SITE INFORMATION AND CORRESPONDENCE_FILE 1

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Doug Westenhaver Page 2 E` On June 20 1991 the pipeline from the 10,000 gallon diesel tank from the former tank pit to the former pump island was excavated and sampled in the presence of PHS/EHD, 'Contamination was observed during the .:removal. The pipeline excavation was reportedly re-excavated to a depth of five feet on July. 9, 1991 and m August 5 1991. PHS/EHD was not present for this excavation and sampling event. This area may require confirmation sampling. "Pursuant to Section 2652(d),Article 5,Chapter 16,Title 23 of the California Code of Regulations a quarterly monitoring report shall be submitted to PHS/EHD and RWOCB until the investigation and cleanup of the site is deemed adequate.The wells at this site were last sampled in July 1990. Sampling and measuring of the four existing wells shall begin immediately. All data and measurements used to.determine gradient shall be .included with this report. If the gradient is confirmed to be to the north-northwest, the former waste oil tank -'area does not have a downgradient monitoring well in close proximity. Installation of a downgradient well will ,be required. %A workplan to define the lateral and vertical extent of soil contamination south of the former maintenance building and a quarterly monitoring report shall be submitted to PHS/EHD by February,15, 1994. The Problem Assessment Report (PAR) shall contain information that summarizes the soil data, as well as .the groundwater data, and discuss appropriate remediation alternatives. The PAR shall be submitted to PHS/EHD and RWQCB no later than April 15, 1994. If you have any questions please contact Steve Sasson, Senior.REINS, at 468-3459. Ernest M. Fujimoto, M.D. Acting Health Officer .Diane M. Hinson, Supervising R.E.H.S. Environmental Health Division cc: Elizabeth Thayer, RWQCB Bernie Sloop, American Moulding and Millworks Jeffery Bold, Dames and Moore