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L <br /> L _ TEMPORARY PIEZOMETER INSTALLATION <br /> AND DESTRUCTION REPORT lobEICE��QIED <br /> City of Stockton W LM�gYI�lOS5 2V009 <br /> Regional Wastewater Control Facility <br /> 2500 Navy Drive ENVIRONMENT HEALTH <br /> ` Stockton,California PERMIT/SERVICES <br /> San Joaquin County <br /> Condor Project No.3596Y-05 <br /> L <br /> March 25,2008 <br /> L Introduction <br /> This report was prepared by Condor Earth Technologies, Inc. (Condor) on behalf of the City of Stockton <br /> L (City) to describe piezometer installation and destruction activities conducted for the City's Regional <br /> Wastewater Control Facility (RWCF) located at 2500 Navy Drive (Site) in Stockton, California(Figures <br /> 1 and 2, Attachment A). Four temporary piezometers (PZ-1 through PZ-4) were installed on August 17, <br /> 2007 and destroyed on March 13, 2008. <br /> Work activities included the installation, survey, and destruction of four temporary piezometers (PZ-1 <br /> through PZ-4) at the above referenced Site. The objectives of the work were to conduct a short-term <br /> 6. groundwater gradient investigation in the vicinity of the Chlorine Contact Channel (CCC). Results of the <br /> groundwater gradient investigation are in a report entitled "Stockton Regional Wastewater Control <br /> Facility (RWCF) Chlorine Contact Channel Groundwater Gradient Investigation Results" prepared by <br /> `, Condor and dated February 26, 2008. <br /> All work was performed under the supervision of a California-certified Professional Geologist. The <br /> 6. fieldwork and reporting were conducted in accordance with San Joaquin County Environmental Health <br /> Department (SJCEHD) and Regional Water Quality Control Board (Regional Water Board) guidelines <br /> and requirements. This report includes project background information and a description of the fieldwork <br /> conducted. Attached to this report are: maps showing the Site's vicinity and piezometer locations <br /> 6. (Attachment A), geologic logs (Attachment B), piezometer survey data (Attachment C), and SJCEHD <br /> installation and destruction permits(Attachment D). <br /> Project Background <br /> The City proposed the installation of four temporary piezometers in order to conduct a voluntary two- <br /> week groundwater gradient study' in the vicinity of the CCC, located southwest of the San Joaquin River <br /> (SJR). Condor prepared a Temporary Piezometer Installation and Destruction Work Plan (Work Plan), <br /> dated July 25, 2007, to describe the installation and subsequent destruction of the four temporary <br /> piezometers at the RWCF. The proposed work included permit application submissions; field procedures <br /> to install the piezometers including drilling, temporary piezometer construction, and surveying; <br /> procedures to install, operate, and maintain the data transducers in each temporary piezometer; and field <br /> procedures to destroy the temporary piezometers upon conclusion of the 14-day groundwater gradient <br /> ho study. The SJCEHD verbally approved the Work Plan and issued the installation and destruction permits <br /> on August 10, 2007. <br /> L 'Groundwater sampling and laboratory analyses were not conducted during the groundwater gradient study. <br /> L <br /> Li, CONDOR <br />