Laserfiche WebLink
3939 G irnbndge Hoad <br /> Suet_ 220 <br /> C met on Park GA 9 5682 9007 <br /> . r TU 530 676 6884 <br /> fte <br /> t Fax 530 676 6885 <br /> (tigroup _ <br /> September 10, 1999 <br /> Project 797615 <br /> Ms Margaret Lagorio <br /> San Joaquin County Public Health Services <br /> Environmental Management Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re Addendum to Hydrocarbon Mass Evaluation, ARCO Facility 6100, 25775 <br /> Patterson Pass Road, Tracy, California <br /> Dear Ms Lagorlo <br /> Pinnacle Environmental Solutions, a member of The IT Group (Pinnacle), is submitting <br /> this addendum to the October 12, 1998 Hydrocarbon Mass Evaluation Report on behalf <br /> • of ARCO Products Company (ARCO) This addendum was prepared in response to the <br /> July 15, 1999 letter from the San Joaquin County Public Health Services, Environmental <br /> Health Division (PHS/EHD) The PHS/EHD requested that the addendum address the <br /> following issues <br /> • provide a copy of the well log for the on-site domestic well <br /> • provide results of sampling the on-site domestic well for petroleum <br /> hydrocarbons, including oxygenates <br /> • provide revised mass estimate and providing justification of the methods used <br /> • evaluate of chromatograms for prior soil sample analysis to assess potential <br /> MTBE impacts to soil <br /> The requested information is presented in the following sections <br /> WELL LOG <br /> The water supply well log is located in Appendix A The log shows that total well depth <br /> is 540 feet bgs, and the perforated intervals are located at depths of 396 to 416 feet bgs <br /> and 496 to 536 feet bgs The depth to water measured in June 1969 after the well was <br /> completed was 100 feet bgs <br /> CP 1C 1ArehrveWco\61001Reports16100p101 doc doe-98\1sg 1 <br />