundwater sample was collected thatoc ntained a breakdown product of TCE. The next year, groundwater samples were collected ` that contained gasoline, diesel, and oil range hydrocarbons. Additional groundwater samples were collected in 1999, 2002 and 2003 with similar results. In 2005, a more detailed soil and groundwater investigation was completed and a survey of nearby water wells was completed. The groundwater samples indicate that diesel and oil range hydrocarbons have migrated through 2937 Veneman Ave.,#B240 Geo-Phase Environmental Inc. Phone: (209) 569-0293 Modesto, CA 95356 Fax: (209)569-0295