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COUNTY OF SAN JOA UI THOMAS R.FLINN DEPARTMENT OF PUBLIC WORKS DEPUTY DIRECTOR to: X P.O.BOX 1810-1810 E.HAZELTON AVENUE 'STEVEN WINKLER % STOCKTON,CALIFORNIA 95201-1810 DEPUTY DIRECTOR 209/468-3000 FAX:209/468-2999 01, 2 AN 11: 1 1 MANUEL LOPEZ DIRECTOR June 21, 2000 Wendy Arano California Regional Water Quality Control Board 3443 Routier Road, Suite A Sacramento, California 95827 SUBJECT: FOOTIULL SANITARY LANDFILL MONITORING RESULTS Dear Ms. Arano: We received y6ur letter dated May 25, 2000, regarding monitoring results at the Foothill Sanitary Landfill. The issues discussed in the letters are addressed below. Issue: Monitoring well MW-2 was slow to recharge, and samples were taken three weeks later than in the other two wells. This time gap is not acceptable. Response: Water levels indicate that only about three feet of water exists in MW-2, and the well did not respond quickly enough to sample on the same day as purging. The long gap in sampling during the fourth quarter was partially due to the large quantity of sample required to analyze for 5-year Constituents of Concern. Although the well is consistently slow to recharge, it is usually sufficient for quarterly sample quantities. Therefore, we request that we continue monitoring the well normally until the end of the calendar year. At that time, we can re-visit the adequacy of the well. During the first and second quarters of 2000, the well produced adequately for sampling in a reasonable time frame. Issue: Phenol, a 5 year Constituent of Concern, was detected at a trace amount in MW-2 during the fourth quarter. A re-test was requested for phenol. Response: Standard Provisions and Reporting Requirements dated 1993, p. 12, state that a discrete re-test is required when two or more VOCs are detected above the Method Detection Limit (MDL) and below the Practical Quantitative Limit(PQL) in one well during the same monitoring event. The County did not consider the single trace detection to be tentative evidence of a release, so it was not re-sampled. Issue: There was a trace detection of trichloroethene in MW-3 during the fourth quarter monitoring event. It was requested that the County re-test for this parameter.