COMPLIANCE INFO - Laserfiche WebLink

Home Browse Search

San Joaquin County EHD December 7, 2005 Page 2 of 5 Cleaning and Removal of Septic Tank The contents of the septic system were pumped into a 1,200-gallon tank for storage on site. The septic tank was triple rinsed and pressure washed. All wash water was transferred to the storage tank. Ground Zero collected a water sample from the storage tank on October 21, 2004. Appropriate containers were delivered under chain of custody protocol to Argon Laboratories in Ceres, California and Alturas Analytics, Inc. of Moscow, Idaho. Samples submitted to Argon were analyzed for total petroleum hydrocarbons as gasoline (TPHg) using EPA Method 8015B, benzene, toluene, ethylbenzene, and xylenes (BTEX) using EPA 8021B, and volitile organic compounds (VOCs), expanded to include acetone, by EPA 8260. Samples submitted to Alturas were analyzed for methamphetamines by HPLC/MS/MS, total phosphorus by SM 4500 PF, iodide and chloride by EPA 300.0, and pH by EPA 150.1. The wastewater sample contained elevated levels of VOCs, inlcuding TPI-Ig at 2,800 micrograms per liter(gg/L), benzene at 6.3 gg/L, and chloroform at 230 gg/L, all of which are above drinking water standards, but below hazardous waste thresholds. Methamphetamine was detected at 0.26 micrograms per milliliter (gg/ml), but no drinking water standard has been developed for methamphetamine. Analytical results are summarized in Table 1. During a site inspection to mark the drilling locations for clearance by Underground Service Alert (USA)prior to additional investigation, it was discovered that the property owner had removed the septic tank. According to Mr. Van Spronsen the septic tank was removed but no additional soil was excavated. According to Mr. Van Spronsen the septic tank was transported to Modesto Sand & Gravel for disposal along with other concrete debris. A septic tank closure permit application and associated fee was submitted to EHD on May 17, 2005. A declaration from Mr. Robert Van Spronsen summarizing removal and disposal activities is included in Attachment 1. Soil Investigation On April 8, 2005 Ground Zero Analysis, Inc. (Ground Zero) performed a subsurface investigation at the subject site. The investigation was conducted at the request of and under the direction of EHD. Since the property owner had removed the septic tank(see above)no soil borings were advanced at the site. Instead, soil samples were collected at the location of the former septic tank and beneath the leach lines. At the request of Ground Zero and EHD, Mr. David Van Spronsen used a backhoe to expose the leach lines to allow the collection of soil samples at selected locations. No leach pits were identified at the ends of the leach lines. Mr. Van Spronsen indicated that leach pits could not be installed due to the presence of hard pan at a depth of approximately 5 to 6 feet bgs. In addition, G:\GROUNDZE\Berberian\sum—closure.doc