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.. '.�._; �z �: -r, x.e - • .. . 3�40 �,.' �A ";$'" -f�-.XS?9" •5�x• iii- .jki'ti�� ,zi�' j.2'.��F24.Sf.�Y" Sjd:l'-c�� .:� � <br /> --_ I :."�: +��t. - - � _,�.,��� ; ` ''a- .�=rte �x , �a`g'"� ;.:.s-`.r5t -.�`����.�. *�•�" -s� �i::. <br /> x <br /> r �• � Jaz � ; ' W � ��, � r� ` :��`r <br /> .'� - t S•+s�' <br /> 1 Claudio Dell'Eva <br /> January 3, 1991 <br /> Page 2 <br /> D,) Tri-Regional Board Staff Recommendations states that a <br /> groundwater investigation is required if seasonal <br /> groundwater is less than 50 feet and soil contamination <br /> is found at or below the seasonal high groundwater levels <br /> or the soil contains layers of 1988 at ten gravel. e oil <br /> ' sample taken on November 2z, <br /> 77 <br /> is <br /> parts per millionr ndw otal p errlevel and soil is sandy. <br /> ns which <br /> at seasonal hig: 9 <br /> E,) All contaminated soil was placed back into the pit after <br /> each excavation and as such, soil contamination remains <br /> at this site. <br /> at this <br /> Due to the above mane iorieround at r inestiaationconditions which tis necessary tat <br /> PHS/EHD still believes a g the <br /> this site. since the gradient has been established, <br /> installation of one monitoring well 10 feet from the tank pit to <br /> the verifiad downraiewtrkdirectan ion <br /> woululd d be a star <br /> ttediby Febpoinuary <br /> this investigation. <br /> 28, 1991- <br /> zf you have any furth-r questions, contact Margaret Lagorio, Senior <br /> REHS, of my staff at (209) 45C-3449. <br /> Jogi a, M.D. , M.P.H. <br /> Healt (icer <br /> uric, A. Cotulla, REHS, Program Manager <br /> -- Envii.onmental Health Division <br /> LAC/ML:nr <br /> q; CVRWQCB -- G. L. Boggs/ J. bmaughLn <br /> �! William Hunter and Associates <br /> 2701 Cottage Way, Ste 25 <br /> Sacramento, CA 95825 <br />