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STRfNTUS <br /> ENVIRONMENTAL, INC. 3330 Cameron Park Drive, Ste 550 <br /> Cameron Park, California 95682 <br /> (530) 676-6004 - Fax: (530) 676-6005 <br /> March 16, 2001 <br /> Ms. Lori Duncan <br /> San Joaquin County, Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Ave. , Third Floor <br /> Stockton, California 95202 <br /> Re : Former Apache Plastics Facility, 2050 Fremont Street, Stockton , California <br /> Dear Ms. Duncan: <br /> Stratus Environmental, Inc. has prepared this letter to document your authorization for to <br /> make specific modifications to the scope of work that was originally outlined in the <br /> December 3, 1999 work plan. As discussed during several of our phone conversations <br /> over the course of the field operations, the scope of work required modifications due to <br /> site conditions and data gathered during the fieldwork. The following summarizes those <br /> changes that were discussed and approved. <br /> • Based on the laboratory results of the soil samples collected from the first CPT <br /> boring, hydrocarbon impact extended greater than 140 feet bgs. Therefore, the <br /> total depths of the remaining CPT borings were increased from 115 feet bgs to a <br /> minimum depth of 140 feet bgs (eight borings to 140 ft, two borings to 145 ft, two <br /> borings to 150 ft, and one boring to 160 ft). <br /> • As we discussed on February 20, 2001 , given the laboratory results of soil and <br /> water samples collected from CPT borings located on the property, one additional <br /> CPT boring was added downgradient of the suspected source area to assess the <br /> vertical and lateral extent of impact at depths greater than 100 feet bgs. <br /> • The groundwater monitoring well that was to be located northeast of the property <br /> along Freemont Street, was relocated approximately 60 feet away, in the northeast <br /> corner of the property. The original location was not accessible because <br /> underground utilities were identified during USA clearance. <br />! • The completion depths of the three groundwater monitoring wells were 115 feet <br /> bgs rather than 105 feet bgs. The increase in depth is because the interval that is <br /> to be monitored was approximately 10 feet deeper than anticipated. <br /> i <br />