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canoniLeEnvironmentat Canonie Environmental Services Corh 1710 Main Street Escalon California 95320 FIELD METHODS phone 209 836 3507 Phone 800 926 0606 Fax 209 838 3509 The following section describes procedures used by Canonie Environmental Services Corp. (Canonie) personnel and are intended to facilitate the acquisition of accurate and reliable data GROUNDWATER MONITORING PROTOCOL Monitoring of depth to water and free product thickness within wells at the site are conducted using an Interface Probe or Conductivity Meter For consistency, all measurements are taken from the north side of the wellhead at the survey mark To assess potential infiltration of fine- grained sediments, total well depth is also sounded Product thickness is calculated by subtracting the depth to product from the depth to water In addition, water elevations are adjusted for the presence of fuel with the following calculation (Product Thickness) (0.8) + (Water Elevation) = Corrected Winter Elevation NOTE The factor of 0 8 accounts for the density difference between water and petroleum hydrocarbons. Newly installed wells are allowed to stabilize for 24 hours after development prior to free product inspection. A clear surface sampler is used for visual inspection of the groundwater in order to note sheens (difficult to detect with the Interface Probe), odors, microbial action and sediments The sampler is calibrated in inches and centimeters for visual inspection of product thickness. To reduce the potential for cross contamination between wells, the morutortngs take place in order from the least to most contaminated, of known. Wells containing free I product are monitored last Monitoring equipment is decontaminated between each well Water level data collected from the wells is used to develop a groundwater contour map for the project site Groundwater flow is estimated to be perpendicular to equipotentiall lines drawn on the map l