SITE INFORMATION AND CORRESPONDENCE (2)

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i r ENVIRONMENTAL HEALTH DEPARTMENT SAN JOAQUIN COUNTY Unit Supervisors Donna K.Heran,R.E.H.S. Carl Bergman,R.E.H.S. _ 304 East Weber Avenue, Third Floor Director Mike Huggins,R.E.H.S.,R.D.1. Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. P+ograin Mmmger Telephone: (209) 46$-3420 Margaret Lagorio,R.E.H.S. o9Cic 69 Laurie oA.g Corolla,R.E.H.S. Fax: (209) 464-0138 Robert McClellan,R.E.H.S. Program Monnger Mark Barcellos,R.E.H.S.. FEB 2 6 2004 DURHIM ALI JUBARI NAGI SALEH-ALI MOHAMED/HUDA GUBARY 667 O' FARRELL ST #10 PO BOX 1322 25 PONCETTA DR #201 SAN FRANCISCO CA 94109 RIVERBANK CA 95367 DALY CITY CA 94015 RE: Ranch Market Site Code: 2412 23569 S. Santa Fe Rd. RO#: 000436 Riverbank, CA., 95367. CUF#: 015211 San Joaquin County Environmental Health Department (EHD) has reviewed Free Product Discovery and Proposed Actions dated February 18, 2004 and Ground Water Monitoring and Remedial Status Report— First Quarter 2004 as submitted by your consultant, GEOCON, on February 23, 2004 and has the following comments. Due to measurable free product (weathered gasoline) in onsite MW-3, GEOCON has proposed to continue to monitor and remove the product. Additionally, the proposal included instituting methods to define locations of possible unknown underground storage tank (USTs) remaining onsite that may be contributing to the additional contamination. EHD concurs that the free product should be monitored and removed. EHD also concurs that a search to locate any additional USTs remaining on site be conducted. Based on specific site details and a history related to EHD from neighbors, the search for any USTs should also include areas next to, and north of the store to the end of the property, and not just under the asphalt areas in front of the market. EHD never received the tank tracking records from the UST removal in 1991. Subsequent meetings with the EHD UST Unit and the former owners of the property required these papers to be submitted. As of this date, the tracking records were never submitted and the disposition of the removed USTs is still unresolved. Please provide verification that the USTs removed in 1991 were properly disposed of and not reinstalled someplace else on site as has been speculated. As noted in the recently submitted Quarterly Monitoring Report (QMR), the Ranch Market drinking water well, DW-1, has been sampled on a monthly basis and has had very low to mostly non-detect concentrations of petroleum since January 1998. Due to the `non-potable' status of this well (excessive concentration of nitrates), the planned destruction of this well during the first quarter-2004, and a history of very low to non- detect levels of petroleum, EHD will not require continued ground water sampling and analyses for petroleum or nitrates from this well.