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cmc Center Squares <br /> 2444 Main Strer_t, Suite 215 <br /> Fresno. California 93721-2734 <br /> ��4DR9Si0iTf <br /> (209] 264-2535 • FAX(2091264-7431 GEOMATRIX <br /> 9 December 1996 <br /> Project C2657 <br /> Ms. Katie Hower <br /> Chevron Pipe Line Company <br /> 4000 Executive Parkway, Suite 400 <br /> Bishop Ranch 8 <br /> San Ramon, California 94583-0959 <br /> Subject: Pilot Separate-Phase Oil Removal Program <br /> Alden Park <br /> Tracy, California <br /> Dear Ms. Hower: <br /> The results of a pilot program for removal of separate-phase oil from nine monitoring wells at Alden <br /> Park (the site) in Tracy, California (Figure 1) are presented in this report. Monitoring well locations <br /> are shown on Figure 2. The pilot program was implemented by Geomatrix Consultants, Inc. <br /> (Geomatrix) on behalf of Chevron Pipe Line Company(CPL) for four continuous weeks. The purpose <br /> of the program was to confirm that product removal is feasible and to collect data to enable Geomatrix <br /> to design a cost-effective removal program. In addition to removal of oil from the wells, Geomatrix <br /> visually observed the ground surface in the park for the presence of separate-phase oil; no material was <br /> observed during this time period. <br /> Field Program <br /> The pilot program was conducted on 19 September, 27 September, 4 October, and I 1 October 1996. <br /> The effectiveness of the program was evaluated weekly. The depth to groundwater or the depth to the <br /> top of the separate-phase oil was measured in wells MW-1, MW-3, MW-6, MW-15, MW-16, and <br /> MW-l8 through MW-21 using an electric water level sounder or a weighted steel tape. The viscosity <br /> of the separate-phase oil precludes the use of an interface probe or steel tape in combination with <br /> water/oil sensitive paste to measure the thickness of the accumulation of separate-phase oil in the <br /> wells. If possible, the thickness of the separate-phase oil was measured using a clear acrylic bailer. if <br /> the bailer was returned to the surface completely full, the thickness was reported as greater than 3 feet <br /> (the length of the bailer)or the thickness was estimated during the removal process(described below). <br /> In wells containing 1-foot or less of separate-phase oil, the oil was removed using a stainless steel <br /> bailer. In wells containing greater than I-foot of separate-phase oil, the oil was removed using a <br /> vacuum truck(services provided by Sturgeon and Sons). If the thickness of the separate-phase oil was <br /> estimated to be less than 3 feet but greater than 1 foot, the vacuum hose was lowered to the surface of <br /> the oil, suction was applied,and the vacuum hose was slowly lowered into the well the estimated depth <br /> of the oil thickness. The vacuum hose was removed from the well,the tip of the vacuum hose was then <br /> Geomatrix Consultants, Inc. <br /> EnA9pg&qVl'pl� nd Environmental Scientists <br />