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PUBLIC HEALT SEb' y ICES <br /> SAN JOAQUIN COU. TY <br /> JOGI KHANNA M.D., P.H. i <br /> Health Officer <br /> P.O. Box 2009 • (I601 East Hazelton Avenue) • Stockton,California 95201 c�4 i F 64L <br /> (209) 468-34 <br /> CC nnl <br /> 0 <br /> LAURINO AND MARYLOU PONTES <br /> 19411 SUTLIFF JUL 3 0 1991 <br /> ESCALON CA 95320 <br /> RE: 707 E YOSEMITE AVE; MANTECA SITE CODE: 1466 <br /> Pursuant to the July 27, 1993 telephone conversation with Diane Hinson, <br /> Supervising R.E.H.S. of my staff, the following points of clarification should <br /> be incorporated into the pending workplan for site investigation. <br /> Due to lack of verification sampling of an alleged excavation attempt shortly <br /> after the January 14, 1987 soil sample collection, soil borings will be necessary <br /> to confirm the absence or presence of petroleum hydrocarbons in the area of the <br /> original pipeline repair. In addition to the soil boring confirmation drilling <br /> and sampling, a minimum of one monitoring well in the verified downgradient <br /> position of the tank and appurtenances will be necessary in order to provide <br /> Public Health Services, Environmental Health Division (PHS/EHD) the data for the <br /> evaluation of site certification. Gradient determination may be ascertained <br /> through nearby groundwater investigations; however, PHS/EHD is unaware of any <br /> nearby wells which would provide gradient determination. Your consultant may <br /> wish to conduct a well survey in the area to identify nearby groundwater <br /> investigations. <br /> Mary Meays, Senior R.E.H.S., will continue to provide you with site specific <br /> guidance and should you have any questions regarding this matter please contact <br /> Ms. Meays at (209) 458-0337. <br /> If you have any questions, please contact Diane Hinson, Supervising REHS, of my <br /> staff at (209) 468-3452. <br /> Jogi Khanna, M.D. , M.P.H. <br /> lth Officer <br /> Donna Heran, REHS, Program Manager <br /> Environmental Health Division <br /> DH/dmh <br /> cc: Aegis Environmental; Attn: Abel Ramirez <br /> CVRWQCB; Attn: E. Thayer <br /> A Division of San Joaquin C,ounry H rh Parc Services <br />