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Luhdorff sScnlmanini RECEIVED <br /> Consulting Engineers <br /> NOV 16 2022 <br /> ENVIRONMENTAL HEALTH <br /> November 10, 2022 PERMIT/SERVICES <br /> File No. 16-1-015 and 16-1-016 <br /> Mr. Rodney Estrada, Lead Senior REHS Mr. David Kwong, Director <br /> San Joaquin County San Joaquin County <br /> Environmental Health Department Community Development Department <br /> 1868 E. Hazelton Ave. 1810 E. Hazelton Ave. <br /> Stockton, CA 95205 Stockton, CA 95205 <br /> SUBJECT: 2021 Annual Groundwater Monitoring Report Teichert Aggregates and <br /> Granite Construction Co. Quarry Excavation Operations, Vernalis Area, San Joaquin <br /> County, CA <br /> Dear Mr. Kwong and Mr. Estrada: <br /> On behalf of Teichert Aggregates and Granite Construction Co., Luhdorff&Scalmanini Consulting <br /> Engineers (LSCE) submit the enclosed report titled "2021 Annual Groundwater Monitoring Report— <br /> Teichert Aggregates and Granite Construction Co. Quarry Excavation Operations,Vernalis Area, San <br /> Joaquin County, CA". <br /> This Groundwater Monitoring Report was prepared to satisfy both Teichert's(QX-91-5 and PA- <br /> 0500847) and Granite's(QX-94-1) permit requirements related to groundwater monitoring and <br /> reporting activities, and also Granite's approved groundwater monitoring plan ("Groundwater <br /> Monitoring Plan for Granite's Vernalis Plant, San Joaquin County, CA", LSCE, February 9, 2009). <br /> The monitoring data record documents very stable groundwater quality conditions and shows no <br /> indication that mining operations have changed groundwater quality to date. <br /> Sincerely, <br /> LUHDORFF &SCALMANINI <br /> CONSULTING ENGINEERS <br /> CC <br /> Jeanette Lovelis, P.G. <br /> Geologist <br /> 500 First Street (530)661-0109 <br /> Woodland,CA 95776 www.Isce.com <br />