Laserfiche WebLink
ti <br /> CLEARWATER <br /> G R O U P, I N C <br /> Environmental Services <br /> 0 <br /> QUARTERLY GROUNDWATER MONITORING REPORT <br /> FIRST QUARTER 1998 <br /> Ruiz Grocery, <br /> 4491 West Durham Ferry Road,Tracy, CA <br /> CGI Project D-107 <br /> February 12, 1998 <br /> BACKGROUND <br /> Two gasoline USTs and dispensers were removed from the site in 1988 Seven monitoring wells (MW-1 through <br /> MW-7),one groundwater recovery well (RW-1), four soil vapor extraction wells (VW-1 through VW-4), and two air <br /> sparge wells (SW-1 and SW-2) have been installed at the site A domestic well (DW), screened in a deeper water <br /> bearing zone, has also been installed at the site The extent of soil and water contamination has been delineated <br /> Pilot testing has been completed and a remedial action plan prepared based on results <br /> The work presented here was conducted as part of scheduled quarterly groundwater monitoring as requested by the San <br /> Joaquin County Public Health Services/Environmental Health Division (SJCPHS/EHD) All work was conducted <br /> in accordance with Clearwater's Field Procedures attached <br /> GROUNDWATER MONITORING FIELD ACTIVITIES <br /> Date of field activities 1/22/98 <br /> Wells monitored/sampled MW-I to MW-7 and the domestic well(DW) <br /> Analytes tested TPHg,BTEX,and MTBE <br /> Analytical methods EPA Methods 8015/8020(modified) <br /> Laboratory American Environmental Network,Inc of Pleasant Hill,CA <br /> Remarks None <br /> GROUNDWATER MONITORING RESULTS <br /> Depth to water 15 78 to 17 23 feet below ground surface(bgs) <br /> Flow direction/gradient Overall, northeast at 0 002 ft/ft <br /> SPH- welWthicknesses Sheen in MW-1 and MW-2 <br /> TPHg concentration range <100µg/L (DW, MW-3, 5, 6, and 7) to 64,100 µg/L (MW-1) <br /> Benzene concentration range <0 5 µg/L(DW,MW-3, 5, 6, and 7) to 1,700 µg/L (MW-2) <br /> MTBE concentration range <5 0 µg/L (DW, MW-3, 6) to 1,300 Ftg/L (MW-2) <br /> Remarks v Slightly convergent flow pattern in vicinity of site Flow direction is consistent <br /> with those typically observed at the site (from northwest to northeast) <br /> Hydrocarbon contamination was not detected in the domestic well <br /> PROJECT STATUS <br /> On behalf of Ruiz Grocery,Clearwater has received cost pre-approval(dated January 21, 1998)from the Underground <br /> Storage Tank Clean-up Fund for tasks associated with installation, start-up, operation and maintenance of the air <br /> sparging / vapor extraction remediation system, and for four quarters of quarterly groundwater monitoring and <br /> reporting Remediation system installation is currently being implemented and the system is expected to be <br /> operational by the end of the first quarter of 1998 <br /> 520 Third Street,Suite 104 " Oakland,California 94607 o Telephone 510-893-5160 o Fax 510-893-5947 <br />