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f <br /> TH SERVICESPUBLIC HEAL <br /> SAN JOAQUIN COUNTY r.. .y <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health OfficCoe <br /> 304 E. Weber Ave., Third <br /> Floor • P. O. Box 388 • Stockton, CA 9 i"'I". 'gyp <br /> 2091468-3420 <br /> DALE STEELE MAILED JUS. 0319y6 <br /> CALTRANS <br /> PO BOX 2048 <br /> STOCKTON CA 95201 <br /> Re: Caltrans Shop 10 Site Code: 1018 <br /> 1603 South "B" Street <br /> Stockton CA 95205 <br /> San Joaquin County, Public Health Services, Environmental Health Division (PHSIEHD) has <br /> received the permit application and fee from GEOCON. PHSIEHD has reviewed site status <br /> and has prepared the following comments for your consideration. <br /> PHSIEHD stated in correspondence dated August 29, 1995 that once the repairs to the <br /> monitoring wells were completed that groundwater samples should be collected for analysis <br /> and the results submitted to PHSIEHD. The most recent analytical results from the <br /> groundwater monitoring wells were obtained from samples collected in May 1994 and <br /> reported in the Ninyo & Moore report dated September 23, 1994. Please collect groundwater <br /> samples for laboratory analysis by August 15, 1996. <br /> As you are aware the static groundwater level has risen approximately five feet within the last <br /> two years. This poses particular problems with regard to monitoring well construction. Once <br /> monitoring well, MW11, is re-drilled, there will be nine monitoring wells. For your information, <br /> PHSIEHD has summarized available well construction details to evaluate the monitoring <br /> capabilities at your site. <br /> Well ID Total Depth Screened Interval <br /> MW9 71 feet 67 - 42 (25 feet) <br /> MW11 78 feet 78 - 63 (15 feet) <br /> MW12 78 feet 78 - 63 (15 feet) <br /> MW13 90 feet 90 - 65 (25 feet) <br /> MW14 85 feet 85 - 65 (25 feet) <br /> MW16 91 feet 91 - 66 (25 feet) <br /> MW19 90 feet 90 - 65 (25 feet) <br /> MW20 90 feet 90 - 65 (25 feet) <br /> MW24 94 feet 89 - 64 (25 feet) <br /> In the last report submitted for this site, Ninyo and Moore (9123194) indicated that given the <br /> then current depth to water (approximately 65 feet) monitoring wells, MW13, MW14, MW16, <br /> MW19, and MW20, may not be screened through the groundwater surface and accordingly <br /> the depth to groundwater may not be representative of site conditions. if this were true in <br /> 1994, it would be more so in 1996 given the continued rise of the depth to groundwater. <br /> A Division of San Joaquin County Health Care Services <br />