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GROUNDWATER MONITOR WELLS <br /> FOURTH QUARTER 2004 MONITORING REPORT <br /> RMC PACIFIC MATERIALS - KERLINGER AGGREGATE FACILITY <br /> 30350 South Tracy Boulevard, Tracy, California <br /> San Joaquin County Site #1737 <br /> INTRODUCTION <br /> This report presents the Fourth Quarter 2004 results of groundwater monitoring-well <br /> samplings undertaken on December 15 and 16, 2004 by RMC PACIFIC MATERIALS (RMC) at <br /> the above-referenced property The report describes the sampling protocol utilized and the results <br /> of laboratory analyses on the samples <br /> MONITORING PROTOCOL <br /> The sampling and analyses of the groundwater monitoring wells were undertaken in <br /> accordance with the sampling requirements delineated by the San Joaquin County Environmental <br /> Health Department (EHD) in their November 6, 2003 letter to RMC The sampling process used <br /> in groundwater monitoring wells MW-04, MW-05, MW-06, MW-07 and MW-08 was as <br /> follows <br /> • The well caps were removed prior to measurement and sampling to allow equilibrium <br /> with atmospheric pressure <br /> • Depth-to-water measurements were made using an electronic water tape and recorded on <br /> field sheets (Table 1, field sheets in Appendix 2) The depth-to-water measurements were <br /> also used to determine if the groundwater gradient among the wells had changed since the <br /> wells were last sampled in September 2004 <br /> • The volume of water in each well was calculated in the field using the measured depths- <br /> to-water <br /> • The wells were purged of three casing volumes of water using the dedicated bladder <br /> pumps in each well <br /> • Field readings were taken at approximately three-gallon intervals to monitor the pH, <br /> temperature and conductivity of the extracted water (Appendix B) <br /> • Groundwater samples were collected into laboratory-supplied 40-m1 VOA vials and one- <br /> liter amber glass sample bottles <br /> • The sample containers were properly labeled, placed into a cool icechest and transported <br /> under strict chain-of-custody documentation to Severn Trent Laboratory (STL) in <br /> Pleasanton, California for analysis <br /> • The samples were analyzed by EPA method 8015M for diesel range petroleum <br /> hydrocarbons (TPH-diesel) and by EPA method 8021B for benzene, toluene, ethyl <br /> benzene, and xylenes (BTEX) <br /> Quarter 4 Sampling Report-2004 <br /> Page 1 of 2 <br />