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Ir <br /> Quarterly Report - Fourth Quarter 2001 <br /> Guardino and Crawford <br /> 517 West Fremont Street, Stockton, California <br /> 1..0. INTRODUCTION <br /> At the request of Guardino and Crawford Construction,Advanced GeoEnvironmental, Inc (AGE) <br /> has prepared this quarterly report for 517 West Fremont Street, Stockton, California(the site) The <br /> site and its surroundings are illustrated on Figure 1 Structures,boring and monitoring well locations <br />' are shown on Figure 2 <br /> This quarterly report has been prepared in accordance with Central Valley Regional Water Quality <br />' Control Board (RWQCB) guidelines for investigations of underground storage tank (UST) sites <br /> Background information is sunm arized in Quarterly Report-June 1999, dated 27 September 1999, <br /> prepared by AGE <br /> 1 <br />' 2.0. PROCEDURES <br /> Six groundwater monitoring wells were purged and sampled on 14 December 2001 Field work was <br /> performed m accordance with San Joaquin County Public Health Services - Environmental Health <br />' Division (PHS-EHD)- approved Site Assessment Work Plan Addendum, dated 07 May 1998, and <br /> Work Plan Addendum, dated 04 February 2001, both prepared by AGE <br /> 1 <br /> 21 WASTE DISPOSAL <br /> On 15 November 2041,approximately 110 gallons of non-hazardous purge water were pumped from <br /> on-site 55-gallon drums The purge water had been generated during previous ground water <br />' monitoring events Pumping and disposal was completed by American Valley Waste Oil, Inc of <br /> Delhi,California The purge water was disposed at Seaport Environmental located in Redwood City, <br /> California A copy of the waste disposal manifest is in Appendix A <br /> 2 2 WELL MONITORING AND EVACUATION <br />' A Solinst water level meter was used to measure the <br /> depth to ground water in six wells relative to <br /> P <br /> the tops of the well casings The ground water elevations and gradient were determined from these <br />' data (Table 1) <br />' After recording water level measurements, a submersible pump was used to evacuate (purge) each <br /> monitoring well of standing water Approximately 5 to 10 gallons of water (minimum of 3 casing- <br /> water volumes)were removed from each well Ground water temperature,pH and conductivity were <br />' measured at regular intervals during purging using an Oakton water analyzer Field sheets and data <br /> Advanced GeoEuvuronmental,Inc <br /> 1 <br />