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' Stockton Plating Inc. <br /> Soil & Groundwater Investigation <br /> April 19, 2994 <br /> Page - 9 - <br />' surveyed elevations were used in conjunction with the depth to <br /> water measurements to estimate the groundwater gradient at SPT. <br />' 4.5 Groundwater Sampling <br /> On February 22, 1994, a Condor representative was on site to <br />' collect groundwater samples from MW1, MW2, and MW3 . Prior to <br /> sampling, the static water level in each well was measured to the <br />' nearest 0 . 01 foot with a standard water level meter. A <br />' disposable bailer was then lowered into each well to check for <br /> floating product, sheen, and petroleum odors . <br /> The wells were purged of at least 3 casing volumes until the <br /> pH, electrical conductivity, and temperature of the water <br /> stabilized. The purge water was discharged to drums on site to <br /> await disposal pending laboratory results . Prior to sampling, <br />' the wells were allowed to recover to at least 80% of the pre- <br /> purge water level . <br /> 1 <br /> The groundwater samples were collected with a clean <br />' disposable polyethylene bailer and transferred to two 40-m1 glass <br />' volatile organic analyses (VOA) vials and two 1-13-ter, amber, <br /> glass bottles . Each sample container was labeled, placed in a <br /> cooler chilled with Blue Ice, and delivered within 24-hours under <br /> chain-of-custody procedures to GeoAnalytical Laboratories in <br /> Modesto, California. <br /> Q�� CONDOR <br />