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Chevron U.S.A. - Page 2 4. To wait for the formal letter of comment identifying those specific points, and submit the addendum to the workplan to the SJLHD in order to obtain ground water monitoring well permits. Ms. Wagner indicated that a letter bearing these comments would be prepared immediately, and that the letter should be forthcoming within a few days of our telephone conversation. A telephone call was placed to the SJLHD offices on May 23, 1989, after the letter of comment from the SJLHD had not been received in our office. A conversation with a SJLHD representative named Michelle yielded information that Cynthia Wagner was no ' longer with the department. Upon our request, the SJLHD representative researched the status of the response letter from Diane Hinson, and assured our office that the letter would be prepared and mailed soon. In an effort to help expedite our investigation at the subject property, we have elected to submit an addendum based upon our verbal understanding of the comments generated by Diane Hinson, and to obtain permits to allow the investigation to proceed. Our responses have been summarized as follows: 1. In response to the comment regarding the monitoring well locations, we originally proposed to install a total of 3 exploratory soil borings at the subject property at the locations shown on the site plan which was included as Plate 2 of our proposal. The purpose of those soil borings would be to provide data regarding the presence and vertical extent of contamination in subsoils if encountered, and installation of ground water monitoring wells. Field screening of the subsoils samples will help to describe contamination persistence,in a vertical relationship to ground water. A cursory review of published ground water data suggests ground water occurs beneath the subject property at depths ranging from approximately 70 to 80 feet below the existing grade. It is our intention to relocate those wells at the SJLHD request to the locations shown on the attached site plan included at the end of the text. The well locations are now situated in the area of the subject property which could be interpreted as being possible point source locations, and in our opinion, will provide data utility to the investigation. 2. Chemical analysis requested will be modified to include low-boiling point hydrocarbons analysis. 3. We will verify any wells identified at the subject property will be researched to evaluate if well abandonment was conducted in accordance with local regulatory agency guidelines or requirements. If for any reason Dames & Moore abandons a well at the subject property, it will be abandoned in accordance with local regulatory agency guidelines. It is our desire to obtain permits for the installation of the three proposed ground water monitoring wells at the subject property during the week of Mav 29, 1989. Please find attached a completed monitoring well permit application for the installation of the wells. The $35.00 permit fees will be paid at the time the permit application is approved, prior to commencement of the field portion of our investigation.