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SheaHomes Caring since 1881 Ll TECHNOLOGIES INC i E 8 Frank West Circle Suite 2580,%,ea Center Drive Stockton CA 95206 Dave Sargent Liuerrnore, CA 945.51 Phone 209.234.0518 CONDOR� Pie feet Director FAX 209.234.0538 dai�idsargerrt�s6ecrhnuaes.taus T 925245-3 767 www,condorearth.corn C 925.580.0777 _ Shen rMountain Hoarse,LLC F 925.265.2266 �i@y(' +' p , November 11,2011 Mr. David Sargent E1%iV;'lcal�''.'l�t^t.,-,'f HIFAU04 Shea Homes Mountain House, LLC PERN11`178-Ei vi,CES 2580 Shea Center Drive Livermore, CA 94550 Re: Phase I Environmental Site Assessment Update Report for Neighborhood K and Neighborhood L,Mountain House,California Condor Project No.4601 Dear.Mr. Sargent: This is a report of findings for the Phase I Environmental Site Assessment (ESA) update for Neighborhoods K and L with Assessor's Parcel Numbers (APNs) 258-040-01, 209-170-03, and 209-040- 09 (Site) (Figures I through 3, Attachment A). Condor Earth Technologies, Inc. (Condor) is submitting this report in order to update the Neighborhoods D, K, L, and Town Center Phase I Environmental Site Assessment Report and a Partial Response to Mountain House Master Plan Chapter Six, Mountain House, San Joaquin County, California, dated November 30, 2004 and prepared by Condor. The Phase I ESA was performed in accordance with the guidelines set forth in Practice E 1527-00, Standard Practice for Environmental Site Assessments: Phase I Environmental Site Assessment Process, published in May 1993 (Revised 2000)by the American Society for Testing and Materials (ASTM) and in accordance with the prevailing standard of care for completing such assessments in California at the time of the site visits. This update report was conducted in accordance with the guidelines set forth in ASTM Practice E 1527- 05, published November, 2005, which is the most recent Phase I ESA Standard published by ASTM. This report includes a summary of the Phase I ESA conclusions and a description of changes in both environmental database searches and to Site conditions. SUMMARY OF PHASE I ESA Neighborhoods K and L comprise approximately 700 combined acres. In the 2004 Phase I ESA, Condor identified the following recognized environmental conditions associated with the Site: • The historical application of agricultural chemicals for agricultural purposes on both Neighborhood K and Neighborhood L. • Th two w ewater treatment reservoirs located in the southeastern portion of Neighborhood L and associated potential impacts to the soil and/or groundwater from storage and/or land N application of treated wastewater in Neighborhood L. — 1` • The identified petroleum hydrocarbon contamination of soil and groundwater associated with the Old Valley-Pipeline.immediately south of the Site(Neighborhood L). - • The tw6 active pipelines,(a six-inch diameter Chevron/Texaco petroleum pipeline and a 12-inch diameter Kinder-Morgan petroleum pipeline)paralleling Byron Road and the railroad tracks south of the Site(Neighborhood L).