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GROUND ZERO ANALYSIS,INC. 1172 Kansas Avenue,Suite A Modesto,CA 95351 209.522.4119-PH 209.522.4227-FAX groundzeroanalysis.com April 19, 2018 Mr. Geoffrey Rader California Regional Water Quality Control Board Central Valley Region 11020 Sun Center Drive, #200 Rancho Cordova, CA 95670 Subject: First 2019 Semi-Annual Groundwater Sampling and Remediation Status Report—MRP No. R5-2016-0822 Valley Pacific Petroleum Services, Inc., 930 Victor Road, Lodi, CA (Figure 1) Dear Mr. Rader: This letter report summarizes the results of groundwater monitoring, sampling and remediation activities at the subject site during the fourth quarter of 2018 and the first quarter of 2019. These activities were conducted in accordance with monitoring and reporting program (MRP) No. R5- 2016-0822 issued by the California Regional Water Quality Control Board, Central Valley Region (RWQCB) on June 15, 2016. The new MRP replaced previous MRP No. R5-2002-0087. The new MRP modified the groundwater sampling schedule from quarterly to semi-annually and annually with sampling to occur in the first and third quarters. Water level and free product measurement continues on a quarterly basis. SITE ACTIVITIES In accordance with the schedule set forth in the MRP, activities at the site included monitoring water level elevations in all site wells, monitoring for the presence of free product and sampling groundwater from selected site wells on a semi-annual basis and all site wells on a annual basis (during the first and third quarters of the year). The soil vapor extraction (SVE) system was not in operation during the reporting period because the system was shut down prior with RWQCB approval,due to low hydrocarbon mass removal rates following rebound testing. A site vicinity map has been included as Figure 1. The location of the site monitoring wells, the vapor extraction wells, the SVE system compound and subsurface piping are shown on the site plan included as Figure 2.