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rINK0V 01640 1=1 <br /> IRt4NMI _ . <br /> s <br /> AL.TON Gi7=osr r=imcE, ii' c. <br /> r' <br /> January 18, 1991f <br /> 7 <br /> Mr. Clint Rogers <br /> Chevron U.S.A. , Inc. <br /> Post office Box 5004 <br /> San Ramon, California 94583-0804 X30=;325 <br /> Subject: Quarterly Ground Water Monitoring Report <br /> Chevron Station No. 9--6155 <br /> 9474 North Highway 99 <br /> Stockton, California <br /> Dear Mr. Rogers: <br /> In accordance with our agreement, Alton Geoscience, Inc. <br /> transmits this Quarterly Ground Water monitoring and Sampling <br /> Report for Chevron Station No. 9--6155, located at 9474 North <br /> Highway 99, Stockton, California. Figure 1 shows the site <br /> location. <br /> t Monitoring and sampling of the ground water monitoring wells <br /> were performed on November 18, 1990, in accordance with the <br /> requirements and procedures of the California Regional Water <br /> Quality Control Board, Central Valley Region (RWQCB) and <br /> local regulatory agencies. <br /> FIELD PROCEDURES <br /> Prior to purging and sampling the walla, the depot to ground <br /> water in each well was measured from the top of casing to the <br /> nearest 0.01 foot using an electronic sounder. Ground water <br /> at this time and checked for the <br /> samples were also collected <br /> presence of free product or sheen. <br /> Ground water analytical samples were collected after more <br /> than 3 casing volumes of ground water were purged from each <br /> well. Each sample was collected using a clean bailer <br /> (dedicated for each well) , and then transferred to the <br /> appropriate clean sample containers for delivery to a <br /> California--certified laboratory following proper preservation <br /> was <br /> and chain of custody procedures. Pur <br /> aildroumsed runduntilwaterproperly <br /> stored onsite in DOT-approved, 55--g on <br /> disposed of offsite. <br /> SAMPLIRG AND ANALYTICAL RESULTS <br /> i <br /> The results of the monitoring and laboratory analyses of the <br /> -- -- - — -ground--water-samples--for-..this-quarter., as well as the results <br /> of previous quarterly monitoring and sampling events Bare - - -- <br /> summarised in Table 1. Based on the previous wellhead <br /> 1000 flumen Avenue,Suite 140•Concord.CA W20•(415)682-1582•Fax 682.8921 <br />