SITE INFORMATION AND CORRESPONDENCE FILE 1

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NOV 04 '94 11:39AM CLE-PRWATER GROUP CLEARWATER Ms. Leah S. Goldberg November 4, 1994 Neumiller & Beardslee P. O.Drawer 20 VIA FAX Stockton, California 95201-9978 Re: Ruiz Grocery, Tracy Dear Ms. Goldberg, As we discussed the other day, I have completed my review of the documents related to the referenced project, and have prepared a cost estimate for the completion of additional field activities. The majority of the proposed scope is consistent with that outlined previously by RESNA. There are, however, selected modifications that I believe will benefit the remedial planning process. These modifications, and their relationship to the original scope, are listed as follows: Task 1) Workplan Preparation Involves the preparation of a succint letter to San Joaquin County outlining the planned course of action. Also includes costs for permitting. Task 2) Test Well Installation The RESNA scope of work called for the installation of three vapor extraction wells and a single groundwater extraction well, followed by the completion of aquifer and vadose zone testing. As we discussed the other day, the groundwater extraction well was never installed. Clearwater recommends the installation of this well and the completion of the aquifer test as planned. It is also re-commended, however, that two air sparging wells be installed, and that an air sparging test be completed following the corr�pletion of the pumping;vapor extraction testing. It is anticipated that air sparging would be an eventual (if not initial) component of the remedial approach to be taken at this site, and as such should be evaluated during this field testing phase of activity. Costs associated with well installation would be minimized due to the planned installation of the groundwater extraction well (all wells could be installed in a single day). Task 3) ,AquiferNadose Zone Testing The RESNA scope of work called for the completion of a 24 hour pumping test. The need for a 24 hour test has not been established. Clearwater recommends the completion of a 12 hour pumping; test instead, and the application of the balance of these hours to the completion of the vapor extraction test (six hours) and an air sparging test (six hours). As with the RESNA cost estimate, costs shown on Attachment A do not include soil or water disposal fees. 1125 Ada do Avenue 9 Suite 102 9 Alameda •CaUbmia+X901 •(51 M,'07-8730 8730•Fax(510)52.3-038