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PUBLIC HEALTH SERVICES oPa�,N c <br /> SAN JOAQUIN COUNTY �. Z <br /> ENVIRONMENTAL HEALTH DIVISION N: <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br /> 445 N. San Joaquin Street • P. O. Box 388 • Stockton, CA 95201-0388 c4�iFi60 P <br /> 209/468-3420 <br /> STEVE GILBERT <br /> U-HAUL INTERNATIONAL <br /> (AMERCO REAL ESTATE) <br /> FUEL AND ENVIRONMENTAL MANAGEMENT DEPT <br /> 2721 N. CENTRAL AVENUE, SUITE 700 _ <br /> PHOENIX, ARIZONA 85004 FEB 0 i3 tt�Q <br /> RE : U-Haul Company of Fresno SITE CODE : 1772 <br /> 2701 N. Wilson Way <br /> Stockton, CA 95205 <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS-EHD) has recently reviewed the "Additional Site <br /> Assessment Workplan" dated November 28 , 1994 as submitted by Sota <br /> Environmental Technology Inc . , and has the following comments . <br /> In section 4 . 1, monitoring well drilling techniques mention that <br /> 4-inch diameter casing is to be placed and that 8 1/2 inch hollow <br /> stem augers (HSA) are to be used. In order to allow adequate <br /> annular space for construction, PHS-EHD will require HSA that <br /> allow at least an 8-inch inner diameter (811id) for 4-inch casings <br /> on monitoring wells . An annular space of two inches all around <br /> the casing is required during monitoring well construction to <br /> prevent bridging during the filter pack placement . Monitoring <br /> wells with proposed 2-inch casings may use 8 1/2 inch outer <br /> diameter (8 1/2"od) HSA, or greater, that allow 6 "id. <br /> PHS-EHD does not recommend the use of screened intervals of T <br /> casing that exceed twenty (20) feet . Historical groundwater <br /> depths since August 1991 indicate that the deepest depth to rgroundwater occurred in September 1992 (85 . 50 bgs) . The .� � <br /> shallowest depth recorded was 73 . 661bgs during May 1993 . A <br /> screened interval that encompasses this interval , plus a margin <br /> for seasonal fluctuations, will be the proposal that will be <br /> approved by PHS-EHD. <br /> Initial monitoring well (MW' s 1, 2 , and 3 ) construction was <br /> approved for 25' of screen since no current groundwater <br /> information was available for the area at the time of well <br /> placement . Recent well construction of MW' s 4 , 5 , and 6 have <br /> limited screened casing intervals to 20 ' . Unless sufficient <br /> cause for the proposed 35 ' length of screened interval can be <br /> provided, the well casing screened interval shall be limited to <br /> 20 ' . <br /> A Division of San Joaquin County Health Care Services <br />