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w � <br /> Sierra-Pacific Groundwater Consultants, Inc. Y Y <br /> Geologists, Engineers, and Compliance Specialists <br /> August 21, 1997 - 1 <br /> Ms. Wendy Wyels - Site Cleanup Unit <br /> Central Valley - Regional Water Quality Control Board <br /> 3443 Routier Road, Suite A <br /> San Ramon, California 95827-3098 <br /> Subject. Revised Completion Schedule and Analytical Data Tables, Former PureGroBrea Facility, <br /> 1905 North Broadway Avenue,Stockton, California, Sierra-Pacific Project No. 94-055.04 <br /> Dear Ms. Wyels: <br /> On behalf of Unocal Corporation, Sierra-Pacific Groundwater Consultants, Inc. is pleased to submit the <br /> enclosed revised completion schedule and revised analytical data tables for the former PureGroBrea Facility. <br /> This schedule reflects a combining of the soil and ground water health based risk assessments, and also reflects <br /> the schedule for submittal of quarterly monitoring reports. <br /> The analytical data tables included herewith were originally presented in our report entitled First Quarter 1997 <br /> Quarterly Monitoring Report, Former PureGro/Brea Facility, 1905 North Broadway Avenue, Stockton, <br /> California, dated May 7, 1997. The revisions presented in this submittal reflect changes made by the two <br /> analytical laboratories, Sequoia Analytical and CLS Labs, based upon review of results with you and other <br /> RWQCB staff. The tables include Tables No. 4, 5, and 7 from the original report. <br /> Please note that we are tentatively scheduling our third quarter 1997 sampling event for September 16 and 17, <br /> 1997, at the Broadway Avenue site. <br /> Please call either Nick Nickerson at Unocal or myself if you have any questions. <br /> Sincerely, <br /> SIERRA-PACIFIC GROUNDWATER CONSULTANTS, INC. <br /> Eric D. Chase, CEG <br /> Senior Engineering Geologist <br /> EDC/jb <br /> Enclosures <br /> C. Nick Nickerson, Unocal DBG/AMG <br /> Jan Wagoner, Unocal DBG/AMG <br /> Mike Infurna, San Joaquin County <br /> (916)933-1468 <br /> 4911 Windplay Drive,Suite 4 EI Dorado Hills,California 95762 (916)933-3197 FAX <br />