Laserfiche WebLink
I� <br /> -a <br /> 7-Eleven/Stockton 17 <br /> November 1990 <br /> TABLE 3 <br /> AIR STRIPPER MWA ENT VERTALS <br /> (micrograms per liter) <br /> DATE LEAD CADMIUM CHROMIUM COPPER NICKEL ZINC <br /> 7/19/90 13 ! <20 43 <40 <100 40 <br /> SUMMARY <br /> Analytical data from groundwater monitoring have documented <br /> a decrease in the water table elevation of approximately 2.19 <br /> feet during this reporting period. The groundwater gradient <br /> remains in an easterly direction. The average gradient was <br /> dWY approximately 0.0022 ft/ft during the three month period. <br /> id The results of the groundwater sampling indicate that the <br /> distribution of dissolved hydrocarbons in the groundwater beneath <br /> the site is concentrated near the former underground-tank and <br /> pump-island locations. The highest TPH-as-gasoline concen- <br /> trations was reported at 62 ppb in groundwater sample collected <br /> from recovery well RW-1. The surrounding domestic wells did not <br /> contain detectable levels of dissolved hydrocarbons during this <br /> �- reporting period. <br /> , The remediation system operated by Groundwater Technology <br /> at the site consists of a groundwater-extraction system. <br /> Groundwater was extracted from recovery well RW-1 at a rate of <br /> approximately 0.4 to 1.0 gpm during July 1990. No groundwater <br /> was extracted during the latter half of August, or during the <br /> month of September. <br /> T ,& GROUNDWATER <br /> TECHNOW(N.INC. <br />