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Boyett Petrol CUM(419 Site tfistory conducted on foot and residents were contacted b S•Main st.,Manteca) and apartments) doors and inquiring of the owner/renter. Page�of 11 identified either b Y knocking on residential (houses identified within the study area. No D The actual and , duplexewellslwere ker or Y a neighbor living within the SRS area T 1 locations of wells were the 2002 sensitive receptor survey WR Fell records were available for two of the three Street. When asked, the owner indicat hree well locations were Y for the site vicinity, a well was thought to be locatedatwells. During at 123 ed there was no well. During the SRS reconnaissance18$ W. Oak W Stockton Street indicated that a well at this Oak Scree was located at 144 W, Wetmore Street Burin from t location was used b , the resident the property owner to sample the wellg the 2003 SRS reconnaissance. Condor requested its owner. 123 W. Stockton Street, there at this location. Based on conversa#ions with `� well These wells are may be several irrx improperly erl quested permission the site. Potentia] vertical conduits far hydrocarbon contaminants in th the resident at p P y abandoned wells within the residential area. groundwater in the vicinity of On July 15, 2003, a Condor re monitoring wells MW-1 presentative was onsite to collect water level measurements monitarin 1 through MW-3 and MW_ Pum g well MW_g by surging and pumping theough MW- Attempts were and redevelop P This redevelopment g groundwater in the well with a surge Procedure was ineffective due to large volumes of medium_ rounded, and well-sorted sand infiltrating the well feet in the measured total depth o f MW- g lock and The infiltration of sand resulted in a decrease of 0.(0 cleared Burin r 9 The water grained, well cleared l; edevelopment. Heavy amounts of ater'and Purged from MW_g on the results of the redevelopment Periodically interfered 9 s fight brown in color and MW-5 to sand infiltration Pment procedure a weIIs, the decision �, and the historic applied to MW-9, the previous loss of equipment. high sediment content observed in all MW-4 and as made not to surge or determined even if r Pump the rema- - the site . measurements collected �om the is to s successful 9 monitoring mini#wring the potentia] benefits wou d be limited addition, it was feet of water. monitoring wells indicated the wells contained as water level A provisional increase in the only two to three water levels in monitorin N, groundwater monitoring frequent monthly basis and g ells tt�IW_1 through M�fI.3 and MW-6 was instituted in July 2003 in which six consecutive months. q July 2dwater 2 003,valCbe olIected for throw h g MW-9 will be measured oPeriodn a and collect groundwater sam MTBE laboratory analysis for a or representative was on site to measure water eve in f groundwater samples collected at the s Ceson ltd monitoring groundwater samples collected from g Wells' Laboratory analytical results for the MW`l Y 22, 2043, indicated that MTBE was detected in the collected on July 22, 2003 , MW-2, MW-7 with that reported in the Se pY1d rally indicated a , and MW_g. Static water level measurement, the average Quarter A, flow direction to the southwest, consistent g groundwater ll�fonitoring Report June 2003 monitoring event by 1 A6 feet elevation (14.32 feet) decreased with respect 30 2003. In addition, On Augustp the previous quarterly d, 2003, Condor collected a w Manteca, California. Laboratoryiter sample from the well located at 144 West BTEX, and gasoline ox analytical results of the limits. Ygenates/additives were not detected at or above the lobo Wetmore Street, groundwater sample indicated that TPI3_G laboratory reported detection On August 19, 2003, a samples at monitorin Condor representative was on site to and MW- g wells MW-1 throweasure water levels and collect groundwater August they were AlMW-9• site samples were not collected from the site on Au �Y• Laboratory analytical results for the from gust 19, 2003, indicated that groundwater samples collected at MW-1, MW-2, MW-7, and MW` MTBE was detected in the 9 Static water leve] groundwater samples collected measurements generally indicated a