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Corporate Offices 41674 Christy Street, Frerwai,,,CA 94538-3114 (415) 659-0404 Fax: (415) 651-4677 Contr. Lic. No. 464324 November 14, 1988 San Joaquin Local P. O. Box 2009 Stockton, CA 95201 Health District 01% 4.P e n s c o ♦♦�♦ environmental ♦ services, inc. NOV 2 p 1988 _PN\11,0,y4L At , Attention: Ms. Diane Hinson PERA41TSERV(Cr-ALT/I Re: Response to RWQCB Telecopy Comments to EES Work Plan Dated May 23, 1988 Roberts Oil Facility, 903 Victor Road, Lodi, CA EES Project Number 1628G Dear Ms. Hinson: This letter is in response to our telecommunications of October 27, 1988, during which you outlined the Regional Water Quality Control Board (RWQCB) response to an Ensco Environmental Services, Inc. (EES) report and recommendations for the above referenced site. A summary of telecopy communications regarding this matter, together with an additional copy of the May 23, 1988 work plan are attached. Figure 3, within the May 23rd work plan, indicates where three (3) proposed monitoring wells are expected to be located. These wells were proposed for the purpose of defining the vertical and horizontal extent of soil and ground- water contamination underlying the site. It is anticipated that these three (3) additional wells will be sufficient to define contamination on-site. However, it is possible that additional subsurface exploration, including wells may be required. The most cost-effective approach, in our opinion, is to install three (3) wells as recommended. If it is discovered during field operations that the extent of the contamination is greater than anticipated, the installation of additional wells may become necessary. During the installation of the three (3) proposed monitoring wells, the four (4) existing on-site monitoring wells will be monitored for the presence of free-floating product. Should any product be present, it will removed by hand bailing and a periodic product removal program will be implemented upon approval of the client. As stated in the May 23, 1988 work plan, analyses of the soil and ground -water samples collected will be conducted in accordance with RWQCB Guidelines. The samples will be analyzed for the presence of total volatile hydrocarbons as gasoline (TVH), benzene, toluene, ethyl benzene, total xylenes (BTEX) and total extractable hydrocarbons as diesel (TEH) using the appropriate Environmental Protection Agency (EPA) methods. These would include the use of a flame ionization detector (FID) for TVH and TEH analyses and a photoionization detector for the BTEX analyses.