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AL ANNAMMMft & Associates, Inc. w. 1 ,' JAG— Environmenta� Scientists and Engineers August 12, 1993 1685-020.1pr Mr. Russell Chapin Chapin Brothers, Inc. 1203 N. Carlton Avenue Stockton, California 95203 Subject: Letter Proposal for Emergency Interim Remedial Action 1766 Monte Diablo Stockton, California Dear Mr. Chapin: On August 6, 1993 Walsh & Associates, Inc. (WALSH) detected an unknown thickness (>_3 ft) of free product in the existing monitoring well at 1766 Monte Diablo Avenue in Stockton. California. After speaking with Mr. Harlin Knoll of San Joaquin County Environmental Health Division (SCEHD) on August 9 about the floating product, it was decided that interim remedial action was necessary to mitigate the contaminants. We also discussed the issue of financial reimbursement from the SB2004 program regarding the need for three cost estimates. The matter was referred to Mr. Toru Okamoto of the state cleanup fund. During a telephone conversation with Mr. Okamoto on August 10, it was stated that because of the urgent nature of the situation and the report deadline of 45 days, three cost estimates would not be necessary providing that the charges were not deemed excessive and that the state would reimburse for the interim remedial work. Additionally, the state would reimburse for the purchase of required remedial equipment less anv residual value approximated by the consultant. WALSH is prepared to take immediate remedial action to mitigate the free product detected at the site. Initially, data will be collected to characterize the actual thickness and existence of the free product. If it is discovered that the monitoring well is acting as a sump, then passive skimming will be implemented, which involves periodically hand bailing product out of the well. If it is determined that free product is present in the soil formation outside of the monitoring well, then active skimming will be necessary. Active skimming requires the use of remedial equipment and involves product recovery and disposal. This work will be performed on a time and materials basis according to our 1993 Schedule of Charges and General Conditions. Every measure will be taken to effectively reduce the costs West Coast Division: 1734 34th Street . Suite B . Sacramento, California . 95816 . Phone (916) 737-7240 . FAX (916) 737-7245 Corporate Office: 4888 Peari East Circle . Suite 108 . Boulder, Colorado . 80301-2475 . Phone (303) 443-3282 . FAX (303) 443-0367