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E N V I R Page 5 January 29, 2019 ES S M E N T, PC Project Number 2018-10-038 Groundwater The subject site was located on the San Joaquin County groundwater contour map from spring 2009, the elevation of groundwater in the vicinity of the site is approximately 15 below sea level. The ground elevation at the site is approximately 60 to 65 feet above groundwater. However, due to the recent drought with in the State of California groundwater levels have dropped to more than 70 feet below the ground surface in the past. Recent sampling shows a recovery of the water table to closer to past levels. 3. MONITORING WELL INSTALLATION HISTORY The Monitoring Well Installation Workplan and Groundwater Sampling and Analysis Plan were prepared on October 17, 2005. The workplan included the installation of three monitoring wells and identified the constituents that were to be analyzed. The workplan with addendums was approved by the Regional Board on February 9, 2006. The onsite monitoring wells were constructed from March 13 to 17, 2006. Detailed well information is located in the Appendix. Monitoring well locations are illustrated on Plate A3. Monitoring of the three site related monitoring wells has occurred each quarter since the installation. 4. QUARTERLY MONITORING EVENT, FOURTH QUARTER 2018 EVENT Groundwater measurements were collected on December 20, 2018 as part of the Fourth Quarter 2018 Sampling Event. The three monitoring wells were purged of at least three volumes of water prior to sample collection. Samples were sent to California Agricultural & Environmental Laboratory for analysis, However, Samples were transported by California Agricultural & Environmental Laboratory to Precision Enviro-Tech Analytical Laboratory of Stockton CA for ENVIRO ASSESSMENT,PC ENVIRONMENTAL•ENGINEERING•GEOLOGY PHONE (844)742-7311 FAX (877)623-5493