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GeoSoly LL(-:-.r, <br /> Environmental and Hydrogeological Consulting <br /> 643 Oregon Street, Sonoma, CA 95476 <br /> Phone: (707) 996-4227 Fax: (7 07) 996-7882 �k` <br /> We Don't Just Work on Your Environmental Problems.We Solve Theml '---/ <br /> July 15, 1997 <br /> Steve Sasson <br /> Senior Environmental Health Specialist <br /> San Joaquin County,Public Health Services <br /> Environmental Health Division, Site Mitigation Unit <br /> 304 East Weber Avenue,3rd Floor <br /> P.O.Box 388 Phone: (209)468-3459 <br /> Stockton, CA 952014XM Via FAX: (209)464-0138 <br /> Subject: WORKPLAN FOR A SUBSURFACE ENVIRONMENTAL INVESTIGATION FOIL- <br /> Ronald <br /> ORRonald Nunan/Jon Jernigan for the Former UST site located at the <br /> Town and Country Chevron, 13336 Hw.y88. Lockeforl CA. Site Code: 1621 <br /> Dear Mr. Sasson: <br /> The attached workplan summarizes a plan to perform a subsurface investigation of three <br /> former gasoline underground storage tanks (USTs) and one waste oil UST located at the above <br /> designated site. The purpose of this investigation will be to determine if former USTs have <br /> impacted soil and/or groundwater beneath the site. The data obtained from the investigation <br /> will be used to supplement a health-based risk assessment and/or a remedial action plan. <br /> After reviewing driller logs of supply wells located in the vicinity of the subject site, at the <br /> State Department of Water Resources in Sacramento, it is apparent that the regional <br /> groundwater depth is 90 to 120 feet below ground surface. It is therefore not expected that we <br /> will encounter groundwater during the proposed subsurface investigation. The workplan has <br /> therefore been written to address soil contamination, only. Groundwater grab samples will be <br /> collected from the open borehole if groundwater is encountered and no groundwater <br /> monitoring wells will be constructed Step-out boreholes will be installed in addition to the six <br /> (6) (e.g. one-30 foot& five-20 foot deep), 8 inch hollow-stem auger boreholes proposed herein, if <br /> obvious signs of significant hydrocarbons are encountered in any of the outlying boreholes. If <br /> you have any questions, please call me. <br /> �,�cRED GAO{ <br /> Sincerely, <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Q Q 04 E. Weber Ave.Third Floor <br /> ifAT!t tE© a Box 388, to on CA 95201-0388 <br /> Franklin J. Goldm *HYDROGEOLOGIST Approved <br /> CEO/GeoSoly, LLC �� Denied 11MO.466 Conditions U1lJ l�Z{j, uo� <br /> Registered Geologist No. 5557 ,�- <br /> Certified Hydrogeologist No. 466 c O ff % Daatete <br /> by <br />