CORRESPONDENCE_1971-1981 - Laserfiche WebLink

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0 July 20, 1981 Project 116-1,3 -2- Additional industrial wastes consisting of wet -solid sludges were accepted for disposal in the .Group l Trench Landfill Arca and were placed in Trench #3. Liquid *as1es consisting of drilling mud and gas -well brines were disposed in Evaporation pond #2. Table 2 below, provides volume data on all Group l waste approved for disposal in Landfill Trench #3 and Evaporation Pond #2. Group 1 sludge wastes placed in Disposal Trench #3 are covered, when possible, on a daily basis with a minimum 6 inch thickness of clean earth as requested by representatives of the California Department of Health Services. TOTAL 9,234 n. 68O 14,457 Landfill trenches in the Group 1 disposal area are checked each quarter for the presence of water in the leachate collection sump. During the second Quarter Monitoring period, all trench sumps have remained dry. As previously indicated, regional decline in groundwater level has caused Munituring Wells #l, #2 and #3 to go dry, Monitoring Wells A, #5 and #6 were installed to a depth of 401, and have always been dry. Groundwater samples were collected from Monitoring Wells #7 and #g on July 15, 1980. Prior to sampling, each well was balled to remove a volume of water equal to the well volume. The sample was than collected and fltered through a #42 Whatman Filter Paper to remove suspended sol|ds. The sample wa*s,then split and half of each sample was fixed with nitric acid to preserve for metal ions. These sampling methods and subsequent analyses are in conformance with "Standard Methods for the Examination of Water and Wastewater." Analyses were performed by Emcon Associates of San Jose, California, a water labora- tory certified by the California Department of Health Serv|ces, Table 3 summarizes all groundwater observations and analyses at Monitoring Wells #7 and #9. TABLE 2 - CROUP 1 WASTE FMC Proctor Gamble Drilling Mud Brine - Month April 1981 4,142 60 680 4,823 May 1981 3,972 4O 0 6,857 June 1981 1,120 80 O 4,777 TOTAL 9,234 n. 68O 14,457 Landfill trenches in the Group 1 disposal area are checked each quarter for the presence of water in the leachate collection sump. During the second Quarter Monitoring period, all trench sumps have remained dry. As previously indicated, regional decline in groundwater level has caused Munituring Wells #l, #2 and #3 to go dry, Monitoring Wells A, #5 and #6 were installed to a depth of 401, and have always been dry. Groundwater samples were collected from Monitoring Wells #7 and #g on July 15, 1980. Prior to sampling, each well was balled to remove a volume of water equal to the well volume. The sample was than collected and fltered through a #42 Whatman Filter Paper to remove suspended sol|ds. The sample wa*s,then split and half of each sample was fixed with nitric acid to preserve for metal ions. These sampling methods and subsequent analyses are in conformance with "Standard Methods for the Examination of Water and Wastewater." Analyses were performed by Emcon Associates of San Jose, California, a water labora- tory certified by the California Department of Health Serv|ces, Table 3 summarizes all groundwater observations and analyses at Monitoring Wells #7 and #9.