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ENGEOTECHNICALGEO <br /> ENVIRONMENTAL <br /> WATER RESOURCES <br /> EXpBCP Excellence- CONSTRUCTION SERVICES <br /> Project No. <br /> 12066.000.000 <br /> May 7, 2015 <br /> Ms. Adrienne Ellsaesser <br /> Sam Joaquin County , <br /> Environmental Health Department <br /> 1868, Hazleton Avenue �� <br /> Stockton, CA 95205 " <br /> Subject: PCCP Mountain House Property <br /> Mountain House, California <br /> ENVIRONMENTAL ASSESSMENT WORKPLAN <br /> Dear Ms. Ellsaesser: <br /> On behalf of our client, Solar Finance Inc., ENGEO is pleased to submit this phase II <br /> environmental site assessment workplan for the above-referenced site (Property), located in <br /> Mountain House, San Joaquin County, California(Figure 1). <br /> If there are any comments or questions with this workplan, please do not hesitate to contact us <br /> and we will be glad to discuss. <br /> BACKGROUND <br /> Previous environmental investigation has identified subsurface impact resulting from a release of <br /> a Chevron petroleum pipeline. The work performed to date has identified the presence of soil <br /> impact but has not assessed the vertical limits of impact that remain in place. Additionally, <br /> limited soil gas assessment has not adequately determined if contamination present within soil <br /> gas could pose a risk to future land users at the Property. <br /> Soil Assessment <br /> Contaminants of potential concern (COPCs), including petroleum hydrocarbons and volatile <br /> organic compounds (VOCs) associated with petroleum hydrocarbons, have been detected at the <br /> Property during previous explorations. To further define the lateral and vertical extent of soil <br /> impact, and to confirm that the soil impact is situated at a location (laterally and/or vertically), <br /> such that no or limited soil remediation measures would be necessary to facilitate residential <br /> development of the Property. Soil borings will be advanced at four locations north of the pipeline <br /> right-of-way to facilitate soil sampling, as depicted in the attached figure. <br /> Prior to drilling, an ENGEO representative will contact the USA North Service Alert to be <br /> notified of the location of underground utilities at the site. We will retain a C-57 licensed drilling <br /> 2010 Crow Canyon Place,Suite 250•San Ramon,CA 94583•(925)866-9000•Fax(888)279.2698 <br /> www.engeo.com <br />