SITE INFORMATION AND CORRESPONDENCE

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MONITORING AND REPORTAROGRAM NO. R5-2007-XXXX • - 5 - PIONEER AMERICAS LLC TRACY, SAN JOAQUIN COUNTY (c) A table of the wellhead treatment system(s) sample analyses results from the first six months of the year; (d) Field logs that contain, at a minimum, water quality parameters measured before, during, and after purging, depth to water before and after purging, method of purging, volume of water purged, and time of purging and sampling; (e) Groundwater piezometric surface contour maps of the Upper, Middle, and Lower Horizons for the first and second quarter events; (f) A table showing construction details of all wells including well number, groundwater horizon monitored, wellhead reference elevation, depth to bottom of well, depth to bottom of borehole, and depth intervals of the screen, the bentonite seal, and the filter pack; (g) Copies of the laboratory chemical analyses reports from the first and second quarters; (h) Status of any wellhead treatment system(s), including operating time, effectiveness, and any field notes pertaining to the operation and maintenance of the system(s); and (i) The reasons for, and duration of all interruptions in the operation of wellhead treatment system(s), and actions planned or taken to correct and prevent future interruptions. The Discharger shall submit an Annual Report to the Regional Water Board by 1 February of each year until such time as the Executive Officer determines that the report is no longer necessary. This report shall contain an evaluation of the effectiveness and progress of the investigation, remediation, and any wellhead treatment system(s). The Annual Report shall contain the following minimum information: (a) Descriptions of all groundwater monitoring and sampling events conducted during the year; (b) A table showing construction details of all wells including well number, groundwater horizon monitored, wellhead reference elevation, depth to bottom of well, depth to bottom of borehole, and depth intervals of the screen, the bentonite seal, and the filter pack; (c) A table or tables of all piezometric surface measurements and laboratory chemical analyses results collected during the year; (d) A table of all wellhead treatment system(s) sample analyses results collected during the year from any system(s); (e) Cumulative data tables containing all previous water quality analytical results and depths to groundwater; (f) Table(s) showing lateral and vertical flow directions and gradients during each quarter of the year, (g) Graphical summaries of pertinent data obtained during the year; (h) Field logs that contain, at a minimum, all water quality parameters measured before, during, and after purging, depth to water before and after purging, method of purging, volume of water purged, and time of purging and sampling; (i) Copies of all laboratory chemical analyses reports prepared during the third and fourth quarters of the year; (j) Groundwater piezometric surface contour maps of the Upper, Middle, and Lower Horizons for the first, second, third, and fourth quarter events; (k) Pollutant concentration maps containing all carbon tetrachloride and chloroform data obtained during the year;