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� �, - - '�- �• - � _ mak_ • - � -`�R � r <br /> C <br /> A" <br /> F. <br /> ,R <br /> 1.0 INTRODUCTION <br /> This report summarizes the results of a soil vapor extraction <br /> test (VET) conducted at the Weber Point property, 141. North £l <br /> Dorado Street in Stockton C?`. (Figure 1). The test was conducted <br /> an April 25 and 25, 1991 by RESNA\WaterWork Corp, Testing was <br /> performed under the guidelines of the San Joaquin County Air <br /> Quality Management District. <br /> 2.0 PURPOSE AND SCOPE <br /> The objectives of the VET are two-fold, (1) to evaluate the <br /> feasibility of using vapor extraction as a soil remediation <br /> alternative, and (2), to provide data c,zcessary for the design of <br /> an efficient remediation system, including the selection of an <br /> appropriate off-gas treatment alternative. <br /> The test program at the subject site.consisted of the following: <br /> * A 350 minute constant rate test using well VP2 for extrac- <br /> tion and wells VP1, VP3, 14W1, MW2 and MW3 for observation; <br /> i <br /> * A 2.50 minute constant rate test using well VPI for extrac- <br /> tion and wells VP2, VP3, MW1, MW2 and ITV13 for observation; <br /> * Collection of a total of 6 vapor samples from wells VP1, <br /> VP2 and VP3. <br /> The wells utilized in the testing program consj.sted of 3 vapor <br /> extraction wells (VP1, VP3) and three groundwater monitoring <br /> wells (MW1, MW2, MQ). Although analyzabj a data were obtained <br /> " from all of the wells, only four were subjected to analysis. <br /> This is because wells MW2 and MW3 are within 10 feet on vadose <br /> wells VP2 and VP3 and do not provide appreciably different data. <br /> - The three vadose zone wells are constructed of 4 inch PVC and <br /> i were installed for Facential future use during soil remediation. <br /> These wells are screened from approa:imately 5 to 30 feet below <br /> grade. <br /> The locations of all wells at the site are shown on Figure 2. <br /> 3.0 TEST INSTRc3 ,ENTATI0N <br /> The constant rata tests were conducted with a 5 horsepower Rotron <br /> blower to provide vacuum at the extraction wellhead. Air flow <br /> rates were calculated from velocity measurements monitored at the <br />- -- - ---- -fiowlire usin -- - , - j <br /> g-a pitot tube. Zhe pressure different.-al --a-t the <br /> axtrartion and observation wells was measured with magnahelic <br /> gauges:` Temperatures in the flowline were recorded with a.mer- <br /> ` _ cury thermometer. <br /> l _ <br />