Laserfiche WebLink
eoloSica Technic s Znc. <br /> 2741-�iver7Zoad <br /> Modato,Cdtfomia 95351 <br /> i <br /> (M9)539- 424/gaX#538-5852 <br /> i <br /> REPORT . <br /> Groundwater Monitoring <br /> 4th Quarter 2000 <br /> �I City of Escalon <br /> Former Arco Gas Mini Mart <br /> 1350 Escalon Ave. <br /> Escalon, CA <br /> Project No. 750.2 <br /> December 27, 2000 ' <br /> j <br /> ,i <br /> 'j EXECUTIVE SUMMARY <br /> i <br /> This report summarizes the 4"' Quarter 2000 groundwater monitoring and testing event that <br /> took place at the site (see Figures 1 & 2) on December 1, 2000. This was the fourth <br /> consecutive quarterly groundwater monitoring event to take place at the facility. Two new <br /> water table wells MW-4 and MW-5, and one deep screened well MW-101 were installed on <br /> October 16 — 19, 2000. These wells were subsequently surveyed and incorporated into the <br /> current quarterly monitoring schedule. The licensed surveyor data is presented in Appendix <br /> D. <br /> j <br /> The results of analytical data indicate that detectable concentrations of the aromatic <br /> hydrocarbon compounds (BTEX) and total petroleum hydrocarbons (TPH-G) are present in <br /> three of the six monitoring wells. The presence of contamination in well MW-1 is <br /> consistent with past monitoring events. The deep well MW-101 needs further monitoring to <br /> j I determine if the contamination detected is a drilling artifact or indicative of a deeper plume. <br /> The groundwater gradient is 0.0023 ft/ft flowing N83°W. Depth to groundwater at the site <br /> was approximately 62 feet below ground surface (bgs). <br /> M i <br /> A vertical groundwater gradient calculation was made for the groundwater monitoring event <br /> and found to be in a downward direction with a slope that is approximately one order of <br /> magnitude greater then the water table horizontal gradient <br /> i <br />