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Ms. Katie Hower • • f <br /> f a�- <br /> Chevron Pipe Line Company CE-:OrvlATR1x <br /> 9 December 1996 <br /> Page 2 <br /> inspected for the presence of water droplets, and a bailer was used to assess the thickness of separate- <br /> phase oil remaining in the well, if any. <br /> If the thickness of the separate-phase oil was estimated to be greater than 3 feet, the vacuum hose was <br /> lowered to the surface of the oil, suction was applied, and the hose was slowly lowered approximately <br /> 3 feet. The acrylic bailer was again used to assess the thickness of the separate-phase oil remaining in <br /> the well, if any. This process was repeated until the measured amount of oil was less than one foot. <br /> When the amount of oil was less than 1 foot, the oil was removed using a stainless steel bailer. <br /> The estimated thickness of the separate-phase oil measured in each well during the pilot program is <br /> summarized in Table 1. The estimated volume of product removed from each well during the pilot <br /> program is summarized in Table 2. Volumes were estimated by calculating the total thickness of oil <br /> removed from the wells in feet, and converting the total feet removed in a 4-inch well to volume <br /> reported in gallons. The recovered oil was recycled at CPL'S Los Medanos station in Pittsburg, <br /> California. <br /> During the first week of the pilot program,two collection vaults located in the park (one in the vicinity <br /> of MW-1 and the other in the vicinity of MW-3) were opened and assessed for the presence of <br /> separate-phase oil. The vault in the vicinity of MW-3 was observed to contain water and a sheen <br /> indicating the possible presence of separate-phase-oil. The water was pumped from the vault. The <br /> vault in the vicinity of MW-1 was observed to be dry. <br /> Results and Recommendations <br /> In general, the thickness of the separate-phase oil accumulated in each well changed little over the <br /> duration of the pilot program. The estimated volume of separate-phase oil removed during the pilot <br /> program was 105 gallons. <br /> The results indicate that recovery is feasible. The current program appears to be cost effective for CPL <br /> at this time. Geomatrix recommends continuing the removal of the separate-phase oil on a weekly <br /> basis using the methods described herein until the maximum thickness of oil accumulated in each well <br /> between weekly site visits is less than 1 foot. At that time Geomatrix recommends reducing the <br /> frequency of removal to every other week. The need for and frequency of removal will be evaluated as <br /> the program progresses. Progress reports will be provided as required. <br /> Please call if you have any questions. <br /> Sincerely yours, <br /> GEOMATRIXL�Cf}ONNSSULTANTS, INC. <br /> n <br /> I a nr%ZeJjLetorlsoEgineer Principal <br /> Hydrogeologist <br /> LWROMCT 265%1657-19.DOC <br />