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4 <br /> Stephen Poa <br /> Page 2 <br /> 5. Groundwater contamination screening of soil borings B-1 <br /> through B-9 indicated greater contamination than that <br /> revealed by groundwater sampling of monitoring wells AW-5 . <br /> through AW-8. A .minimum of two sampling events, under <br /> PHS/EHD inspections, are required to validate non-detect <br /> results. Please be informed that at the next sampling <br /> event PHS/EHD will request split samples to be analyzed <br /> by our local lab, the cost for- the sampling will be <br /> billed to Mobil. <br /> 6. Please submit an addendum to the "Supplemental . Site <br /> Investigation" by September 30, 1991, which would satisfy <br /> requirements for Problem Assessment Report as outlined <br /> in the Tri-Regional Board Staff Recommendations, Appendix <br /> A. Include in the addendum maps delineating <br /> contamination and evaluations of remedial alternatives. <br /> If you have any comments or ,questions, contact Mary Meays, EHS, of <br /> my staff at (209) 468-3441. <br /> Jogi Khania, M.D. , .M.P.H. <br /> Healt fficer� <br /> ruril A.Cotulla, REHS, Program Manager <br /> nvironmental Health Division <br /> LAC/MM:nr <br /> c: CVRWQCB - Elizabeth Thayer- <br /> c: Alton GeoScience - Tridib Guha <br /> 1000 Burnett Avenue, Ste. 340 <br /> Concord, CA 94520 <br /> c: Mark III - Greg Schobert <br /> 5101 Florin Perkins Rd': ; Sacramento, CA 95826. <br /> s <br /> W <br /> i! - <br />