SITE INFORMATION AND CORRESPONDENCE

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ENVIRONMENTAL HEALTH DEPARTMENT SAN JOAQUIN COUNTY >•---•.+�-'-9� - Unit Supervisors Donna K.Heran,R.E.H.S. Carl Bor man,R.E.H.S. Director 304 East Weber Avenue, Third Floor g Mike Huggins,R.E.H.S.,R.D.I. Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. o Program Manager a .-. .....�; g g Telephone: (209) 46$-3420 Margaret Lagorio,R.E.H.S. Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. Program Manage, Fax: (209) 464-01.38 Mark Barcellos,R.E.H.S. MICHAEL KARVELOT [AUG 2 d ZMA QUIK STOP MARKETS INC 4567 ENTERPRISE STREET FREMONT CA 94538 RE: Quik Stop Station No. 76 SITE CODE 887 1030 South Olive Avenue RO: 887 Stockton, CA 95215 San Joaquin County Environmental Health Department (EHD) personal was present for installation of monitoring well MW-1 on July 3, 2003. While grouting the borehole, the casing cap popped off and grout entered the well casing of MW-1. Now, after four groundwater-monitoring events, it appears that the integrity of MW-1 was compromised during the well installation. This is based on the following information: • During the July 11, 2003, monitoring event pH readings were quite high, ranging from 11.97 to 12.26,,and during the June 10, 2004, monitoring event the pH readings ranged from 11.61 to 11.77. These high pH readings are an indication that cement in the well is affecting the water chemistry. • During the sampling event on June 10, 2004, the field technician was able to purge approximately one gallon of groundwater from MW-1 when approximately three gallons should have been purged. The field technician also noted that the groundwater smelled like concrete. • During the groundwater-sampling event on August 20, 2004, the EnviroTech 24- volt four-stage pump was only able to purge approximately 0.5 gallons of water from the well. The field technician noted that there might be an obstruction that prevented the pump and disposable bailer from reaching the well bottom. Also, the well took approximately an hour to recharge to eighty percent and only one reading was taken for pH and conductivity. The temperature reading was not reported because the field technician felt the high reading was inaccurate. Therefore, the monitoring well at this site must be properly destroyed and replaced. Submit a work plan to destroy the well, an EHD permit application, and $60 permit fee to EHD by September 30, 2004. Please note that monitoring wells in areas of contamination may only be destroyed by removing all of the well contents by drilling out the original borehole and filling the borehole with grout. The monitoring well must be replaced with a new well that meets current well construction standards.