WORK PLANS - Laserfiche WebLink

Home Browse Search

Stockton Propeller Sampling and Analysis Plan 2 Background 2.1 Site History There are five addresses previously associated with this complex: 2120 Wilcox Road, 2310 Wilcox Road, 4349 Wilcox Road, 4610 Wilcox Road, and 2470 North Wilcox Road.There are currently three residences at the site-one on the south end of the property, and the other two just north of SPI.To the south of SPI are Formurex, an autobody shop, a gym, a towing company, and a single residence.The interconnectivity, if any, of septic systems between properties near or adjacent to SPI is unknown at this time. SPI occupies two buildings on the property: the main SPI building and the SPI warehouse.The main SPI building is connected to the septic tank adjacent to the south wall of the building. Refer to Figure 2.The SPI warehouse contains no bathrooms or drains and does not appear to be connected to any septic tanks on the property. In the 1970s the property was used exclusively for industrial purposes and was originally occupied by Wilcox Manufacturing. Wilcox Manufacturing manufactured machinery and performed metal finishing, metal working, and painting. Following Wilcox Manufacturing, Cal Cedar Products occupied the property, and during this period Duraflame logs were manufactured at the site. In addition to the manufacturing of the Duraflame logs, Cal Cedar Products carbon-tipped their saw blades, which required acid etching. Cal Cedar Products also utilized various chemicals to manufacture various types of logs, burning colors, and effects. SPI has occupied 2478 Wilcox Road since October 2005.The facility currently occupied by SPI is the shop in which Cal Cedar Products performed the carbon-tipping of saw blades. When SPI took over the facility,the shop was equipped with an etch sink connected to the septic tank, and an exhaust fan, which had been installed and utilized by Cal Cedar Products. SPI utilized the existing equipment within its etch room until May 2021, but has since removed the sink from the etch room. On May 18, 2021, during an interview conducted by the SJCEHD, Mr. Mike Belmont, SPI Service Manager, stated that the Site disposes of Ardrox 985 P14 (penetrant primarily consisting of petroleum distillates and aromatic hydrocarbons), NuEtch E3 (potassium hydroxide), and DeSmut NS3 (sulfuric and nitric acid)wastewater, as well as spent NuEtch E3 and DeSmut NS3 solutions to the on-Site septic system. Mr. Belmont also stated that SPI discharges five (5) gallons a day of industrial wastewater to the septic system. However, after the interview, SPI was directed to cease disposing of the Ardrox, NuEtch and DeSmut rinse waters into the septic tank.Accordingly, on May 19, 2021, or shortly thereafter, SPI discontinued pumping and draining those rinse waters into the septic tank and the etch room utility sink was removed and the drain covered.The location of rooms within the SPI facility is presented in Figure 3. On November 18, 2021, Central Valley Water Board were told by Mr. Belmont that approximately five (5)gallons of SPIs wastewater was disposed of into the septic system per day from 2005 to May 2021 (approximately 16 years). 2.2 Septic Tanks There is no record of when the septic systems were last pumped out. According to SPI records,the depth of the septic system contents ranges from 3.5 to 5 feet deep. On or about December 14, 2021,the depth was measured at 1 foot.The reason for this drop may have been as a result of a septic pumping service unknown to SPI.The depth has since returned to its normal range. On December 20, 2021,Tim Wong, Stockton Propeller EHS Technician, collected 2 composite samples from the septic tank outside SPI's Main Building. Wong removed the ground level and septic tank lids for what are believed to be two compartments within the one septic tank. He then measured and recorded the depth of the waste in each compartment with a staff gauge made from PVC pipe with depth Blankinship&Associates, Inc. Page 5 of 20 September 23, 2022 NES, Inc.