Laserfiche WebLink
nLDRICH <br />CLIENT MEMORANDUM <br />13 July 2023 <br />File No. 0208051-001 <br />TO: Lennar <br />Bridgit Koller <br />Vice President Forward Planning I Bay Area <br />FROM: Haley & Aldrich, Inc. <br />Jason Grant, P.E. (CA) <br />Senior Project Manager ! Engineer <br />SUBJECT: Methane Concentrations and Potential Migration <br />Tracy Hills Properties <br />HALEY & ALDRICH, INC. <br />2033 N, Main Street <br />Suite 309 <br />Walnut Creek, CA 94596 <br />925.949.1012 <br />Haley & Aldrich, Inc. (Haley & Aldrich) has prepared this memorandum to present a summary of the <br />methane concentrations and the potential migration of this methane in the vicinity of the Tracy Hills <br />properties being developed by ICGC, LLC (ICGC) and Lennar Homes of California, LLC (Lennar) located <br />adjacent to the intersection of Corral Hollow Road and Interstate 580 in Tracy, California. Haley & <br />Aldrich has collected methane data from the following three properties as documented in their <br />respective reports: <br />- 30707 Corral Hollow Road, aka City of Tracy Landfill: Limited Phase 11 and Potholing <br />investigation, dated 28 July 2020, prepared by Haley & Aldrich; <br />• 30600 Corral Hollow Road, aka KT Property, aka Hillview: Soil Vapor Sampling Results, dated <br />17 February 2022, prepared by Haley & Aldrich; and <br />• Tracy Hills Phases 2, 3, and 4: Soil Vapor and Soil Sampling Results, dated 17 February 2022, <br />prepared by Haley & Aldrich. <br />Adjacent to the Tracy Hills properties is the Corral Hollow Landfill, a closed municipal landfill with an <br />operational landfill gas collection system that undergoes quarterly monitoring, The most recent <br />monitoring report for this landfill is: <br />• Corral Hollow Sanitary Landfill, First Quarter2023 Groundwater and surface Water Monitoring <br />Report, dated April 2023, prepared by Aptim Environmental & Infrastructure LLC. <br />Copies of the relevant data summary tables included with the above -referenced reports are attached to <br />this memorandum. <br />www.haleyaldrich.com <br />