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GeoSoly, LLC'' <br /> Environmental and Hydrogeological Consulting <br /> 6, 643 Oregon Street, Sonoma, CA 95476 <br /> Phone: (707) 996-4227 Fax (707) 996-7882 ` <br /> We Don't Just Work on Your Environmental Problems.We Solve Therm <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 /> r. P.O.Box 388 Phone: (209)4683459 <br /> Stockton,CA 952014)688 Via FAX: (209)464-0138 <br /> ►. Subject: WORKPLAN FOR A SUBSURFACE ENVIRONMENTAL INVESTIGATION FOR: <br /> Ronald Nunan/Jon Jernigan for the Former UST site located at the <br /> Town and Country Chevron 13336 Hwy 88. Lockeford CA, Site Code: 1621 <br /> imp <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 /> ikw <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-0 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 boreboles. If <br /> you have any questions, please call me. <br /> it DG <br /> FS!p_ <br /> Sincerely, �5 �N 1. Gp� <br /> ENVIRONMENTAL HEALTH DIVISION <br /> 04 E. Weber Ave. Third Floor <br /> CERTIFIED 0. Box 388, S12pMon CA 95201-0388 <br /> Franklin J.Gol HYDRDGEDLOGIST Approved <br /> �i <br /> ` CEO/Goly, LLC ct+> p0.466 �3 CDenied onditions <br /> Registered Geologist No, 5557 N Q. �j/ <br /> Certified Hydrogeologist No.466OFCA►�FC Date C by <br /> L <br />