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CES <br /> PUBLIC IEALTH SER <br /> POUIry <br /> SAN fOAQUIN COUNTY 05 -.0 h <br /> r. <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 °"�iFoaN P <br /> 209/468-3420 <br /> C F—) <br /> ELROY COX g P I <br /> EMILY COX <br /> P O BOX 1046 <br /> TRACY CA 95378 MAILED NOV 2 01991- <br /> 1 <br /> RE: 595 E ELEVENTH STREET SITE CODE: 1933 <br /> TRACY CA <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has completed <br /> the review of the "Proposed Exploratory Boring, Sampling, and Monitoring Well Installation" workplan <br /> dated October 24, 1995, submitted by Wright Environmental Services, and has the following comments <br /> for your consideration. <br /> The workplan proposes the installation of ten soil borings to collect up to ten soil and grab water <br /> samples using push point technology and the installation of two additional monitoring wells using <br /> hollow stem auger technology. The workplan proposes a mobile laboratory for on site analysis of the <br /> i <br /> soil and groundwater samples. i <br /> The scope of work proposed in the workplan appears to be sufficient to continue assessment work at <br /> the site, with the following modifications. In order to utilize the proposed push point technology and an <br /> on site laboratory to the maximum extent possible, please install a sufficient number of soil borings and <br /> analyze an adequate number of soil and groundwater samples, as needed, until the full extent of the <br /> soil and groundwater plume at the site is understood. The number and location of soil borings should <br /> be based on the data collected from the site to date and on observations made during the field work. <br /> In addition, sufficient soil borings must be installed in and near the former waste oil tank pit to identify <br /> the scope of the soil problem from that source area. <br /> Please be advised that any mobile laboratory used at the site must be certified by the State of <br /> California and must be able to perform analysis for total petroleum hydrocarbons and volatile organic <br /> compounds using the purge and trap extraction process (EPA Method 5030) followed by detection in a <br /> gas chromatograph with photo- and flame-ionization detectors (EPA Methods 8015/8020/602). Any <br /> other methodology proposed may not be acceptable to this office and should be avoided. <br /> The number and location of additional monitoring wells should be based on the results of the above <br /> noted work. The exact number and location of any wells needed for installation on the Tracy High <br /> School and Heinz properties should also be based on the results of this work. Once the exact number <br /> and location of these proposed wells are decided, PHS/EHD will help in obtaining access if needed. In <br /> addition to the two wells proposed in the workplan, additional wells are needed to monitor the large <br /> area between monitoring well MW#3 and the northern edge of the property (where monitoring wells <br /> MW#1 and MW#2 are located) and the areas to the west and east of the former tank pit area. Wells <br /> to be installed for the purpose of monitoring the groundwater contaminant plume should have no more <br /> than ten feet of screen interval. <br /> A Division of San Joaquin County Health Care Services <br />