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"HEALTH SERVICESPUBLIC <br /> SAN JOAQUIN COUNTY r: <br /> ENVIRONMENTAL HEALTH DIVISION N' <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 E. Weber Ave., Third Floor • P. O. Box 388 • Stockton, CA 95201-0388 C`4C1i=0a�Q <br /> 2091468-3420 <br /> JONATHAN MARLOWE <br /> MARLOWE PROPERTIES SEP 18 1996 <br /> P O BOX 150211 <br /> SAN RAFAEL CA 94915-0211 <br /> RE: Marlowe Property SITE CODE: 1828 <br /> 4648 Waterloo Road <br /> Stockton CA 95215 <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) has completed review of the "Monitoring Well Installation Work Plan" <br /> dated August 1996 and prepared by Advanced Geo Environmental. PHS/EHD has <br /> the following comments for your consideration. <br /> The work plan proposed to install two monitoring wells to supplement MW3 and <br /> MW4 with screened intervals below the groundwater table. The work plan <br /> indicated that the proposed wells would be drilled to 90 feet and that 30 feet of <br /> screened casing would be installed. The last reported depth to the water table was <br /> approximately 64 feet. Even if 30 feet of screened casing would be approved, the <br /> well would only have approximately 4 feet of screened interval in the capillary <br /> fringe or vadose zones. PHS/EHD recommends that no more than 20 feet of <br /> screened casing be used to construct wells and that the screened interval be <br /> placed 10 feet in water and 10 feet above water. Monitoring wells, MW3 and <br /> MW4 are constructed with screened intervals between 100 feet and 80 feet. <br /> Since the proposed wells are to supplement MW3 and MW4, it will not be <br /> necessary to overlap the depths of the screened intervals. Please note that the <br /> construction of additional monitoring wells as proposed is not approved. <br /> Also, MW3 and MW4 are located approximately 40 feet from the former tank <br /> location. PHS/EHD recommends that the proposed wells be placed in an <br /> intermediate location so that both soil and groundwater information can be <br /> obtained. Soil boring, 61, drilled in July 1988 and sampled at 30 feet did not <br /> indicate soil contamination. However, the lateral extent of soil contamination may <br /> be less than 60 feet surrounding the former tank area. <br /> A Division of San Joaquin County Health Care Services <br />