Laserfiche WebLink
S <br /> July 28, 1988 AGS Job No. 38012-2 <br /> Former UNOCAL Service Station, Stockton, California <br /> above the perforated casing. A 1- to 2-foot-thick bentonite plug <br /> was placed above the sand as a seal against cement entering the <br /> sand pack. The remaining annulus was backfilled with neat nement <br /> to grade. A cast-aluminum utility box with a PVC apron was <br /> placed over each well head and set in concrete flush with the <br /> surrounding station pad. This box has a watertight seal to <br /> protect against surface-water infiltration and requires a <br /> specially designed wrench to open. This design discourages <br /> vandalism and reduces the possibility of accidental disturbance <br /> 1 , y <br /> of the well. Each well head was also fitted with a locking steel <br /> cage to protect further against unauthorized disturbance of the <br /> well. <br /> GROUND-MATER SAIAPLING <br /> Following initial water-level measurements, the wells were <br /> developed by pumping and surging. A clean Teflon bailer was used <br /> first to obtain a sample from the surface of the water in the <br /> well prior to purging. Any subjective evidence of product <br /> detected in the wells was recorded. No Floating product or sheen <br /> was observed on water from any of the wells. Prior to sampling, <br /> --- -- ---- - --- - -- <br /> approximately-three-we l-1--volumes-oF---water-.(45-_ta.._5o_.gai.Zons)-_were._ -__-- -- ------ ____-- ----__- --- <br /> purged from each well using a submersible air-lift pump.. Water <br /> 12 <br /> APPIied GeoSyete17s <br />