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Progress of Corrective Action Measures, which documents the effectiveness of current corrective <br /> action, is submitted twice yearly in the first and third quarterly groundwater monitoring reports. <br /> MONITORING PROGRAM <br /> Water quality was monitored consistent with WDR Order No. 96-139. <br /> Groundwater <br /> The groundwater well network consists of up-gradient well MW-1 and down-gradient wells <br /> g MW-2, <br /> MW-3, and MW-4 (Figure 2). All wells are equipped with dedicated purge and sampling pumps. In <br /> January 2006, all wells were resurveyed based on the NAVD88 control rather than MSL. Top of <br /> Casing(TOC) elevations on table 1 correspond to the new surveyed elevations. <br /> Groundwater at MW-2 has been found to be impacted. <br /> Groundwater samples are analyzed for the following quarterly monitoring and field parameters as <br /> specified in WDR Order No. 96-139: <br /> Temperature <br /> pH <br /> Turbidity <br /> Volatile Organic Compounds (VOCs) <br /> Total Dissolved Solids (TDS) <br /> Chloride * <br /> Electrical Conductivity(EC)* <br /> * Per Section E-4 of the Monitoringand Reporting - <br /> ep g Program, MW 4 is nota compliance well for <br /> these parameters due to the possibility of interference from the sewage disposal ponds located <br /> directly up-gradient. <br /> Groundwater samples are analyzed annually for the following additional parameters: <br /> Sulfates <br /> Bicarbonate Alkalinity <br /> Nitrate-Nitrogen <br /> Total Kjeldahl Nitrogen <br /> Groundwater samples are analyzed every 5 years for the following constituents of concern(COC): <br /> Volatile Organic Compounds (EPA 624) <br /> Semi Volatile Organic Compounds <br /> Organochlorine Pesticides, PCBs <br /> Harney Lane Sanitary Landfill Department of Public Works/Solid Waste <br /> 1 Quarter 2007 Groundwater Monitoring Report County of San Joaquin—April 15,2007 <br /> 2 <br />