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S <br /> 1 <br /> i <br /> "t 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 /> tion <br /> groundwater is less than SO feet and soil <br /> ylevels <br /> is found at or below the seasonal high groundwater <br /> or the soil contains layers of sand or gravel. The soil <br /> sample taken on November 22, 1988 at ten feet had 77 <br /> oleum <br /> bns which is <br /> parts sper million total easonal high groundwater and the rsoil is sandy. <br /> ced back into the <br /> t after <br /> E.) All ccaaniondkandas such, soil contamination exremains <br /> each excavation <br /> at this site. <br /> at this site, <br /> Due to the abovementioned <br /> groundwater in investigaconditions which tion necessary at <br /> PHS/EHD still bthe <br /> this site. Since the gradient 11 1a feet from Stheltankdpit in <br /> installation of one monitoring point to <br /> t the verified downgradient direction would be a starting p <br /> this investigation. A work plan should be submitted by February <br /> 28, 1991. <br /> If you have any further qu¢stions, contact Margaret Lagori_o, senior <br /> RENS, of my staff at p 09) 468-3449. <br /> Jogia, M.D. ; M.P.H. <br /> Heal f icer <br /> L!/jtf <br /> /Enuvrironmental <br /> ie A. Cotulla, REHS, Program Manager <br /> Health Division <br /> LAC/ML:nr <br /> c: C4xi14CB - G. L. Boggs/ S• Maughan <br /> �i William Hunter and Asss2ciates <br /> 2701 Cottage Way, ste <br /> Sacramento, CA 95825 <br /> RECEIVED s;•: �; 1 91 <br />