ARCHIVED REPORTS_XR0010746 - Laserfiche WebLink

Home Browse Search

Fourth Quarter 1995 Monitonng and Sampling Report 2 . The Southland Corporation,9110 Thomton Road Stockton CA January 23 1996 Monitoring Well Sampling and Analytical Results On December 12 and 13, 1995,the following monitoring wells were sampled MW4, MW-5, MW-7, MW-8,MW-9, MW-11, MW-13,MW-14, MWA 5 (A, B, and C), MW-16, MW-17 (A, B and C), MWA 8, MW-19, MW-20,former pumping wells PW-1, PW-2 and PW-3, and former recovery well RW-1 Monitoring well MWA was inaccessible and will be sampled during the next quarterly event In March 1996 At least three well volumes of water was purged from each well (unless the well was purged dry) to ensure stabilization of pH, conductivity and temperature Wells MW-2, MW-3 and MW-10 were dry and could not be sampled Monitoring wells with sufficient water were allowed to recharge to at least 80 percent of the initial level before sampling Samples were collected from the monitoring wells using disposable bailers The samples were labeled, stored on Ice in an Insulated container, and delivered to GTEL Environmental Laboratories in Wichita, Kansas under chain-of-custody manifest The samples were analyzed for BTEX and TPH-G by Environmental Protection Agency(EPA) methods 8020/modified 8015 On December 13, 1995, approximately 515 gallons of purge water was pumped to the sanitary sewer in accordance with the Special Permit for Waste Wafer Discharge letter,dated June 5, 1995, from the City of Stockton, Department of Municipal Utilities Analytical results for groundwater samples collected on December 12 and 13, 1995, are summarized in Table 1 No TPH-G was detected in any of the monitoring wells sampled Benzene was detected only in the groundwater sample from well MW4 at a concentration of 0 6 parts per billion (ppb) A copy of the laboratory analytical report and the chain-of-custody manifest are included in Attachment 4 The site is currently being considered for closure by the California Regional Water Quality Control Board-Central Valley Region (CRWQCB-CVR), and the San Joaquin County Public Health Services (SJCPHS) 1 GROUNIANINT)E;R Q133046 rpuSw'-6 1) ❑L�� TECHNOLOGY