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Stnte of California • I • Department of Health Services • r Ij Memorandum To Tony Landis Date. : February 20, 1987 Jeanine Jones Northern California Section Subject: Review of Lika Corp. 4250 Power Inn Road RAP Via Elgar Stephens 7-,7'` 7 1! trom Allen R. Winans �l Associate Engineering Geologist Technical Services 1219 K Street Toxic Substances Control Division 323-5868 I have reviewed the Remedial Action Plan (RAP) for Lika Corporation's Fiald Avenue Annex. I do not concur that further ground water investigation is unnecessary. It is my opinion that not enough is known of the ground water elevations, flow rates or flow directions to assess the degree or extent of contamination. i, GENERAL COMMENTS The ground water investigation for the RAP did not proceed from defining the hydrogeology to detection, then assessment of the contamination. The wells are screened throughout their lengths and were installed to detect contamination anywhere within the interval. The result is poor definition of ground water flow direction and no real data on the horizontal or vertical extent of contamination. Any contamination at one horizon will be diluted in the bull. samples. Not only can the extent of contamination not be determined, it may be increased by such wells if there is more than one aquifer. Fully screened wells cannot be used to assess pressures within individual aquifers and cannot be used to define vertical gradients. SPECIFIC COMMENTS The RAP neglects to display all the data from the described work. Steven's recorder data for MW-8 and Deep Water Channel water level data are mentioned but not displayed. It appears a sump pump may be causing the depression in water levels at the area of wells MW-8 and MW-9. Water level data does not have dates or times of measurement. Water level. data is not in tabular or contour map formats.