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MONITORING AND REPORTII,&OGRAM NO.R5-2003-0808 • -3 - LEPRINO FOODS COMPANY SAN JOAQUIN COUNTY as the Executive Officer determines that the reports are no longer necessary. Each semi-annual report shall include the following minimum information: (a) a description and discussion of the groundwater sampling event and results, including trends in the concentrations of poilutants and groundwater elevations in the wells, how and when samples were collected, and whether the pollutant plume(s) is delineated; (b) field logs that contain, at a minimum,water quality parameters measured before, during, and after purging, method of purging, depth of water,volume of water purged, etc.; (c) groundwater contour maps for all groundwater zones, if applicable; (d) isocontour pollutant concentration maps for all groundwater zones, if applicable; (e) a table showing well construction details such as well number, groundwater zone being monitored, coordinates (northings and eastings), ground surface elevation,reference elevation, elevation of screen, elevation of bentonite, elevation of filter pack, and elevation of well bottom; (f) a table showing historical lateral and vertical (if applicable) flow directions and gradients; (g) cumulative data tables containing the water quality analytical results and depth to groundwater; (h) a copy of the laboratory analytical data report; (i) if applicable, the status of any ongoing remediation, including cumulative information on the mass of pollutant removed from the subsurface, system operating time, the effectiveness of the remediation system, and any field notes pertaining to the operation and maintenance of the system; and (j) if applicable, the reasons for and duration of all interruptions in the operation of any remediation system, and actions planned or taken to correct and prevent interruptions. An Annual Report shall be submitted to the Board by 1 May of each year. This report shall contain an evaluation of the effectiveness and progress of the investigation and remediation, and maybe substituted for the first semi-annual monitoring report. The Annual Report shall contain the following minimum information: (a) both tabular and graphical summaries of all data obtained during the previous year; (b) groundwater contour maps and pollutant concentration maps containing all data obtained during the previous year; (c) a discussion of the long-term trends in the concentrations of the pollutants in the groundwater monitoring wells;