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r <br /> c'3 d.uVISIQI2 Of <br /> ENVIRONMENTAL SOLUTIONS cmc®n <br /> May 13 1999 <br /> Y 21 1999 Project 20805-140 010 <br /> Elfdih,, ENT,,% r, j�LT' , <br /> Ms Lori Duncan <br /> FERMI r/SERV1CkrS <br /> San Joaquin County Public Health Services <br /> Environmental Health Department <br /> 304 East Weber, Third Floor <br /> P O Box 388 <br /> Stockton, California 95201 <br /> Re Vapor Extraction and Aar Sparge Well Installation Report at the former ARCO <br /> Products Company Service Station No 548, Located at 1612 West Hammer Lane, <br /> Stockton, California <br /> Dear Ms Duncan <br /> Pinnacle Environmental Solutions. a division of EMCON (Pinnacle), is providing this <br /> report of the recent installation of a dual completion vapor extraction well and three air <br /> sparge wells at the former ARCO Products Company Service Station No 548, located at <br /> (� 1612 West Hammer Lane, Stockton, California Drilling and installation activities were <br /> conducted under the direction of a California-registered geologist from October 26, 1998 <br /> to October 28, 1998, consistent with the scope of work presented in the Pinnacle <br /> workplan dated August 10, 1998 <br /> BACKGROUND <br /> Representatives of the Stockton Fire Department (SFD), SJCPHS, and Pinnacle observed <br /> UST removal on February 10, 1998 The gasoline UST complex consisted of two 4,000- <br /> gallon and one 5,000-gallon single-wall fiberglass-coated steel tanks, and one 10,000- <br /> gallon single-wall fiberglass tank The 10,000 gallon UST formerly stored leaded <br /> gasoline The gasoline UST fill ports were located at the northern ends of the tanks <br /> Fiberglass piping located at the northern ends of the USTs connected the USTs to two <br /> dispenser islands located north of the station building One 280-gallon waste-oil tank <br /> was located west of the gasoline UST complex (see Figure 2) <br /> Previous Investigations <br /> From December 1990 through November 1993, RESNA Industries, Inc (RESNA <br /> [formerly Applied GeoSystems]) of Rancho Cordova, California, observed the drilling of <br /> 21 borings (B-1 through B-21), and the installation of five on-site groundwater <br /> monitoring wells (MW-1 through MW-5), one off-site groundwater monitoring wLII <br /> CP\E 1ARCO\0548\REPORTS\0548P201 DOC 98\lsg 1 <br /> 3939 Cambridge Road Suite 220 Cameron Park California 95682 (530)676 6884 (530)676-6885 Fax <br />