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Upgradic.t Environmental consultants <br /> ENVIRONMENTAL HEALTH DIVISION <br /> May 10, 1999 304 E. Weber Ave. Third Floor <br /> P. O. Box 388, Stoc n CA 95201-0388 <br /> Approved or <br /> Ms. Carol Oz Denied 11 <br /> PHS/EHD Conditions c/8 <br /> San Joaquin County "��^-�S k <br /> P. O. Box 2009 Date s/r4/F 9 by <br /> Stockton, CA 95201 <br /> Subject: Revised Addendum to Site Contamination Work Plant <br /> Electro Delta <br /> 821 S. Wilson Way <br /> Stockton,CA <br /> Dear Ms. Oz: <br /> Thank you for today's telephone call in response to my letter of May 5. Based on today's <br /> discussion, we would like to make the following modifications to the work plan than we <br /> submitted on February 19. <br /> 1)A field survey and files review of nearby properties to identify domestic wells and similar <br /> potential receptors will be performed in conjunction with the next drilling investigation, if <br /> groundwater contamination is detected during drilling. When the drilling investigation is <br /> complete, we will prepare a Preliminary Investigation and Evaluation Report (PIER), and <br /> the receptor survey will be included in that report. <br /> 2) Upgradient will contact the present and previous owners of the property to locate a set of <br /> blueprints or other site maps that depict the configuration of the subsurface drain system in <br /> the parking lot. If we are unable to locate any information on these drains, it rr.ay be <br /> necessary to implement your suggestion to use tracer dies to track the flow of water in this <br /> system. We will show whatever information we can find on the site plan in the PIER. <br /> 3) The information you have provided regarding the direction of groundwater flow in the <br /> general vicinity makes it necessary to revise the proposed locations for some of the borings. <br /> If the prevailing flow direction is to the southeast, the previously proposed locations, all of <br /> which are on the site property, are not well suited to determining whether contamination <br /> extends off site to the southeast. Accordingly, we have revised the site map to show one <br /> boring and one well in the sidewalk along the frontage road to Wilson Way. This requires <br /> some minor adjustments in the locations of other borings: ED-5 has been moved inside the <br /> garage building, ED-3 and ED-4 have been rotated clockwise to take the place of ED-2, and <br /> well ED-7 has been moved closer to the UST excavation. We will advise our clients that <br /> drilling in the sidewalk will make it necessary to obtain Encroachment and Revocable <br /> permits from the City of Stockton, which will add some additional costs to the project and <br /> could postpone it for up to a few weeks. <br /> 9 <br /> Stockton: P.O. Box 8002,Stockton, CA 95208 (209) 772-3620 <br /> Cameron Park: 3369 Kimberly Road, Cameron Park, CA 95682 (916) 677-3055 <br />