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PUBLIC HEALTH SERNqCES Raul • <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <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 <br /> 2091468-3420 <br /> JOHN WEBER DEC <br /> C M WEBER ENTERPRISES INC <br /> 3757 COLLEGE AVE <br /> SACRAMENTO CA 95818 <br /> RE: Weber Point SITE CODE: 2436 <br /> 141 North El Dorado Ave <br /> Stockton CA 95202 <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHSIEHD) has completed review of the "Quarterly Monitoring Report - Third <br /> Quarter 1996 - Response to SJCPHS Letter Dated August 14, 1996" dated <br /> October 10, 1996 which was prepared by Enviros. PHSIEHD has the following <br /> comments for your consideration. <br /> The recently reported depth to water beneath the site was approximately 23 feet <br /> below ground surface (bgs). During the investigation and remediation of the site, <br /> the depth to water has been as low as 41 .3 feet bgs. Thank you for including the <br /> information which Enviros had regarding well construction details. Information in <br /> the PHSIEHD file indicates that some of the wells for which the construction details <br /> were unavailable, were drilled in April 1991 by Spectrum. MW5 was screened <br /> between 29.5 and 49.5 feet bgs and the vapor extraction wells, VEW1- VEW3 <br /> were screened between 5 and 30 feet bgs. The vapor extraction well, VEW4, was <br /> drilled on November 11 , 1991 and sampled to 33 feet bgs. Please note that MW1 <br /> was installed September 21 , 1991 instead of November 8, 1991 . <br /> The groundwater sample from RW1 and MW5 (8260) collected on August 25, <br /> 1996 did not undergo analysis until September 9, 1996, exceeding the 14 day <br /> holding period. Gasoline constituents were however detected in MW4 (1 ppb <br /> benzene and 15 ppb MTBE) MW5 (50 ppb MTBE) and VEW3 (4.0 ppb MTBE). <br /> MTBE could not be identified in samples from RW2, MW2, MW3 and the duplicate <br /> sample due to coelution with t-1,2-DCE. <br /> The vapor extraction well, VEW2, was reported dry; however, information available <br /> indicates that the well was constructed to 30 feet. PHSIEHD recommends further <br /> investigation into potential obstructions of this well. Given the current depth to <br /> groundwater, the vapor extraction wells are the only wells which are constructed <br /> with screened intervals above and below the current groundwater level. Also, <br /> further investigation regarding the reported presence of t-1,2-DCE is warranted. <br /> A Division of San Joaquin County Health Care Services <br />